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Han, Lili; Ou, Pengfei; Liu, Wei; Wang, Xiang; Wang, Hsiao-Tsu; Zhang, Rui; Pao, Chih-Wen; Liu, Xijun; Pong, Way-Faung; Song, Jun; Zhuang, Zhongbin; Mirkin, Michael V; Luo, Jun; Xin, Huolin L
Science advances, 06/2022, Letnik: 8, Številka: 22Journal Article
Anion exchange membrane fuel cells are limited by the slow kinetics of alkaline hydrogen oxidation reaction (HOR). Here, we establish HOR catalytic activities of single-atom and diatomic sites as a function of *H and *OH binding energies to screen the optimal active sites for the HOR. As a result, the Ru-Ni diatomic one is identified as the best active center. Guided by the theoretical finding, we subsequently synthesize a catalyst with Ru-Ni diatomic sites supported on N-doped porous carbon, which exhibits excellent catalytic activity, CO tolerance, and stability for alkaline HOR and is also superior to single-site counterparts. In situ scanning electrochemical microscopy study validates the HOR activity resulting from the Ru-Ni diatomic sites. Furthermore, in situ x-ray absorption spectroscopy and computational studies unveil a synergistic interaction between Ru and Ni to promote the molecular H dissociation and strengthen OH adsorption at the diatomic sites, and thus enhance the kinetics of HOR.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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