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Yuan H, Yan H, Meng Y, Matsushita Y, Yamaura K, Tsujimoto Y. Flux Crystal Growth, Structure, and Optical Properties of LiLa 3Ti 2S 3O 6: An Oxysulfide Phase Derived from K 2NiF 4-Type Structure. Inorg Chem 2024; 63:15443-15450. [PMID: 39093985 DOI: 10.1021/acs.inorgchem.4c02546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2024]
Abstract
Single crystals of a new titanium oxysulfide, LiLa3Ti2S3O6, were grown from a KI molten salt. Single-crystal X-ray diffraction analysis revealed that LiLa3Ti2S3O6 crystallizes in the space group Pnma with lattice parameters of a = 11.7319(4) Å, b = 3.94787(14) Å, and c = 20.6885(6) Å. In this structure, the one-dimensional chains of corner-sharing TiO5S octahedra are further corner-linked via equatorial and apical oxygen atoms to form unique corrugated two-dimensional perovskite-type layers in the ab plane with one octahedral thickness. These layers were intervened along the c-axis by the LaS rock-salt layers corrugated concomitantly with the perovskite-type layers, and LiO2S2 tetrahedral chains were located between these two types of two-dimensional layers. LiLa3Ti2S3O6 can be viewed as a modified K2NiF4-type structure with TiO5S octahedral layers stacked in a zigzag manner along the c axis. The oxysulfide has a direct-type band gap of 1.85 eV, based on UV-vis-NIR diffuse reflectance measurements. First-principles calculations showed that the conduction band minimum mainly consists of Ti 3d orbitals, and the valence band maximum consists of S 3p, O 2p, and Li 2s orbitals. The electronic structures near the Fermi level are similar to those of the structurally related photocatalytic oxysulfides Y2Ti2S2O5 and La5Ti2CuS5O7.
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Affiliation(s)
- Hongbo Yuan
- Research Center for Materials Nanoarchitechtonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, North 10 West 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
| | - Hong Yan
- Research Center for Materials Nanoarchitechtonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, North 10 West 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
| | - Yu Meng
- Research Center for Materials Nanoarchitechtonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, North 10 West 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
| | - Yoshitaka Matsushita
- Materials Analysis Station, NIMS, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Kazunari Yamaura
- Research Center for Materials Nanoarchitechtonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, North 10 West 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
| | - Yoshihiro Tsujimoto
- Research Center for Materials Nanoarchitechtonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, North 10 West 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
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Lin L, Ma Y, Vequizo JJM, Nakabayashi M, Gu C, Tao X, Yoshida H, Pihosh Y, Nishina Y, Yamakata A, Shibata N, Hisatomi T, Takata T, Domen K. Efficient and stable visible-light-driven Z-scheme overall water splitting using an oxysulfide H 2 evolution photocatalyst. Nat Commun 2024; 15:397. [PMID: 38195692 PMCID: PMC10776739 DOI: 10.1038/s41467-024-44706-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 01/02/2024] [Indexed: 01/11/2024] Open
Abstract
So-called Z-scheme systems permit overall water splitting using narrow-bandgap photocatalysts. To boost the performance of such systems, it is necessary to enhance the intrinsic activities of the hydrogen evolution photocatalyst and oxygen evolution photocatalyst, promote electron transfer from the oxygen evolution photocatalyst to the hydrogen evolution photocatalyst, and suppress back reactions. The present work develop a high-performance oxysulfide photocatalyst, Sm2Ti2O5S2, as an hydrogen evolution photocatalyst for use in a Z-scheme overall water splitting system in combination with BiVO4 as the oxygen evolution photocatalyst and reduced graphene oxide as the solid-state electron mediator. After surface modifications of the photocatalysts to promote charge separation and redox reactions, this system is able to split water into hydrogen and oxygen for more than 100 hours with a solar-to-hydrogen energy conversion efficiency of 0.22%. In contrast to many existing photocatalytic systems, the water splitting activity of the present system is only minimally reduced by increasing the background pressure to 90 kPa. These results suggest characteristics suitable for applications under practical operating conditions.
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Affiliation(s)
- Lihua Lin
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan
| | - Yiwen Ma
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan
| | - Junie Jhon M Vequizo
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan
| | - Mamiko Nakabayashi
- Institute for Engineering Innovation, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Chen Gu
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan
| | - Xiaoping Tao
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan
| | - Hiroaki Yoshida
- Science and Innovation Center, Mitsubishi Chemical Corporation, Aoba-ku, Yokohama-shi, Kanagawa, Japan
- Japan Technological Research Association of Artificial Photosynthetic Chemical Process (ARPChem), Tokyo, Japan
| | - Yuriy Pihosh
- Office of University Professors, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Yuta Nishina
- Graduate School of Natural Science and Technology, Okayama University, Kita-ku, Okayama, Japan
| | - Akira Yamakata
- Faculty of Natural Science and Technology, Okayama University, Kita-ku, Okayama, Japan
| | - Naoya Shibata
- Institute for Engineering Innovation, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Takashi Hisatomi
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan
| | - Tsuyoshi Takata
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan
| | - Kazunari Domen
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan.
- Office of University Professors, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.
