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Popov V, Menushenkov A, Yastrebtsev A, Molokova A, Pisarev A, Khramov E, Zubavichus Y, Shchetinin I, Ponkratov K, Tsarenko N, Ognevskaya N. The synthesis and studies of crystal/local structures and morphology of hydrated molybdenum oxides. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Lassalle-Kaiser B, Merki D, Vrubel H, Gul S, Yachandra VK, Hu X, Yano J. Evidence from in situ X-ray absorption spectroscopy for the involvement of terminal disulfide in the reduction of protons by an amorphous molybdenum sulfide electrocatalyst. J Am Chem Soc 2014; 137:314-21. [PMID: 25427231 PMCID: PMC4304453 DOI: 10.1021/ja510328m] [Citation(s) in RCA: 111] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The reduction of protons into dihydrogen is important because of its potential use in a wide range of energy applications. The preparation of efficient and cheap catalysts for this reaction is one of the issues that need to be tackled to allow the widespread use of hydrogen as an energy carrier. In this paper, we report the study of an amorphous molybdenum sulfide (MoSx) proton reducing electrocatalyst under functional conditions, using in situ X-ray absorption spectroscopy. We probed the local and electronic structures of both the molybdenum and sulfur elements for the as prepared material as well as the precatalytic and catalytic states. The as prepared material is very similar to MoS3 and remains unmodified under functional conditions (pH = 2 aqueous HNO3) in the precatalytic state (+0.3 V vs RHE). In its catalytic state (-0.3 V vs RHE), the film is reduced to an amorphous form of MoS2 and shows spectroscopic features that indicate the presence of terminal disulfide units. These units are formed concomitantly with the release of hydrogen, and we suggest that the rate-limiting step of the HER is the reduction and protonation of these disulfide units. These results show the implication of terminal disulfide chemical motifs into HER driven by transition-metal sulfides and provide insight into their reaction mechanism.
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Affiliation(s)
- Benedikt Lassalle-Kaiser
- Physical Biosciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
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Asakura K. Polarization-dependent total reflection fluorescence extended X-ray absorption fine structure and its application to supported catalysis. CATALYSIS 2012. [DOI: 10.1039/9781849734776-00281] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Polarization-dependent total reflection fluorescence-extended X-ray absorption fine structure (PTRF-EXAFS) is a powerful tool to investigate the structures of highly dispersed metal clusters on oxide surfaces that provide a model system for supported metal catalysts. PTRF-EXAFS provides three-dimensional structural information of the dispersed metal clusters, in addition to the metal-support interface structure in the presence of a gas phase. Results from PTRF-EXAFS have revealed that the metal species interacts strongly with surface anions. Finally the future of PTRF-EXAFS is discussed in combination with the next generation light sources, such as X-ray free electron laser (XFEL) and energy recovery linac (ERL).
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Affiliation(s)
- Kiyotaka Asakura
- Catalysis Research Center Hokkaido University Sapporo 001-0021 Japan.
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Tanizawa Y, Shido T, Chun WJ, Asakura K, Nomura M, Iwasawa Y. Three-Dimensional Structure Analyses of Cu Species Dispersed on TiO2(110) Surfaces Studied by Polarization-Dependent Total-Reflection Fluorescence X-ray Absorption Fine Structure (PTRF-XAFS). J Phys Chem B 2003. [DOI: 10.1021/jp0306186] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yasuhiro Tanizawa
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Catalysis Research Center (CRC), Hokkaido University, Kita 11-10, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK−IMSS−PF), Oho 1-1, Tsukuba 305-0801, Japan
| | - Takafumi Shido
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Catalysis Research Center (CRC), Hokkaido University, Kita 11-10, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK−IMSS−PF), Oho 1-1, Tsukuba 305-0801, Japan
| | - Wang-Jae Chun
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Catalysis Research Center (CRC), Hokkaido University, Kita 11-10, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK−IMSS−PF), Oho 1-1, Tsukuba 305-0801, Japan
| | - Kiyotaka Asakura
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Catalysis Research Center (CRC), Hokkaido University, Kita 11-10, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK−IMSS−PF), Oho 1-1, Tsukuba 305-0801, Japan
| | - Masaharu Nomura
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Catalysis Research Center (CRC), Hokkaido University, Kita 11-10, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK−IMSS−PF), Oho 1-1, Tsukuba 305-0801, Japan
| | - Yasuhiro Iwasawa
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Catalysis Research Center (CRC), Hokkaido University, Kita 11-10, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK−IMSS−PF), Oho 1-1, Tsukuba 305-0801, Japan
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