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Aguilera-Granja F, Ayuela A. Low density phases of TiO 2 by cluster self-assembly. Sci Rep 2024; 14:12491. [PMID: 38821967 PMCID: PMC11143274 DOI: 10.1038/s41598-024-61943-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2024] [Accepted: 05/12/2024] [Indexed: 06/02/2024] Open
Abstract
The interest in titanium dioxide (TiO2 ) phases is growing due to the number of applications in cosmetics, food industry and photocatalysis, an increase that is driven by its exceptional properties when engineered at the nanoscale like in the form of nanoparticles. Our goal is to discover unknown low-density phases of TiO2 , with potential for applications in various fields. We then use well-known TiO2 clusters as fundamental building blocks to be self-assembled into unique structures to study their distinct characteristics. Density functional calculations are employed to relax the structures and identify the most stable TiO2 structures within an energy range of 0.1 eV per atom from the rutile and anatase phases, which are confirmed, validating our methodology. Going beyond conventional phases, we found two-dimensional TiO2 structures, previously explored in separate studies, and showing typical structures of transition metal dichalcogenide layers, that forge a bridge between different TiO2 structures. It is noteworthy that our investigation uncovered an entirely novel class of TiO2 structures featuring hexagonal cages like beehive channels, opening novel phases with huge potential. These discovered low-density phases are interesting, particularly the hexagonal cage structures with remarkable large gaps, because they introduce other dimensions for uncharted applications in the ever-growing TiO2 landscape.
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Affiliation(s)
- Faustino Aguilera-Granja
- Instituto de Física, Universidad Autónoma de San Luis Potosí, 78000, San Luis Potosí, Mexico
- Centro de Física de Materiales-CFM-MPC, Donostia International Physics Center DIPC, Paseo Manuel de Lardizabal 5, 20018, San Sebastián, Spain
| | - Andres Ayuela
- Centro de Física de Materiales-CFM-MPC, Donostia International Physics Center DIPC, Paseo Manuel de Lardizabal 5, 20018, San Sebastián, Spain.
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2
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Wang F, Yue L, Li Q, Liu B. Electron Microscope Study of the Pressure-Induced Phase Transformation and Microstructure Change of TiO 2 Nanocrystals. J Phys Chem Lett 2024; 15:2233-2240. [PMID: 38377180 DOI: 10.1021/acs.jpclett.3c03643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
Microstructure transformation of materials under compression is crucial to understanding their high-pressure phase transformation. However, direct observation of the microstructure of compressive materials is a considerable challenge, which impedes the understanding of the relations among phase transformation, microstructure, and material properties. In this study, we used transmission Kikuchi diffraction and transmission electron microscopy to intuitively characterize pressure-induced phase transformation and microstructure of TiO2. We observed the changes of twin boundaries with increasing pressure and intermediate phase TiO2-I of anatase transformed into TiO2-II (α-PbO2 phase) for the first time. The following changes occur during this transformation: anatase (diameter of ∼100 nm) → anatase twins 60° along the [110] zone axis → intermediate TiO2-I twins 60° along the [010] zone axis → TiO2-II twins 90° along the [010] zone axis. These results directly reveal the crystallographic relation among these structures, enhancing our understanding of the phase transformation in TiO2 nanocrystals.
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Affiliation(s)
- Fei Wang
- State Key Laboratory of Superhard Materials, Jilin University, Changchun, Jilin 130012, People's Republic of China
| | - Lei Yue
- State Key Laboratory of Superhard Materials, Jilin University, Changchun, Jilin 130012, People's Republic of China
| | - Quanjun Li
- State Key Laboratory of Superhard Materials, Jilin University, Changchun, Jilin 130012, People's Republic of China
| | - Bingbing Liu
- State Key Laboratory of Superhard Materials, Jilin University, Changchun, Jilin 130012, People's Republic of China
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3
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Hussain A, Rauf A, Ahmed E, Khan MS, Mian SA, Jang J. Modulating Optoelectronic and Elastic Properties of Anatase TiO2 for Photoelectrochemical Water Splitting. Molecules 2023; 28:molecules28073252. [PMID: 37050015 PMCID: PMC10096401 DOI: 10.3390/molecules28073252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 04/03/2023] [Accepted: 04/03/2023] [Indexed: 04/09/2023] Open
Abstract
Titanium dioxide (TiO2) has been investigated for solar-energy-driven photoelectrical water splitting due to its suitable band gap, abundance, cost savings, environmental friendliness, and chemical stability. However, its poor conductivity, weak light absorption, and large indirect bandgap (3.2 eV) has limited its application in water splitting. In this study, we precisely targeted these limitations using first-principle techniques. TiO2 only absorbs near-ultraviolet radiation; therefore, the substitution (2.1%) of Ag, Fe, and Co in TiO2 significantly altered its physical properties and shifted the bandgap from the ultraviolet to the visible region. Cobalt (Co) substitution in TiO2 resulted in high absorption and photoconductivity and a low bandgap energy suitable for the reduction in water without the need for external energy. The calculated elastic properties of Co-doped TiO2 indicate the ductile nature of the material with a strong average bond strength. Co-doped TiO2 exhibited fewer microcracks with a mechanically stable composition.
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Affiliation(s)
- Akbar Hussain
- Department of Physics, University of Peshawar, Peshawar 25120, Pakistan
| | - Abdur Rauf
- Department of Physics, University of Peshawar, Peshawar 25120, Pakistan
| | - Ejaz Ahmed
- Department of Physics, Abdul Wali Khan University, Mardan 23200, Pakistan
| | - Muhammad Saleem Khan
- Department of Chemical Engineering, NFC Institute of Engineering & Technology, Multan 60000, Pakistan
| | | | - Joonkyung Jang
- Department of Nano Energy Engineering, Pusan National University, Busan 46241, Republic of Korea
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4
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Miao Y, Zhao Y, Zhang S, Shi R, Zhang T. Strain Engineering: A Boosting Strategy for Photocatalysis. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2200868. [PMID: 35304927 DOI: 10.1002/adma.202200868] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 03/02/2022] [Indexed: 06/14/2023]
Abstract
Whilst the photocatalytic technique is considered to be one of the most significant routes to address the energy crisis and global environmental challenges, the solar-to-chemical conversion efficiency is still far from satisfying practical industrial requirements, which can be traced to the suboptimal bandgap and electronic structure of photocatalysts. Strain engineering is a universal scheme that can finely tailor the bandgap and electronic structure of materials, hence supplying a novel avenue to boost their photocatalytic performance. Accordingly, to explore promising directions for certain breakthroughs in strained photocatalysts, an overview on the recent advances of strain engineering from the basics of strain effect, creations of strained materials, as well as characterizations and simulations of strain level is provided. Besides, the potential applications of strain engineering in photocatalysis are summarized, and a vision for the future controllable-electronic-structure photocatalysts by strain engineering is also given. Finally, perspectives on the challenges for future strain-promoted photocatalysis are discussed, placing emphasis on the creation and decoupling of strain effect, and the modification of theoretical frameworks.
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Affiliation(s)
- Yingxuan Miao
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Yunxuan Zhao
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Shuai Zhang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Run Shi
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Tierui Zhang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
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5
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6
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Zhang W, Zhang J, Zeng Y, Lin W, Liu L, Guan S, Zhang Z, Guo H, Peng F, Liang H. Pressure-Induced Phase Transition and Compression Properties of HfO 2 Nanocrystals. Inorg Chem 2022; 61:3498-3507. [PMID: 35175752 DOI: 10.1021/acs.inorgchem.1c03450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Nanoparticles exhibit unique properties due to their surface effects and small size, and their behavior at high pressures has attracted widespread attention in recent years. Herein, a series of in situ high-pressure X-ray diffraction measurements with a synchrotron radiation source and Raman scattering have been performed on HfO2 nanocrystals (NC-HfO2) with different grain sizes using a symmetric diamond anvil cell at ambient temperature. The experimental data reveal that the structural stability, phase transition behavior, and equation of state for HfO2 have an interesting size effect under high pressure. NC-HfO2 quenched to normal pressure is characterized by transmission electron microscopy to determine the changing behavior of grain size during phase transition. We found that the rotation of the nanocrystalline HfO2 grains causes a large strain, resulting in the retention of part of an orthorhombic I (OI) phase in the sample quenched to atmospheric pressure. Furthermore, the physical mechanism of the phase transition of NC-HfO2 under high pressure can be well explained by the first-principles calculations. The calculations demonstrate that NC-HfO2 has a strong surface effect, that is, the surface energy and surface stress can stabilize the structures. These studies may offer new insights into the understanding of the physical behavior of nanocrystal materials under high pressure and provide practical guidance for their realization in industrial applications.
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Affiliation(s)
- Wei Zhang
- School of Science, Southwest University of Science and Technology, Mianyang 621010, P. R. China
| | - Jiawei Zhang
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, P. R. China
| | - Yingying Zeng
- School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, P. R. China
| | - Weitong Lin
- Department of Mechanical Engineering, City University of Hong Kong, Kowloon 999077, Hong Kong, P. R China
| | - Lei Liu
- School of Science, Southwest University of Science and Technology, Mianyang 621010, P. R. China
| | - Shixue Guan
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, P. R. China
| | - Zhengang Zhang
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, P. R. China
| | - Huazhong Guo
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, P. R. China
| | - Fang Peng
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, P. R. China
| | - Hao Liang
- School of Science, Southwest University of Science and Technology, Mianyang 621010, P. R. China
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7
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Yi R, Wang J, Yue X, Liang Y, Li Z, Sheng H, Guan M, Zhu Y, Sun Q, Wang L, Huang X, Lu G. Synthesis of Thin Bi 9 O 7.5 S 6 Nanosheets for Improved Photodetection in a Wide Wavelength Range. Chem Asian J 2021; 16:3748-3753. [PMID: 34549536 DOI: 10.1002/asia.202100963] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/17/2021] [Indexed: 12/30/2022]
Abstract
Bismuth-based compounds possess layered structures with a variety of stacking modes, endowing the compounds with diverse properties. As one type of bismuth oxysulfides, Bi9 O7.5 S6 nanocrystals has great applications in photodetection; however, the responsivity of bulky Bi9 O7.5 S6 is limited due to the poor charge separation. Herein, single-crystalline Bi9 O7.5 S6 thin nanosheets are successfully synthesized by using a solvothermal method. The thickness of the obtained Bi9 O7.5 S6 nanosheets is down to 15 nm and can be easily tuned by varying the reaction period. Moreover, the Bi9 O7.5 S6 nanosheets show strong light absorption in the visible and near infrared range, making it a promising candidate in optoelectronics. As a demonstration, the thin Bi9 O7.5 S6 nanosheets are used as active layer in an optoelectronic device, which exhibits sensitive photoelectric response to light in a wide range of 400-800 nm. The responsivity of the device reaches up to 1140 μA W-1 , and the performance of the device is stable after long-period illumination. This work demonstrates a great potential of the thin Bi9 O7.5 S6 nanosheets in optoelectronic devices, and these nanosheets may also be extended to various optoelectronic applications.
