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Shang C, Xiao X, Xu Q. Coordination chemistry in modulating electronic structures of perovskite-type oxide nanocrystals for oxygen evolution catalysis. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2023.215109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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2
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Kim HS, An JS, Bae HB, Chung SY. Atomic-scale observation of premelting at 2D lattice defects inside oxide crystals. Nat Commun 2023; 14:2255. [PMID: 37081020 PMCID: PMC10119109 DOI: 10.1038/s41467-023-37977-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Accepted: 04/05/2023] [Indexed: 04/22/2023] Open
Abstract
Since two major criteria for melting were proposed by Lindemann and Born in the early 1900s, many simulations and observations have been carried out to elucidate the premelting phenomena largely at the crystal surfaces and grain boundaries below the bulk melting point. Although dislocations and clusters of vacancies and interstitials were predicted as possible origins to trigger the melting, experimental direct observations demonstrating the correlation of premelting with lattice defects inside a crystal remain elusive. Using atomic-column-resolved imaging with scanning transmission electron microscopy in polycrystalline BaCeO3, here we clarify the initiation of melting at two-dimensional faults inside the crystals below the melting temperature. In particular, melting in a layer-by-layer manner rather than random nucleation at the early stage was identified as a notable finding. Emphasizing the value of direct atomistic observation, our study suggests that lattice defects inside crystals should not be overlooked as preferential nucleation sites for phase transformation including melting.
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Affiliation(s)
- Hye-Sung Kim
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Korea
- Korea Institute of Energy Research, Daejeon, 34129, Korea
| | - Ji-Sang An
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Korea
| | - Hyung Bin Bae
- KAIST Analysis Center, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Korea
| | - Sung-Yoon Chung
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Korea.
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3
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Panda A, Palodhi K, Chakraborty R, Maiti S. Application of porosities in the transparent electrode layer of a perovskite solar cell for performance enhancement. APPLIED OPTICS 2022; 61:9843-9850. [PMID: 36606814 DOI: 10.1364/ao.471396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 09/26/2022] [Indexed: 06/17/2023]
Abstract
Substitution of monocrystalline or polycrystalline silicon as active materials in photovoltaics with highly efficient perovskite materials is quite common. Although perovskite materials offer better flexibility, are cost-effective, and have higher conversion efficiency, they still require structural modifications for better performance. This study quantitatively investigates how mesoporous top surfaces improve the performance of methylammonium lead iodide (C H 3 N H 3 P b I 3) perovskite solar cells. In fact, both the diameter and the depth of the pores have been tuned to achieve better performance. The performance is further optimized by replacing mesoporous active material with planar active material coated with mesoporous indium tin oxide (ITO). We have demonstrated that the proposed structure achieves the maximum conversion efficiency (η) of 27.43% with an open-circuit voltage (V O C ) of 1.07 V and a short circuit current density (J S C ) of 29.09m A/c m 2, with a fill factor (FF) of 88.10%.
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4
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Local-electrostatics-induced oxygen octahedral distortion in perovskite oxides and insight into the structure of Ruddlesden-Popper phases. Nat Commun 2021; 12:5527. [PMID: 34545102 PMCID: PMC8452630 DOI: 10.1038/s41467-021-25889-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 09/03/2021] [Indexed: 11/08/2022] Open
Abstract
As the physical properties of ABX3 perovskite-based oxides strongly depend on the geometry of oxygen octahedra containing transition-metal cations, precise identification of the distortion, tilt, and rotation of the octahedra is an essential step toward understanding the structure-property correlation. Here we discover an important electrostatic origin responsible for remarkable Jahn-Teller-type tetragonal distortion of oxygen octahedra during atomic-level direct observation of two-dimensional [AX] interleaved shear faults in five different perovskite-type materials, SrTiO3, BaCeO3, LaCoO3, LaNiO3, and CsPbBr3. When the [AX] sublayer has a net charge, for example [LaO]+ in LaCoO3 and LaNiO3, substantial tetragonal elongation of oxygen octahedra at the fault plane is observed and this screens the strong repulsion between the consecutive [LaO]+ layers. Moreover, our findings on the distortion induced by local charge are identified to be a general structural feature in lanthanide-based An + 1BnX3n + 1-type Ruddlesden-Popper (RP) oxides with charged [LnO]+ (Ln = La, Pr, Nd, Eu, and Gd) sublayers, among more than 80 RP oxides and halides with high symmetry. The present study thus demonstrates that the local uneven electrostatics is a crucial factor significantly affecting the crystal structure of complex oxides.