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Yao Y, Li Q, Chu W, Ding YM, Yan L, Gao Y, Neogi A, Govorov A, Zhou L, Wang Z. Exploration of the origin of the excellent charge-carrier dynamics in Ruddlesden-Popper oxysulfide perovskite Y 2Ti 2O 5S 2. Phys Chem Chem Phys 2023. [PMID: 38051151 DOI: 10.1039/d3cp02860g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
Although the efficient separation of electron-hole (e-h) pairs is one of the most sought-after electronic characteristics of materials, due to thermally induced atomic motion and other factors, they do not remain separated during the carrier transport process, potentially leading to rapid carrier recombination. Here, we utilized real-time time-dependent density functional theory in combination with nonadiabatic molecular dynamics (NAMD) to explore the separated dynamic transport path within Ruddlesden-Popper oxysulfide perovskite Y2Ti2O5S2 caused by the dielectric layer and phonon frequency difference. The underlying origin of the efficient overall water splitting in Y2Ti2O5S2 is systematically explored. We report the existence of the bi-directional e-h separate-path transport, in which, the electrons transport in the Ti2O5 layer and the holes diffuse in the rock-salt layer. This is in contrast to the conventional e-h separated distribution with a crowded transport channel, as observed in SrTiO3 and hybrid perovskites. Such a unique feature finally results in a long carrier lifetime of 321 ns, larger than that in the SrTiO3 perovskite (160 ns) with only one carrier transport channel. This work provides insights into the carrier transport in lead-free perovskites and yields a novel design strategy for next-generation functionalized optoelectronic devices.
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Affiliation(s)
- Yisen Yao
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China.
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Qiaoqiao Li
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Weibin Chu
- Key Laboratory of Computational Physical Sciences (Ministry of Education), Institute of Computational Physical Sciences, Fudan University, Shanghai 200433, China
| | - Yi-Min Ding
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China.
| | - Luo Yan
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Yang Gao
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China.
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Arup Neogi
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Alexander Govorov
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
- Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA.
| | - Liujiang Zhou
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China.
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Zhiming Wang
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China.
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
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Lin L, Kaewdee P, Nandal V, Shoji R, Matsuzaki H, Seki K, Nakabayashi M, Shibata N, Tao X, Liang X, Ma Y, Hisatomi T, Takata T, Domen K. Flux-Assisted Synthesis of Y 2 Ti 2 O 5 S 2 for Photocatalytic Hydrogen and Oxygen Evolution Reactions. Angew Chem Int Ed Engl 2023; 62:e202310607. [PMID: 37653542 DOI: 10.1002/anie.202310607] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 08/31/2023] [Accepted: 08/31/2023] [Indexed: 09/02/2023]
Abstract
Photocatalytic water splitting is an ideal means of producing hydrogen in a sustainable manner, and developing highly efficient photocatalysts is a vital aspect of realizing this process. The photocatalyst Y2 Ti2 O5 S2 (YTOS) is capable of absorbing at wavelengths up to 650 nm and exhibits outstanding thermal and chemical durability compared with other oxysulfides. However, the photocatalytic performance of YTOS synthesized using the conventional solid-state reaction (SSR) process is limited owing to the large particle sizes and structural defects associated with this synthetic method. Herein, we report the synthesis of YTOS particles by a flux-assisted technique. The enhanced mass transfer efficiency in the flux significantly reduced the preparation time compared with the SSR method. In addition, the resulting YTOS showed improved photocatalytic H2 and O2 evolution activity when loaded with Rh and Co3 O4 co-catalysts, respectively. These improvements are attributed to the reduced particle size and enhanced crystallinity of the material as well as the slower decay of photogenerated carriers on a nanosecond to sub-microsecond time range. Further optimization of this flux-assisted method together with suitable surface modification is expected to produce high-quality YTOS crystals with superior photocatalytic activity.
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Affiliation(s)
- Lihua Lin
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University Nagano-shi, Nagano, 380-8553, Japan
| | - Pongpen Kaewdee
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University Nagano-shi, Nagano, 380-8553, Japan
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
| | - Vikas Nandal
- Global Zero Emission Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 16-1 Onogawa, Tsukuba, Ibaraki, 305-8569, Japan
| | - Ryota Shoji
- Research Institute for Material and Chemical Measurement, National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
| | - Hiroyuki Matsuzaki
- Research Institute for Material and Chemical Measurement, National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
| | - Kazuhiko Seki
- Global Zero Emission Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 16-1 Onogawa, Tsukuba, Ibaraki, 305-8569, Japan
| | - Mamiko Nakabayashi
- Institute of Engineering Innovation, The University of Tokyo, Tokyo, 113-8656, Japan
| | - Naoya Shibata
- Institute of Engineering Innovation, The University of Tokyo, Tokyo, 113-8656, Japan
| | - Xiaoping Tao
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University Nagano-shi, Nagano, 380-8553, Japan
| | - Xizhuang Liang
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University Nagano-shi, Nagano, 380-8553, Japan
| | - Yiwen Ma
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University Nagano-shi, Nagano, 380-8553, Japan
| | - Takashi Hisatomi
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University Nagano-shi, Nagano, 380-8553, Japan
| | - Tsuyoshi Takata
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University Nagano-shi, Nagano, 380-8553, Japan
| | - Kazunari Domen
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University Nagano-shi, Nagano, 380-8553, Japan
- Office of University Professors, The University of Tokyo, Tokyo, 113-8656, Japan
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5
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Yao Y, Li Q, Ding YM, Yan L, Chen W, Govorov A, Wang Z, Zhou L. Theoretical Dissection of Cation-Deficient Layered Ruddlesden-Popper Oxysulfide Perovskites with a High-Efficiency Carrier Transport Channel. J Phys Chem Lett 2023; 14:9075-9081. [PMID: 37788153 DOI: 10.1021/acs.jpclett.3c02255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
The search for lead-free perovskite materials has triggered intensive interest. Here, we study the electronic structures and optical properties of cation-deficient Ruddlesden-Popper oxysulfide perovskites Ln2Ti2O5S2 (Ln = Sc, Y, or La), with a tunable band gap of 1.45-2.1 eV and a small exciton binding energy of ∼0.1 eV, among which Y2Ti2O5S2 has been synthesized experimentally. Sc2Ti2O5S2 possesses the largest light absorbance in the visible region. We further rationalize the light absorption via the transition dipole moment and suggest potential applications of Sc2Ti2O5S2 in solar cells and Y2Ti2O5S2 and La2Ti2O5S2 in water splitting. In addition, this family exhibits small effective masses within the x-y plane and large ones along the z direction. Most importantly, electron gas-like carrier behaviors are observed within the Ti-O bond region, offering a diffusion channel for electron transport. These findings greatly advance our understanding of lead-free perovskites and offer a novel material platform for future optoelectronic devices.
