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

*此作品的通信作者

研究成果: Article同行評審

595 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)36-39
頁數4
期刊Journal of the American Chemical Society
138
發行號1
DOIs
出版狀態Published - 13 1月 2016

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