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SanaUllah I, Khan S, Ali D, Sajjad A, Shamaila S, Kanwal Z, Sabri AN, Atiq S, Naseem S, Riaz S. Investigation and optimization of In-Vitro behaviour of Perovskite barium titanate as a scaffold and protective coatings. J Mech Behav Biomed Mater 2024; 149:106215. [PMID: 37984284 DOI: 10.1016/j.jmbbm.2023.106215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 10/26/2023] [Accepted: 10/28/2023] [Indexed: 11/22/2023]
Abstract
The piezoelectric effect is widely known to have a significant physiological function in bone development, remodeling, and fracture repair. As a well-known piezoelectric material, barium titanate is particularly appealing as a scaffold layer to improve bone tissue engineering applications. Currently, the chemical bath deposition method is used to prepare green synthesized barium titanate coatings to improve mechanical and biological characteristics. Molarity of the solutions, an essential parameter in chemical synthesis, is changed at room temperature (0.1-1.2 Molar) to prepare coatings. The XRD spectra for as deposited coatings indicate amorphous behavior, while polycrystalline nature of coatings is observed after annealing (300 °C). Coatings prepared with solutions of relatively low molarities, i.e. from 0.1 to 0.8 M, exhibit mixed tetragonal - cubic phases. However, the tetragonal phase of Perovskite barium titanate is observed using solution molarities of 1.0 M and 1.2 M. Relatively high value of transmission, i.e. ∼80%, is observed for the coatings prepared with high molarities. Band gap of annealed coatings varies between 3.47 and 3.70 eV. For 1.2 M sample, the maximum spontaneous polarization (Ps) is 0.327x10-3 (μC/cm2) and the residual polarization (Pr) is 0.072x10-3 (μC/cm2). For 1.2M solution, a high hardness value (1510 HV) is recorded, with a fracture toughness of 28.80 MPam-1/2. Low values of weight loss, after dipping the coatings in simulated body fluid, is observed. The antibacterial activity of BaTiO3 is tested against E. coli and Bacillus subtilis. Drug encapsulation capability is also tested for different time intervals. As a result, CBD-based coatings are a promising nominee for use as scaffold and protective coatings.
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Affiliation(s)
- Ifra SanaUllah
- Centre of Excellence in Solid State Physics, University of the Punjab, Lahore, Pakistan
| | - Sidra Khan
- Centre of Excellence in Solid State Physics, University of the Punjab, Lahore, Pakistan
| | - Daoud Ali
- Department of Zoology, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Amna Sajjad
- Department of Zoology, Government College University, Faisalabad, Pakistan
| | - S Shamaila
- Waterloo Institute for Nanotechnology, University of Waterloo, Ontario, Canada
| | - Zakia Kanwal
- Department of Zoology, Lahore College for Women University, Lahore, Pakistan
| | - Anjum N Sabri
- Department of Microbiology and Molecular Genetics, University of the Punjab, Lahore, Pakistan
| | - Shahid Atiq
- Centre of Excellence in Solid State Physics, University of the Punjab, Lahore, Pakistan
| | - Shahzad Naseem
- Centre of Excellence in Solid State Physics, University of the Punjab, Lahore, Pakistan
| | - Saira Riaz
- Centre of Excellence in Solid State Physics, University of the Punjab, Lahore, Pakistan.
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Zhang M, Duan X, Gao Y, Zhang S, Lu X, Luo K, Ye J, Wang X, Niu Q, Zhang P, Dai S. Tuning Oxygen Vacancies in Oxides by Configurational Entropy. ACS APPLIED MATERIALS & INTERFACES 2023; 15:45774-45789. [PMID: 37740720 DOI: 10.1021/acsami.3c07268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/25/2023]
Abstract
Tuning surface oxygen vacancies is important for oxide catalysts. Doping elements with different chemical valence states or different atomic radii into host oxides is a common method to create oxygen vacancies. However, the concentration of oxygen vacancies in oxide catalysts is still limited to the amount of foreign dopants that can be tolerated (generally less than 10% atoms). Herein, a principle of engineering the configurational entropy to tune oxygen vacancies was proposed. First, the positive relationship between the configuration entropy and the formation energy of oxygen vacancies (Eov) in 16 model oxides was estimated by a DFT calculation. To verify this, single binary oxides and high-entropy quinary oxides (HEOs) were prepared. Indeed, the concentration of oxygen vacancies in HEOs (Oβ/α = 3.66) was higher compared to those of single or binary oxides (Oβ/α = 0.22-0.75) by O1s XPS, O2-TPD, and EPR. Interestingly, the reduction temperatures of transition metal ions in HEOs were generally lower than that in single-metal oxides by H2-TPR. The lower Eov of HEOs may contribute to this feature, which was confirmed by in situ XPS and in situ XRD. Moreover, with catalytic CO/C3H6 oxidation as a model, the high-entropy (MnCuCo3NiFe)xOy catalyst showed higher catalytic activity than single and binary oxides, which experimentally verified the hypothesis of the DFT calculation. This work may inspire more oxide catalysts with preferred oxygen vacancies.
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Affiliation(s)
- Mengyuan Zhang
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xiaolan Duan
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Ying Gao
- State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
| | - Shuangshuang Zhang
- State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
| | - Xiaoyan Lu
- State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
| | - Kongliang Luo
- State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
| | - Jian Ye
- State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
| | - Xiaopeng Wang
- State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
| | - Qiang Niu
- National Enterprise Technology Center, Inner Mongolia Erdos Electric Power and Metallurgy Group Co., Ltd., Ordos 016064, Inner Mongolia, China
| | - Pengfei Zhang
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
- State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
| | - Sheng Dai
- Chemical Science Division, Oak Ridge National Laboratory, Oak Ridge 37830, Tennessee, United States
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Wang X, Ma S, Liu B, Wang S, Huang W. Imperfect makes perfect: defect engineering of photoelectrodes towards efficient photoelectrochemical water splitting. Chem Commun (Camb) 2023; 59:10044-10066. [PMID: 37551587 DOI: 10.1039/d3cc02843g] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
Photoelectrochemical (PEC) water splitting for hydrogen evolution has been considered as a promising technology to solve the energy and environmental issues. However, the solar-to-hydrogen (STH) conversion efficiencies of current PEC systems are far from meeting the commercial demand (10%) due to the lack of efficient photoelectrode materials. The recent rapid development of defect engineering of photoelectrodes has significantly improved the PEC performance, which is expected to break through the bottleneck of low STH efficiency. In this review, the category and the construction methods of different defects in photoelectrode materials are summarized. Based on the in-depth summary and analysis of existing reports, the PEC performance enhancement mechanism of defect engineering is critically discussed in terms of light absorption, carrier separation and transport, and surface redox reactions. Finally, the application prospects and challenges of defect engineering for PEC water splitting are presented, and the future research directions in this field are also proposed.
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Affiliation(s)
- Xin Wang
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China.
| | - Siqing Ma
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China.
| | - Boyan Liu
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China.
| | - Songcan Wang
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China.
| | - Wei Huang
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China.
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Yang X, Fernández-Carrión AJ, Kuang X. Oxide Ion-Conducting Materials Containing Tetrahedral Moieties: Structures and Conduction Mechanisms. Chem Rev 2023; 123:9356-9396. [PMID: 37486716 DOI: 10.1021/acs.chemrev.2c00913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
This Review presents an overview from the perspective of tetrahedral chemistry on various oxide ion-conducting materials containing tetrahedral moieties which have received continuous growing attention as candidates for key components of various devices, including solid oxide fuel cells and oxygen sensors, due to the deformation and rotation flexibility of tetrahedral units facilitating oxide ion transport. Emphasis is placed on the structural and mechanistic features of various systems ranging from crystalline to amorphous materials, which include a variety of gallates, silicates, germanates, molybdates, tungstates, vanadates, aluminates, niobate, titanates, indium oxides, and the newly reported borates. They contain tetrahedral units in either isolated or linked manners forming different polyhedral dimensionality (0 to 3) with various defect properties and transport mechanisms. The development of oxide ion conductors containing tetrahedral moieties and the elucidation of the roles of tetrahedral units in oxide ion migration have demonstrated diverse opportunities for discovering superior electrolytes for solid oxide fuel cells and other related devices and provided useful clues for uncovering the key factors directing fast oxide ion conduction.
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Affiliation(s)
- Xiaoyan Yang
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Alberto J Fernández-Carrión
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Xiaojun Kuang
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, P. R. China
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Wu Y, Jiang P, Yang T. Rational design, crystal structure, and frustrated magnetism of the Ge-containing YbFe 2O 4-type layered oxides In 2Zn 3-xCo xGeO 8 (0 ≤ x ≤ 3). Dalton Trans 2023. [PMID: 37365940 DOI: 10.1039/d3dt01293j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/28/2023]
Abstract
YbFe2O4-type layered oxides have attracted tremendous interest because the unique crystal comprises two distinct geometrically frustrated triangular cation-sublattices. Herein, a series of YbFe2O4-type materials In2Zn3-xCoxGeO8 (0 ≤ x ≤ 3) were rationally designed and experimentally synthesized for the first time. The crystal structures of In2Zn3-xCoxGeO8 were investigated comprehensively by Rietveld refinements against high-resolution monochromatic Cu Kα1 XRD data. Zn2+, Co2+, and Ge4+ cations are distributed randomly on the [MO]2 bilayer and possess a trigonal bipyramid (TBP) coordination geometry. Because Co2+ has an unpaired electron in the dz2 orbital and a larger electronegativity than Zn2+, Co2+-to-Zn2+ equivalent substitution in In2Zn3-xCoxGeO8 results in more compact MO5-TBPs, which is the origin of anisotropic lattice expansion and contraction along the a and c axes, respectively. The Co2+ moments in the [MO]2 bilayer are strongly AFM coupled and geometrically frustrated, therefore resulting in a spin-glass magnetic transition at around Tg = 20 K for In2ZnCo2GeO8, while a long-range AFM ordering is established for In2Co3GeO8 with a Néel temperature of 53 K, attributed to the significantly enhanced AFM interactions and increased In3+/Co2+ anti-site disordering, as compared to those in In2ZnCo2GeO8.
