Atomically dispersed Iridium on Mo2C as an efficient and stable alkaline hydrogen oxidation reaction catalyst

Jinjie Fang, Haiyong Wang, Qian Dang, Hao Wang, Xingdong Wang, Jiajing Pei, Zhiyuan Xu, Chengjin Chen, Wei Zhu, Hui Li (), Yushan Yan () and Zhongbin Zhuang ()
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Jinjie Fang: Beijing University of Chemical Technology
Haiyong Wang: Beijing University of Chemical Technology
Qian Dang: Beijing University of Chemical Technology
Hao Wang: Beijing University of Chemical Technology
Xingdong Wang: Beijing University of Chemical Technology
Jiajing Pei: Beijing University of Chemical Technology
Zhiyuan Xu: Beijing University of Chemical Technology
Chengjin Chen: Beijing University of Chemical Technology
Wei Zhu: Beijing University of Chemical Technology
Hui Li: Beijing University of Chemical Technology
Yushan Yan: University of Delaware
Zhongbin Zhuang: Beijing University of Chemical Technology

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Hydroxide exchange membrane fuel cells (HEMFCs) have the advantages of using cost-effective materials, but hindered by the sluggish anodic hydrogen oxidation reaction (HOR) kinetics. Here, we report an atomically dispersed Ir on Mo2C nanoparticles supported on carbon (IrSA-Mo2C/C) as highly active and stable HOR catalysts. The specific exchange current density of IrSA-Mo2C/C is 4.1 mA cm−2ECSA, which is 10 times that of Ir/C. Negligible decay is observed after 30,000-cycle accelerated stability test. Theoretical calculations suggest the high HOR activity is attributed to the unique Mo2C substrate, which makes the Ir sites with optimized H binding and also provides enhanced OH binding sites. By using a low loading (0.05 mgIr cm−2) of IrSA-Mo2C/C as anode, the fabricated HEMFC can deliver a high peak power density of 1.64 W cm−2. This work illustrates that atomically dispersed precious metal on carbides may be a promising strategy for high performance HEMFCs.

Date: 2024
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DOI: 10.1038/s41467-024-48672-9

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