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5
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Wang K, Kang X, Yuan C, Han X, Liu Y, Cui Y. Porous 2D and 3D Covalent Organic Frameworks with Dimensionality-Dependent Photocatalytic Activity in Promoting Radical Ring-Opening Polymerization. Angew Chem Int Ed Engl 2021; 60:19466-19476. [PMID: 34164891 DOI: 10.1002/anie.202107915] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Indexed: 11/06/2022]
Abstract
Dimensionality is a fundamental parameter to modulate the properties of solid materials by tuning electronic structures. Covalent organic frameworks (COFs) are a prominent class of porous crystalline materials, but the study of dimensional dependence on their physicochemical properties is still lacking. Herein we illustrate photocatalytic performances of N,N-diaryl dihydrophenazine (PN)-based COFs are heavily dependent on the structural dimensionality. Six isostructural imine-bonded 2D-PN COFs and one 3D-PN COF were prepared. All can be heterogeneous photocatalysts to promote radical ring-opening polymerization of vinylcyclopropanes (VCPs), which typically produces polymers with a combination of linear (l) and cyclic (c) repeat units. The 2D-PN COFs have much higher catalytic activity than the 3D-PN COF, allowing the efficient synthesis of poly(VCPs) with controlled molecular weight, low dispersity and high l/c selectivity (up to 97 %). The improved performance can be ascribed to the 2D structure which has a larger internal surface area, more catalytically active sites, higher photosensitizing ability and photoinduced electron transfer efficiency.
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Affiliation(s)
- Kaixuan Wang
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Xing Kang
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Chen Yuan
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Xing Han
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Yan Liu
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Yong Cui
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China
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6
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Wang K, Kang X, Yuan C, Han X, Liu Y, Cui Y. Porous 2D and 3D Covalent Organic Frameworks with Dimensionality‐Dependent Photocatalytic Activity in Promoting Radical Ring‐Opening Polymerization. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202107915] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Kaixuan Wang
- School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 China
| | - Xing Kang
- School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 China
| | - Chen Yuan
- School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 China
| | - Xing Han
- School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 China
| | - Yan Liu
- School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 China
| | - Yong Cui
- School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 China
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7
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Wang H, Lin N, Xu R, Yu Y, Zhao X. First principles studies of electronic, mechanical and optical properties of Cr-doped cubic ZrO2. Chem Phys 2020. [DOI: 10.1016/j.chemphys.2020.110972] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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8
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Structural characterization and property modification for two-dimensional (001) SrTiO3 nanosheets. APPLIED NANOSCIENCE 2020. [DOI: 10.1007/s13204-020-01528-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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9
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Bak J, Bae HB, Oh C, Son J, Chung SY. Effect of Lattice Strain on the Formation of Ruddlesden-Popper Faults in Heteroepitaxial LaNiO 3 for Oxygen Evolution Electrocatalysis. J Phys Chem Lett 2020; 11:7253-7260. [PMID: 32677839 DOI: 10.1021/acs.jpclett.0c01426] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
A great deal of research has recently been focused on Ruddlesden-Popper (RP) two-dimensional planar faults consisting of intervened [AO] monolayers in an ABO3 perovskite framework due to the structurally peculiar shear configuration. In this work, we scrutinize the effect of elastic strain on the generation behavior of RP faults, which are electrocatalytically very active sites for the oxygen evolution reaction (OER), in (001) epitaxial LaNiO3 thin films through by using two distinct single-crystal substrates with different cubic lattice parameters. Atomic-scale direct observations reveal that RP faults can be more favorably created when tensile misfit strain is exerted. Furthermore, we demonstrate that the controlled growth of thin films show notably enhanced OER activity by the RP faults. The findings in this study highlight the impact of symmetry-breaking defect formation for better oxygen electrocatalysis in perovskite oxides.