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Affiliation(s)
- Ronghua Yi
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, P. R. China
| | - Jin Wang
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, P. R. China
| | - Xiaoping Yue
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, P. R. China
| | - Yan Liang
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, P. R. China
| | - Zhuoyao Li
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, P. R. China
| | - Huixiang Sheng
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, P. R. China
| | - Mengdan Guan
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, P. R. China
| | - Yameng Zhu
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, P. R. China
| | - Qizeng Sun
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, P. R. China
| | - Li Wang
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, P. R. China
| | - Xiao Huang
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, P. R. China
| | - Gang Lu
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, P. R. China.,National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, P. R. China
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8
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Chai ZM, Wang BH, Tan YX, Bai ZJ, Pan JB, Chen L, Shen S, Guo JK, Xie TL, Au CT, Yin SF. Enhanced Photocatalytic Activity for Selective Oxidation of Toluene over Cubic–Hexagonal CdS Phase Junctions. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c01505] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhao-Ming Chai
- Advanced Catalytic Engineering Research Center of the Ministry of Education, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, P. R. China
| | - Bing-Hao Wang
- Advanced Catalytic Engineering Research Center of the Ministry of Education, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, P. R. China
| | - Yu-Xuan Tan
- Advanced Catalytic Engineering Research Center of the Ministry of Education, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, P. R. China
| | - Zhang-Jun Bai
- Advanced Catalytic Engineering Research Center of the Ministry of Education, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, P. R. China
| | - Jin-Bo Pan
- Advanced Catalytic Engineering Research Center of the Ministry of Education, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, P. R. China
| | - Lang Chen
- Advanced Catalytic Engineering Research Center of the Ministry of Education, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, P. R. China
| | - Sheng Shen
- Advanced Catalytic Engineering Research Center of the Ministry of Education, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, P. R. China
| | - Jun-Kang Guo
- Advanced Catalytic Engineering Research Center of the Ministry of Education, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, P. R. China
| | - Ting-Liang Xie
- Advanced Catalytic Engineering Research Center of the Ministry of Education, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, P. R. China
| | - Chak-Tong Au
- College of Chemical Engineering, Fuzhou University, Fuzhou 350002, Fujian, P. R. China
| | - Shuang-Feng Yin
- Advanced Catalytic Engineering Research Center of the Ministry of Education, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, P. R. China
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Luo H, Guo S, Zhang Y, Bu K, Lin H, Wang Y, Yin Y, Zhang D, Jin S, Zhang W, Yang W, Ma B, Lü X. Regulating Exciton-Phonon Coupling to Achieve a Near-Unity Photoluminescence Quantum Yield in One-Dimensional Hybrid Metal Halides. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2100786. [PMID: 34021734 PMCID: PMC8292847 DOI: 10.1002/advs.202100786] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 03/19/2021] [Indexed: 05/05/2023]
Abstract
Low-dimensional hybrid metal halides are emerging as a highly promising class of single-component white-emitting materials for their unique broadband emission from self-trapped excitons (STEs). Despite substantial progress in the development of these metal halides, many challenges remain to be addressed to obtain a better fundamental understanding of the structure-property relationship and realize the full potentials of this class of materials. Here, via pressure regulation, a near 100% photoluminescence quantum yield (PLQY) of broadband emission is achieved in a corrugated 1D hybrid metal halide C5 N2 H16 Pb2 Br6 , which possesses a highly distorted structure with an initial PLQY of 10%. Compression reduces the overlap between STE states and ground state, leading to a suppressed phonon-assisted non-radiative decay. The PL evolution is systematically demonstrated to be controlled by the pressure-regulated exciton-phonon coupling which can be quantified using Huang-Rhys factor S. Detailed studies of the S-PLQY relation for a series of 1D hybrid metal halides (C5 N2 H16 Pb2 Br6 , C4 N2 H14 PbBr4 , C6 N2 H16 PbBr4 , and (C6 N2 H16 )3 Pb2 Br10 ) reveal a quantitative structure-property relationship that regulating S factor toward 28 leads to the maximum emission.
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Affiliation(s)
- Hui Luo
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), 1690 Cailun Rd, Pudong, Shanghai, 201203, China
| | - Songhao Guo
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), 1690 Cailun Rd, Pudong, Shanghai, 201203, China
| | - Yubo Zhang
- Department of Physics and Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
| | - Kejun Bu
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), 1690 Cailun Rd, Pudong, Shanghai, 201203, China
| | - Haoran Lin
- Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic, Shenzhen, Guangdong, 518055, China
| | - Yingqi Wang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), 1690 Cailun Rd, Pudong, Shanghai, 201203, China
| | - Yanfeng Yin
- State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for, Energy and Environmental Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, 116023, China
| | - Dongzhou Zhang
- Hawaii Institute of Geophysics and Planetology, University of Hawaii Manoa, Honolulu, HI, 96822, USA
| | - Shengye Jin
- State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for, Energy and Environmental Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, 116023, China
| | - Wenqing Zhang
- Department of Physics and Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
| | - Wenge Yang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), 1690 Cailun Rd, Pudong, Shanghai, 201203, China
| | - Biwu Ma
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32306, USA
| | - Xujie Lü
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), 1690 Cailun Rd, Pudong, Shanghai, 201203, China
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10
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Wang Y, Liu H, Wu M, Wang K, Sui Y, Liu Z, Lu S, Nie Z, Tse JS, Yang X, Zou B. New-phase retention in colloidal core/shell nanocrystals via pressure-modulated phase engineering. Chem Sci 2021; 12:6580-6587. [PMID: 34040733 PMCID: PMC8133026 DOI: 10.1039/d1sc00498k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Core/shell nanocrystals (NCs) integrate collaborative functionalization that would trigger advanced properties, such as high energy conversion efficiency, nonblinking emission, and spin-orbit coupling. Such prospects are highly correlated with the crystal structure of individual constituents. However, it is challenging to achieve novel phases in core/shell NCs, generally non-existing in bulk counterparts. Here, we present a fast and clean high-pressure approach to fabricate heterostructured core/shell MnSe/MnS NCs with a new phase that does not occur in their bulk counterparts. We determine the new phase as an orthorhombic MnP structure (B31 phase), with close-packed zigzagged arrangements within unit cells. Encapsulation of the solid MnSe nanorod with an MnS shell allows us to identify two separate phase transitions with recognizable diffraction patterns under high pressure, where the heterointerface effect regulates the wurtzite → rocksalt → B31 phase transitions of the core. First-principles calculations indicate that the B31 phase is thermodynamically stable under high pressure and can survive under ambient conditions owing to the synergistic effect of subtle enthalpy differences and large surface energy in nanomaterials. The ability to retain the new phase may open up the opportunity for future manipulation of electronic and magnetic properties in heterostructured nanostructures.
