In Situ Spectroscopic Identification of μ-OO Bridging on Spinel Co3O4 Water Oxidation Electrocatalyst

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• 作者：Hsin-Yi Wang ; Sung-Fu Hung ; Ying-Ya Hsu ; Lulu Zhang ; Jianwei Miao ; Ting-Shan Chan ; Qihua Xiong ; Bin Liu
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2016
• 出版时间：December 1, 2016
• 年：2016
• 卷：7
• 期：23
• 页码：4847-4853
• 全文大小：531K
• ISSN：1948-7185

文摘

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.