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Affiliation(s)
- Yuhan Wu
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China.
| | - Pengfei Jiang
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China.
| | - Tao Yang
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China.
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Yasui Y, Tansho M, Fujii K, Sakuda Y, Goto A, Ohki S, Mogami Y, Iijima T, Kobayashi S, Kawaguchi S, Osaka K, Ikeda K, Otomo T, Yashima M. Hidden chemical order in disordered Ba 7Nb 4MoO 20 revealed by resonant X-ray diffraction and solid-state NMR. Nat Commun 2023; 14:2337. [PMID: 37095089 PMCID: PMC10126145 DOI: 10.1038/s41467-023-37802-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Accepted: 03/30/2023] [Indexed: 04/26/2023] Open
Abstract
The chemical order and disorder of solids have a decisive influence on the material properties. There are numerous materials exhibiting chemical order/disorder of atoms with similar X-ray atomic scattering factors and similar neutron scattering lengths. It is difficult to investigate such order/disorder hidden in the data obtained from conventional diffraction methods. Herein, we quantitatively determined the Mo/Nb order in the high ion conductor Ba7Nb4MoO20 by a technique combining resonant X-ray diffraction, solid-state nuclear magnetic resonance (NMR) and first-principle calculations. NMR provided direct evidence that Mo atoms occupy only the M2 site near the intrinsically oxygen-deficient ion-conducting layer. Resonant X-ray diffraction determined the occupancy factors of Mo atoms at the M2 and other sites to be 0.50 and 0.00, respectively. These findings provide a basis for the development of ion conductors. This combined technique would open a new avenue for in-depth investigation of the hidden chemical order/disorder in materials.
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Affiliation(s)
- Yuta Yasui
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Masataka Tansho
- NMR Station, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan
| | - Kotaro Fujii
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Yuichi Sakuda
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Atsushi Goto
- NMR Station, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan
| | - Shinobu Ohki
- NMR Station, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan
| | - Yuuki Mogami
- NMR Station, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan
| | - Takahiro Iijima
- Institute of Arts and Sciences, Yamagata University, 1-4-12 Kojirakawa-machi, Yamagata, Yamagata, 990-8560, Japan
| | - Shintaro Kobayashi
- Diffraction and Scattering Division, Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan
| | - Shogo Kawaguchi
- Diffraction and Scattering Division, Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan
| | - Keiichi Osaka
- Industrial Application and Partnership Division, Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan
| | - Kazutaka Ikeda
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 203-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
- J-PARC Center, High Energy Accelerator Research Organization (KEK), 2-4 Shirakata-Shirane, Tokai, Ibaraki, 319-1106, Japan
- School of High Energy Accelerator Science, The Graduate University for Advanced Studies, 203-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
| | - Toshiya Otomo
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 203-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
- J-PARC Center, High Energy Accelerator Research Organization (KEK), 2-4 Shirakata-Shirane, Tokai, Ibaraki, 319-1106, Japan
- School of High Energy Accelerator Science, The Graduate University for Advanced Studies, 203-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
- Graduate School of Science and Engineering, Ibaraki University, 162-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
| | - Masatomo Yashima
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan.
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Wang J, Bai J, Zhang Y, Li L, Zhou C, Zhou T, Li J, Zhu H, Zhou B. Unconventional Substitution for BiVO 4 to Enhance Photoelectrocatalytic Performance by Accelerating Polaron Hopping. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 36882910 DOI: 10.1021/acsami.2c23169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Bismuth vanadate (BiVO4) as a fascinating semiconductor for photoelectrocatalytic (PEC) water oxidation with suitable band gap (Eg) has been limited by the issue of poor separation and transportation of charge carriers. Herein, we propose an unconventional substitution of V5+ sites by Ti4+ in BiVO4 (Ti:BiVO4) for the similar ionic radii and accelerated polaron hopping. Ti:BiVO4 increased the photocurrent density 1.90 times up to 2.51 mA cm-2 at 1.23 V vs RHE and increased the charge carrier density 1.81 times to 5.86 × 1018 cm-3. Compared with bare BiVO4, Ti:BiVO4 improves the bulk separation efficiency to 88.3% at 1.23 V vs RHE. The DFT calculations have illustrated that Ti-doping modification could decrease the polaron hopping energy barrier, narrow the Eg, and decrease the overpotential of the oxygen evolution reaction (OER) concurrently. With further spin-coated FeOOH cocatalyst, the photoanode has a photocurrent density of 3.99 mA cm-2 at 1.23 V vs RHE. The excellent PEC performance of FeOOH/Ti:BiVO4 is attributed to the synergistic effect of the FeOOH layer and Ti doping, which could promote charge carrier separation and transfer by expediting polaron migration.
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Affiliation(s)
- Jiachen Wang
- School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Jing Bai
- School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Yan Zhang
- School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Lei Li
- School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Changhui Zhou
- School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Tingsheng Zhou
- School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Jinhua Li
- School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Hong Zhu
- University of Michigan─Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Baoxue Zhou
- School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, Shanghai 200240, P. R. China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, P. R. China
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Wang J, Zhang Y, Bai J, Li J, Zhou C, Li L, Xie C, Zhou T, Zhu H, Zhou B. Ni doped amorphous FeOOH layer as ultrafast hole transfer channel for enhanced PEC performance of BiVO4. J Colloid Interface Sci 2023; 644:509-518. [PMID: 37019742 DOI: 10.1016/j.jcis.2023.03.162] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 03/14/2023] [Accepted: 03/25/2023] [Indexed: 03/31/2023]
Abstract
Bismuth vanadate (BiVO4), as the potential and prospective photocatalyst, has been limited by the issue of poor separation and transfer of charge carrier for photoelectrocatalytic (PEC) water oxidation. Here, a significant increase of surface injection efficiency for BiVO4 is realized by the rationally designed Ni doped FeOOH (Ni:FeOOH) layer growing on BiVO4 photoanode (Ni:FeOOH/BiVO4), in which doped Ni2+ can induce partial-charge of FeOOH to serve as ultrafast transfer channel for hole transfer and transportation at the semiconductor/electrolyte interface. In addition, the Ni:FeOOH/BiVO4 shows the ηsurface value of 81.6 %, which is 3.28-fold and 1.47-fold of BiVO4 and FeOOH/BiVO4, respectively. The photocurrent density of Ni:FeOOH/BiVO4 is 4.21 mA cm-2 at 1.23 V vs. RHE, with the onset potential cathodically shifting 237 mV over BiVO4 and a long-term stability for suppressing surface charge recombination. The UPS and UV-Vis spectra have confirmed the type-II band alignment between Ni:FeOOH and BiVO4 for promoting carrier transfer. This facile and effective spin-coating method could deposit oxygen evolution catalysts (OECs) availably onto photoanodes with enhanced PEC water splitting.
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Wang Y, An Z, Tao Z, Zhang S, Yang X, Kuang X, Ye S. Thermodynamics and Kinetics Accounting for Antithermal Quenching of Luminescence in Sc 2(MoO 4) 3: Yb/Er: Perspective beyond Negative Thermal Expansion. J Phys Chem Lett 2022; 13:12032-12040. [PMID: 36541874 DOI: 10.1021/acs.jpclett.2c03449] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Defects are common in inorganic materials and not static upon annealing of the heat effect. Antithermal quenching of luminescence in phosphors may be ascribed to the migration of defects and/or ions, which has not been well-studied. Herein, we investigate the antithermal quenching mechanism of upconversion luminescence in Sc2(MoO4)3: 9%Yb1%Er with negative thermal expansion via a fresh perspective on thermodynamics and kinetics, concerning the thermally activated movement of defects and/or ions. Our results reveal a second-order phase transition taking place at ∼573 K induced by oxide-ion migration. The resulting variation of the thermodynamics and kinetics of the host lattice owing to the thermally induced oxide-ion movement contributes to a more suppressed nonradiative decay rate. The dynamic defects no longer act as quenching centers with regard to the time scale during which they stay nearby the Yb3+/Er3+ site in our proposed model. This research opens an avenue for understanding the antithermal quenching mechanism of luminescence via thermodynamics and kinetics.
