Atomically dispersed chromium coordinated with hydroxyl clusters enabling efficient hydrogen oxidation on ruthenium

Bingxing Zhang, Baohua Zhang, Guoqiang Zhao, Jianmei Wang, Danqing Liu, Yaping Chen, Lixue Xia, Mingxia Gao, Yongfeng Liu, Wenping Sun () and Hongge Pan ()
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Bingxing Zhang: Zhejiang University
Baohua Zhang: Zhejiang University
Guoqiang Zhao: Zhejiang University
Jianmei Wang: Zhejiang University
Danqing Liu: Zhejiang University
Yaping Chen: Zhejiang University
Lixue Xia: International School of Materials Science and Engineering, Wuhan University of Technology
Mingxia Gao: Zhejiang University
Yongfeng Liu: Zhejiang University
Wenping Sun: Zhejiang University
Hongge Pan: Zhejiang University

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract Overcoming the sluggish kinetics of alkaline hydrogen oxidation reaction (HOR) is challenging but is of critical importance for practical anion exchange membrane fuel cells. Herein, abundant and efficient interfacial active sites are created on ruthenium (Ru) nanoparticles by anchoring atomically isolated chromium coordinated with hydroxyl clusters (Cr1(OH)x) for accelerated alkaline HOR. This catalyst system delivers 50-fold enhanced HOR activity with excellent durability and CO anti-poisoning ability via switching the active sites from Ru surface to Cr1(OH)x-Ru interface. Fundamentally different from the conventional mechanism merely focusing on surface metal sites, the isolated Cr1(OH)x could provide unique oxygen species for accelerating hydrogen or CO spillover from Ru to Cr1(OH)x. Furthermore, the original oxygen species from Cr1(OH)x are confirmed to participate in hydrogen oxidation and H2O formation. The incorporation of such atomically isolated metal hydroxide clusters in heterostructured catalysts opens up new opportunities for rationally designing advanced electrocatalysts for HOR and other complex electrochemical reactions. This work also highlights the importance of size effect of co-catalysts, which should also be paid substantial attention to in the catalysis field.

Date: 2022
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DOI: 10.1038/s41467-022-33625-x

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