Bimetallic nickel-molybdenum/tungsten nanoalloys for high-efficiency hydrogen oxidation catalysis in alkaline electrolytes

Yu Duan, Zi-You Yu, Li Yang, Li-Rong Zheng, Chu-Tian Zhang, Xiao-Tu Yang, Fei-Yue Gao, Xiao-Long Zhang, Xingxing Yu, Ren Liu, Hong-He Ding, Chao Gu, Xu-Sheng Zheng, Lei Shi, Jun Jiang, Jun-Fa Zhu, Min-Rui Gao () and Shu-Hong Yu ()
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Yu Duan: University of Science and Technology of China
Zi-You Yu: University of Science and Technology of China
Li Yang: University of Science and Technology of China
Li-Rong Zheng: Chinese Academy of Sciences
Chu-Tian Zhang: University of Science and Technology of China
Xiao-Tu Yang: University of Science and Technology of China
Fei-Yue Gao: University of Science and Technology of China
Xiao-Long Zhang: University of Science and Technology of China
Xingxing Yu: University of Science and Technology of China
Ren Liu: University of Science and Technology of China
Hong-He Ding: University of Science and Technology of China
Chao Gu: University of Science and Technology of China
Xu-Sheng Zheng: University of Science and Technology of China
Lei Shi: University of Science and Technology of China
Jun Jiang: University of Science and Technology of China
Jun-Fa Zhu: University of Science and Technology of China
Min-Rui Gao: University of Science and Technology of China
Shu-Hong Yu: University of Science and Technology of China

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Hydroxide exchange membrane fuel cells offer possibility of adopting platinum-group-metal-free catalysts to negotiate sluggish oxygen reduction reaction. Unfortunately, the ultrafast hydrogen oxidation reaction (HOR) on platinum decreases at least two orders of magnitude by switching the electrolytes from acid to base, causing high platinum-group-metal loadings. Here we show that a nickel-molybdenum nanoalloy with tetragonal MoNi4 phase can catalyze the HOR efficiently in alkaline electrolytes. The catalyst exhibits a high apparent exchange current density of 3.41 milliamperes per square centimeter and operates very stable, which is 1.4 times higher than that of state-of-the-art Pt/C catalyst. With this catalyst, we further demonstrate the capability to tolerate carbon monoxide poisoning. Marked HOR activity was also observed on similarly designed WNi4 catalyst. We attribute this remarkable HOR reactivity to an alloy effect that enables optimum adsorption of hydrogen on nickel and hydroxyl on molybdenum (tungsten), which synergistically promotes the Volmer reaction.

Date: 2020
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DOI: 10.1038/s41467-020-18585-4

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