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Affiliation(s)
- Yinghan Wang
- State Key Lab of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Engineering, South China University of Technology, Guangzhou510641, China
| | - Zhengce An
- State Key Lab of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Engineering, South China University of Technology, Guangzhou510641, China
| | - Zhengren Tao
- State Key Lab of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Engineering, South China University of Technology, Guangzhou510641, China
| | - Shuai Zhang
- State Key Lab of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Engineering, South China University of Technology, Guangzhou510641, China
| | - Xiaoyan Yang
- Guangxi Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory of Processing for Nonferrous Metal and Featured Materials, College of Materials Science and Engineering, Guilin University of Technology, Guilin541004, China
| | - Xiaojun Kuang
- Guangxi Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory of Processing for Nonferrous Metal and Featured Materials, College of Materials Science and Engineering, Guilin University of Technology, Guilin541004, China
| | - Shi Ye
- State Key Lab of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Engineering, South China University of Technology, Guangzhou510641, China
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Zhang W, Yashima M. Recent developments in oxide ion conductors: focusing on Dion-Jacobson phases. Chem Commun (Camb) 2022; 59:134-152. [PMID: 36510789 DOI: 10.1039/d2cc05288a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Oxide-ion conductors, also known as "oxygen ion conductors," have garnered significant attention in recent years due to their extensive applications in a variety of electrochemical devices, including oxygen concentrators, solid-oxide fuel cells (SOFCs), and solid oxide electrolysis cells. The key to improving the performance of these devices is the creation of novel oxide-ion conductors. In this feature article, we discuss the recent developments of new structural families of oxide-ion conductors and of the Dion-Jacobson-type layered oxide-ion conductors with a particular emphasis on CsM2Ti2NbO10-δ (M = Bi and lanthanoids; δ represents oxygen-vacancy content) and their solid solutions. CsBi2Ti2NbO10-δ is the first example of an oxide-ion conductor with a Dion-Jacobson-type layered perovskite structure, and the structural characteristics of these materials are extracted here. We have proposed an original concept that the large sized Cs+ cations and M3+ displacements yield the large bottlenecks for oxide-ion migration, which would facilitate the discovery of novel oxide-ion conductors. This article presents evidence that Dion-Jacobson-type layered perovskites are superior oxide-ion conductors. We also demonstrate how the information gleaned from these studies can be applied to the design of novel oxide-ion conductors.
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Affiliation(s)
- Wenrui Zhang
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-17 O-okayama, Meguro-ku, Tokyo, 152-8551, Japan.
| | - Masatomo Yashima
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-17 O-okayama, Meguro-ku, Tokyo, 152-8551, Japan.
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11
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He Y, Sheng J, Ren Q, Sun Y, Hao W, Dong F. Operando Identification of Dynamic Photoexcited Oxygen Vacancies as True Catalytic Active Sites. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Ye He
- School of Resources and Environment & Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Jianping Sheng
- School of Resources and Environment & Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Qin Ren
- School of Resources and Environment & Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Yanjuan Sun
- School of Resources and Environment & Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Weichang Hao
- School of Physics and BUAA-UOW Joint Research Centre, Beihang University, Beijing 100191, China
| | - Fan Dong
- School of Resources and Environment & Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
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12
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Qin J, Jiang P, Lu G, Wang R, Yang T. Temperature-driven order-disorder structural transition in the oxygen sub-lattice and the complex superstructure of the high-temperature polymorph of CaSrZn 2Ga 2O 7. Dalton Trans 2022; 51:18549-18561. [PMID: 36444814 DOI: 10.1039/d2dt03145k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Structural order-disorder plays a decisive role in the physical properties of materials, such as magnetism, second-order harmonic generation, and ionic conductivity, and it is thus widely utilized to manipulate the crystal structure and understand structure-property correlations. Herein, we report the structural polymorphism, complex crystal structure and temperature-driven irreversible order-disorder phase transition of the polar oxides (Sr1-xCax)SrZn2Ga2O7. The low-temperature (LT) structure crystallizes in Pna21 with partial Zn/Ga ordering. Upon heating, (Sr1-xCax)SrZn2Ga2O7 undergoes an irreversible phase transition from orthorhombic Pna21 to hexagonal P63. Interestingly, the high-temperature (HT) P63 structure possesses an unexpected 3/2-fold superstructure rather than a substructure of the low-temperature (LT) Pna21 structure, which is a rare structural phenomenon in solid-state chemistry. This new HT superstructure is the most complex one in this series of oxides with 21 crystallographically independent sites determined accurately by a combination of the maximum entropy method and Rietveld refinement against high-resolution neutron powder diffraction data. In terms of the mechanism, this is a temperature-driven order-to-disorder transition in the oxygen sublattice. A careful structural analysis revealed that the oxygen disordering mainly occurs in the [SrO3] layers of the HT structure and it can be understood as respective clockwise and anticlockwise rotations of distinct GaO4-tetrahedra along the c-axis. Alternating current electrochemical impedance spectroscopic analysis revealed that the oxygen disordering in the HT structure is incapable of giving rise to oxide ionic conductivity but does lead to increased electronic conduction compared to the LT structure. The optical properties of the CaSrZn2Ga2O7 and Sr2Zn2Ga2O7 representatives are also investigated in-depth via diffuse reflectance spectroscopy and theoretic calculations.
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Affiliation(s)
- Jie Qin
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 401331, P. R. China.
| | - Pengfei Jiang
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 401331, P. R. China.
| | - Guangxiang Lu
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 401331, P. R. China.
| | - Rong Wang
- School of Metallurgy and Materials Engineering, Chongqing University of Science & Technology, Chongqing 401331, P. R. China
| | - Tao Yang
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 401331, P. R. China.
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13
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Wang J, Zhou T, Zhang Y, Li L, Zhou C, Bai J, Li J, Zhu H, Zhou B. Type-II Heterojunction CdIn 2S 4/BiVO 4 Coupling with CQDs to Improve PEC Water Splitting Performance Synergistically. ACS APPLIED MATERIALS & INTERFACES 2022; 14:45392-45402. [PMID: 36179059 DOI: 10.1021/acsami.2c12618] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Bismuth vanadate (BiVO4) has been considered as a promising photoelectrocatalytic (PEC) semiconductor, but suffers from severe hole recombination, attributed to the short hole-diffusion length and the low carrier mobility. Herein, a type-II heterojunction CdIn2S4/BiVO4 is designed to improve the photocurrent density from 1.22 (pristine BiVO4) to 2.68 mA cm-2 at 1.23 V vs the reversible hydrogen electrode (RHE), accelerating the bulk separation of photogenerated carriers by the built-in field from the matched energy band. With the introduction of CQDs, CQDs/CdIn2S4/BiVO4 increases the photocurrent density to 4.84 mA cm-2, enhancing the light absorption and cathodically shifting its onset potential, due to the synergetic effect of the heterojunction and CQDs. Compared with BiVO4, CQDs/CdIn2S4/BiVO4 promotes the bulk separation efficiency to 94.6% and the surface injection efficiency to 72.2%. Additionally, spin-coating of FeOOH on CQDs/CdIn2S4/BiVO4 could further improve the PEC performance and keep a long stability for water splitting. The density function theory (DFT) calculations illustrated that the type-II heterojunction CdIn2S4/BiVO4 could decrease the oxygen evolution reaction (OER) overpotential and accelerate bulk charge separation for the built-in field of the aligned band structure.
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Affiliation(s)
- Jiachen Wang
- School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, Shanghai200240, P. R. China
| | - Tingsheng Zhou
- School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, Shanghai200240, P. R. China
| | - Yan Zhang
- School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, Shanghai200240, P. R. China
| | - Lei Li
- School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, Shanghai200240, P. R. China
| | - Changhui Zhou
- School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, Shanghai200240, P. R. China
| | - Jing Bai
- School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, Shanghai200240, P. R. China
| | - Jinhua Li
- School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, Shanghai200240, P. R. China
| | - Hong Zhu
- University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai200240, P. R. China
| | - Baoxue Zhou
- School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, Shanghai200240, P. R. China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai200092, P. R. China
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14
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Fop S, Dawson JA, Tawse DN, Skellern MG, Skakle JMS, Mclaughlin AC. Proton and Oxide Ion Conductivity in Palmierite Oxides. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2022; 34:8190-8197. [PMID: 36193291 PMCID: PMC9523575 DOI: 10.1021/acs.chemmater.2c01218] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 08/22/2022] [Indexed: 06/16/2023]
Abstract
Solid proton and oxide ion conductors have key applications in several hydrogen-based and energy-related technologies. Here, we report on the discovery of significant proton and oxide ion conductivity in palmierite oxides A3V2O8 (A = Sr, Ba), which crystallize with a framework of isolated tetrahedral VO4 units. We show that these systems present prevalent ionic conduction, with a large protonic component under humidified air (t H ∼ 0.6-0.8) and high protonic mobility. In particular, the proton conductivity of Sr3V2O8 is 1.0 × 10-4 S cm-1 at 600 °C, competitive with the best proton conductors constituted by isolated tetrahedral units. Simulations show that the three-dimensional ionic transport is vacancy-driven and facilitated by rotational motion of the VO4 units, which can stabilize oxygen defects via formation of V2O7 dimers. Our findings demonstrate that palmierite oxides are a new promising class of ionic conductors where stabilization of parallel vacancy and interstitial defects can enable high ionic conductivity.