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Affiliation(s)
- Yixuan Wang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University Changchun 130012 China
| | - Hao Liu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University Changchun 130012 China
| | - Min Wu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University Changchun 130012 China
| | - Kai Wang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University Changchun 130012 China
| | - Yongming Sui
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University Changchun 130012 China
| | - Zhaodong Liu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University Changchun 130012 China
| | - Siyu Lu
- Green Catalysis Center, College of Chemistry, Zhengzhou University Zhengzhou 450001 China
| | - Zhihong Nie
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University Shanghai 200438 China
| | - John S Tse
- Department of Physics and Engineering Physics, University of Saskatchewan Saskatoon Saskatchewan S7N 5E2 Canada
| | - Xinyi Yang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University Changchun 130012 China
| | - Bo Zou
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University Changchun 130012 China
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11
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Guo S, Bu K, Li J, Hu Q, Luo H, He Y, Wu Y, Zhang D, Zhao Y, Yang W, Kanatzidis MG, Lü X. Enhanced Photocurrent of All-Inorganic Two-Dimensional Perovskite Cs2PbI2Cl2 via Pressure-Regulated Excitonic Features. J Am Chem Soc 2021; 143:2545-2551. [DOI: 10.1021/jacs.0c11730] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Songhao Guo
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
| | - Kejun Bu
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
| | - Jiangwei Li
- Key Lab of Organic Optoelectronics, Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Qingyang Hu
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
| | - Hui Luo
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
| | - Yihui He
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Yanhui Wu
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
| | - Dongzhou Zhang
- Hawaii Institute of Geophysics & Planetology, University of Hawaii Manoa, Honolulu, Hawaii 96822, United States
| | - Yongsheng Zhao
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
| | - Wenge Yang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
| | - Mercouri G. Kanatzidis
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Xujie Lü
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
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12
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Sun W, Dong X, Huang P, Shan J, Qi L, Zhou J. Solvothermal synthesis of Nb-doped TiO 2 nanoparticles with enhanced sonodynamic effects for destroying tumors. RSC Adv 2021; 11:36920-36927. [PMID: 35494396 PMCID: PMC9043821 DOI: 10.1039/d1ra06548c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 10/17/2021] [Indexed: 12/09/2022] Open
Abstract
Titania (TiO2) nanomaterials have been proved to be biocompatible sonosensitizers for sonodynamic therapy (SDT) of various cancer cells, while they suffer from weak sonodynamic effects due to fast combination of excited carriers. In this work, to improve the therapeutic efficiency, we prepared PEGylated Nb-doped TiO2 (TiO2−x:Nb) nanoparticles by a simple solvothermal method and a subsequent surface modification process. The TiO2−x:Nb nanoparticles exhibited an average size of 11 nm and a polydisperse index of 0.12. The Nb doping had no obvious effect on the phase of TiO2 matrixes but released electrons to the conduction band of TiO2, resulting in high concentrations of deficiencies. As a result, the TiO2−x:Nb nanoparticles exhibited a higher efficiency of singlet oxygen (1O2) generation than that of pure TiO2 nanoparticles upon ultrasound irradiation. Importantly, the TiO2−x:Nb nanoparticles had high biocompatibility similar to pure TiO2 nanoparticles, while they could efficiently produce cytotoxic 1O2 to destroy cancer cells in vitro in comparison to the partially destroyed cancer cells by pure TiO2 nanoparticles upon ultrasound irradiation. More importantly, the TiO2−x:Nb nanoparticles displayed obvious tumor cellular injury in tumor-bearing mice in vivo through high SDT effects. Therefore, the synthesized PEGylated TiO2−x:Nb nanoparticles in this study exhibited higher therapeutic effects of SDT than that of the pure TiO2 nanoparticles, and the doping strategy would provide some insights for tuning traditional weak sonosensitizers into efficient ones. TiO2−x:Nb nanoparticles displayed obvious tumor cellular injury in tumor-bearing mice in vivo through high SDT effect.![]()
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Affiliation(s)
- Wenjie Sun
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Institute of Advanced Materials for Nano-Bio Applications, School of Ophthalmology and Optometry, School of Biomedical Engineering, Wenzhou Medical University, Wenzhou, 325035, China
| | - Xiaojuan Dong
- Center for Reproductive Medicine, Naval Medical Center of PLA, Second Military Medical University, Shanghai 200052, China
| | - Pingping Huang
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Institute of Advanced Materials for Nano-Bio Applications, School of Ophthalmology and Optometry, School of Biomedical Engineering, Wenzhou Medical University, Wenzhou, 325035, China
| | - Jia Shan
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Institute of Advanced Materials for Nano-Bio Applications, School of Ophthalmology and Optometry, School of Biomedical Engineering, Wenzhou Medical University, Wenzhou, 325035, China
| | - Lei Qi
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Institute of Advanced Materials for Nano-Bio Applications, School of Ophthalmology and Optometry, School of Biomedical Engineering, Wenzhou Medical University, Wenzhou, 325035, China
| | - Jun Zhou
- Shanghai Xuhui Central Hospital, Zhongshan-Xuhui Hospital, Fudan University, Shanghai 200031, China
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13
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Zhang M, Wang Y, Zhang Y, Song J, Si Y, Yan J, Ma C, Liu Y, Yu J, Ding B. Conductive and Elastic TiO
2
Nanofibrous Aerogels: A New Concept toward Self‐Supported Electrocatalysts with Superior Activity and Durability. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202010110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Meng Zhang
- Key Laboratory of High Performance Fibers & Products (Ministry of Education) College of Textiles Donghua University Shanghai 201620 China
| | - Yan Wang
- College of Materials Science and Engineering Donghua University Shanghai 201620 China
| | - Yuanyuan Zhang
- Key Laboratory of High Performance Fibers & Products (Ministry of Education) College of Textiles Donghua University Shanghai 201620 China
| | - Jun Song
- College of Materials Science and Engineering Donghua University Shanghai 201620 China
| | - Yang Si
- Innovation Center for Textile Science and Technology Donghua University Shanghai 200051 China
| | - Jianhua Yan
- Key Laboratory of High Performance Fibers & Products (Ministry of Education) College of Textiles Donghua University Shanghai 201620 China
| | - Chunlan Ma
- Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and Technology, Suzhou University of Science and Technology Suzhou 215009 China
| | - Yi‐Tao Liu
- Key Laboratory of High Performance Fibers & Products (Ministry of Education) College of Textiles Donghua University Shanghai 201620 China
- Innovation Center for Textile Science and Technology Donghua University Shanghai 200051 China
| | - Jianyong Yu
- Innovation Center for Textile Science and Technology Donghua University Shanghai 200051 China
| | - Bin Ding
- Key Laboratory of High Performance Fibers & Products (Ministry of Education) College of Textiles Donghua University Shanghai 201620 China
- Innovation Center for Textile Science and Technology Donghua University Shanghai 200051 China
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14
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Lü X, Stoumpos C, Hu Q, Ma X, Zhang D, Guo S, Hoffman J, Bu K, Guo X, Wang Y, Ji C, Chen H, Xu H, Jia Q, Yang W, Kanatzidis MG, Mao HK. Regulating off-centering distortion maximizes photoluminescence in halide perovskites. Natl Sci Rev 2020; 8:nwaa288. [PMID: 34691729 PMCID: PMC8433095 DOI: 10.1093/nsr/nwaa288] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 11/22/2020] [Accepted: 11/22/2020] [Indexed: 11/24/2022] Open
Abstract
Metal halide perovskites possess unique atomic and electronic configurations that endow them with high defect tolerance and enable high-performance photovoltaics and optoelectronics. Perovskite light-emitting diodes have achieved an external quantum efficiency of over 20%. Despite tremendous progress, fundamental questions remain, such as how structural distortion affects the optical properties. Addressing their relationships is considerably challenging due to the scarcity of effective diagnostic tools during structural and property tuning as well as the limited tunability achievable by conventional methods. Here, using pressure and chemical methods to regulate the metal off-centering distortion, we demonstrate the giant tunability of photoluminescence (PL) in both the intensity (>20 times) and wavelength (>180 nm/GPa) in the highly distorted halide perovskites [CH3NH3GeI3, HC(NH2)2GeI3, and CsGeI3]. Using advanced in situ high-pressure probes and first-principles calculations, we quantitatively reveal a universal relationship whereby regulating the level of off-centering distortion towards 0.2 leads to the best PL performance in the halide perovskites. By applying this principle, intense PL can still be induced by substituting CH3NH3+ with Cs+ to control the distortion in (CH3NH3)1-xCsxGeI3, where the chemical substitution plays a similar role as external pressure. The compression of a fully substituted sample of CsGeI3 further tunes the distortion to the optimal value at 0.7 GPa, which maximizes the emission with a 10-fold enhancement. This work not only demonstrates a quantitative relationship between structural distortion and PL property of the halide perovskites but also illustrates the use of knowledge gained from high-pressure research to achieve the desired properties by ambient methods.
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Affiliation(s)
- Xujie Lü
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
| | - Constantinos Stoumpos
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA
- Department of Materials Science and Technology, Voutes Campus, University of Crete, Heraklion GR-70013, Greece
| | - Qingyang Hu
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
| | - Xuedan Ma
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Dongzhou Zhang
- Partnership for Extreme Crystallography, University of Hawaii at Manoa, Honolulu, HI 96822, USA
| | - Songhao Guo
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
| | - Justin Hoffman
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA
| | - Kejun Bu
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
| | - Xiaofeng Guo
- Department of Chemistry and Alexandra Navrotsky Institute for Experimental Thermodynamics, Washington State University, Pullman, WA 99164, USA
| | - Yingqi Wang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
| | - Cheng Ji
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
| | - Haijie Chen
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA
| | - Hongwu Xu
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Quanxi Jia
- Department of Materials Design and Innovation, University at Buffalo—The State University of New York, Buffalo, NY 14260, USA
| | - Wenge Yang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
| | | | - Ho-Kwang Mao
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
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15
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Reducing Packing Factor of ZnIn2S4 to Promote Photocatalytic Activity. Chem Res Chin Univ 2020. [DOI: 10.1007/s40242-020-0308-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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16
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Zhang M, Wang Y, Zhang Y, Song J, Si Y, Yan J, Ma C, Liu Y, Yu J, Ding B. Conductive and Elastic TiO
2
Nanofibrous Aerogels: A New Concept toward Self‐Supported Electrocatalysts with Superior Activity and Durability. Angew Chem Int Ed Engl 2020; 59:23252-23260. [DOI: 10.1002/anie.202010110] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Indexed: 11/05/2022]
Affiliation(s)
- Meng Zhang
- Key Laboratory of High Performance Fibers & Products (Ministry of Education) College of Textiles Donghua University Shanghai 201620 China
| | - Yan Wang
- College of Materials Science and Engineering Donghua University Shanghai 201620 China
| | - Yuanyuan Zhang
- Key Laboratory of High Performance Fibers & Products (Ministry of Education) College of Textiles Donghua University Shanghai 201620 China
| | - Jun Song
- College of Materials Science and Engineering Donghua University Shanghai 201620 China
| | - Yang Si
- Innovation Center for Textile Science and Technology Donghua University Shanghai 200051 China
| | - Jianhua Yan
- Key Laboratory of High Performance Fibers & Products (Ministry of Education) College of Textiles Donghua University Shanghai 201620 China
| | - Chunlan Ma
- Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and Technology, Suzhou University of Science and Technology Suzhou 215009 China
| | - Yi‐Tao Liu
- Key Laboratory of High Performance Fibers & Products (Ministry of Education) College of Textiles Donghua University Shanghai 201620 China
- Innovation Center for Textile Science and Technology Donghua University Shanghai 200051 China
| | - Jianyong Yu
- Innovation Center for Textile Science and Technology Donghua University Shanghai 200051 China
| | - Bin Ding
- Key Laboratory of High Performance Fibers & Products (Ministry of Education) College of Textiles Donghua University Shanghai 201620 China
- Innovation Center for Textile Science and Technology Donghua University Shanghai 200051 China
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17
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Xu W, Russo PA, Schultz T, Koch N, Pinna N. Niobium‐Doped Titanium Dioxide with High Dopant Contents for Enhanced Lithium‐Ion Storage. ChemElectroChem 2020. [DOI: 10.1002/celc.202001040] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Wenlei Xu
- Institut für Chemie and IRIS Adlershof Humboldt-Universität zu Berlin Brook-Taylor-Str. 2 12489 Berlin Germany
| | - Patrícia A. Russo
- Institut für Chemie and IRIS Adlershof Humboldt-Universität zu Berlin Brook-Taylor-Str. 2 12489 Berlin Germany
| | - Thorsten Schultz
- Institut für Physik and IRIS Adlershof Humboldt-Universität zu Berlin Brook-Taylor-Str. 2 12489 Berlin Germany
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH Albert-Einstein Str. 15 12489 Berlin Germany
| | - Norbert Koch
- Institut für Physik and IRIS Adlershof Humboldt-Universität zu Berlin Brook-Taylor-Str. 2 12489 Berlin Germany
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH Albert-Einstein Str. 15 12489 Berlin Germany
| | - Nicola Pinna
- Institut für Chemie and IRIS Adlershof Humboldt-Universität zu Berlin Brook-Taylor-Str. 2 12489 Berlin Germany
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18
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Sanehira Y, Shibayama N, Numata Y, Ikegami M, Miyasaka T. Low-Temperature Synthesized Nb-Doped TiO 2 Electron Transport Layer Enabling High-Efficiency Perovskite Solar Cells by Band Alignment Tuning. ACS APPLIED MATERIALS & INTERFACES 2020; 12:15175-15182. [PMID: 32149492 DOI: 10.1021/acsami.9b23485] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
An Nb-doped TiO2 (Nb-TiO2) film comprising a double structure stacked with a bottom compact layer and top mesoporous layers was synthesized by treating a Ti precursor-coated substrate using a one-step low-temperature steam-annealing (SA) method. The SA-based Nb-TiO2 films possess high crystallinity and conductivity, and that allows better control over the conduction band (CB) of TiO2 for the electron transport layer (ETL) of the perovskite solar cells by the Nb doping level. Optimization of power conversion efficiency (PCE) for the Nb-TiO2-based ETL was combined with the CB level tuning of the mixed-halide perovskite by changing the Br/I ratio. This band offset management enabled to establish the most suitable energy levels between the ETL and the perovskites. This method was applied to reduce the band gap of perovskites to enhance the photocurrent density while maintaining a high open-circuit voltage. As a result, the optimal combination of 5 mol % Nb-TiO2 ETL and 10 mol % Br in the mixed-halide perovskite exhibited high photovoltaic performance for low-temperature device fabrication, achieving a high-yield PCE of 21.3%.
