Promoting ordering degree of intermetallic fuel cell catalysts by low-melting-point metal doping

Ru-Yang Shao, Xiao-Chu Xu, Zhen-Hua Zhou, Wei-Jie Zeng, Tian-Wei Song, Peng Yin, Ang Li, Chang-Song Ma, Lei Tong, Yuan Kong () and Hai-Wei Liang ()
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Ru-Yang Shao: University of Science and Technology of China
Xiao-Chu Xu: University of Science and Technology of China
Zhen-Hua Zhou: University of Science and Technology of China
Wei-Jie Zeng: University of Science and Technology of China
Tian-Wei Song: University of Science and Technology of China
Peng Yin: University of Science and Technology of China
Ang Li: University of Science and Technology of China
Chang-Song Ma: University of Science and Technology of China
Lei Tong: University of Science and Technology of China
Yuan Kong: University of Science and Technology of China
Hai-Wei Liang: University of Science and Technology of China

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Carbon supported intermetallic compound nanoparticles with high activity and stability are promising cathodic catalysts for oxygen reduction reaction in proton-exchange-membrane fuel cells. However, the synthesis of intermetallic catalysts suffers from large diffusion barrier for atom ordering, resulting in low ordering degree and limited performance. We demonstrate a low-melting-point metal doping strategy for the synthesis of highly ordered L10-type M-doped PtCo (M = Ga, Pb, Sb, Cu) intermetallic catalysts. We find that the ordering degree of the M-doped PtCo catalysts increases with the decrease of melting point of M. Theoretic studies reveal that the low-melting-point metal doping can decrease the energy barrier for atom diffusion. The prepared highly ordered Ga-doped PtCo catalyst exhibits a large mass activity of 1.07 A mgPt−1 at 0.9 V in H2-O2 fuel cells and a rated power density of 1.05 W cm−2 in H2-air fuel cells, with a Pt loading of 0.075 mgPt cm−2.

Date: 2023
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DOI: 10.1038/s41467-023-41590-2

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