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Affiliation(s)
- Jumi Bak
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
| | - Hyung Bin Bae
- KAIST Analysis Center, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
| | - Chadol Oh
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 37673, Korea
| | - Junwoo Son
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 37673, Korea
| | - Sung-Yoon Chung
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
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10
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Cao C, Shang C, Li X, Wang Y, Liu C, Wang X, Zhou S, Zeng J. Dimensionality Control of Electrocatalytic Activity in Perovskite Nickelates. NANO LETTERS 2020; 20:2837-2842. [PMID: 32207976 DOI: 10.1021/acs.nanolett.0c00553] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The dimensionality of the crystal structure plays an important role in the electronic structures of materials. Ruddlesden-Popper perovskite oxides offer an attractive platform for studying this role due to dimensional flexibility. The effects of dimensionality on physical properties in those oxides have been widely reported. However, the study of dimensional dependence on the chemical properties is still lacking. Here, we synthesized a series of Ruddlesden-Popper perovskite nickelates LanSrNinO3n+1 (n = 1, 2, 3, and ∞) to explore the role of dimensionality on oxygen-evolution reaction (OER) performance. As the dimensionality increased with n, the nickelates exhibited an enhanced OER activity. We found that the weakening of electron correlations among Ni 3d electrons by increasing the dimensionality induced an insulator-to-metal transition and a strengthened Ni-O hybridization, both of which accelerated the OER kinetics. This work sets up a bridge between the dimensionality and electrocatalysis, which provides guidance for designing highly efficient oxygen-evolving catalysts.
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Affiliation(s)
- Cong Cao
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Chunyan Shang
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Xu Li
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Yinyin Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Chunxiao Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Xinyi Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Shiming Zhou
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Jie Zeng
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
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11
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Yang L, Wu H, Zhang W, Chen Z, Li J, Lou X, Xie Z, Zhu R, Chang H. Anomalous oxidation and its effect on electrical transport originating from surface chemical instability in large-area, few-layer 1T'-MoTe 2 films. NANOSCALE 2018; 10:19906-19915. [PMID: 30346016 DOI: 10.1039/c8nr05699d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Two-dimensional (Mo,W)Te2 films have recently attracted significant research interest as electronic device channel materials, topological insulators and Weyl semimetals. However, one critical concern that can hamper their diverse applications is surface chemical instability due to weak Mo(W)-Te bond energy reflected in the small electronegativity difference between Mo(W) and Te, which fundamentally induces unpredictable surface oxidation and remarkably affects the film electrical transport. Here, for the first time, we clarify an anomalous oxidation featuring an unbalanced oxidation process in large-area, few-layer 1T'-MoTe2, which originates from the surface chemical instability. We identify the oxidation temperature, oxygen flow rate, structural polymorphism, and atomic chemical bond electronegativity that dominate preferential surface oxidation, which can be monitored by the appearance and decomposition of Raman-active Te metalloids. Importantly, we verify the formation of an ultrathin natural amorphous MoO3-TeO2 surface layer with an approximate self-limiting thickness that significantly affects the transport properties of the underlying few-layer 1T'-MoTe2 film. We also reveal a similar oxidation tendency in few-layer 2H-MoTe2 and 1T'-WTe2 but with a higher resistance to oxidation than 1T'-MoTe2 due to their inherent phase stability. Our findings not only represent a strong advancement in understanding surface chemical instability of atomically thin 2D TMDC materials, but also highlight technically essential importance of constructing ultrathin natural oxide dielectrics/TMDC interfaces with a controllable surface oxidation process for atomically thin TMDC-based devices.
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Affiliation(s)
- Li Yang
- Center for Joining and Electronic Packaging, State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
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12
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Ko Y, Kwon M, Bae WK, Lee B, Lee SW, Cho J. Flexible supercapacitor electrodes based on real metal-like cellulose papers. Nat Commun 2017; 8:536. [PMID: 28912562 PMCID: PMC5599591 DOI: 10.1038/s41467-017-00550-3] [Citation(s) in RCA: 101] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2017] [Accepted: 07/07/2017] [Indexed: 11/09/2022] Open
Abstract
The effective implantation of conductive and charge storage materials into flexible frames has been strongly demanded for the development of flexible supercapacitors. Here, we introduce metallic cellulose paper-based supercapacitor electrodes with excellent energy storage performance by minimizing the contact resistance between neighboring metal and/or metal oxide nanoparticles using an assembly approach, called ligand-mediated layer-by-layer assembly. This approach can convert the insulating paper to the highly porous metallic paper with large surface areas that can function as current collectors and nanoparticle reservoirs for supercapacitor electrodes. Moreover, we demonstrate that the alternating structure design of the metal and pseudocapacitive nanoparticles on the metallic papers can remarkably increase the areal capacitance and rate capability with a notable decrease in the internal resistance. The maximum power and energy density of the metallic paper-based supercapacitors are estimated to be 15.1 mW cm−2 and 267.3 μWh cm−2, respectively, substantially outperforming the performance of conventional paper or textile-type supercapacitors. With ligand-mediated layer-by-layer assembly between metal nanoparticles and small organic molecules, the authors prepare metallic paper electrodes for supercapacitors with high power and energy densities. This approach could be extended to various electrodes for portable/wearable electronics.
