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In Operando Identification of Geometrical-Site-Dependent Water Oxidation Activity of Spinel Co3O4

Wang, Hsin-Yi, Hung, Sung-Fu, Chen, Han-Yi, Chan, Ting-Shan, Chen, Hao Ming, Liu, Bin·2016·Journal of the American Chemical Society

Abstract

Spinel Co3O4, comprising two types of cobalt ions: one Co(2+) in the tetrahedral site (Co(2+)(Td)) and the other two Co(3+) in the octahedral site (Co(3+)(Oh)), 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(2+)(Td) and Co(3+)(Oh) with inactive Zn(2+) and Al(3+), respectively. Following a thorough in operando analysis by electrochemical impedance spectroscopy and X-ray absorption spectroscopy, it was revealed that Co(2+)Td site is responsible for the formation of cobalt oxyhydroxide (CoOOH), which acted as the active site for water oxidation.

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Metadata

Authors
Wang, H.-Y., Hung, S.-F., Chen, H.-Y., Chan, T.-S., Chen, H. M., & Liu, B.
Venue
Journal of the American Chemical Society
Published
2015-12-31
Volume
138
Issue
1
Pages
36-39
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W2221458734
Cited by
1,120
References
3
FWCI
17.99
Type
journal article
Language
en
Open access
closed

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