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Affiliation(s)
- Sacha Fop
- ISIS
Facility, Rutherford Appleton Laboratory, Harwell OX11 0QX, United Kingdom
- The
Chemistry Department, University of Aberdeen, Aberdeen AB24 3UE, United Kingdom
| | - James A. Dawson
- Chemistry
− School of Natural and Environmental Science, Newcastle University, Newcastle NE1 7RU, United Kingdom
- Centre
for Energy, Newcastle University, Newcastle NE1 7RU, United Kingdom
| | - Dylan N. Tawse
- The
Chemistry Department, University of Aberdeen, Aberdeen AB24 3UE, United Kingdom
| | - Matthew G. Skellern
- The
Chemistry Department, University of Aberdeen, Aberdeen AB24 3UE, United Kingdom
| | - Janet M. S. Skakle
- The
Chemistry Department, University of Aberdeen, Aberdeen AB24 3UE, United Kingdom
| | - Abbie C. Mclaughlin
- The
Chemistry Department, University of Aberdeen, Aberdeen AB24 3UE, United Kingdom
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15
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Pressure-stabilized hexagonal perovskite-related isolated tetrahedral anion silicate La6Sr3Si6O24. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.05.065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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16
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Fuller C, Murrell JI, Blom DA, Vogt T, Zhang W, Halasyamani PS, Evans IR, Evans JSO. Oxide Ion Conductivity, Proton Conductivity, and Phase Transitions in Perovskite-Derived Ba 3-x Sr x YGa 2O 7.5 0 ≤ x ≤ 3 Materials. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2022; 34:3185-3196. [PMID: 35557987 PMCID: PMC9086979 DOI: 10.1021/acs.chemmater.1c04372] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 03/11/2022] [Indexed: 06/15/2023]
Abstract
We report the synthesis, structural characterization, and oxide ion and proton conductivities of the perovskite-related Ba3-x Sr x YGa2O7.5 family. Single-phase samples are prepared for 0 ≤ x ≤ 3 and show a complex structural evolution from P2/c to C2 space groups with an increase in x. For 1.0 ≲ x ≲ 2.4, average structures determined by X-ray and neutron powder diffraction show metrically orthorhombic unit cells, but HAADF-STEM imaging reveals this is caused by microstructural effects due to intergrowths of the Ba- and Sr-rich structure types. Variable-temperature powder diffraction studies suggest that 0 ≲ x ≲ 2.4 compositions undergo a phase transition upon being heated to space group Cmcm that involves disordering of the oxygen substructure. Thermal expansion coefficients are reported for the series. Complex impedance studies show that the Ba-rich samples are mixed proton and oxide ion conductors under moist atmospheres but are predominantly oxide ion conductors at high temperatures or under dry atmospheres. Sr-rich samples show significantly less water uptake and appear to be predominantly oxide ion conductors under the conditions studied.
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Affiliation(s)
- Chloe
A. Fuller
- Department
of Chemistry, Durham University, Science Site, South Road, Durham DH1 3LE, United Kingdom
| | - James Iain Murrell
- Department
of Chemistry, Durham University, Science Site, South Road, Durham DH1 3LE, United Kingdom
| | - Douglas A. Blom
- Department
of Chemical Engineering and NanoCenter, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Thomas Vogt
- Department
of Chemical Engineering, Chemistry and Biochemistry and NanoCenter, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Weiguo Zhang
- Department
of Chemistry, University of Houston, Houston, Texas 77204-5003, United States
| | - P. Shiv Halasyamani
- Department
of Chemistry, University of Houston, Houston, Texas 77204-5003, United States
| | - Ivana Radosavljevic Evans
- Department
of Chemistry, Durham University, Science Site, South Road, Durham DH1 3LE, United Kingdom
| | - John S. O. Evans
- Department
of Chemistry, Durham University, Science Site, South Road, Durham DH1 3LE, United Kingdom
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17
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Li J, Yang L, Xu J, Fernández-Carrión AJ, Kuang X. Tetrahedral Tilting and Oxygen Vacancy Stabilization and Migration in La 1-xSr 2+x(GaO 4)O 1-0.5x Mixed Electronic/Oxide Ionic Conductors. Inorg Chem 2022; 61:5413-5424. [PMID: 35302370 DOI: 10.1021/acs.inorgchem.2c00402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The La2O3/SrO/Ga2O3 ternary system contains several compounds with remarkable oxide or proton ionic conduction. Among them, the layered LaSr2(GaO4)O compound is a less commonly studied material. Here, the crystal structure, electrical conduction properties, and ionic migration mechanism of the La1-xSr2+x(GaO4) O1-0.5x (0 ≤ x ≤ 0.3) system are thoroughly analyzed. Diffraction methods indicate that the system crystallizes in the tetragonal space group P4/ncc, which is compatible with the presence of a subtle GaO4 tetrahedral tilting along the c axis, leading to a slight deviation of the body-centered tetragonal structure previously reported. This feature is essential to further understanding the mixed p electronic/oxide ion-conducting behavior of the system. Upon La3+ for Sr2+ substitution, oxygen vacancies arise at the loosely bound oxide sublattice, which at high temperature go through the GaO4 tetrahedral layer, leading to the formation of intermediate corner-sharing Ga2O7 tetrahedral dimers, and migrate via the continuous breaking and re-formation of the dimers, assisted by the synergic rotation and deformation of neighboring GaO4 tetrahedra. The unique structural and electrical features of La1-xSr2+x(GaO4)O1-0.5x materials within the La2O3/SrO/Ga2O3 ternary system emphasize their potential application as cathode materials in LaGaO3-based fuel cells.
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Affiliation(s)
- Jiachen Li
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guangxi Universities Key Laboratory of Nonferrous Metal Oxide Electronic Functional Materials and Devices, and College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Li Yang
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guangxi Universities Key Laboratory of Nonferrous Metal Oxide Electronic Functional Materials and Devices, and College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Jungu Xu
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guangxi Universities Key Laboratory of Nonferrous Metal Oxide Electronic Functional Materials and Devices, and College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Alberto J Fernández-Carrión
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guangxi Universities Key Laboratory of Nonferrous Metal Oxide Electronic Functional Materials and Devices, and College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Xiaojun Kuang
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guangxi Universities Key Laboratory of Nonferrous Metal Oxide Electronic Functional Materials and Devices, and College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China.,Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, P. R. China
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18
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TAKAI S, TAKEMOTO R, YABUTSUKA T, YAO T. Electrochemical Properties of Cs and La Co-doped CaWO 4 Oxide Ion Conductor. ELECTROCHEMISTRY 2022. [DOI: 10.5796/electrochemistry.21-00121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
| | - Ryo TAKEMOTO
- Graduate School of Engineering, Tottori University
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19
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Zeng X, Li X, Xu J, Wang X, Deng S, He L, Sun J, Kuang X, Xing X. Structure, electrical properties, and conduction mechanism of new germanate mixed Zn-doped In 2Ge 2O 7 conductors. Inorg Chem Front 2022. [DOI: 10.1039/d2qi00740a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new germanate mixed electronic and oxide ionic conductor In1.8Zn0.2Ge2O6.9 was developed, which exhibits two-dimensional anisotropic transport nature by oxygen exchange between adjacent Ge2O7 units, with a conductivity of 1.62 × 10–2 S cm−1 at 1000 °C.
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Affiliation(s)
- Xiaoling Zeng
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guangxi Universities Key Laboratory of Nonferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, People's Republic of China
| | - Xiaohui Li
- Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, People's Republic of China
- College of Chemistry and Molecular Engineering, Peking University, Beijing National Laboratory for Molecular Science (BNLMS), Beijing 100871, People's Republic of China
| | - Jungu Xu
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guangxi Universities Key Laboratory of Nonferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, People's Republic of China
| | - Xiaoge Wang
- College of Chemistry and Molecular Engineering, Peking University, Beijing National Laboratory for Molecular Science (BNLMS), Beijing 100871, People's Republic of China
| | - Sihao Deng
- Spallation Neutron Source Science Center, Dongguan 523803, People's Republic of China
| | - Lunhua He
- Spallation Neutron Source Science Center, Dongguan 523803, People's Republic of China
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, People's Republic of China
- Songshan Lake Materials Laboratory, Dongguan 523808, People's Republic of China
| | - Junliang Sun
- College of Chemistry and Molecular Engineering, Peking University, Beijing National Laboratory for Molecular Science (BNLMS), Beijing 100871, People's Republic of China
| | - Xiaojun Kuang
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guangxi Universities Key Laboratory of Nonferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, People's Republic of China
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, People's Republic of China
| | - Xianran Xing
- Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
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20
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Yang X, Zeng X, Ming X, Yang L, Fernández Carrión AJ, Deng S, He L, Kuang X. Oxide-ion Conductivity Optimization in BiVO 4 Scheelite by Acceptor Doping Strategy. Inorg Chem Front 2022. [DOI: 10.1039/d2qi00314g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
BiVO4 scheelite is one of the few tetrahedra-based structures able to display vacancy-mediated oxide ion conduction upon acceptor doping strategy, leading to oxide ionic migration. In order to modulate the...
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21
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He C, Cao S, Wang W, Hao G. Electrical conductivity and oxygen relaxation behavior in BaBi 1−xSr xNb 5O 15−δ tungsten bronze ceramics. Dalton Trans 2022; 51:16403-16411. [DOI: 10.1039/d2dt02944h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Sr2+ ion-doped BBN-based oxygen ion conductors were systematically investigated. When using the two-step sintering method, the bulk and total conductivities of the BBN-Sr2-TS sample are enhanced by one and two orders of magnitude, respectively.
