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

Hsin Yi Wang, Sung Fu Hung, Han Yi Chen, Ting Shan Chan, Hao Ming Chen*, Bin Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

363 Scopus citations

Abstract

Spinel Co3O4, comprising two types of cobalt ions: one Co2+ in the tetrahedral site (Co2+Td) and the other two Co3+ in the octahedral site (Co3+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 Co2+Td and Co3+Oh 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 Co2+Td site is responsible for the formation of cobalt oxyhydroxide (CoOOH), which acted as the active site for water oxidation.

Original languageEnglish
Pages (from-to)36-39
Number of pages4
JournalJournal of the American Chemical Society
Volume138
Issue number1
DOIs
StatePublished - 13 Jan 2016

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