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Affiliation(s)
- Yoshitaka Sanehira
- Graduate School of Engineering, Toin University of Yokohama, 1614 Kurogane-cho, Aoba, Yokohama, Kanagawa 225-8503, Japan
| | - Naoyuki Shibayama
- Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8904, Japan
| | - Youhei Numata
- Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8904, Japan
| | - Masashi Ikegami
- Graduate School of Engineering, Toin University of Yokohama, 1614 Kurogane-cho, Aoba, Yokohama, Kanagawa 225-8503, Japan
| | - Tsutomu Miyasaka
- Graduate School of Engineering, Toin University of Yokohama, 1614 Kurogane-cho, Aoba, Yokohama, Kanagawa 225-8503, Japan
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19
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Feng W, Maça RR, Etacheri V. High-Energy-Density Sodium-Ion Hybrid Capacitors Enabled by Interface-Engineered Hierarchical TiO 2 Nanosheet Anodes. ACS APPLIED MATERIALS & INTERFACES 2020; 12:4443-4453. [PMID: 31909958 DOI: 10.1021/acsami.9b17775] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Sodium-ion hybrid capacitors are known for their high power densities and superior cycle life compared to Na-ion batteries. However, low energy densities (<100 Wh kg-1) due to the lack of high-capacity (>150 mAh g-1) anodes capable of fast charging are delaying their practical implementation. Herein, we report a high-performance Na-ion hybrid capacitor based on an interface-engineered hierarchical TiO2 nanosheet anode consisting of bronze (∼15%) and anatase (∼85%) crystallites (∼10 nm). This pseudocapacitive dual-phase anode demonstrated exceptional specific capacity of 289 mAh g-1 at 0.025 A g-1 and excellent rate capability (110 mAh g-1 at 1.0 A g-1). The Na-ion hybrid capacitor integrating a dual-phase hierarchical TiO2 nanosheet anode and an activated carbon cathode exhibited a high energy density of 200 Wh kg-1 (based on the total mass of active materials in both electrodes) and power density of 6191 W kg-1. These values are in the energy and power density range of Li-ion batteries (100-300 Wh kg-1) and supercapacitors (5000-15 000 W kg-1), respectively. Furthermore, exceptional capacity retention of 80% is observed after 5000 charge-discharge cycles. Outstanding electrochemical performance of the demonstrated Na-ion hybrid capacitor is credited to the enhanced pseudocapacitive Na-ion intercalation of the two-dimensional TiO2 anode resulting from nanointerfaces between bronze and anatase crystallites. Mechanistic investigations evidenced Na-ion storage through intercalation pseudocapacitance with minimal structural changes. This approach of nanointerface-induced pseudocapacitance presents great opportunities toward developing advanced electrode materials for next-generation Na-ion hybrid capacitors.
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Affiliation(s)
- Wenliang Feng
- Electrochemistry Division , IMDEA Materials Institute , C/Eric Kandel 2 , Getafe , Madrid 28906 , Spain
- Department of Materials Science , Polytechnic University of Madrid , E.T.S. de Ingenieros de Caminos , Madrid 28040 , Spain
| | - Rudi Ruben Maça
- Electrochemistry Division , IMDEA Materials Institute , C/Eric Kandel 2 , Getafe , Madrid 28906 , Spain
- Faculty of Science , Autonomous University of Madrid , C/Francisco Tomás y Valiente, 7 , Madrid 28049 , Spain
| | - Vinodkumar Etacheri
- Electrochemistry Division , IMDEA Materials Institute , C/Eric Kandel 2 , Getafe , Madrid 28906 , Spain
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20
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Liu F, Dong Z, Liu L. Comparative study on the pressure-induced phase transformation of anatase TiO 2 hollow and solid microspheres. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:395403. [PMID: 31242467 DOI: 10.1088/1361-648x/ab2d17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Nanostructured anatase TiO2 undergoes pressure-induced phase transformation, and the transformation sequence is significantly different from the bulk counterpart. The size and the morphology are found both playing a critical role in the phase transformation behavior. In this work, we prepare anatase TiO2 microspheres using a hydrothermal method. By controlling the reaction time, hollow and solid spheres of similar diameters are prepared. TEM and XRD analysis reveals that these microspheres are aggregates of anatase nanocrystalline of size between 15-16 nm. The phase transformation behaviour under high temperature is examined in situ using both Raman spectroscopy and synchrotron x-ray diffraction. We find that although both solid and hollow spheres are micron-sized, they undergo phase transformation sequence similar to nanomaterials with size of several tens of nanometers. Hollow spheres exhibit a higher compressibility than the solid spheres. A detailed analysis based on the formation mechanism of the spheres is performed to explain the unique phase transformation behavior of these materials.
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Affiliation(s)
- Fang Liu
- Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, Jiangsu 215123, People's Republic of China
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21
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Chen Q, Cheng T, Fu H, Zhu Y. Crystal phase regulation in noble metal nanocrystals. CHINESE JOURNAL OF CATALYSIS 2019. [DOI: 10.1016/s1872-2067(19)63385-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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22
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Das P, Devi PS, Blom DA, Vogt T, Lee Y. High-Pressure Phase Transitions of Morphologically Distinct Zn 2SnO 4 Nanostructures. ACS OMEGA 2019; 4:10539-10547. [PMID: 31460152 PMCID: PMC6649287 DOI: 10.1021/acsomega.9b01361] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Accepted: 06/06/2019] [Indexed: 06/10/2023]
Abstract
Many aspects of nanostructured materials at high pressures are still unexplored. We present here, high-pressure structural behavior of two Zn2SnO4 nanomaterials with inverse spinel type, one a particle with size of ∼7 nm [zero dimensional (0-D)] and the other with a chain-like [one dimensional (1-D)] morphology. We performed in situ micro-Raman and synchrotron X-ray diffraction measurements and observed that the cation disordering of the 0-D nanoparticle is preserved up to ∼40 GPa, suppressing the reported martensitic phase transformation. On the other hand, an irreversible phase transition is observed from the 1-D nanomaterial into a new and dense high-pressure orthorhombic CaFe2O4-type structure at ∼40 GPa. The pressure-treated 0-D and 1-D nanomaterials have distinct diffuse reflectance and emission properties. In particular, a heterojunction between the inverse spinel and quenchable orthorhombic phases allows the use of 1-D Zn2SnO4 nanomaterials as efficient photocatalysts as shown by the degradation of the textile pollutant methylene blue.
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Affiliation(s)
- Partha
Pratim Das
- Department
of Earth System Sciences, Yonsei University, Seoul 120749, Korea
| | - P. Sujatha Devi
- Sensor
and Actuator Division, CSIR-Central Glass
and Ceramic Research Institute, Kolkata 700032, India
| | - Douglas A. Blom
- NanoCenter & Department of Chemical
Engineering,
and NanoCenter &
Department of Chemistry & Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Thomas Vogt
- NanoCenter & Department of Chemical
Engineering,
and NanoCenter &
Department of Chemistry & Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Yongjae Lee
- Department
of Earth System Sciences, Yonsei University, Seoul 120749, Korea
- Center
for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
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23
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Review on heterophase/homophase junctions for efficient photocatalysis: The case of phase transition construction. CHINESE JOURNAL OF CATALYSIS 2019. [DOI: 10.1016/s1872-2067(19)63290-0] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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24
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Bai F, Bian K, Huang X, Wang Z, Fan H. Pressure Induced Nanoparticle Phase Behavior, Property, and Applications. Chem Rev 2019; 119:7673-7717. [PMID: 31059242 DOI: 10.1021/acs.chemrev.9b00023] [Citation(s) in RCA: 89] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Nanoparticle (NP) high pressure behavior has been extensively studied over the years. In this review, we summarize recent progress on the studies of pressure induced NP phase behavior, property, and applications. This review starts with a brief overview of high pressure characterization techniques, coupled with synchrotron X-ray scattering, Raman, fluorescence, and absorption. Then, we survey the pressure induced phase transition of NP atomic crystal structure including size dependent phase transition, amorphization, and threshold pressures using several typical NP material systems as examples. Next, we discuss the pressure induced phase transition of NP mesoscale structures including topics on pressure induced interparticle separation distance, NP coupling, and NP coalescence. Pressure induced new properties and applications in different NP systems are highlighted. Finally, outlooks with future directions are discussed.
