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

doi:10.1021/acs.jpclett.6b02147

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: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

172 Citations (Scopus)

Abstract

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. © 2016 American Chemical Society.

Original language	English
Pages (from-to)	4847-4853
Journal	Journal of Physical Chemistry Letters
Volume	7
Issue number	23
DOIs	https://doi.org/10.1021/acs.jpclett.6b02147
Publication status	Published - 1 Dec 2016
Externally published	Yes

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title = "In situ spectroscopic identification of μ-OO bridging on spinel Co3O4 water oxidation electrocatalyst",

abstract = "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. {\textcopyright} 2016 American Chemical Society.",

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TY - JOUR

T1 - In situ spectroscopic identification of μ-OO bridging on spinel Co3O4 water oxidation electrocatalyst

AU - Wang, Hsin-Yi

AU - Hung, Sung-Fu

AU - Hsu, Ying-Ya

AU - Zhang, Lulu

AU - Miao, Jianwei

AU - Chan, Ting-Shan

AU - Xiong, Qihua

AU - Liu, Bin

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2016/12/1

Y1 - 2016/12/1

N2 - 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. © 2016 American Chemical Society.

AB - 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. © 2016 American Chemical Society.

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U2 - 10.1021/acs.jpclett.6b02147

DO - 10.1021/acs.jpclett.6b02147

M3 - RGC 21 - Publication in refereed journal

SN - 1948-7185

VL - 7

SP - 4847

EP - 4853

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

IS - 23

ER -