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Affiliation(s)
- Yongmin Ko
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Minseong Kwon
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Wan Ki Bae
- Photoelectronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Byeongyong Lee
- The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, 30332, USA
| | - Seung Woo Lee
- The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, 30332, USA.
| | - Jinhan Cho
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
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13
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Pham A, Li S. Engineering the strongly correlated properties of bulk Ruddlesden-Popper transition metal oxides via self-doping. Phys Chem Chem Phys 2017; 19:11373-11379. [PMID: 28422209 DOI: 10.1039/c7cp01700f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We demonstrate via first-principles calculations a novel method of tuning the electron-electron interactions in bulk oxide materials via controlling the cationic layer arrangement. Using the Ruddlesden-Popper oxides LaSrMnO4 and LaSrTiO4 as examples, our study demonstrates that a self-doping effect can be induced by changing the stacking of the neutral and charged cationic layers. It is believed that such a phenomenon is associated with different movements of apical oxygen atoms, resulting in diverse bandgaps, magnetism and orbital degrees of freedom in the same stoichiometric strongly-correlated material. This finding may open up a new direction to engineer the transition metal oxides for practical applications requiring tunable electronic properties without external doping.
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Affiliation(s)
- Anh Pham
- School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.
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14
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Bak J, Bae HB, Kim J, Oh J, Chung SY. Formation of Two-Dimensional Homologous Faults and Oxygen Electrocatalytic Activities in a Perovskite Nickelate. NANO LETTERS 2017; 17:3126-3132. [PMID: 28394129 DOI: 10.1021/acs.nanolett.7b00561] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Atomic-scale direct probing of active sites and subsequent elucidation of the structure-activity relationship are important issues involving oxide-based electrocatalysts to achieve better electrochemical conversion efficiency. By generating Ruddlesden-Popper (RP) two-dimensional homologous faults via simple control of the cation nonstoichiometry in LaNiO3 thin films, we demonstrate that strong tetragonal distortion of [NiO6] octahedra is induced by more than 20% elongation of Ni-O bonds in the faults. In addition to direct visualization of the elongation by scanning transmission electron microscopy, we identify that the distorted [NiO6] octahedra in the faults show considerably higher electrocatalytic activities than other surface sites during the electrochemical oxygen evolution reaction. This unequivocal evidence of the octahedral distortion and its impact on electrocatalysis in LaNiO3 suggests that the formation of RP-type faults can provide an efficient way to control the octahedral geometry and thereby remarkably enhance the oxygen catalytic performance of perovskite oxides.
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Affiliation(s)
- Jumi Bak
- Graduate School of EEWS and ‡KAIST Analysis Center, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Korea
| | - Hyung Bin Bae
- Graduate School of EEWS and ‡KAIST Analysis Center, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Korea
| | - Jaehoon Kim
- Graduate School of EEWS and ‡KAIST Analysis Center, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Korea
| | - Jihun Oh
- Graduate School of EEWS and ‡KAIST Analysis Center, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Korea
| | - Sung-Yoon Chung
- Graduate School of EEWS and ‡KAIST Analysis Center, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Korea
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15
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Li J, Yin D, Li Q, Sun R, Huang S, Meng F. Interfacial defects induced electronic property transformation at perovskite SrVO3/SrTiO3 and LaCrO3/SrTiO3 heterointerfaces. Phys Chem Chem Phys 2017; 19:6945-6951. [DOI: 10.1039/c6cp07691b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unravelling the atomic structure and chemical species of interfacial defects is critical to understanding the origin of interfacial properties in many heterojunctions.