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Affiliation(s)
- Feng Bai
- Key Laboratory for Special Functional Materials of the Ministry of Education, Henan University, Kaifeng 475004, P. R. China
| | - Kaifu Bian
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Xin Huang
- Cornell High Energy Synchrotron Source, Cornell University, Ithaca, New York 14853, United States
| | - Zhongwu Wang
- Cornell High Energy Synchrotron Source, Cornell University, Ithaca, New York 14853, United States
| | - Hongyou Fan
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States.,Department of Chemical and Biological Engineering, Albuquerque, University of New Mexico, Albuquerque, New Mexico 87106, United States.,Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
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25
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Yu J, Zhang C, Yang Y, Yi G, Fan R, Li L, Xing B, Liu Q, Jia J, Huang G. Lignite-derived carbon quantum dot/TiO2 heterostructure nanocomposites: photoinduced charge transfer properties and enhanced visible light photocatalytic activity. NEW J CHEM 2019. [DOI: 10.1039/c9nj04860j] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A facile and green route to cleanly utilize lignite coal as a carbon source for preparing CQDs/TiO2 catalysts.
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26
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Bu K, Luo M, Wang R, Zhang X, He J, Wang D, Zhao W, Huang F. Enhanced Photoelectric SrOCuSbS2 of a [SrO]-Intercalated CuSbS2 Structure. Inorg Chem 2018; 58:69-72. [DOI: 10.1021/acs.inorgchem.8b03082] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kejun Bu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Mengjia Luo
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ruiqi Wang
- State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
| | - Xian Zhang
- Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing 100094, People’s Republic of China
| | - Jianqiao He
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Dong Wang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wei Zhao
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
| | - Fuqiang Huang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
- State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
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27
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Tayeb AH, Amini E, Ghasemi S, Tajvidi M. Cellulose Nanomaterials-Binding Properties and Applications: A Review. Molecules 2018; 23:E2684. [PMID: 30340374 PMCID: PMC6222763 DOI: 10.3390/molecules23102684] [Citation(s) in RCA: 131] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 10/03/2018] [Accepted: 10/13/2018] [Indexed: 02/07/2023] Open
Abstract
Cellulose nanomaterials (CNs) are of increasing interest due to their appealing inherent properties such as bio-degradability, high surface area, light weight, chirality and the ability to form effective hydrogen bonds across the cellulose chains or within other polymeric matrices. Extending CN self-assembly into multiphase polymer structures has led to useful end-results in a wide spectrum of products and countless innovative applications, for example, as reinforcing agent, emulsion stabilizer, barrier membrane and binder. In the current contribution, after a brief description of salient nanocellulose chemical structure features, its types and production methods, we move to recent advances in CN utilization as an ecofriendly binder in several disparate areas, namely formaldehyde-free hybrid composites and wood-based panels, papermaking/coating processes, and energy storage devices, as well as their potential applications in biomedical fields as a cost-effective and tissue-friendly binder for cartilage regeneration, wound healing and dental repair. The prospects of a wide range of hybrid materials that may be produced via nanocellulose is introduced in light of the unique behavior of cellulose once in nano dimensions. Furthermore, we implement some principles of colloidal and interfacial science to discuss the critical role of cellulose binding in the aforesaid fields. Even though the CN facets covered in this study by no means encompass the great amount of literature available, they may be regarded as the basis for future developments in the binder applications of these highly desirable materials.
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Affiliation(s)
- Ali H Tayeb
- School of Forest Resources, University of Maine, 5755 Nutting Hall, Orono, ME 04469, USA.
- Advanced Structures and Composites Center, University of Maine, 35 Flagstaff Road, Orono, ME 04469, USA.
| | - Ezatollah Amini
- School of Forest Resources, University of Maine, 5755 Nutting Hall, Orono, ME 04469, USA.
| | - Shokoofeh Ghasemi
- School of Forest Resources, University of Maine, 5755 Nutting Hall, Orono, ME 04469, USA.
| | - Mehdi Tajvidi
- School of Forest Resources, University of Maine, 5755 Nutting Hall, Orono, ME 04469, USA.
- Advanced Structures and Composites Center, University of Maine, 35 Flagstaff Road, Orono, ME 04469, USA.
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Bendova M, Kolar J, Gispert-Guirado F, Mozalev A. Porous-Alumina-Assisted Growth of Nanostructured Anodic Films on Ti−Nb Alloys. ChemElectroChem 2018. [DOI: 10.1002/celc.201800785] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Maria Bendova
- CEITEC - Central European Institute of Technology; Brno University of Technology; Purkynova 123 61200 Brno Czech Republic
| | - Jakub Kolar
- CEITEC - Central European Institute of Technology; Brno University of Technology; Purkynova 123 61200 Brno Czech Republic
| | - Francesc Gispert-Guirado
- SRCiT - Scientific Resources Service; University Rovira i Virgili; Av. Paisos Catalans 26 43007 Tarragona, Catalonia Spain
| | - Alexander Mozalev
- CEITEC - Central European Institute of Technology; Brno University of Technology; Purkynova 123 61200 Brno Czech Republic
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29
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Bernsmeier D, Bernicke M, Schmack R, Sachse R, Paul B, Bergmann A, Strasser P, Ortel E, Kraehnert R. Oxygen Evolution Catalysts Based on Ir-Ti Mixed Oxides with Templated Mesopore Structure: Impact of Ir on Activity and Conductivity. CHEMSUSCHEM 2018; 11:2367-2374. [PMID: 29813183 DOI: 10.1002/cssc.201800932] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Indexed: 06/08/2023]
Abstract
The efficient generation of hydrogen via water electrolysis requires highly active oxygen evolution catalysts. Among the active metals, iridium oxide provides the best compromise in terms of activity and stability. The limited availability and usage in other applications demands an efficient utilization of this precious metal. Forming mixed oxides with titania promises improved Ir utilization, but often at the cost of a low catalyst surface area. Moreover, the role of Ir in establishing a sufficiently conductive mixed oxide has not been elucidated so far. We report a new approach for the synthesis of Ir/TiOx mixed-oxide catalysts with defined template-controlled mesoporous structure, low crystallinity, and superior oxygen evolution reaction (OER) activity. The highly accessible pore system provides excellent Ir dispersion and avoids transport limitations. A controlled variation of the oxides Ir content reveals the importance of the catalysts electrical conductivity: at least 0.1 S m-1 are required to avoid limitations owing to slow electron transport. For sufficiently conductive oxides a clear linear correlation between Ir surface sites and OER currents can be established, where all accessible Ir sites equally contribute to the reaction. The optimized catalysts outperform Ir/TiOx materials reported in literature by about a factor of at least four.
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Affiliation(s)
- Denis Bernsmeier
- Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany), Contact
| | - Michael Bernicke
- Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany), Contact
| | - Roman Schmack
- Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany), Contact
| | - René Sachse
- Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany), Contact
| | - Benjamin Paul
- Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany), Contact
| | - Arno Bergmann
- Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany), Contact
| | - Peter Strasser
- Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany), Contact
| | - Erik Ortel
- Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany), Contact
| | - Ralph Kraehnert
- Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany), Contact
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30
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Girardi L, Shuang S, Rizzi GA, Sartorel A, Marega C, Zhang Z, Granozzi G. Visible Light Driven Photoanodes for Water Oxidation Based on Novel r-GO/β-Cu₂V₂O₇/TiO₂ Nanorods Composites. NANOMATERIALS 2018; 8:nano8070544. [PMID: 30022003 PMCID: PMC6070958 DOI: 10.3390/nano8070544] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 07/04/2018] [Accepted: 07/16/2018] [Indexed: 11/18/2022]
Abstract
This paper describes the preparation and the photoelectrochemical performances of visible light driven photoanodes based on novel r-GO/β-Cu2V2O7/TiO2 nanorods/composites. β-Cu2V2O7 was deposited on both fluorine doped tin oxide (FTO) and TiO2 nanorods (NRs)/FTO by a fast and convenient Aerosol Assisted Spray Pyrolysis (AASP) procedure. Ethylenediamine (EN), ammonia and citric acid (CA) were tested as ligands for Cu2+ ions in the aerosol precursors solution. The best-performing deposits, in terms of photocurrent density, were obtained when NH3 was used as ligand. When β-Cu2V2O7 was deposited on the TiO2 NRs a good improvement in the durability of the photoanode was obtained, compared with pure β-Cu2V2O7 on FTO. A further remarkable improvement in durability and photocurrent density was obtained upon addition, by electrophoretic deposition, of reduced graphene oxide (r-GO) flakes on the β-Cu2V2O7/TiO2 composite material. The samples were characterized by X-ray Photoelectron Spectroscopy (XPS), Raman, High Resolution Transmission Electron Microscopy (HR-TEM), Scanning Electron Microscopy (SEM), Wide Angle X-ray Diffraction (WAXD) and UV–Vis spectroscopies. The photoelectrochemical (PEC) performances of β-Cu2V2O7 on FTO, β-Cu2V2O7/TiO2 and r-GO/β-Cu2V2O7/TiO2 were tested in visible light by linear voltammetry and Electrochemical Impedance Spectroscopy (EIS) measurements.
