title: In Situ Spectroscopic Identification of μ-OO Bridging on Spinel Co3O4Water Oxidation Electrocatalyst.
abstract: The formation of μ-OO peroxide (Co-OO-Co) moieties on spinel Co3O4electrocatalyst 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 Co3O4could be the vital species to initiate the formation of the μ-OO peroxide moieties.
authors.affiliation: School of Chemical and Biomedical Engineering, Nanyang Technological University , Block N1.2, 62 Nanyang Drive, Singapore 637459, Singapore.
authors.forename: Hsin-Yi
authors.initials: HY
authors.lastname: Wang
authors.affiliation: Department of Chemistry, National Taiwan University , Taipei 106, Taiwan, Republic of China.
authors.forename: Sung-Fu
authors.initials: SF
authors.lastname: Hung
authors.affiliation: National Synchrotron Radiation Research Center , Hsinchu 300, Taiwan, Republic of China.
authors.forename: Ying-Ya
authors.initials: YY
authors.lastname: Hsu
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore.
authors.forename: Lulu
authors.initials: L
authors.lastname: Zhang
authors.affiliation: School of Chemical and Biomedical Engineering, Nanyang Technological University , Block N1.2, 62 Nanyang Drive, Singapore 637459, Singapore.
authors.forename: Jianwei
authors.initials: J
authors.lastname: Miao
authors.affiliation: National Synchrotron Radiation Research Center , Hsinchu 300, Taiwan, Republic of China.
authors.forename: Ting-Shan
authors.initials: TS
authors.lastname: Chan
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore.
authors.forename: Qihua
authors.initials: Q
authors.lastname: Xiong
authors.affiliation: School of Chemical and Biomedical Engineering, Nanyang Technological University , Block N1.2, 62 Nanyang Drive, Singapore 637459, Singapore.
authors.forename: Bin
authors.initials: B
authors.lastname: Liu