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Affiliation(s)
- Yisen Yao
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Qiaoqiao Li
- School of Physics, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Yi-Min Ding
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China
| | - Luo Yan
- School of Physics, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Weiwu Chen
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China
| | - Alexander Govorov
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
- Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, United States
| | - Zhiming Wang
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Liujiang Zhou
- School of Physics, University of Electronic Science and Technology of China, Chengdu 611731, China
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China
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6
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Brlec K, Savory CN, Scanlon DO. Understanding the electronic structure of Y 2Ti 2O 5S 2 for green hydrogen production: a hybrid-DFT and GW study. JOURNAL OF MATERIALS CHEMISTRY. A 2023; 11:16776-16787. [PMID: 38014403 PMCID: PMC10408711 DOI: 10.1039/d3ta02801a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Accepted: 07/20/2023] [Indexed: 11/29/2023]
Abstract
Utilising photocatalytic water splitting to produce green hydrogen is the key to reducing the carbon footprint of this crucial chemical feedstock. In this study, density functional theory (DFT) is employed to gain insights into the photocatalytic performance of an up-and-coming photocatalyst Y2Ti2O5S2 from first principles. Eleven non-polar clean surfaces are evaluated at the generalised gradient approximation level to obtain a plate-like Wulff shape that agrees well with the experimental data. The (001), (101) and (211) surfaces are considered further at hybrid-DFT level to determine their band alignments with respect to vacuum. The large band offset between the basal (001) and side (101) and (211) surfaces confirms experimentally observed spatial separation of hydrogen and oxygen evolution facets. Furthermore, relevant optoelectronic bulk properties were established using a combination of hybrid-DFT and many-body perturbation theory. The optical absorption of Y2Ti2O5S2 weakly onsets due to dipole-forbidden transitions, and hybrid Wannier-Mott/Frenkel excitonic behaviour is predicted to occur due to the two-dimensional electronic structure, with an exciton binding energy of 0.4 eV.
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Affiliation(s)
- Katarina Brlec
- Department of Chemistry and Thomas Young Centre, University College London London UK
| | - Christopher N Savory
- Department of Chemistry and Thomas Young Centre, University College London London UK
| | - David O Scanlon
- Department of Chemistry and Thomas Young Centre, University College London London UK
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7
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jing Xu J, Wu K. Comprehensive review on multiple mixed-anion ligands, physicochemical performances and application prospects in metal oxysulfides. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2023.215139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
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8
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Zhang N, Han SS, Xie Y, Chen DL, Yao WD, Huang X, Liu W, Guo SP. Mixed Rare-Earth Chalcogenide Borate Eu 9-xRE xMgS 2B 20O 41 (RE = Sm, Gd) Featuring a 3D {[B 20O 41] 22-} ∞ Framework Connected by [B 6O 9(O 0.5) 6] 6- and [B 7O 13(O 0.5) 3] 8- Clusters. Inorg Chem 2023; 62:7681-7688. [PMID: 37148562 DOI: 10.1021/acs.inorgchem.2c04272] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Rare-earth (RE) chalcogenide borates are very rarely discovered in view of the difficulties in synthesis though they have demonstrated attractive physical performances. Here, the first mixed RE chalcogenide borates Eu5.4Sm3.6MgS2B20O41 (1) and Eu3Gd6MgS2B20O41 (2) are synthesized by combining RE, sulfur, and borate ions into one structure. They crystallize in the centrosymmetric hexagonal space group P63/m, and their 3D honeycomb-like {[B20O41]22-}∞ open frameworks are built by [B6O9(O0.5)6]6- and [B7O13(O0.5)3]8- polyanionic clusters and consolidated by Mg2+ ions; both of which are formed by BO4 tetrahedra and BO3 planar triangles. The coordination modes of RE ions are rare REO6S2 bicapped trigonal prisms and REO8S irregular polyhedra, and their band gaps are determined to be 2.25 and 2.22 eV, respectively. They exhibit antiferromagnetic interactions and distinct photocurrent responses. The corresponding theoretical calculations are also performed. The study of 1 and 2 perhaps stimulates interest in exploring new functional RE chalcogenide borates.