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Affiliation(s)
- Leonardo Girardi
- University of Padova and INSTM Unit, via Marzolo 1, 35121 Padova, Italy.
| | - Shuang Shuang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
| | - Gian Andrea Rizzi
- University of Padova and INSTM Unit, via Marzolo 1, 35121 Padova, Italy.
| | - Andrea Sartorel
- University of Padova and INSTM Unit, via Marzolo 1, 35121 Padova, Italy.
| | - Carla Marega
- University of Padova and INSTM Unit, via Marzolo 1, 35121 Padova, Italy.
| | - Zhengjun Zhang
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
| | - Gaetano Granozzi
- University of Padova and INSTM Unit, via Marzolo 1, 35121 Padova, Italy.
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31
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Zhang L, Zheng Q, Xie Y, Lan Z, Prezhdo OV, Saidi WA, Zhao J. Delocalized Impurity Phonon Induced Electron-Hole Recombination in Doped Semiconductors. NANO LETTERS 2018; 18:1592-1599. [PMID: 29393653 DOI: 10.1021/acs.nanolett.7b03933] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Semiconductor doping is often proposed as an effective route to improving the solar energy conversion efficiency by engineering the band gap; however, it may also introduce electron-hole (e-h) recombination centers, where the determining element for e-h recombination is still unclear. Taking doped TiO2 as a prototype system and by using time domain ab initio nonadiabatic molecular dynamics, we find that the localization of impurity-phonon modes (IPMs) is the key parameter to determine the e-h recombination time scale. Noncompensated charge doping introduces delocalized impurity-phonon modes that induce ultrafast e-h recombination within several picoseconds. However, the recombination can be largely suppressed using charge-compensated light-mass dopants due to the localization of their IPMs. For different doping systems, the e-h recombination time is shown to depend exponentially on the IPM localization. We propose that the observation that delocalized IPMs can induce fast e-h recombination is broadly applicable and can be used in the design and synthesis of functional semiconductors with optimal dopant control.
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Affiliation(s)
| | | | - Yu Xie
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology , Chinese Academy of Sciences , Qingdao , Shandong 266101 , China
| | - Zhenggang Lan
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology , Chinese Academy of Sciences , Qingdao , Shandong 266101 , China
| | - Oleg V Prezhdo
- Departments of Chemistry, and Physics and Astronomy , University of Southern California , Los Angeles , California 90089 , United States
| | - Wissam A Saidi
- Department of Mechanical Engineering and Materials Science , University of Pittsburgh , Pittsburgh , Pennsylvania 15261 , United States
| | - Jin Zhao
- Department of Physics and Astronomy , University of Pittsburgh , Pittsburgh , Pennsylvania 15260 , United States
- Synergetic Innovation Center of Quantum Information & Quantum Physics and ∇Department of Physics , University of Science and Technology of China , Hefei , Anhui 230026 , China
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32
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Zhao Z, Ge G, Zhang D. Heteroatom-Doped Carbonaceous Photocatalysts for Solar Fuel Production and Environmental Remediation. ChemCatChem 2017. [DOI: 10.1002/cctc.201700707] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Zhongkui Zhao
- State Key Laboratory of Fine Chemicals; Department of Catalysis Chemistry and Engineering; Dalian University of Technology; 2 Linggong Road Dalian 116024 P.R. China
| | - Guifang Ge
- State Key Laboratory of Fine Chemicals; Department of Catalysis Chemistry and Engineering; Dalian University of Technology; 2 Linggong Road Dalian 116024 P.R. China
| | - Di Zhang
- State Key Laboratory of Fine Chemicals; Department of Catalysis Chemistry and Engineering; Dalian University of Technology; 2 Linggong Road Dalian 116024 P.R. China
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33
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Colossal permittivity behavior and its origin in rutile (Mg 1/3Ta 2/3) xTi 1-xO 2. Sci Rep 2017; 7:9950. [PMID: 28855617 PMCID: PMC5577065 DOI: 10.1038/s41598-017-08992-x] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Accepted: 07/21/2017] [Indexed: 12/02/2022] Open
Abstract
This work investigates the synthesis, chemical composition, defect structures and associated dielectric properties of (Mg2+, Ta5+) co-doped rutile TiO2 polycrystalline ceramics with nominal compositions of (Mg2+1/3Ta5+2/3)xTi1−xO2. Colossal permittivity (>7000) with a low dielectric loss (e.g. 0.002 at 1 kHz) across a broad frequency/temperature range can be achieved at x = 0.5% after careful optimization of process conditions. Both experimental and theoretical evidence indicates such a colossal permittivity and low dielectric loss intrinsically originate from the intragrain polarization that links to the electron-pinned \documentclass[12pt]{minimal}
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\begin{document}$${\bf{M}}{{\bf{g}}}_{{\bf{T}}{\bf{i}}}^{{\prime}{\prime} }+{{\bf{V}}}_{{\bf{O}}}^{\bullet \bullet }+{\bf{2}}{\bf{T}}{{\bf{a}}}_{{\bf{T}}{\bf{i}}}^{\bullet }+{\bf{2}}{\bf{T}}{{\bf{i}}}_{{\bf{T}}{\bf{i}}}^{\prime}$$\end{document}MgTi′′+VO••+2TaTi•+2TiTi′ defect clusters with a specific configuration, different from the defect cluster form previously reported in tri-/pent-valent ion co-doped rutile TiO2. This work extends the research on colossal permittivity and defect formation to bi-/penta-valent ion co-doped rutile TiO2 and elucidates a likely defect cluster model for this system. We therefore believe these results will benefit further development of colossal permittivity materials and advance the understanding of defect chemistry in solids.
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34
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Lü X, Yang W, Jia Q, Xu H. Pressure-induced dramatic changes in organic-inorganic halide perovskites. Chem Sci 2017; 8:6764-6776. [PMID: 29147500 PMCID: PMC5643890 DOI: 10.1039/c7sc01845b] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Accepted: 08/28/2017] [Indexed: 12/19/2022] Open
Abstract
Organic-inorganic halide perovskites have emerged as a promising family of functional materials for advanced photovoltaic and optoelectronic applications with high performances and low costs. Various chemical methods and processing approaches have been employed to modify the compositions, structures, morphologies, and electronic properties of hybrid perovskites. However, challenges still remain in terms of their stability, the use of environmentally unfriendly chemicals, and the lack of an insightful understanding into structure-property relationships. Alternatively, pressure, a fundamental thermodynamic parameter that can significantly alter the atomic and electronic structures of functional materials, has been widely utilized to further our understanding of structure-property relationships, and also to enable emergent or enhanced properties of given materials. In this perspective, we describe the recent progress of high-pressure research on hybrid perovskites, particularly regarding pressure-induced novel phenomena and pressure-enhanced properties. We discuss the effect of pressure on structures and properties, their relationships and the underlying mechanisms. Finally, we give an outlook on future research avenues in which high pressure and related alternative methods such as chemical tailoring and interfacial engineering may lead to novel hybrid perovskites uniquely suited for high-performance energy applications.
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Affiliation(s)
- Xujie Lü
- Los Alamos National Laboratory , Los Alamos , NM 87545 , USA . ;
| | - Wenge Yang
- Center for High Pressure Science and Technology Advanced Research , Shanghai 201203 , China
| | - Quanxi Jia
- Los Alamos National Laboratory , Los Alamos , NM 87545 , USA . ; .,Department of Materials Design and Innovation , University at Buffalo - The State University of New York , Buffalo , NY 14260 , USA .
| | - Hongwu Xu
- Los Alamos National Laboratory , Los Alamos , NM 87545 , USA . ;
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35
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Zhu SC, Hu Q, Mao WL, Mao HK, Sheng H. Hydrogen-Bond Symmetrization Breakdown and Dehydrogenation Mechanism of FeO2H at High Pressure. J Am Chem Soc 2017; 139:12129-12132. [PMID: 28829596 DOI: 10.1021/jacs.7b06528] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sheng-cai Zhu
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, People’s Republic of China
| | - Qingyang Hu
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, People’s Republic of China
- Department
of Geological Sciences, Stanford University, Stanford, California 94305, United States
| | - Wendy L. Mao
- Department
of Geological Sciences, Stanford University, Stanford, California 94305, United States
| | - Ho-kwang Mao
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, People’s Republic of China
- Geophysical
Laboratory, Carnegie Institution of Washington, Washington, D.C. 20015, United States
| | - Hongwei Sheng
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, People’s Republic of China
- Department
of Physics and Astronomy, George Mason University, Fairfax, Virginia 22030, United States
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36
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Qiao L, Swihart MT. Solution-phase synthesis of transition metal oxide nanocrystals: Morphologies, formulae, and mechanisms. Adv Colloid Interface Sci 2017; 244:199-266. [PMID: 27246718 DOI: 10.1016/j.cis.2016.01.005] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2015] [Revised: 01/13/2016] [Accepted: 01/20/2016] [Indexed: 12/26/2022]
Abstract
In this review, we provide a broad overview of solution-phase synthesis of transition metal oxide nanocrystals (NCs), including a substantial catalog of published methods, and a unifying classification and discussion. Prevalent subcategories of solution-phase synthesis are delineated and general features are summarized. The diverse morphologies achievable by solution-phase synthesis are defined and exemplified. This is followed by sequential consideration of the solution-phase synthesis of first-row transition metal oxides. The common oxides of Ti, V, Mn, Fe, Co, Ni, Cu, and Zn are introduced; major crystal lattices are presented and illustrated; representative examples are explained; and numerous synthesis formulae are tabulated. Following this presentation of experimental studies, we present an introduction to theories of NC nucleation and growth. Various models of NC nucleation and growth are addressed, and important concepts determining the growth and structure of colloidal NCs are explained. Overall, this review provides an entry into systematic understanding of solution-phase synthesis of nanocrystals, with a reasonably comprehensive survey of results for the important category of transition metal oxide NCs.
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Affiliation(s)
- Liang Qiao
- Chemical and Biological Engineering, University at Buffalo (SUNY), Buffalo, NY 14260-4200, USA
| | - Mark T Swihart
- Chemical and Biological Engineering, University at Buffalo (SUNY), Buffalo, NY 14260-4200, USA.
