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Chen HY, Versteeg RB, Mankowsky R, Puppin M, Leroy L, Sander M, Deng Y, Oggenfuss RA, Zamofing T, Böhler P, Pradervand C, Mozzanica A, Vetter S, Smolentsev G, Kerkhoff L, Lemke HT, Chergui M, Mancini GF. A setup for hard x-ray time-resolved resonant inelastic x-ray scattering at SwissFEL. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2024; 11:024308. [PMID: 38586277 PMCID: PMC10998714 DOI: 10.1063/4.0000236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Accepted: 03/04/2024] [Indexed: 04/09/2024]
Abstract
We present a new setup for resonant inelastic hard x-ray scattering at the Bernina beamline of SwissFEL with energy, momentum, and temporal resolution. The compact R = 0.5 m Johann-type spectrometer can be equipped with up to three crystal analyzers and allows efficient collection of RIXS spectra. Optical pumping for time-resolved studies can be realized with a broad span of optical wavelengths. We demonstrate the performance of the setup at an overall ∼180 meV resolution in a study of ground-state and photoexcited (at 400 nm) honeycomb 5d iridate α-Li2IrO3. Steady-state RIXS spectra at the iridium L3-edge (11.214 keV) have been collected and are in very good agreement with data collected at synchrotrons. The time-resolved RIXS transients exhibit changes in the energy loss region <2 eV, whose features mostly result from the hopping nature of 5d electrons in the honeycomb lattice. These changes are ascribed to modulations of the Ir-to-Ir inter-site transition scattering efficiency, which we associate to a transient screening of the on-site Coulomb interaction.
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Affiliation(s)
- Hui-Yuan Chen
- Lausanne Centre for Ultrafast Science (LACUS), ISIC, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Rolf B. Versteeg
- Lausanne Centre for Ultrafast Science (LACUS), ISIC, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Roman Mankowsky
- SwissFEL, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | - Michele Puppin
- Lausanne Centre for Ultrafast Science (LACUS), ISIC, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | | | - Mathias Sander
- SwissFEL, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | - Yunpei Deng
- SwissFEL, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | | | - Thierry Zamofing
- SwissFEL, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | - Pirmin Böhler
- SwissFEL, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | - Claude Pradervand
- Photon Science Division, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | - Aldo Mozzanica
- Photon Science Division, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | - Seraphin Vetter
- Photon Science Division, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | - Grigory Smolentsev
- Energy and Environment Research Division, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | - Linda Kerkhoff
- Sect. Crystallography, Institute of Geology and Mineralogy, University of Cologne, 50674 Köln, Germany
| | - Henrik T. Lemke
- SwissFEL, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | - Majed Chergui
- Authors to whom correspondence should be addressed: and
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Zimmerli NK, Müller CR, Abdala PM. Deciphering the structure of heterogeneous catalysts across scales using pair distribution function analysis. TRENDS IN CHEMISTRY 2022. [DOI: 10.1016/j.trechm.2022.06.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Hirai S, Yagi S, Oh HC, Sato Y, Liu W, Liu EP, Chen WT, Miura A, Nagao M, Ohno T, Matsuda T. Highly active and stable surface structure for oxygen evolution reaction originating from balanced dissolution and strong connectivity in BaIrO 3 solid solutions. RSC Adv 2022; 12:24427-24438. [PMID: 36128544 PMCID: PMC9415035 DOI: 10.1039/d2ra04624e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Accepted: 08/22/2022] [Indexed: 12/02/2022] Open
Abstract
Catalysts for the oxygen evolution reaction (OER) are receiving great interest since OER remains the bottleneck of water electrolyzers for hydrogen production. Especially, OER in acidic solutions is crucial since it produces high current densities and avoids precipitation of carbonates. However, even the acid stable iridates undergo severe dissolution during the OER. BaIrO3 has the strongest IrO6 connectivity and stable surface structure, yet it suffers from lattice collapse after OER cycling, making it difficult to improve the OER durability. In the present study, we have successfully developed an OER catalyst with both high intrinsic activity and stability under acidic conditions by preventing the lattice collapse after repeated OER cycling. Specifically, we find that the substitution of Ir-site with Mn for BaIrO3 in combination with OER cycling leads to a remarkable activity enhancement by a factor of 28 and an overall improvement in stability. This dual enhancement of OER performance was accomplished by the novel strategy of slightly increasing the Ir-dissolution and balancing the elemental dissolution in BaIr1−xMnxO3 to reconstruct a rigid surface with BaIrO3-type structure. More importantly, the mass activity for BaIr0.8Mn0.2O3 reached ∼73 times of that for IrO2, making it a sustainable and promising OER catalyst for energy conversion technologies. We have prevented lattice collapse and developed an OER catalyst with both high activity and stability by slightly increasing Ir-dissolution and balancing the elemental dissolution in BaIr1−xMnxO3 for reconstructing the rigid catalytic surface.![]()
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Affiliation(s)
- Shigeto Hirai
- School of Earth, Energy and Environmental Engineering, Kitami Institute of Technology, 165 Koen-cho, Kitami 090-8507, Japan
| | - Shunsuke Yagi
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba Meguro-ku, Tokyo 153-8505, Japan
| | - He-Chan Oh
- School of Earth, Energy and Environmental Engineering, Kitami Institute of Technology, 165 Koen-cho, Kitami 090-8507, Japan
| | - Yoshiki Sato
- School of Earth, Energy and Environmental Engineering, Kitami Institute of Technology, 165 Koen-cho, Kitami 090-8507, Japan
| | - Wei Liu
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba Meguro-ku, Tokyo 153-8505, Japan
| | - En-Pei Liu
- Center for Condensed Matter Sciences and Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan
| | - Wei-Tin Chen
- Center for Condensed Matter Sciences and Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan
- Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, Taipei 10622, Taiwan
| | - Akira Miura
- Graduate School of Chemical Sciences and Engineering and Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - Masanori Nagao
- University of Yamanashi, 7-32 Miyamae, Kofu, Yamanashi 400-0021, Japan
| | - Tomoya Ohno
- School of Earth, Energy and Environmental Engineering, Kitami Institute of Technology, 165 Koen-cho, Kitami 090-8507, Japan
| | - Takeshi Matsuda
- School of Earth, Energy and Environmental Engineering, Kitami Institute of Technology, 165 Koen-cho, Kitami 090-8507, Japan
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