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Affiliation(s)
- Nan Zhang
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, P.R. China
| | - Shan-Shan Han
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, P.R. China
| | - Yun Xie
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, P.R. China
| | - Da-Li Chen
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, P.R. China
| | - Wen-Dong Yao
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, P.R. China
| | - Xiao Huang
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, P.R. China
| | - Wenlong Liu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, P.R. China
| | - Sheng-Ping Guo
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, P.R. China
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9
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Lin L, Polliotto V, Vequizo JJM, Tao X, Liang X, Ma Y, Hisatomi T, Takata T, Domen K. Surface modification of Y2Ti2O5S2 with Co3O4 co‐catalyst for photocatalytic oxygen evolution. CHEMPHOTOCHEM 2022. [DOI: 10.1002/cptc.202200209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Lihua Lin
- Shinshu Daigaku Research Initiative for Supra-Materials JAPAN
| | | | | | - Xiaoping Tao
- Shinshu Daigaku Research Initiative for Supra-Materials JAPAN
| | - Xizhuang Liang
- Shinshu Daigaku Research Initiative for Supra-Materials JAPAN
| | - Yiwen Ma
- Shinshu Daigaku Research Initiative for Supra-Materials JAPAN
| | | | - Tsuyoshi Takata
- Shinshu Daigaku Research Initiative for Supra-Materials JAPAN
| | - Kazunari Domen
- The University of Tokyo Department of Chemical System Engineering 7-3-1 Hongo 113-8656 Bunkyo-ku JAPAN
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Brlec K, Spooner KB, Skelton JM, Scanlon DO. Y 2Ti 2O 5S 2 - a promising n-type oxysulphide for thermoelectric applications. JOURNAL OF MATERIALS CHEMISTRY. A 2022; 10:16813-16824. [PMID: 36092377 PMCID: PMC9382646 DOI: 10.1039/d2ta04160j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 06/29/2022] [Indexed: 06/15/2023]
Abstract
Thermoelectric materials offer an unambiguous solution to the ever-increasing global demand for energy by harnessing the Seebeck effect to convert waste heat to electrical energy. Mixed-anion materials are ideal candidate thermoelectric materials due to their thermal stability and potential for "phonon-glass, electron-crystal" behaviour. In this study, we use density-functional theory (DFT) calculations to investigate Y2Ti2O5S2, a cation-deficient Ruddlesden-Popper system, as a potential thermoelectric. We use hybrid DFT to calculate the electronic structure and band alignment, which indicate a preference for n-type doping with highly anisotropic in-plane and the out-of-plane charge-carrier mobilities as a result of the anisotropy in the crystal structure. We compute phonon spectra and calculate the lattice thermal conductivity within the single-mode relaxation-time approximation using lifetimes obtained by considering three-phonon interactions. We also calculate the transport properties using the momentum relaxation-time approximation to solve the electronic Boltzmann transport equations. The predicted transport properties and lattice thermal conductivity suggest a maximum in-plane ZT of 1.18 at 1000 K with a carrier concentration of 2.37 × 1020 cm-3. Finally, we discuss further the origins of the low lattice thermal conductivity, in particular exploring the possibility of nanostructuring to lower the phonon mean free path, reduce the thermal conductivity, and further enhance the ZT. Given the experimentally-evidenced high thermal stability and the favourable band alignment found in this work, Y2Ti2O5S2 has the potential to be a promising high-temperature n-type thermoelectric.
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Affiliation(s)
- Katarina Brlec
- Department of Chemistry, University College London 20 Gordon Street London UK
- Thomas Young Centre, University College London Gower Street London UK
| | - Kieran B Spooner
- Department of Chemistry, University College London 20 Gordon Street London UK
- Thomas Young Centre, University College London Gower Street London UK
| | - Jonathan M Skelton
- Department of Chemistry, University of Manchester Oxford Road Manchester UK
| | - David O Scanlon
- Department of Chemistry, University College London 20 Gordon Street London UK
- Thomas Young Centre, University College London Gower Street London UK
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11
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Chatterjee K, Skrabalak SE. Durable Metal Heteroanionic Photocatalysts. ACS APPLIED MATERIALS & INTERFACES 2021; 13:36670-36678. [PMID: 34319712 DOI: 10.1021/acsami.1c09774] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Heterogeneous photocatalysis provides a promising strategy to generate renewable fuels by harnessing solar energy. Metal heteroanionic photocatalysts have gained attention for their visible-light absorption; however, they are also plagued by photocorrosion, which limits their long-term use. Such photocorrosion occurs from photooxidation of the less electronegative nonoxide ions, leading to decomposition of the material's lattice. In this Perspective, we highlight emerging strategies to develop durable metal heteroanionic photocatalysts. We devote attention to the approaches taken for model metal oxynitrides, oxysulfides, and oxyhalide photocatalysts to provide a holistic framework. This analysis emphasizes the vital roles that interface engineering, charge carrier extraction, and crystal and electronic structure play in providing photodurability. We believe that through these approaches, durable and visible-light-absorbing artificial photosynthetic systems can be developed for a sustainable future.
