Title: Lattice site–dependent metal leaching in perovskites toward a honeycomb-like water oxidation catalyst

Journal Article · · Science Advances
ORCiD logo [1];  [2];  [3];  [2];  [2];  [4];  [2]; ORCiD logo [5];  [6]; ORCiD logo [6];  [7]; ORCiD logo [8]; ORCiD logo [3]; ORCiD logo [1]
  1. Nanyang Technological Univ. (Singapore); Cambridge Centre for Advanced Research and Education in Singapore (Singapore)
  2. Nanyang Technological Univ. (Singapore)
  3. Oregon State Univ., Corvallis, OR (United States)
  4. Agency for Science, Technology and Research (A*STAR) (Singapore)
  5. Lanzhou Univ. (China)
  6. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  7. Cambridge Centre for Advanced Research and Education in Singapore (Singapore); Univ. of Cambridge (United Kingdom)
  8. Univ. of California, Berkeley, CA (United States); Berkeley Educational Alliance for Research in Singapore, Ltd. (Singapore)

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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); National Research Foundation (NRF) Singapore; Oregon State University; Singapore Ministry of Education (MOE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357
OSTI ID:
1894054
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 50 Vol. 7; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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