Design of Ru-Ni diatomic sites for efficient alkaline hydrogen oxidation

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.

doi:10.1126/sciadv.abm3779

Title: Design of Ru-Ni diatomic sites for efficient alkaline hydrogen oxidation

Journal Article · 01 June 2022 · Science Advances

DOI: https://doi.org/10.1126/sciadv.abm3779 · OSTI ID:1982944

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Univ. of California, Irvine, CA (United States)
McGill Univ., Montreal, QC (Canada)
Tianjin Univ. of Technology, Tianjin (China)
City Univ. of New York (CUNY), Queens, NY (United States)
Tamkang Univ., New Taipei City (Taiwan)
National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
Guangxi Univ., Nanning (China)
Beijing University of Chemical Technology (China)

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 H₂ dissociation and strengthen OH adsorption at the diatomic sites, and thus enhance the kinetics of HOR.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: SC0012704

OSTI ID:: 1982944

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 22 Vol. 8; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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