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Heterointerface Created on Au-Cluster-Loaded Unilamellar Hydroxide Electrocatalysts as a Highly Active Site for the Oxygen Evolution Reaction

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Title: Heterointerface Created on Au-Cluster-Loaded Unilamellar Hydroxide Electrocatalysts as a Highly Active Site for the Oxygen Evolution Reaction
Authors: Kitano, Sho Browse this author →KAKEN DB
Noguchi, Tomohiro G. Browse this author
Nishihara, Masamichi Browse this author
Kamitani, Kazutaka Browse this author
Sugiyama, Takeharu Browse this author
Yoshioka, Satoru Browse this author
Miwa, Tetsuya Browse this author
Yoshizawa, Kazunari Browse this author
Staykov, Aleksandar Browse this author
Yamauchi, Miho Browse this author
Keywords: Au clusters
layered double hydroxides
oxygen evolution reaction
Issue Date: 21-Apr-2022
Publisher: Wiley-Blackwell
Journal Title: Advanced Materials
Volume: 34
Issue: 16
Start Page: 2110552
Publisher DOI: 10.1002/adma.202110552
Abstract: The oxygen evolution reaction (OER) is a critical element for all sorts of reactions that use water as a hydrogen source, such as hydrogen evolution and electrochemical CO2 reduction, and novel design principles that provide highly active sites on OER electrocatalysts push the limits of their practical applications. Herein, Au-cluster loading on unilamellar exfoliated layered double hydroxide (ULDH) electrocatalysts for the OER is demonstrated to fabricate a heterointerface between Au clusters and ULDHs as an active site, which is accompanied by the oxidation state modulation of the active site and interfacial direct O-O coupling ("interfacial DOOC"). The Au-cluster-loaded ULDHs exhibit excellent activities for the OER with an overpotential of 189 mV at 10 mA cm(-2). X-ray absorption fine structure measurements reveal that charge transfer from the Au clusters to ULDHs modifies the oxidation states of trivalent metal ions, which can be active sites on the ULDHs. The present study, supported by highly sensitive spectroscopy combining reflection absorption infrared spectroscopy and modulation-excitation spectroscopy and density functional theory calculations, indicates that active sites at the interface between the Au clusters and ULDHs promote a novel OER mechanism through interfacial DOOC, thereby achieving outstanding catalytic performance.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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