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37
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Nirmale TC, Kale BB, Varma AJ. A review on cellulose and lignin based binders and electrodes: Small steps towards a sustainable lithium ion battery. Int J Biol Macromol 2017; 103:1032-1043. [PMID: 28554795 DOI: 10.1016/j.ijbiomac.2017.05.155] [Citation(s) in RCA: 101] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 05/23/2017] [Accepted: 05/25/2017] [Indexed: 12/11/2022]
Abstract
Lithium ion batteries (LIB) are the most promising energy storage systems for portable electronics and future electric or hybrid-electric vehicles. However making them safer, cost effective and environment friendly is the key challenge. In this regard, replacing petro-derived materials by introducing renewable biomass derived cellulose derivatives and lignin based materials into the battery system is a promising approach for the development of green materials for LIB. These biomaterials introduce sustainability as well as improved safety in the final disposal of LIB batteries. In this review we introduce LIB materials technology in brief and recent developments in electrodes and binders based on cellulose and their derivatives and lignin for lithium ion batteries.
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Affiliation(s)
- Trupti C Nirmale
- Centre for Materials for Electronic Technology (C-MET), under DeitY, Panchawati Off Pashan Road, Pune 411008, India
| | - Bharat B Kale
- Centre for Materials for Electronic Technology (C-MET), under DeitY, Panchawati Off Pashan Road, Pune 411008, India
| | - Anjani J Varma
- School of Chemical Sciences, Central University of Haryana, Mahendragarh, Haryana 123031, India; Polymer Science & Engineering Division, CSIR-National Chemical Laboratory, Pune 411008, India.
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38
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Thakur UK, Kisslinger R, Shankar K. One-Dimensional Electron Transport Layers for Perovskite Solar Cells. NANOMATERIALS (BASEL, SWITZERLAND) 2017; 7:E95. [PMID: 28468280 PMCID: PMC5449976 DOI: 10.3390/nano7050095] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Revised: 04/03/2017] [Accepted: 04/24/2017] [Indexed: 12/05/2022]
Abstract
The electron diffusion length (Ln) is smaller than the hole diffusion length (Lp) in many halide perovskite semiconductors meaning that the use of ordered one-dimensional (1D) structures such as nanowires (NWs) and nanotubes (NTs) as electron transport layers (ETLs) is a promising method of achieving high performance halide perovskite solar cells (HPSCs). ETLs consisting of oriented and aligned NWs and NTs offer the potential not merely for improved directional charge transport but also for the enhanced absorption of incoming light and thermodynamically efficient management of photogenerated carrier populations. The ordered architecture of NW/NT arrays affords superior infiltration of a deposited material making them ideal for use in HPSCs. Photoconversion efficiencies (PCEs) as high as 18% have been demonstrated for HPSCs using 1D ETLs. Despite the advantages of 1D ETLs, there are still challenges that need to be overcome to achieve even higher PCEs, such as better methods to eliminate or passivate surface traps, improved understanding of the hetero-interface and optimization of the morphology (i.e., length, diameter, and spacing of NWs/NTs). This review introduces the general considerations of ETLs for HPSCs, deposition techniques used, and the current research and challenges in the field of 1D ETLs for perovskite solar cells.
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Affiliation(s)
- Ujwal K Thakur
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
| | - Ryan Kisslinger
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
| | - Karthik Shankar
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
- National Research Council, National Institute for Nanotechnology, 11421 Saskatchewan Drive NW, Edmonton, AB T6G 2M9, Canada.
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39
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Zhang Y, Wang Q, Zhang J, Wu X, Ma Y. An immutable array of TiO 2 nanotubes to pressures over 30 GPa. NANOTECHNOLOGY 2017; 28:145705. [PMID: 28206983 DOI: 10.1088/1361-6528/aa60fb] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report the successful formation of an immutable array of α-PbO2 phase TiO2 nanotubes by compression of a TiO2 nanotube array in an anatase phase. During compression to 31.3 GPa, the TiO2 nanotubes started to directly transform from an anatase phase to a baddeleyite phase at 14.5 GPa and completed the transition at 30.1 GPa. Under decompression, the baddeleyite phase transformed to an α-PbO2 phase at 4.6 GPa, which was quenchable to ambient pressure. Notably the tubular array microstructure was retained after the application of ultra high pressure and undergoing a series of phase transformations. Measurements indicated that the nanotubes in the array possessed higher compressibility than in the bulk form. The highly aligned array structure is believed to reinforce the nanotubes themselves, giving exceptional stability. This, as well as the wall thickness, may also account for their different phase transition pathway.
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Affiliation(s)
- Yanyan Zhang
- Center for High Pressure Science and Technology Advanced Research, Changchun, 130012, People's Republic of China
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40
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Significant improvement in Mn 2O 3 transition metal oxide electrical conductivity via high pressure. Sci Rep 2017; 7:44078. [PMID: 28276479 PMCID: PMC5343433 DOI: 10.1038/srep44078] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 02/02/2017] [Indexed: 01/08/2023] Open
Abstract
Highly efficient energy storage is in high demand for next-generation clean energy applications. As a promising energy storage material, the application of Mn2O3 is limited due to its poor electrical conductivity. Here, high-pressure techniques enhanced the electrical conductivity of Mn2O3 significantly. In situ synchrotron micro X-Ray diffraction, Raman spectroscopy and resistivity measurement revealed that resistivity decreased with pressure and dramatically dropped near the phase transition. At the highest pressure, resistivity reduced by five orders of magnitude and the sample showed metal-like behavior. More importantly, resistivity remained much lower than its original value, even when the pressure was fully released. This work provides a new method to enhance the electronic properties of Mn2O3 using high-pressure treatment, benefiting its applications in energy-related fields.
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41
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Yang S, Su HC, Hou JL, Luo W, Zou DH, Zhu QY, Dai J. The effects of transition-metal doping and chromophore anchoring on the photocurrent response of titanium-oxo-clusters. Dalton Trans 2017; 46:9639-9645. [DOI: 10.1039/c7dt01603d] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Titanium oxo-clusters with both doped metals and anchored chromophores were synthesized and characterized. The photocurrent densities of the clusters were improved by redox active metals and charge transfer chromophores.
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Affiliation(s)
- Shen Yang
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- People's Republic of China
| | - Hu-Chao Su
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- People's Republic of China
| | - Jin-Le Hou
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- People's Republic of China
| | - Wen Luo
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- People's Republic of China
| | - Dan-Hong Zou
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- People's Republic of China
| | - Qin-Yu Zhu
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- People's Republic of China
| | - Jie Dai
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- People's Republic of China
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Wrana D, Rodenbücher C, Krawiec M, Jany BR, Rysz J, Ermrich M, Szot K, Krok F. Tuning the surface structure and conductivity of niobium-doped rutile TiO2 single crystals via thermal reduction. Phys Chem Chem Phys 2017; 19:30339-30350. [DOI: 10.1039/c7cp03136j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report on the systematic exploration of electronic and structural changes of Nb-doped rutile TiO2(110) single crystal surfaces due to the thermoreduction under ultra-high vacuum conditions (without sputtering), with comparison to undoped TiO2(110) crystals.
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Affiliation(s)
- D. Wrana
- Marian Smoluchowski Institute of Physics
- Jagiellonian University
- 30-348 Krakow
- Poland
| | - C. Rodenbücher
- Peter Grünberg Institute and JARA-FIT
- Forschungszentrum Jülich GmbH
- 52425 Jülich
- Germany
| | - M. Krawiec
- Institute of Physics
- Maria Curie-Sklodowska University
- 20-031 Lublin
- Poland
| | - B. R. Jany
- Marian Smoluchowski Institute of Physics
- Jagiellonian University
- 30-348 Krakow
- Poland
| | - J. Rysz
- Marian Smoluchowski Institute of Physics
- Jagiellonian University
- 30-348 Krakow
- Poland
| | - M. Ermrich
- Röntgenlabor Dr. Ermrich
- D – 64354 Reinheim
- Germany
| | - K. Szot
- Peter Grünberg Institute and JARA-FIT
- Forschungszentrum Jülich GmbH
- 52425 Jülich
- Germany
- A. Chełkowski Institute of Physics
| | - F. Krok
- Marian Smoluchowski Institute of Physics
- Jagiellonian University
- 30-348 Krakow
- Poland
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43
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Kong L, Wang C, Wan F, Li L, Zhang X, Liu Y. Transparent Nb-doped TiO2 films with the [001] preferred orientation for efficient photocatalytic oxidation performance. Dalton Trans 2017; 46:15363-15372. [DOI: 10.1039/c7dt03057f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
[001]-Oriented Nb-TiO2 films via topotactic transformation from [100]-oriented Nb-TiN exhibit efficient photoactivity due to highly-reactive-facet exposure and increased surface-reactive sites.