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Affiliation(s)
- Kaustav Chatterjee
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Sara E Skrabalak
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
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Lu ZT, Yang SH, Liu W, Guo SP. A series of oxysulfides RE 2M 2S 3O 4 (RE = Y, Tm; M = Zr, Hf) featuring a unique MS 3O 4 motif and {[M 2S 3O 4] 8-} ∞ wrinkle layer. Chem Commun (Camb) 2021; 57:3500-3503. [PMID: 33690763 DOI: 10.1039/d1cc00351h] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Inorganic salts with multiple anions have recently received increasing interest in view of their structural diversity and multifunctional properties, and oxysulfides are one type of such salts. Here, three novel oxysulfides Y2Zr2S3O4 (1), Y2Hf2S3O4 (2), and Tm2Z2S3O4 (3) are obtained by high-temperature solid-state reactions. They crystallize with the orthorhombic space group Pbam and their three-dimensional structures featuring MS3O4 (M = Zr, Hf) motifs built an unprecedented {[M2S3O4]8-}∞ wrinkle layer. Their optical band gaps are determined and 3 shows antiferromagnetic-like behavior. Theoretical calculations suggest their direct band gaps and the electron transfer between the frontier orbitals mainly occurred from S-3p and O-2p, to Y-4d and Zr-4d/Hf-5d orbitals.
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Affiliation(s)
- Zhen-Tao Lu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, P. R. China.
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13
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Larquet C, Carenco S. Metal Oxysulfides: From Bulk Compounds to Nanomaterials. Front Chem 2020; 8:179. [PMID: 32296676 PMCID: PMC7136583 DOI: 10.3389/fchem.2020.00179] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Accepted: 02/26/2020] [Indexed: 11/30/2022] Open
Abstract
This review summarizes the syntheses and applications of metal oxysulfides. Bulk compounds of rare earth and transition metals are discussed in the section Introduction. After a presentation of their main properties and applications, their structures are presented and their syntheses are discussed. The section Bulk Materials and Their Main Applications is dedicated to the growing field of nanoscaled metal oxysulfides. Synthesis and applications of lanthanide-based nanoparticles are more mature and are discussed first. Then, works on transition-metal based nanoparticles are presented and discussed. Altogether, this review highlights the opportunities offered by metal oxysulfides for application in a range of technological fields, in relation with the most advanced synthetic routes and characterization techniques.
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Affiliation(s)
- Clément Larquet
- Sorbonne Université, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, LCMCP, Paris, France
- Sorbonne Université, CNRS, IRD, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmologie, IMPMC, Paris, France
| | - Sophie Carenco
- Sorbonne Université, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, LCMCP, Paris, France
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14
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Wang Q, Domen K. Particulate Photocatalysts for Light-Driven Water Splitting: Mechanisms, Challenges, and Design Strategies. Chem Rev 2019; 120:919-985. [PMID: 31393702 DOI: 10.1021/acs.chemrev.9b00201] [Citation(s) in RCA: 740] [Impact Index Per Article: 148.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Solar-driven water splitting provides a leading approach to store the abundant yet intermittent solar energy and produce hydrogen as a clean and sustainable energy carrier. A straightforward route to light-driven water splitting is to apply self-supported particulate photocatalysts, which is expected to allow solar hydrogen to be competitive with fossil-fuel-derived hydrogen on a levelized cost basis. More importantly, the powder-based systems can lend themselves to making functional panels on a large scale while retaining the intrinsic activity of the photocatalyst. However, all attempts to generate hydrogen via powder-based solar water-splitting systems to date have unfortunately fallen short of the efficiency values required for practical applications. Photocatalysis on photocatalyst particles involves three sequential steps: (i) absorption of photons with higher energies than the bandgap of the photocatalysts, leading to the excitation of electron-hole pairs in the particles, (ii) charge separation and migration of these photoexcited carriers, and (iii) surface chemical reactions based on these carriers. In this review, we focus on the challenges of each step and summarize material design strategies to overcome the obstacles and limitations. This review illustrates that it is possible to employ the fundamental principles underlying photosynthesis and the tools of chemical and materials science to design and prepare photocatalysts for overall water splitting.
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Affiliation(s)
- Qian Wang
- Department of Chemical System Engineering, School of Engineering , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 113-8656 , Japan
| | - Kazunari Domen
- Department of Chemical System Engineering, School of Engineering , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 113-8656 , Japan.,Center for Energy & Environmental Science , Shinshu University , 4-17-1 Wakasato , Nagano-shi , Nagano 380-8553 , Japan
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15
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Harada JK, Charles N, Poeppelmeier KR, Rondinelli JM. Heteroanionic Materials by Design: Progress Toward Targeted Properties. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1805295. [PMID: 30861235 DOI: 10.1002/adma.201805295] [Citation(s) in RCA: 90] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 01/16/2019] [Indexed: 05/16/2023]
Abstract
The burgeoning field of anion engineering in oxide-based compounds aims to tune physical properties by incorporating additional anions of different size, electronegativity, and charge. For example, oxychalcogenides, oxynitrides, oxypnictides, and oxyhalides may display new or enhanced responses not readily predicted from or even absent in the simpler homoanionic (oxide) compounds because of their proximity to the ionocovalent-bonding boundary provided by contrasting polarizabilities of the anions. In addition, multiple anions allow heteroanionic materials to span a more complex atomic structure design palette and interaction space than the homoanionic oxide-only analogs. Here, established atomic and electronic principles for the rational design of properties in heteroanionic materials are contextualized. Also described are synergistic quantum mechanical methods and laboratory experiments guided by these principles to achieve superior properties. Lastly, open challenges in both the synthesis and the understanding and prediction of the electronic, optical, and magnetic properties afforded by anion-engineering principles in heteroanionic materials are reviewed.
