Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 138, Issue 1, Pages 36-39Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b10525
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Funding
- Nanyang Technological University [M4080977.120]
- Singapore Ministry of Education Academic Research Fund (AcRF) Tier 1 [M4011021.120]
- Singapore A*Star Science and Engineering Research Council - Public Sector Funding (PSF) [M4070232.120]
- National Research Foundation (NRF)
- Prime Minister's Office, Singapore under its Campus for Research Excellence and Technological Enterprise (CREATE) program
- Ministry of Science and Technology, Taiwan [MOST 104-2113-M-002-011-MY2]
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Spinel Co3O4, comprising two types of cobalt ions: one Co2+ in the tetrahedral site (Co-Td(2+)) and the other two Co3+ in the octahedral site (Co-Oh(3+)), has been widely explored as a promising oxygen evolution reaction (OER) catalyst for water electrolysis. However, the roles of two geometrical cobalt ions toward the OER have remained elusive. Here, we investigated the geometrical-site-dependent OER activity of Co3O4 catalyst by substituting Co-Td(2+) and Co-Oh(3+) with inactive Zn2+ and Al3+, respectively. Following a thorough in operando analysis by electrochemical impedance spectroscopy and X-ray absorption spectroscopy, it was revealed that Co-Td(2+) site is responsible for the formation of cobalt oxyhydroxide (CoOOH), which acted as the active site for water oxidation.
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