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Affiliation(s)
- Lina Kong
- Institute of Material Physics
- Key Laboratory of Display Materials and Photoelectric Devices of Ministry of Education
- Key Laboratory for Optoelectronic Materials and Devices of Tianjin
- College of Materials Science and Engineering
- Tianjin University of Technology
| | - Changhua Wang
- Center for Advanced Optoelectronic Functional Materials Research
- and Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education
- Northeast Normal University
- Changchun 130024
- China
| | - Fangxu Wan
- Center for Advanced Optoelectronic Functional Materials Research
- and Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education
- Northeast Normal University
- Changchun 130024
- China
| | - Lan Li
- Institute of Material Physics
- Key Laboratory of Display Materials and Photoelectric Devices of Ministry of Education
- Key Laboratory for Optoelectronic Materials and Devices of Tianjin
- College of Materials Science and Engineering
- Tianjin University of Technology
| | - Xintong Zhang
- Center for Advanced Optoelectronic Functional Materials Research
- and Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education
- Northeast Normal University
- Changchun 130024
- China
| | - Yichun Liu
- Center for Advanced Optoelectronic Functional Materials Research
- and Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education
- Northeast Normal University
- Changchun 130024
- China
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44
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Molybdenum disulfide grafted titania nanotube arrays as high capacity retention anode material for lithium ion batteries. APPLIED NANOSCIENCE 2016. [DOI: 10.1007/s13204-016-0543-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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45
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Lü X, Wang Y, Stoumpos CC, Hu Q, Guo X, Chen H, Yang L, Smith JS, Yang W, Zhao Y, Xu H, Kanatzidis MG, Jia Q. Enhanced Structural Stability and Photo Responsiveness of CH 3 NH 3 SnI 3 Perovskite via Pressure-Induced Amorphization and Recrystallization. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:8663-8668. [PMID: 27514760 DOI: 10.1002/adma.201600771] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 07/07/2016] [Indexed: 05/18/2023]
Abstract
An organic-inorganic halide CH3 NH3 SnI3 perovskite with significantly improved structural stability is obtained via pressure-induced amorphization and recrystallization. In situ high-pressure resistance measurements reveal an increased electrical conductivity by 300% in the pressure-treated perovskite. Photocurrent measurements also reveal a substantial enhancement in visible-light responsiveness. The mechanism underlying the enhanced properties is shown to be associated with the pressure-induced structural modification.
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Affiliation(s)
- Xujie Lü
- Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Yonggang Wang
- High Pressure Science and Engineering Center (HiPSEC), University of Nevada Las Vegas, Las Vegas, NV, 89154, USA
- High Pressure Synergetic Consortium (HPSynC), Carnegie Institution of Washington, Argonne, IL, 60439, USA
| | | | - Qingyang Hu
- Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, 20015, USA
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai, 201203, China
| | - Xiaofeng Guo
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Haijie Chen
- Department of Chemistry, Northwestern University, Evanston, IL, 60208, USA
| | - Liuxiang Yang
- High Pressure Synergetic Consortium (HPSynC), Carnegie Institution of Washington, Argonne, IL, 60439, USA
| | - Jesse S Smith
- High Pressure Collaborative Access Team (HPCAT), Carnegie Institution of Washington, Argonne, IL, 60439, USA
| | - Wenge Yang
- High Pressure Synergetic Consortium (HPSynC), Carnegie Institution of Washington, Argonne, IL, 60439, USA
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai, 201203, China
| | - Yusheng Zhao
- High Pressure Science and Engineering Center (HiPSEC), University of Nevada Las Vegas, Las Vegas, NV, 89154, USA.
- Department of Physics, Southern University of Science and Technology, Shenzhen, 518055, China.
| | - Hongwu Xu
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.
| | | | - Quanxi Jia
- Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.
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46
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Lü X, Chen A, Luo Y, Lu P, Dai Y, Enriquez E, Dowden P, Xu H, Kotula PG, Azad AK, Yarotski DA, Prasankumar RP, Taylor AJ, Thompson JD, Jia Q. Conducting Interface in Oxide Homojunction: Understanding of Superior Properties in Black TiO2. NANO LETTERS 2016; 16:5751-5755. [PMID: 27482629 DOI: 10.1021/acs.nanolett.6b02454] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Black TiO2 nanoparticles with a crystalline core and amorphous-shell structure exhibit superior optoelectronic properties in comparison with pristine TiO2. The fundamental mechanisms underlying these enhancements, however, remain unclear, largely due to the inherent complexities and limitations of powder materials. Here, we fabricate TiO2 homojunction films consisting of an oxygen-deficient amorphous layer on top of a highly crystalline layer, to simulate the structural/functional configuration of black TiO2 nanoparticles. Metallic conduction is achieved at the crystalline-amorphous homointerface via electronic interface reconstruction, which we show to be the main reason for the enhanced electron transport of black TiO2. This work not only achieves an unprecedented understanding of black TiO2 but also provides a new perspective for investigating carrier generation and transport behavior at oxide interfaces, which are of tremendous fundamental and technological interest.
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Affiliation(s)
- Xujie Lü
- Materials Physics and Applications Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
- Earth and Environmental Sciences Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Aiping Chen
- Materials Physics and Applications Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Yongkang Luo
- Materials Physics and Applications Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Ping Lu
- Sandia National Laboratories , Albuquerque, New Mexico 87185, United States
| | - Yaomin Dai
- Materials Physics and Applications Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Erik Enriquez
- Materials Physics and Applications Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Paul Dowden
- Materials Physics and Applications Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Hongwu Xu
- Earth and Environmental Sciences Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Paul G Kotula
- Sandia National Laboratories , Albuquerque, New Mexico 87185, United States
| | - Abul K Azad
- Materials Physics and Applications Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Dmitry A Yarotski
- Materials Physics and Applications Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Rohit P Prasankumar
- Materials Physics and Applications Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Antoinette J Taylor
- Materials Physics and Applications Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Joe D Thompson
- Materials Physics and Applications Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Quanxi Jia
- Materials Physics and Applications Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
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47
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Lai X, Liu Y, Lü X, Zhang S, Bu K, Jin C, Zhang H, Lin J, Huang F. Suppression of superconductivity and structural phase transitions under pressure in tetragonal FeS. Sci Rep 2016; 6:31077. [PMID: 27498699 PMCID: PMC4976363 DOI: 10.1038/srep31077] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 07/14/2016] [Indexed: 11/20/2022] Open
Abstract
Pressure is a powerful tool to study iron-based superconductors. Here, we report systematic high-pressure transport and structural characterizations of the newly discovered superconductor FeS. It is found that superconductor FeS (tetragonal) partly transforms to a hexagonal structure at 0.4 GPa, and then completely transforms to an orthorhombic phase at 7.4 GPa and finally to a monoclinic phase above 9.0 GPa. The superconducting transition temperature of tetragonal FeS was gradually depressed by pressure, different from the case in tetragonal FeSe. With pressure increasing, the S-Fe-S angles only slightly change but the anion height deviates farther from 1.38 Å. This change of anion height, together with the structural instability under pressure, should be closely related to the suppression of superconductivity. We also observed an anomalous metal-semiconductor transition at 6.0 GPa and an unusual increased resistance with further compression above 9.6 GPa. The former can be ascribed to the tetragonal-orthorhombic structural phase transition, and the latter to the electronic structure changes of the high-pressure monoclinic phase. Finally, a phase diagram of tetragonal FeS as functions of pressure and temperature was mapped out for the first time, which will shed new light on understanding of the structure and physics of the superconducting FeS.
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Affiliation(s)
- Xiaofang Lai
- Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Ying Liu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Xujie Lü
- Earth and Environmental Sciences Division and Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States
| | - Sijia Zhang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Kejun Bu
- CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
| | - Changqing Jin
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.,Collaborative Innovation Center of Quantum Matter, Beijing, China
| | - Hui Zhang
- CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
| | - Jianhua Lin
- Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Fuqiang Huang
- Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.,CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
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48
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Wu Y, Liu X, Yang Z, Gu L, Yu Y. Nitrogen-Doped Ordered Mesoporous Anatase TiO2 Nanofibers as Anode Materials for High Performance Sodium-Ion Batteries. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:3522-9. [PMID: 27185585 DOI: 10.1002/smll.201600606] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 03/24/2016] [Indexed: 05/12/2023]
Abstract
Nitrogen-doped ordered mesoporous TiO2 nanofibers (N-MTO) have been fabricated by electrospinning and subsequent nitridation treatment. The N-doping in TiO2 leads to the formation of Ti(3+) , resulting in the improved electron conductivity of TiO2 . In addition, one-dimensional (1D) N-MTO nanostructure possesses very short diffusion length of Na(+) /e(-) in N-MTO, easy access of electrolyte, and high conductivity transport of electrons along the percolating fibers. The N-MTO shows excellent sodium storage performance.
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Affiliation(s)
- Ying Wu
- Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences (CAS), Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin, 300071, China
- State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Xiaowu Liu
- Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences (CAS), Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Zhenzhong Yang
- Beijing Laboratory for Electron Microscopy, Institute of Physics, Chinese Academy of Sciences (CAS), Beijing, 100190, China
| | - Lin Gu
- Beijing Laboratory for Electron Microscopy, Institute of Physics, Chinese Academy of Sciences (CAS), Beijing, 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing, 100190, China
| | - Yan Yu
- Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences (CAS), Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin, 300071, China
- State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui, 230026, China
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49
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The behaviors of anatase and TiO2(B) phase coexisting nanosheets under high pressure. Radiat Phys Chem Oxf Engl 1993 2016. [DOI: 10.1016/j.radphyschem.2015.11.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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50
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Wang A, Zhou Y, Wang Z, Chen M, Sun L, Liu X. Titanium incorporated with UiO-66(Zr)-type Metal–Organic Framework (MOF) for photocatalytic application. RSC Adv 2016. [DOI: 10.1039/c5ra24135a] [Citation(s) in RCA: 117] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Dual function of the adsorption and photodegradation for the methylene blue removal over the UiO-66(Ti) nanocomposites.
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Affiliation(s)
- Aoning Wang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)
- National Jiangsu Synergistic Innovation Center for Advanced Materials (SICAM)
- Nanjing Tech University (Nanjing Tech)
- Nanjing
- China
| | - Yingjie Zhou
- School of Physics and Optoelectronic Engineering
- Nanjing University of Information Science & Technology
- Nanjing
- China
| | - Zhoulu Wang
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)
- National Jiangsu Synergistic Innovation Center for Advanced Materials (SICAM)
- Nanjing Tech University (Nanjing Tech)
- Nanjing
- China
| | - Miao Chen
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)
- National Jiangsu Synergistic Innovation Center for Advanced Materials (SICAM)
- Nanjing Tech University (Nanjing Tech)
- Nanjing
- China
| | - Luyi Sun
- Department of Chemical & Biomolecular Engineering and Polymer Program
- Institute of Materials Science
- University of Connecticut
- Storrs
- USA
| | - Xiang Liu
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)
- National Jiangsu Synergistic Innovation Center for Advanced Materials (SICAM)
- Nanjing Tech University (Nanjing Tech)
- Nanjing
- China
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