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- Title
Atomically dispersed Iridium on Mo<sub>2</sub>C as an efficient and stable alkaline hydrogen oxidation reaction catalyst.
- Authors
Fang, Jinjie; Wang, Haiyong; Dang, Qian; Wang, Hao; Wang, Xingdong; Pei, Jiajing; Xu, Zhiyuan; Chen, Chengjin; Zhu, Wei; Li, Hui; Yan, Yushan; Zhuang, Zhongbin
- 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. High-performance hydroxide exchange membrane fuel cells rely on the anode loading of platinum-group metals. Here, the authors report a highly active hydrogen oxidation electrocatalyst which contains atomically dispersed Ir on Mo2C nanoparticles supported on a carbon substrate.
- Subjects
HYDROGEN oxidation; IRIDIUM; PRECIOUS metals; HYDROGEN evolution reactions; ATOMIC hydrogen; FUEL cells; PLATINUM group
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-48672-9