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Affiliation(s)
- Chan He
- College of Physics and Electronic Information, Yan'an University, Yan'an 716000, P. R. China
| | - Shuyao Cao
- College of Physics and Electronic Information, Yan'an University, Yan'an 716000, P. R. China
| | - Weiguo Wang
- College of Physics and Electronic Information, Yan'an University, Yan'an 716000, P. R. China
| | - Gangling Hao
- College of Physics and Electronic Information, Yan'an University, Yan'an 716000, P. R. China
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22
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Li Q, Huang F, Li S, Zhang H, Yu XY. Oxygen Vacancy Engineering Synergistic with Surface Hydrophilicity Modification of Hollow Ru Doped CoNi-LDH Nanotube Arrays for Boosting Hydrogen Evolution. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2104323. [PMID: 34738715 DOI: 10.1002/smll.202104323] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 09/04/2021] [Indexed: 06/13/2023]
Abstract
With the development of clean hydrogen energy, the cost effective and high-performance hydrogen evolution reaction (HER) electrocatalysts are urgently required. Herein, a green, facile, and time-efficient Ru doping synergistic with air-plasma treatment strategy is reported to boost the HER performance of CoNi-layered double hydroxide (LDH) nanotube arrays (NTAs) derived from zeolitic imidazolate framework nanorods. The Ru doping and air-plasma treatment not only regulate the oxygen vacancy to optimize the electron structure but also increase the surface roughness to improve the hydrophilicity and hydrogen spillover efficiency. Therefore, the air plasma treated Ru doped CoNi-LDH (P-Ru-CoNi-LDH) nanotube arrays display superior HER performance with an overpotential of 29 mV at a current density of 10 mA cm-2 . Furthermore, by assembling P-Ru-CoNi-LDH as both cathode and anode for two-electrode urea-assisted water electrolysis, a small cell voltage of 1.36 V is needed at 10 mA cm-2 and can last for 100 h without any obvious activity attenuation that showing outstanding durability. In general, the P-Ru-CoNi-LDH can improve the HER performance from intrinsic electronic structure regulation cooperated with extrinsic surface wettability modification. These findings provide an effective intrinsic and extrinsic synergistic effect avenue to develop high performance HER electrocatalysts, which is potential to be applied to other research fields.
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Affiliation(s)
- Qianqian Li
- School of Materials Science and Engineering, Anhui University, Hefei, 230601, P. R. China
| | - Fangzhi Huang
- School of Chemistry and Chemical Engineering, Anhui University, Hefei, 230601, P. R. China
| | - Shikuo Li
- School of Materials Science and Engineering, Anhui University, Hefei, 230601, P. R. China
- Key Laboratory of Structure and Functional Regulation of Hybrid Materials (Anhui University), Ministry of Education, Hefei, 230601, P. R. China
| | - Hui Zhang
- School of Materials Science and Engineering, Anhui University, Hefei, 230601, P. R. China
- Key Laboratory of Structure and Functional Regulation of Hybrid Materials (Anhui University), Ministry of Education, Hefei, 230601, P. R. China
| | - Xin-Yao Yu
- Key Laboratory of Structure and Functional Regulation of Hybrid Materials (Anhui University), Ministry of Education, Hefei, 230601, P. R. China
- Insititute of Physical Science and Information Technology, Anhui University, Hefei, 230601, P. R. China
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23
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Fuller CA, Blom DA, Vogt T, Evans IR, Evans JSO. Oxide Ion and Proton Conductivity in a Family of Highly Oxygen-Deficient Perovskite Derivatives. J Am Chem Soc 2021; 144:615-624. [PMID: 34967601 DOI: 10.1021/jacs.1c11966] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Functional oxides showing high ionic conductivity have many important technological applications. We report oxide ion and proton conductivity in a family of perovskite-related compounds of the general formula A3OhTd2O7.5, where Oh is an octahedrally coordinated metal ion and Td is a tetrahedrally coordinated metal ion. The high tetrahedral content in these ABO2.5 compositions relative to that in the perovskite ABO3 or brownmillerite A2B2O5 structures leads to tetrahedra with only three of their four vertices connected in the polyhedral framework, imparting a potential low-energy mechanism for O2- migration. The low- and high-temperature average and local structures of Ba3YGa2O7 (P2/c, a = 7.94820(5) Å, b = 5.96986(4) Å, c = 18.4641(1) Å, and β = 91.2927(5) ° at 22 °C) were determined by Rietveld and neutron pair distribution function (PDF) analysis, and a phase transition to a high-temperature P1121/a structure (a = 12.0602(1) Å, b = 9.8282(2) Å, c = 8.04982(6) Å, and γ = 107.844(3)° at 1000 °C) involving the migration of O2- ions was identified. Ionic conductivities of Ba3YGa2O7.5 and compositions substituted to introduce additional oxide vacancies and interstitials are reported. Most phases show proton conductivity at lower temperatures and oxide ion conductivity at high temperatures, with Ba3YGa2O7.5 retaining proton conductivity at high temperatures. Ba2.9La0.1YGa2O7.55 and Ba3YGa1.9Ti0.1O7.55 appear to be dominant oxide ion conductors, with conductivities an order of magnitude higher than that of the parent compound.
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Affiliation(s)
- Chloe A Fuller
- Department of Chemistry, Science Site, Durham University, South Road, Durham DH1 3LE, United Kingdom
| | - Douglas A Blom
- Department of Chemical Engineering and NanoCenter, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Thomas Vogt
- Department of Chemical Engineering, Chemistry, and Biochemistry and NanoCenter, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Ivana Radosavljevic Evans
- Department of Chemistry, Science Site, Durham University, South Road, Durham DH1 3LE, United Kingdom
| | - John S O Evans
- Department of Chemistry, Science Site, Durham University, South Road, Durham DH1 3LE, United Kingdom
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24
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Cheng Z, Yang J, Jiang P, Huang H, da-Silva I, Gao W, Cong R, Yang T. Enhancing the oxide-ionic conductivity of Ba 3Mo 1+xNb 1-2xGe xO 8.5 at intermediate temperatures: the effect of site-selective Ge 4+-substitution. Dalton Trans 2021; 50:17249-17256. [PMID: 34786583 DOI: 10.1039/d1dt02469h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Significant oxide-ionic conductivity has been recently reported for a family of cation-deficient hexagonal perovskite derivatives Ba3M2O8.5 (M = Mo/W6+ and Nb5+/V5+). Herein, strong 4-fold coordination geometry preferring Ge4+ ions are doped into Ba3Mo1+xNb1-2xGexO8.5 to manipulate the oxygen distribution within palmierite-like layers for the enhancement of oxide-ionic conductivity. Rietveld refinement of the neutron diffraction data of Ba3Mo1.2Nb0.6Ge0.2O8.5 reveals that Ge4+-ions are selectively incorporated into the palmierite-like layers, owing to their strong 4-fold coordination environment preference. Such a site-selective doping behavior leads to an increase in the occupation proportion of the O3 site and a concomitant decrease in the occupancy factor for O2. Ionic conduction measurements show that the bulk conductivity of Ba3Mo1.2Nb0.6Ge0.2O8.5 is about twice higher than that of the parent compound at intermediate temperatures (300-500 °C). Furthermore, bond-valence site energy (BVSE) landscape analysis reveals that the oxygen ionic conduction of Ba3Mo1+xNb1-2xGexO8.5 is dominated by the two-dimensional pathways along the palmierite-like layers, despite the three-dimensional (3D) oxygen diffusion pathways being present in the hybrid structure, which strongly confirms that the enhancement in ionic conductivity at intermediate temperatures is attributed to the site-selective Ge4+-substitution-induced redistribution of oxygen ions within the palmierite-like layers.
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Affiliation(s)
- Zien Cheng
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, P. R. China.
| | - Jia Yang
- School of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, P. R. China
| | - Pengfei Jiang
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, P. R. China.
| | - He Huang
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, P. R. China.
| | - Ivan da-Silva
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX110QX, UK
| | - Wenliang Gao
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, P. R. China.
| | - Rihong Cong
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, P. R. China.
| | - Tao Yang
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, P. R. China.
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25
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Tajima S, Ohba N, Suzumura A, Kajita S. Synthesis and Ion-Transport Properties of EuKGe 2O 6-, Ca 3Fe 2Ge 3O 12-, and BaCu 2Ge 2O 7-Type Oxide-Ion Conductors. Inorg Chem 2021; 60:17019-17032. [PMID: 34699213 DOI: 10.1021/acs.inorgchem.1c02143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
EuKGe2O6-, Ca3Fe2Ge3O12-, and BaCu2Ge2O7-type germanates are synthesized by a conventional solid-state method and characterized to reveal their oxide-ion-conducting properties. Materials of the EuKGe2O6 group exhibit oxide-ion conductivity (e.g., 4.6 × 10-3 S/cm at 973 K for Eu0.8Ca0.2KGe2O6-δ) and transport numbers above 96%, whereas materials of the Ca3Fe2Ge3O12 and BaCu2Ge2O7 groups exhibit mixed electron-/oxide-ion conduction. Conduction involves oxide-ion vacancies in the EuKGe2O6 group, interstitial oxide ions in the Ca3Fe2Ge3O12 group, and both oxide-ion vacancies and interstitial oxide ions in the BaCu2Ge2O7 group. The doping-induced formation of impurity phases decreases the amount of oxide-ion carriers relative to the expected values.