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Affiliation(s)
- Junjie Li
- Engineering Research Center for Nanophotonics and Advanced Instrument
- Ministry of Education
- Department of Physics
- East China Normal University
- Shanghai 200062
| | - Deqiang Yin
- School of Manufacturing Science and Engineering
- Sichuan University
- Chengdu 610064
- China
| | - Qiang Li
- School of Mechanical Engineering
- University of Shanghai for Science and Technology
- Shanghai 200093
- China
| | - Rong Sun
- Institute of Engineering Innovation
- The University of Tokyo
- Bunkyo-ku
- Japan
| | - Sumei Huang
- Engineering Research Center for Nanophotonics and Advanced Instrument
- Ministry of Education
- Department of Physics
- East China Normal University
- Shanghai 200062
| | - Fanzhi Meng
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
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16
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Zou YC, Chen ZG, Kong F, Lin J, Drennan J, Cho K, Wang Z, Zou J. Planar Vacancies in Sn1-xBixTe Nanoribbons. ACS NANO 2016; 10:5507-5515. [PMID: 27116636 DOI: 10.1021/acsnano.6b01953] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Vacancy engineering is a crucial approach to manipulate physical properties of semiconductors. Here, we demonstrate that planar vacancies are formed in Sn1-xBixTe nanoribbons by using Bi dopants via a facile chemical vapor deposition. Through combination of sub-angstrom-resolution imaging and density functional theory calculations, these planar vacancies are found to be associated with Bi segregations, which significantly lower their formation energies. The planar vacancies exhibit polymorphic structures with local variations in the lattice relaxation level, determined by their proximity to the nanoribbon surface. Such polymorphic planar vacancies, in conjunction with Bi dopants, trigger distinct localized electronic states, offering platforms for device applications of ternary chalcogenide materials.
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Affiliation(s)
| | | | - Fantai Kong
- Department of Materials Science & Engineering, The University of Texas at Dallas , Richardson, Texas 75080, United States
| | | | | | - Kyeongjae Cho
- Department of Materials Science & Engineering, The University of Texas at Dallas , Richardson, Texas 75080, United States
| | - Zhongchang Wang
- WPI, Advanced Institute for Materials Research, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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17
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Lin L, Liu T, Liu J, Ji K, Sun R, Zeng W, Wang Z. Synthesis of carbon fiber@nickel oxide nanosheet core–shells for high-performance supercapacitors. RSC Adv 2015. [DOI: 10.1039/c5ra14568f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report on the design and synthesis of CFs@NiO-NSs by growing nickel oxide nanosheets (NiO-NSs) on carbon fibers (CFs), and find that the system shows a more enhanced electrochemical performance.
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Affiliation(s)
- Liyang Lin
- College of Materials Science and Engineering
- Chongqing University
- Chongqing 400030
- China
- Advanced Institute for Materials Research
| | - Tianmo Liu
- College of Materials Science and Engineering
- Chongqing University
- Chongqing 400030
- China
| | - Jianlin Liu
- Advanced Institute for Materials Research
- Tohoku University
- Sendai 980-8577
- Japan
- Department of Applied Physics
| | - Kemeng Ji
- Advanced Institute for Materials Research
- Tohoku University
- Sendai 980-8577
- Japan
| | - Rong Sun
- Advanced Institute for Materials Research
- Tohoku University
- Sendai 980-8577
- Japan
| | - Wen Zeng
- College of Materials Science and Engineering
- Chongqing University
- Chongqing 400030
- China
| | - Zhongchang Wang
- Advanced Institute for Materials Research
- Tohoku University
- Sendai 980-8577
- Japan
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Zhang S, Wang Q, Kawazoe Y, Jena P. Three-Dimensional Metallic Boron Nitride. J Am Chem Soc 2013; 135:18216-21. [DOI: 10.1021/ja410088y] [Citation(s) in RCA: 125] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Shunhong Zhang
- Center
for Applied Physics and Technology, College of Engineering, Peking University, Beijing 100871, China
| | - Qian Wang
- Center
for Applied Physics and Technology, College of Engineering, Peking University, Beijing 100871, China
- Department
of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Yoshiyuki Kawazoe
- Institute
for Material Research, Tohoku University, Sendai, 980-8577, Japan
| | - Puru Jena
- Department
of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
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