Lattice site-dependent metal leaching in perovskites toward a honeycomb-like water oxidation catalyst.
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Authors
Sun, Yuanmiao
Wang, Maoyu
Wang, Jingxian
Li, Haiyan
Xi, Shibo
Wei, Chao
Sterbinsky, George E
Fisher, Adrian C
Publication Date
2021-12-10Journal Title
Sci Adv
ISSN
2375-2548
Publisher
American Association for the Advancement of Science (AAAS)
Volume
7
Issue
50
Language
eng
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Chen, Y., Sun, Y., Wang, M., Wang, J., Li, H., Xi, S., Wei, C., et al. (2021). Lattice site-dependent metal leaching in perovskites toward a honeycomb-like water oxidation catalyst.. Sci Adv, 7 (50) https://doi.org/10.1126/sciadv.abk1788
Abstract
Metal leaching during water oxidation has been typically observed in conjunction with surface reconstruction on perovskite oxide catalysts, but the role of metal leaching at each geometric site has not been distinguished. Here, we manipulate the occurrence and process of surface reconstruction in two model ABO3 perovskites, i.e., SrSc0.5Ir0.5O3 and SrCo0.5Ir0.5O3, which allow us to evaluate the structure and activity evolution step by step. The occurrence and order of leaching of Sr (A-site) and Sc/Co (B-site) were controlled by tailoring the thermodynamic stability of B-site. Sr leaching from A-site mainly generates more electrochemical surface area for the reaction, and additional leaching of Sc/Co from B-site triggers the formation of a honeycomb-like IrOxHy phase with a notable increase in intrinsic activity. A thorough surface reconstruction with dual-site metal leaching induces an activity improvement by approximately two orders of magnitude, which makes the reconstructed SrCo0.5Ir0.5O3 among the best for water oxidation in acid.
Identifiers
34890227, PMC8664262
External DOI: https://doi.org/10.1126/sciadv.abk1788
This record's URL: https://www.repository.cam.ac.uk/handle/1810/333114
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