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Affiliation(s)
- Shin Tajima
- Toyota Central R&D Labs., Inc., 41-1, Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Nobuko Ohba
- Toyota Central R&D Labs., Inc., 41-1, Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Akitoshi Suzumura
- Toyota Central R&D Labs., Inc., 41-1, Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Seiji Kajita
- Toyota Central R&D Labs., Inc., 41-1, Yokomichi, Nagakute, Aichi 480-1192, Japan
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26
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Wang S, Wang X, Liu B, Guo Z, Ostrikov KK, Wang L, Huang W. Vacancy defect engineering of BiVO 4 photoanodes for photoelectrochemical water splitting. NANOSCALE 2021; 13:17989-18009. [PMID: 34726221 DOI: 10.1039/d1nr05691c] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Photoelectrochemical (PEC) water splitting has been regarded as a promising technology for sustainable hydrogen production. The development of efficient photoelectrode materials is the key to improve the solar-to-hydrogen (STH) conversion efficiency towards practical application. Bismuth vanadate (BiVO4) is one of the most promising photoanode materials with the advantages of visible light absorption, good chemical stability, nontoxic feature, and low cost. However, the PEC performance of BiVO4 photoanodes is limited by the relatively short hole diffusion length and poor electron transport properties. The recent rapid development of vacancy defect engineering has significantly improved the PEC performance of BiVO4. In this review article, the fundamental properties of BiVO4 are presented, followed by an overview of the methods for creating different kinds of vacancy defects in BiVO4 photoanodes. Then, the roles of vacancy defects in tuning the electronic structure, promoting charge separation, and increasing surface photoreaction kinetics of BiVO4 photoanodes are critically discussed. Finally, the major challenges and some encouraging perspectives for future research on vacancy defect engineering of BiVO4 photoanodes are presented, providing guidelines for the design of efficient BiVO4 photoanodes for solar fuel production.
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Affiliation(s)
- Songcan Wang
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China.
| | - Xin Wang
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China.
| | - Boyan Liu
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China.
| | - Zhaochen Guo
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China.
| | - Kostya Ken Ostrikov
- School of Chemistry and Physics and Centre for Materials Science Queensland University of Technology Brisbane, QLD 4000, Australia
| | - Lianzhou Wang
- Nanomaterials Centre, Australian Institute for Bioengineering and Nanotechnology and School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia.
| | - Wei Huang
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China.
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27
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Li JY, Wang CH, Wang XM, Avdeev M, Ling CD, Kennedy BJ. Revisiting the cubic crystal structures of Sr4Nb2O9 and Sr5Nb2O10. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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28
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Liu W, Geng S, Zhang W, Liao F, Tang M, Fu H, Kuang X. Experimental and Theoretical Solid-State 29Si NMR Studies on Defect Structures in La 9.33+x(SiO 4) 6O 2+1.5x Apatite Oxide Ion Conductors. Inorg Chem 2021; 60:16817-16825. [PMID: 34677070 DOI: 10.1021/acs.inorgchem.1c02710] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Oxide ion conductors can be used as electrolytes in solid oxide fuel cells, a promising energy-conversion technology. Local structures around the defects in oxide ion conductors are key for understanding the defect stabilization and migration mechanisms. As the defect contents are generally low, it is rather difficult to characterize the defect structure and therefore elucidate how oxide ions migrate. Solid-state nuclear magnetic resonance (NMR) spectroscopy is a powerful technique for probing the local structures. However, the interpretation of NMR signals mainly based on the empirical knowledge could lead to unprecise local structures. There is still controversy regarding the defect structures in the apatite-type interstitial oxide ion conductors containing isolated tetrahedral units. Here, we combine the experimental solid-state 29Si NMR spectroscopy with theoretical density functional theory calculations to investigate the defect structures in La9.33+x(SiO4)6O2+1.5x apatites. The results indicate that the 29Si resonance signals on the high field side of the main peak corresponding to the Si atoms in the bulk structure are related to La vacancies and there is no steady-state SiO5 in the defect structures. This finding provides new atomic-level understanding to the stabilization and migration of interstitial oxide ions in silicate apatites, which could guide the design and discovery of new solid oxide fuel cell electrolyte materials.
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Affiliation(s)
- Wenhao Liu
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optic and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Shipeng Geng
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optic and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Wenda Zhang
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optic and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Fuhui Liao
- College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing 100871, China
| | - Mingxue Tang
- Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China
| | - Hui Fu
- College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing 100871, China
| | - Xiaojun Kuang
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optic and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China.,Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, P. R. China
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29
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Zhao L, Geng S, Feng J, Yin C, Kuang X. Molecular dynamics simulations of oxide ion migration in La2Ga3O7.5 with completely ordered interstitial oxide ions. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122370] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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30
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Saura-Múzquiz M, Mullens BG, Maynard-Casely HE, Kennedy BJ. Neutron diffraction study of the monoclinic - tetragonal phase transition in NdNbO 4 and NdTaO 4. Dalton Trans 2021; 50:11485-11497. [PMID: 34346454 DOI: 10.1039/d1dt01981c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Phase transition and high-temperature properties of NdNbO4 and NdTaO4 were studied in situ using powder neutron diffraction methods. Both oxides undergo a reversible phase transition from a monoclinic I2/a phase at low temperatures to a tetragonal I41/a phase at high temperatures. The phase transition has been investigated through analysis of the spontaneous strains and symmetry distortion modes. Well below the transition temperature, Tc, the thermal evolution of the lattice parameters and symmetry modes suggest the transition is continuous, although a small discontinuity in both the spontaneous strains and symmetry distortion modes shows the transition is strictly first order. Analysis of the refined structures reveals that the Nb and Ta cations are best described as having a distorted 6-coordinate arrangement in the monoclinic structure, with four short and two long bonds. Breaking of the two long bonds at high temperatures, resulting in a transformation of the Nb(Ta) coordination to a regular tetrahedron, is believed to be responsible for the first order nature of the transition.
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Affiliation(s)
- Matilde Saura-Múzquiz
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia.
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31
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Fernández-Carrión AJ, Rakhmatullin A, Yang L, Pitcher MJ, Massiot D, Porcher F, Allix M, Kuang X. Sodium Site Exchange and Migration in a Polar Stuffed-Cristobalite Framework Structure. Inorg Chem 2021; 60:4322-4331. [PMID: 33719424 DOI: 10.1021/acs.inorgchem.1c00319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The study of ionic dynamics in solids is essential to understanding and developing modern energy technologies. Here we study the ionic dynamics of orthorhombic Na2MgSiO4, an interesting case of a polar stuffed-cristobalite-type structure that contains two inequivalent Na sites within the channels of the magnesium silicate tetrahedral framework. Its preparation by a solid-state reaction method favors the presence of ∼2% of Na vacancies, converting it into a pure Na ionic conductor with an optimized ionic conductivity of ∼10-5 S cm-1 at 200 °C. The macroscopic migration has been characterized through impedance spectroscopy and molecular dynamics simulation, which proves the pure Na ionic character of the compound through hopping between Na1 and Na2 sites, forming three-dimensional migration zigzag-shaped paths. High-resolution solid-state 23Na magic-angle-spinning (MAS) NMR spectroscopy is employed to characterize the local structure and microscopic dynamics of Na-ion transport in Na2MgSiO4. Remarkably, variable-temperature 23Na MAS NMR and two-dimensional exchange spectroscopy evidence for the first time a Na site exchange phenomenon at room temperature, which further triggers Na ionic conduction at elevated temperatures.
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Affiliation(s)
- Alberto J Fernández-Carrión
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | | | - Li Yang
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | | | | | - Florence Porcher
- Laboratoire Léon Brillouin, CEA Saclay, Gif Sur Yvette 91191, France
| | - Mathieu Allix
- CNRS, CEMHTI, UPR 3079, Université Orléans, Orléans F-45071, France
| | - Xiaojun Kuang
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China.,College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, P. R. China
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32
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Lv Y, Sun Y, Xu J, Xu X, Fernández-Carrión AJ, Wei T, Yi H, Kuang X. Phase Evolution, Electrical Properties, and Conduction Mechanism of Ca 12Al 14-xGa xO 33 (0 ≤ x ≤ 14) Ceramics Synthesized by a Glass Crystallization Method. Inorg Chem 2021; 60:2446-2456. [PMID: 33535755 DOI: 10.1021/acs.inorgchem.0c03344] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Mayenite Ca12Al14O33, as an oxide-ion conductor, has the potential of being applied in many fields, such as solid-oxide fuel cells. However, its relatively low oxide-ion conductivity hinders its wide practical applications and thus needs to be further optimized. Herein, a new recently developed glass crystallization route was used to prepare a series of Ga-doped Ca12Al14-xGaxO33 (0 ≤ x ≤ 14) materials, which is not accessible by the traditional solid-state reaction method. Phase evolution with the content of gallium, the corresponding structures, and their electrical properties were studied in detail. The X-ray diffraction data revealed that a pure mayenite phase can be obtained for 0 ≤ x ≤ 7, whereas when x > 7, the samples crystallize into a melilite-like orthorhombic Ca5Ga6O14-based phase. The electrical conduction studies evidence no apparent enhancement in the total conductivity for compositions 0 ≤ x ≤ 7 with the mayenite phase, and therefore, the rigidity of the framework cations and the width of the windows between cages are not key factors for oxide-ion conductivity in mayenite Ca12Al14O33-based materials, and changing the free oxygen content through aliovalent cation substitution may be the right direction. For compositions with a pure melilite-like orthorhombic phase, the conductivities also mirrored each other and are all slightly higher than those of the mayenite phases. These melilite-like Ca5Ga6O14-based materials show mixed Ca-ion, oxide-ion, and electron conduction. Furthermore, the conduction mechanisms of Ca ions and oxide ions in this composition were studied by a bond-valence-based method. The results suggested that Ca-ion conduction is mainly due to the severely underbonded Ca3 ions and that the oxide ions are most likely transported via oxygen vacancies.