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Affiliation(s)
- Jaye K Harada
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Nenian Charles
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | | | - James M Rondinelli
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
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16
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Valldor M, Merz P, Prots Y, Schnelle W. Bad‐Metal‐Layered Sulfide Oxide CsV
2
S
2
O. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201501154] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Martin Valldor
- Max Planck Institute for Chemical Physics of Solids Nöthnitzer Straße 40, 01189 Dresden, Germany, http://www.cpfs.mpg.de/
| | - Patrick Merz
- Max Planck Institute for Chemical Physics of Solids Nöthnitzer Straße 40, 01189 Dresden, Germany, http://www.cpfs.mpg.de/
| | - Yurii Prots
- Max Planck Institute for Chemical Physics of Solids Nöthnitzer Straße 40, 01189 Dresden, Germany, http://www.cpfs.mpg.de/
| | - Walter Schnelle
- Max Planck Institute for Chemical Physics of Solids Nöthnitzer Straße 40, 01189 Dresden, Germany, http://www.cpfs.mpg.de/
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17
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Batuk M, Batuk D, Abakumov AM, Hadermann J. Pb5Fe3TiO11Cl: A rare example of Ti(IV) in a square pyramidal oxygen coordination. J SOLID STATE CHEM 2014. [DOI: 10.1016/j.jssc.2014.04.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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18
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Luo ZZ, Lin CS, Cheng WD, Li YB, Zhang H, Zhang WL, He ZZ. Syntheses and characterizations of compounds Ba4F4XGa2S6 (X = Cr, Mn, Fe) and Ba4F4MnIn2S6 with 2D layered structures. Dalton Trans 2013; 42:9938-45. [DOI: 10.1039/c3dt50483b] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Maeda K, Takata T, Domen K. (Oxy)nitrides and Oxysulfides as Visible-Light-Driven Photocatalysts for Overall Water Splitting. ACTA ACUST UNITED AC 2011. [DOI: 10.1007/978-0-85729-638-2_14] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
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20
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Ranmohotti KGS, Josepha E, Choi J, Zhang J, Wiley JB. Topochemical manipulation of perovskites: low-temperature reaction strategies for directing structure and properties. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:442-460. [PMID: 21254250 DOI: 10.1002/adma.201002274] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Topochemical reaction strategies offer an important low-temperature (<500 °C) approach to the conscious manipulation of various inorganic host materials, allowing access to compounds that cannot be prepared by standard high-temperature methods. As the utility of these strategies continues to expand, researchers will be able to more effectively target materials with technologically significant properties. This Progress Report presents recent advances in topochemical reaction strategies as applied to perovskite and perovskite-related compounds. Emphasis is placed on structural modifications and corresponding variations in properties. Additionally, the future prospects of this approach to the rational design of intricate target compounds are discussed.
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Affiliation(s)
- K G Sanjaya Ranmohotti
- Department of Chemistry and Advanced, Materials Research Institute, University of New Orleans, LA 70148, USA
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21
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Helps RM, Rees NH, Hayward MA. Sr(3)Co(2)O(4.33)h(0.84): an extended transition metal oxide-hydride. Inorg Chem 2010; 49:11062-8. [PMID: 21033678 DOI: 10.1021/ic101613b] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Reaction of the n = 2 Ruddlesden-Popper oxide Sr(3)Co(2)O(5.80) with CaH(2) yields an extended oxide-hydride phase: Sr(3)Co(2)O(4.33)H(0.84). Neutron powder diffraction data reveal the material adopts a body-centered orthorhombic structure (Immm: a = 3.7551(5) Å, b = 3.7048(4) Å, c = 21.480(3) Å) in which the hydride ions are accommodated within disordered CoO(1.16)H(0.46) layers. Low temperature neutron powder diffraction data show no evidence for long-range magnetic order, suggesting the chemical disorder in the anion lattice of the material leads to magnetic frustration.
