Amorphization mechanism of SrIrO 3 electrocatalyst: How oxygen redox initiates ionic diffusion and structural reorganization.

Autor: Wan G; Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA., Freeland JW; X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA., Kloppenburg J; Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Chemin des Étoiles 8, B-1348 Louvain-la-Neuve, Belgium., Petretto G; Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Chemin des Étoiles 8, B-1348 Louvain-la-Neuve, Belgium., Nelson JN; Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA., Kuo DY; Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA., Sun CJ; X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA., Wen J; Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL 60439, USA., Diulus JT; School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, OR 97331, USA., Herman GS; School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, OR 97331, USA., Dong Y; Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA.; X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA.; National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China., Kou R; X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA., Sun J; Department of Physics and the Texas Center for Superconductivity, University of Houston, Houston, TX 77204, USA., Chen S; Department of Physics and the Texas Center for Superconductivity, University of Houston, Houston, TX 77204, USA., Shen KM; Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA.; Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY 14853, USA., Schlom DG; Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA.; Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY 14853, USA.; Leibniz-Institut für Kristallzüchtung, Max-Born-Str. 2, 12489 Berlin, Germany., Rignanese GM; Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Chemin des Étoiles 8, B-1348 Louvain-la-Neuve, Belgium., Hautier G; Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Chemin des Étoiles 8, B-1348 Louvain-la-Neuve, Belgium., Fong DD; Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA. fong@anl.gov zhenxing.feng@oregonstate.edu hzhou@aps.anl.gov jsuntivich@cornell.edu., Feng Z; School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, OR 97331, USA. fong@anl.gov zhenxing.feng@oregonstate.edu hzhou@aps.anl.gov jsuntivich@cornell.edu., Zhou H; X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA. fong@anl.gov zhenxing.feng@oregonstate.edu hzhou@aps.anl.gov jsuntivich@cornell.edu., Suntivich J; Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA. fong@anl.gov zhenxing.feng@oregonstate.edu hzhou@aps.anl.gov jsuntivich@cornell.edu.; Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY 14853, USA.
Jazyk: angličtina
Zdroj: Science advances [Sci Adv] 2021 Jan 08; Vol. 7 (2). Date of Electronic Publication: 2021 Jan 08 (Print Publication: 2021).
DOI: 10.1126/sciadv.abc7323
Abstrakt: The use of renewable electricity to prepare materials and fuels from abundant molecules offers a tantalizing opportunity to address concerns over energy and materials sustainability. The oxygen evolution reaction (OER) is integral to nearly all material and fuel electrosyntheses. However, very little is known about the structural evolution of the OER electrocatalyst, especially the amorphous layer that forms from the crystalline structure. Here, we investigate the interfacial transformation of the SrIrO 3 OER electrocatalyst. The SrIrO 3 amorphization is initiated by the lattice oxygen redox, a step that allows Sr 2+ to diffuse and O 2- to reorganize the SrIrO 3 structure. This activation turns SrIrO 3 into a highly disordered Ir octahedral network with Ir square-planar motif. The final Sr y IrO x exhibits a greater degree of disorder than IrO x made from other processing methods. Our results demonstrate that the structural reorganization facilitated by coupled ionic diffusions is essential to the disordered structure of the SrIrO 3 electrocatalyst.
(Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).)
Databáze: MEDLINE
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