journal article·2022-04Open access

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

Sho Kitano, Tomohiro G. Noguchi, Masamichi Nishihara, Kazutaka Kamitani, Takeharu Sugiyama, Satoru Yoshioka, Tetsuya Miwa, Kazunari Yoshizawa, Aleksandar Staykov, Miho Yamauchi

Advanced Materials· Volume 34· Issue 16

Abstract

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.
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Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced Photocatalysis Techniques · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Division of Applied Chemistry Faculty of Engineering Hokkaido University Kita 13, Nishi 8, Kita‐ku Sapporo Hokkaido 060‐8628 Japan

International Institute for Carbon‐Neutral Energy Research (WPI‐I ^{2}CNER) Kyushu University Motooka 744 Nishi‐ku Fukuoka 819‐0395 Japan

Next‐Generation Fuel Cell Research Center Kyushu University Motooka 744 Nishi‐ku Fukuoka 819‐0395 Japan

Research Center for Synchrotron Light Applications Kyushu University 6‐1 Kasuga‐koen Kasuga Fukuoka 816‐8580 Japan

Department of Applied Quantum Physics and Nuclear Engineering Faculty of Engineering Kyushu University Motooka 744 Nishi‐ku Fukuoka 819‐0395 Japan

Institute for Materials Chemistry and Engineering (IMCE) Kyushu University Motooka 744 Nishi‐ku Fukuoka 819‐0395 Japan

Integrated Research Consortium on Chemical Science (IRCCS) Kyushu University Motooka 744 Nishi‐ku Fukuoka 819‐0395 Japan

Research Center for Negative Emissions Technologies (K‐Nets) Kyushu University Motooka 744 Nishi‐ku Fukuoka 819‐0395 Japan

Advanced Institute for Materials Research (WPI‐AIMR) Tohoku University 2‐1‐1 Katahira, Aoba‐ku Sendai 980‐8577 Japan

Funding

National Institutes of Natural Sciences

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