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Affiliation(s)
- Rebecca M Helps
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, United Kingdom
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22
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Clarke SJ, Adamson P, Herkelrath SJC, Rutt OJ, Parker DR, Pitcher MJ, Smura CF. Structures, Physical Properties, and Chemistry of Layered Oxychalcogenides and Oxypnictides. Inorg Chem 2008; 47:8473-86. [DOI: 10.1021/ic8009964] [Citation(s) in RCA: 159] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Simon J. Clarke
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K
| | - Paul Adamson
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K
| | - Sebastian J. C. Herkelrath
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K
| | - Oliver J. Rutt
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K
| | - Dinah R. Parker
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K
| | - Michael J. Pitcher
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K
| | - Catherine F. Smura
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K
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23
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Altmannshofer S, Johrendt D. Synthesis, Crystal Structure and Magnetism of the New Oxysulfide Ce3NbO4S3. Z Anorg Allg Chem 2008. [DOI: 10.1002/zaac.200800078] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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24
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Kabbour H, Janod E, Corraze B, Danot M, Lee C, Whangbo MH, Cario L. Structure and Magnetic Properties of Oxychalcogenides A2F2Fe2OQ2 (A = Sr, Ba; Q = S, Se) with Fe2O Square Planar Layers Representing an Antiferromagnetic Checkerboard Spin Lattice. J Am Chem Soc 2008; 130:8261-70. [DOI: 10.1021/ja711139g] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Houria Kabbour
- Institut des Matériaux Jean Rouxel, CNRS-Université de Nantes, 2 rue de la Houssinière, BP32229, 44322 Nantes, France, and Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
| | - Etienne Janod
- Institut des Matériaux Jean Rouxel, CNRS-Université de Nantes, 2 rue de la Houssinière, BP32229, 44322 Nantes, France, and Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
| | - Benoît Corraze
- Institut des Matériaux Jean Rouxel, CNRS-Université de Nantes, 2 rue de la Houssinière, BP32229, 44322 Nantes, France, and Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
| | - Michel Danot
- Institut des Matériaux Jean Rouxel, CNRS-Université de Nantes, 2 rue de la Houssinière, BP32229, 44322 Nantes, France, and Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
| | - Changhoon Lee
- Institut des Matériaux Jean Rouxel, CNRS-Université de Nantes, 2 rue de la Houssinière, BP32229, 44322 Nantes, France, and Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
| | - Myung-Hwan Whangbo
- Institut des Matériaux Jean Rouxel, CNRS-Université de Nantes, 2 rue de la Houssinière, BP32229, 44322 Nantes, France, and Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
| | - Laurent Cario
- Institut des Matériaux Jean Rouxel, CNRS-Université de Nantes, 2 rue de la Houssinière, BP32229, 44322 Nantes, France, and Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
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Kabbour H, Cario L. Ba2F2Fe2+0.5Fe3+S3: A Two-Dimensional Inhomogeneous Mixed Valence Iron Compound. Inorg Chem 2008; 47:1648-52. [DOI: 10.1021/ic702021s] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Houria Kabbour
- Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS, 2 rue de la Houssinière B.P. 32229, 44322 Nantes Cedex 3, France
| | - Laurent Cario
- Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS, 2 rue de la Houssinière B.P. 32229, 44322 Nantes Cedex 3, France
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26
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Meignen V, Meerschaut A, Cario L, Lafond A. Synthesis and crystal structure of a new oxychalcogenide La5Ti∼3.25Zr∼0.25S5O9.25. J SOLID STATE CHEM 2005. [DOI: 10.1016/j.jssc.2005.03.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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27
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Crystal structures of two new oxysulfides La5Ti2MS5O7 (M=Cu, Ag): evidence of anionic segregation. J SOLID STATE CHEM 2004. [DOI: 10.1016/j.jssc.2004.04.023] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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28
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Crystal structure and electrical properties of the mixed valent titanium oxysulfide Sm2Ti2S2O4.5. J SOLID STATE CHEM 2004. [DOI: 10.1016/j.jssc.2004.04.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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29
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Hyett G, Rutt OJ, Gál ZA, Denis SG, Hayward MA, Clarke SJ. Electronically Driven Structural Distortions in Lithium Intercalates of the n = 2 Ruddlesden−Popper-Type Host Y2Ti2O5S2: Synthesis, Structure, and Properties of LixY2Ti2O5S2 (0 < x < 2). J Am Chem Soc 2004; 126:1980-91. [PMID: 14971931 DOI: 10.1021/ja037763h] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Lithium intercalation into the oxide slabs of the cation-deficient n = 2 Ruddlesden-Popper oxysulfide Y(2)Ti(2)O(5)S(2) to produce Li(x)Y(2)Ti(2)O(5)S(2) (0 < x < 2) is described. Neutron powder diffraction measurements reveal that at low levels of lithium intercalation into Y(2)Ti(2)O(5)S(2), the tetragonal symmetry of the host is retained: Li(0.30(5))Y(2)Ti(2)O(5)S(2), I4/mmm, a = 3.80002(2) A, c = 22.6396(2) A, Z = 2. The lithium ion occupies a site coordinated by four oxide ions in an approximately square planar geometry in the perovskite-like oxide slabs of the structure. At higher levels of lithium intercalation, the symmetry of the cell is lowered to orthorhombic: Li(0.99(5))Y(2)Ti(2)O(5)S(2), Immm, a = 3.82697(3) A, b = 3.91378(3) A, c = 22.2718(2) A, Z = 2, with ordering of Li(+) ions over two inequivalent sites. At still higher levels of lithium intercalation, tetragonal symmetry is regained: Li(1.52(5))Y(2)Ti(2)O(5)S(2), I4/mmm, a = 3.91443(4) A, c = 22.0669(3) A, Z = 2. A phase gap exists close to the transition from the tetragonal to orthorhombic structures (0.6 < x < 0.8). The changes in symmetry of the system with electron count may be considered analogous to a cooperative electronically driven Jahn-Teller type distortion. Magnetic susceptibility and resistivity measurements are consistent with metallic properties for x > 1, and the two-phase region is identified as coincident with an insulator to metal transition.
