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Title: Lattice site-dependent metal leaching in perovskites toward a honeycomb-like water oxidation catalyst
Authors: Chen, Yubo
Sun, Yuanmiao
Wang, Maoyu
Wang, Jingxian
Li, Haiyan
Xi, Shibo
Wei, Chao
Xi, Pinxian
Sterbinsky, George E.
Freeland, John W.
Fisher, Adrian C.
Ager, Joel W.
Feng, Zhenxing
Xu, Jason Zhichuan
Keywords: Engineering::Materials
Issue Date: 2021
Source: Chen, Y., Sun, Y., Wang, M., Wang, J., Li, H., Xi, S., Wei, C., Xi, P., Sterbinsky, G. E., Freeland, J. W., Fisher, A. C., Ager, J. W., Feng, Z. & Xu, J. Z. (2021). Lattice site-dependent metal leaching in perovskites toward a honeycomb-like water oxidation catalyst. Science Advances, 7(50), eabk1788-.
Project: MOE2018-T2-2-027 
Journal: Science Advances 
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.
ISSN: 2375-2548
DOI: 10.1126/sciadv.abk1788
Schools: School of Materials Science and Engineering 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 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 License 4.0 (CC BY).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles
MSE Journal Articles

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