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Affiliation(s)
- Yun Lv
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Yanming Sun
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Jungu Xu
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Xiangyu Xu
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Alberto J Fernández-Carrión
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Tianjie Wei
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Huaibo Yi
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Xiaojun Kuang
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
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33
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Liu Y, Meng L, Wang H, Jiao J, Xing M, Peng Y, Luo X, Tian Y. Promising lanthanide-doped BiVO 4 phosphors for highly efficient upconversion luminescence and temperature sensing. Dalton Trans 2021; 50:960-969. [PMID: 33350416 DOI: 10.1039/d0dt03377d] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The semiconductor oxide BiVO4 has been intensively studied as a highly efficient photocatalyst. Here we attempt to adopt trivalent lanthanide (Ln3+)-doped BiVO4 as a novel upconversion luminescence (UCL) material for achieving high-efficiency UCL and temperature sensing under near-infrared (NIR) irradiation. Er3+/Tm3+, Yb3+/Er3+, and Yb3+/Tm3+ ions were selected to co-dope the BiVO4 phosphors, achieving three primary colors of red, green, and blue (RGB) with high color-purity. At an optimal doping concentration, the upconversion quantum yield of the BiVO4:8%Yb3+,18%Er3+ phosphor reaches as high as 2.9%. Furthermore, we, for the first time, demonstrate the non-contact temperature sensing properties of a BiVO4:Er3+,Tm3+ phosphor via employing fluorescence intensity ratio technology. The results show that the maximum absolute thermal sensitivity is ≈70 × 10-4 K-1 at 473 K under 980 nm excitation, with high and stable sensitivity of more than 60 × 10-4 K-1 over a wide temperature range of 333-493 K. In addition, at a much safer wavelength of 1550 nm, this sample achieves maximum absolute sensitivity of 56 × 10-4 K-1 at 453 K. Moreover, the BiVO4:Er3+,Tm3+ phosphor presents high relative sensitivity of about 1.1% K-1 under both 980 and 1550 nm excitation at 293 K. These results indicate that the BiVO4 semiconductor oxide can be used as a novel host to achieve high UCL efficiency and promising thermal sensing performance, suggesting potential applications in the new fields of anti-counterfeiting, displays, and non-contact temperature sensors.
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Affiliation(s)
- Yuwei Liu
- School of Science, Dalian Maritime University, Dalian, Liaoning 116026, PR China.
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Zhang S, Si Y, Li B, Yang L, Dai W, Luo S. Atomic-Level and Modulated Interfaces of Photocatalyst Heterostructure Constructed by External Defect-Induced Strategy: A Critical Review. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2004980. [PMID: 33289948 DOI: 10.1002/smll.202004980] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 10/26/2020] [Indexed: 06/12/2023]
Abstract
Despite the existence of numerous photocatalyst heterostructures, their separation efficiency and charge flow precision remain low due to the poor study on interfacial properties. The photocatalysts with confined defects can effectively control the photogenerated carrier migration, but the metastability of such defects considerably decreases the photocatalyst stability. Meanwhile, the introduction of defective region can increase the coordinative unsaturation and delocalize local electrons to promote their interactions with the molecules/ions in that region. The selective growth of modulated heterogeneous interface by defect-induced strategy may not only increase the stability of defective structures, but also enhance the migration of interfacial charges. Using this method, photocatalytic heterostructures with low contact resistances and intimate interfaces are constructed to achieve the optimal charge migration in terms of efficiency and accuracy. In this work, the point, linear, and planar heterogeneous interfaces and related defect engineering techniques are discussed. Particularly, it is focused on the external, defect-induced interfacial heterogeneities with various spatial and dimensional configurations, which exhibit modulated and controllable interfacial properties. Furthermore, the main aspects of fabricating photocatalyst heterostructures by the defect-induced strategy, including the i) controllable generation of defects, ii) advanced characterization methods, and iii) elaborate construction of the minimal interface, are described.
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Affiliation(s)
- Shuqu Zhang
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang, Jiangxi Province, 330063, P. R. China
| | - Yanmei Si
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang, Jiangxi Province, 330063, P. R. China
| | - Bing Li
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang, Jiangxi Province, 330063, P. R. China
| | - Lixia Yang
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang, Jiangxi Province, 330063, P. R. China
| | - Weili Dai
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang, Jiangxi Province, 330063, P. R. China
| | - Shenglian Luo
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang, Jiangxi Province, 330063, P. R. China
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Abstract
Rare-earth-elements-based oxide ion conductors with various structures and their structure-property relationships were systematically presented and summarized, which can provide new insight and guidance for the development of new oxide ion conductors.
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Affiliation(s)
- Xiaohui Li
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing National Laboratory for Molecular Science (BNLMS)
- Beijing 100871
- People's Republic of China
| | - Xiaojun Kuang
- College of Chemistry and Bioengineering
- Guilin University of Technology
- Guangxi Key Laboratory of Optical and Electronic Materials and Devices
- Guilin 541004
- People's Republic of China
| | - Junliang Sun
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing National Laboratory for Molecular Science (BNLMS)
- Beijing 100871
- People's Republic of China
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36
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Peng B, Shi Y, Zhang X, Lv P. Top-down fabrication of Ti doped BiVO 4 nanosheets for efficient water oxidation under visible light. Catal Sci Technol 2021. [DOI: 10.1039/d1cy01670a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ti dopant introduces surface oxygen vacancies for the reactive sites for the OER in a top-down fabricated 2D BiVO4 nanosheet.
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Affiliation(s)
- Bei Peng
- CAS Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
| | - Yawen Shi
- State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Xin Zhang
- State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Peiwen Lv
- CAS Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
- Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, 350108, China
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37
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Modulated structure determination and ion transport mechanism of oxide-ion conductor CeNbO 4+δ. Nat Commun 2020; 11:4751. [PMID: 32958759 PMCID: PMC7506534 DOI: 10.1038/s41467-020-18481-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Accepted: 08/25/2020] [Indexed: 11/08/2022] Open
Abstract
CeNbO4+δ, a family of oxygen hyperstoichiometry materials with varying oxygen content (CeNbO4, CeNbO4.08, CeNbO4.25, CeNbO4.33) that shows mixed electronic and oxide ionic conduction, has been known for four decades. However, the oxide ionic transport mechanism has remained unclear due to the unknown atomic structures of CeNbO4.08 and CeNbO4.33. Here, we report the complex (3 + 1)D incommensurately modulated structure of CeNbO4.08, and the supercell structure of CeNbO4.33 from single nanocrystals by using a three-dimensional electron diffraction technique. Two oxide ion migration events are identified in CeNbO4.08 and CeNbO4.25 by molecular dynamics simulations, which was a synergic-cooperation knock-on mechanism involving continuous breaking and reformation of Nb2O9 units. However, the excess oxygen in CeNbO4.33 hardly migrates because of the high concentration and the ordered distribution of the excess oxide ions. The relationship between the structure and oxide ion migration for the whole series of CeNbO4+δ compounds elucidated here provides a direction for the performance optimization of these compounds.
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Gao Y, Nolan AM, Du P, Wu Y, Yang C, Chen Q, Mo Y, Bo SH. Classical and Emerging Characterization Techniques for Investigation of Ion Transport Mechanisms in Crystalline Fast Ionic Conductors. Chem Rev 2020; 120:5954-6008. [DOI: 10.1021/acs.chemrev.9b00747] [Citation(s) in RCA: 81] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yirong Gao
- University of Michigan−Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai CN-200240, China
| | - Adelaide M. Nolan
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Peng Du
- University of Michigan−Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai CN-200240, China
| | - Yifan Wu
- University of Michigan−Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai CN-200240, China
| | - Chao Yang
- University of Michigan−Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai CN-200240, China
| | - Qianli Chen
- University of Michigan−Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai CN-200240, China
| | - Yifei Mo
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
- Maryland Energy Innovation Institute, University of Maryland, College Park, Maryland 20742, United States
| | - Shou-Hang Bo
- University of Michigan−Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai CN-200240, China
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Daelman N, Hegner FS, Rellán-Piñeiro M, Capdevila-Cortada M, García-Muelas R, López N. Quasi-degenerate states and their dynamics in oxygen deficient reducible metal oxides. J Chem Phys 2020; 152:050901. [PMID: 32035446 DOI: 10.1063/1.5138484] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The physical and chemical properties of oxides are defined by the presence of oxygen vacancies. Experimentally, non-defective structures are almost impossible to achieve due to synthetic constraints. Therefore, it is crucial to account for vacancies when evaluating the characteristics of these materials. The electronic structure of oxygen-depleted oxides deeply differs from that of the native forms, in particular, of reducible metal oxides, where excess electrons can localize in various distinct positions. In this perspective, we present recent developments from our group describing the complexity of these defective materials that highlight the need for an accurate description of (i) intrinsic vacancies in polar terminations, (ii) multiple geometries and complex electronic structures with several states attainable at typical working conditions, and (iii) the associated dynamics for both vacancy diffusion and the coexistence of more than one electronic structure. All these aspects widen our current understanding of defects in oxides and need to be adequately introduced in emerging high-throughput screening methodologies.