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Affiliation(s)
- Geoffrey Hyett
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK
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Ijjaali I, Mitchell K, Haynes CL, McFarland AD, Van Duyne RP, Ibers JA. Synthesis, crystal structure, and optical properties of CeMn0.5OSe. J SOLID STATE CHEM 2003. [DOI: 10.1016/s0022-4596(03)00385-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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31
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Rutt OJ, Hill TL, Gál ZA, Hayward MA, Clarke SJ. The Cation-Deficient Ruddlesden−Popper Oxysulfide Y2Ti2O5S2 as a Layered Sulfide: Topotactic Potassium Intercalation To Form KY2Ti2O5S2. Inorg Chem 2003; 42:7906-11. [PMID: 14632507 DOI: 10.1021/ic0301730] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Potassium intercalation into the cation-deficient n = 2 Ruddlesden-Popper oxysulfide Y(2)Ti(2)O(5)S(2) to form KY(2)Ti(2)O(5)S(2) has been carried out by reaction of the oxysulfide with potassium vapor in sealed metal tubes at 400 degrees C, potassium naphthalide in THF at 50 degrees C, or potassium in liquid ammonia at temperatures as low as -78 degrees C. Insertion of potassium is topotactic, and although a site 12-coordinate by oxide ions is vacant in the perovskite-type oxide slabs of the structure, potassium is too large to enter this site via the 4-coordinate window, and instead enters the rock-salt-type sulfide layers of the structure which necessitates a 30% increase in the lattice parameter c normal to the layers. In contrast with one of the sodium intercalates of Y(2)Ti(2)O(5)S(2) (beta-NaY(2)Ti(2)O(5)S(2)) in which sodium occupies a tetrahedral site in the sulfide layers, potassium favors an 8-coordinate site which necessitates a relative translation of adjacent oxide slabs. KY(2)Ti(2)O(5)S(2) is tetragonal: P4/mmm, a = 3.71563(4) A, c = 14.8682(2) A (at 298 K), Z = 1. Although the resistivity (3.4(1) x 10(3) Omega cm) is larger than would be expected for a metal, temperature independent paramagnetism dominates the magnetic susceptibility, and the material is electronically very similar to the analogous sodium intercalate beta-NaY(2)Ti(2)O(5)S(2) which features reduced-titanium-containing oxide layers of very similar geometry and electron count.
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Affiliation(s)
- Oliver J Rutt
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, UK
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Ishikawa A, Takata T, Kondo JN, Hara M, Kobayashi H, Domen K. Oxysulfide Sm(2)Ti(2)S(2)O(5) as a stable photocatalyst for water oxidation and reduction under visible light irradiation (lambda < or = 650 nm). J Am Chem Soc 2002; 124:13547-53. [PMID: 12418910 DOI: 10.1021/ja0269643] [Citation(s) in RCA: 414] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A Ti-based oxysulfide, Sm(2)Ti(2)S(2)O(5), was studied as a visible light-driven photocatalyst. Under visible light (440 nm < or = lambda < or = 650 nm) irradiation, Sm(2)Ti(2)S(2)O(5) with a band gap of approximately 2 eV evolved H(2) or O(2) from aqueous solutions containing a sacrificial electron donor (Na(2)S-Na(2)SO(3) or methanol) or acceptor (Ag(+)) without any noticeable degradation. This oxysulfide is, therefore, a stable photocatalyst with strong reduction and oxidation abilities under visible-light irradiation. The electronic band structure of Sm(2)Ti(2)S(2)O(5) was calculated using the plane-wave-based density functional theory (DFT) program. It was elucidated that the S3p orbitals constitute the upper part of the valence band and these orbitals make an essential contribution to the small band gap energy. The conduction and valence bands' positions of Sm(2)Ti(2)S(2)O(5) were also determined by electrochemical measurements. It indicated that conduction and valence bands were found to have satisfactory potentials for the reduction of H(+) to H(2) and the oxidation of H(2)O to O(2) at pH = 8. This is consistent with the results of the photocatalytic reactions.
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Affiliation(s)
- Akio Ishikawa
- Chemical Resources Laboratory, Tokyo Institute of Technology, Nagatsuta 4259, Midori-ku, Yokohama 226-8503, Japan
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The Family of Ln2Ti2S2O5 Compounds (Ln=Nd, Sm, Gd, Tb, Dy, Ho, Er, and Y): Optical Properties. J SOLID STATE CHEM 2002. [DOI: 10.1006/jssc.2002.9492] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Meerschaut A, Lafond A, Meignen V, Deudon C. Crystal Structure and Magnetic Properties of a New Oxyselenide of Gadolinium and Titanium: Gd4TiSe4O4. J SOLID STATE CHEM 2001. [DOI: 10.1006/jssc.2001.9223] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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35
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Syntheses and Crystal Structures of the Lanthanum Titanium Oxyselenides La4Ti2O4Se5 and La6Ti3O5Se9. J SOLID STATE CHEM 2001. [DOI: 10.1006/jssc.2000.9060] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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