In situ spectroscopic identification of μ-OO bridging on spinel Co3O4 water oxidation electrocatalyst

Hsin Yi Wang, Sung Fu Hung, Ying Ya Hsu, Lulu Zhang, Jianwei Miao, Ting Shan Chan, Qihua Xiong, Bin Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

57 Scopus citations


The formation of μ-OO peroxide (Co-OO-Co) moieties on spinel Co3O4 electrocatalyst prior to the rise of the electrochemical oxygen evolution reaction (OER) current was identified by in situ spectroscopic methods. Through a combination of independent in situ X-ray absorption, grazing-angle X-ray diffraction, and Raman analysis, we observed a clear coincidence between the formation of μ-OO peroxide moieties and the rise of the anodic peak during OER. This finding implies that a chemical reaction step could be generally ignored before the onset of OER current. More importantly, the tetrahedral Co2+ ions in the spinel Co3O4 could be the vital species to initiate the formation of the μ-OO peroxide moieties.

Original languageEnglish
Pages (from-to)4847-4853
Number of pages7
JournalJournal of Physical Chemistry Letters
Issue number23
StatePublished - 1 Dec 2016

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