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Affiliation(s)
- Nathan Daelman
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, BIST, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Franziska Simone Hegner
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, BIST, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Marcos Rellán-Piñeiro
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, BIST, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Marçal Capdevila-Cortada
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, BIST, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Rodrigo García-Muelas
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, BIST, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Núria López
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, BIST, Av. Països Catalans 16, 43007 Tarragona, Spain
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Lv Y, Yi H, Wei T, Liu J, Xu X, Xu J. Electrical properties of Ca12Al14O33 synthesised through polymer assisted deposition and glass crystallization routes. RSC Adv 2020; 10:35803-35810. [PMID: 35517092 PMCID: PMC9056911 DOI: 10.1039/d0ra07082c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 09/21/2020] [Indexed: 11/30/2022] Open
Abstract
In this paper, two new methods, polymer assisted deposition (PAD) and glass crystallization (GC) methods were reported for the first time to prepare oxide ion conductor Ca12Al14O33, with their microstructures and electrical properties compared to that of a sample prepared by the traditional solid-state reaction (SSR) method. The results showed that these two new methods are effective for improving ceramic densities and oxide ion conductivities compared to the SSR method, and the ceramic prepared from the GC method in the present work possessed the highest level of ∼94% of the theoretical density and ∼1.0 × 10−3 S cm−1 at 900 °C for the bulk conductivity. A new bond valence method was applied to study the oxide ion conducting mechanism, which revealed an exchange process between the free oxide ion and the framework ion, and the wide windows connecting the Ca–Al–O framework cages were shown to be the key factor limiting oxide ion transport. Ca12Al14O33 material was prepared by two new methods with optimized microstructures and improved electrical properties compared to the solid-reaction method.![]()
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Affiliation(s)
- Yun Lv
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials
- Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices
- College of Materials Science and Engineering
- Guilin University of Technology
- Guilin 541004
| | - Huaibo Yi
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials
- Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices
- College of Materials Science and Engineering
- Guilin University of Technology
- Guilin 541004
| | - Tianjie Wei
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials
- Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices
- College of Materials Science and Engineering
- Guilin University of Technology
- Guilin 541004
| | - Junwei Liu
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials
- Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices
- College of Materials Science and Engineering
- Guilin University of Technology
- Guilin 541004
| | - Xiangyu Xu
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials
- Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices
- College of Materials Science and Engineering
- Guilin University of Technology
- Guilin 541004
| | - Jungu Xu
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials
- Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices
- College of Materials Science and Engineering
- Guilin University of Technology
- Guilin 541004
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Liu G, Li F, Zhu Y, Li J, Sun L. Cobalt doped BiVO4 with rich oxygen vacancies for efficient photoelectrochemical water oxidation. RSC Adv 2020; 10:28523-28526. [PMID: 35520082 PMCID: PMC9055882 DOI: 10.1039/d0ra01961e] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Accepted: 07/12/2020] [Indexed: 12/14/2022] Open
Abstract
A facile electrodeposition method was developed to prepare Co-BiVO4 thin films with rich oxygen vacancies. The resulting photoanode exhibited a photocurrent density of 3.5 mA cm−2 1.23 V (vs. reversible hydrogen electrode (RHE), AM 1.5 G), which is over two times higher than that of undoped BiVO4. A facile electrodeposition method was developed to prepare Co-BiVO4 thin films with rich oxygen vacancies.![]()
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Affiliation(s)
- Guoquan Liu
- State Key Laboratory of Fine Chemicals
- DUT-KTH Joint Education and Research Center on Molecular Devices
- Dalian University of Technology
- Dalian 116024
- P. R. China
| | - Fei Li
- State Key Laboratory of Fine Chemicals
- DUT-KTH Joint Education and Research Center on Molecular Devices
- Dalian University of Technology
- Dalian 116024
- P. R. China
| | - Yong Zhu
- State Key Laboratory of Fine Chemicals
- DUT-KTH Joint Education and Research Center on Molecular Devices
- Dalian University of Technology
- Dalian 116024
- P. R. China
| | - Jiayuan Li
- State Key Laboratory of Fine Chemicals
- DUT-KTH Joint Education and Research Center on Molecular Devices
- Dalian University of Technology
- Dalian 116024
- P. R. China
| | - Licheng Sun
- State Key Laboratory of Fine Chemicals
- DUT-KTH Joint Education and Research Center on Molecular Devices
- Dalian University of Technology
- Dalian 116024
- P. R. China
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Hegner FS, Forrer D, Galán-Mascarós JR, López N, Selloni A. Versatile Nature of Oxygen Vacancies in Bismuth Vanadate Bulk and (001) Surface. J Phys Chem Lett 2019; 10:6672-6678. [PMID: 31608645 DOI: 10.1021/acs.jpclett.9b02552] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Bismuth vanadate (BiVO4) has emerged as one of the most promising photoanode materials for solar fuel production. Oxygen vacancies play a pivotal role in the photoelectrochemical efficiency, yet their electronic nature and contribution to n-type conductivity are still under debate. Using first-principles calculations, we show that oxygen vacancies in BiVO4 have two distinguishable geometric configurations characterized by either undercoordinated, reduced VIVO3 and BiIIO7 subunits or a VIV-O-VIV/V bridge (split vacancy), quenching the oxygen vacancy site. While both configurations have similar energies in the bulk, the (001) subsurface acts like an energetic sink that stabilizes the split oxygen vacancy by ∼1 eV. The barrierless creation of a bridging V2O7 unit allows for partial electron delocalization throughout the near-surface region, consistent with recent experimental observations indicating that BiVO4(001) is an electron-rich surface.
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Affiliation(s)
- Franziska Simone Hegner
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST) , Avinguda Paisos Catalans 16 , 43007 Tarragona , Spain
| | - Daniel Forrer
- ICMATE-CNR and INSTM , Via F. Marzolo 1 , 35131 Padua , Italy
| | - José Ramón Galán-Mascarós
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST) , Avinguda Paisos Catalans 16 , 43007 Tarragona , Spain
- ICREA , Passeig Lluís Companys 23 , 08010 Barcelona , Spain
| | - Núria López
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST) , Avinguda Paisos Catalans 16 , 43007 Tarragona , Spain
| | - Annabella Selloni
- Princeton University , Department of Chemistry , New Jersey 08544 , United States
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Coduri M, Casolo S, Jalarvo N, Scavini M. Disorder in La 1−x
Ba 1+x
GaO 4−x/2 ionic conductor: resolving the pair distribution function through insight from first-principles modeling. J Appl Crystallogr 2019. [DOI: 10.1107/s1600576719008033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Ionic conduction in dry LaBaGaO4 occurs through the vacant oxygen sites formed by the substitution of Ba for La. The resulting La1−x
Ba1+x
GaO4−x/2 solid solution shows significant disorder characteristics. The local structure of compositions x = 0, 0.20 and 0.30 was studied using the pair distribution function (PDF). Unfortunately, increasing peak overlap and the number of independent structural parameters make PDF modeling challenging when dealing with low-symmetry phases. To overcome this problem, density functional theory (DFT) was employed to create different structural models, each one with a different relative position for the substitutional Ba ion with respect to the oxygen vacancy. The atomic distributions generated by DFT were used as a starting point to refine experimental PDF data. All models result in the formation of Ga2O7 dimers, with their major axis oriented along the c axis. At the local scale, the most stable DFT model also provides the best fit of the PDF. This accounts for the dopant as first and second neighbors of the vacancy and of the O bridge in the dimer, suggesting that substitutional barium ions act as pinning centers for oxygen vacancies. Above 6 Å the average orthorhombic structure fits the PDF better than the DFT models, thus indicating that Ga2O7 dimers are not correlated with each other to form extended ordered structures. The combination of DFT simulations and X-ray diffraction/PDF refinements was used successfully to model the local atomic structure in La1−x
Ba1+x
GaO4−x/2, thus suggesting that this approach could be positively applied in general to disordered systems.
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Fop S, McCombie KS, Wildman EJ, Skakle JMS, Mclaughlin AC. Hexagonal perovskite derivatives: a new direction in the design of oxide ion conducting materials. Chem Commun (Camb) 2019; 55:2127-2137. [PMID: 30676598 DOI: 10.1039/c8cc09534e] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Various structural families have been reported to support oxide ion conductivity; among these, perovskite conductors have received particular attention. The perovskite structure is generally composed of a framework of corner-sharing octahedral units. When the octahedral units share their faces, hexagonal perovskites are formed. Mixed combinations of corner-sharing and face-sharing octahedral units can give rise to a variety of hexagonal perovskite derivatives. However, the ionic conducting properties of these materials have not been well explored. In this feature article, we review the conducting properties of the most significant hexagonal perovskite derivatives, with special focus on Ba3MM'O8.5. Ba3MM'O8.5 is the first hexagonal perovskite derivative to exhibit substantial oxide ion conductivity, and here we outline the structural features that are key for the oxide ion conduction within this system. The results demonstrate that further investigation of hexagonal perovskite derivatives could open up new directions in the design of oxide ion conductors.
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Affiliation(s)
- Sacha Fop
- Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB24 3UE, UK.
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