Constructing CO-immune water dissociation sites around Pt to achieve stable operation in high CO concentration environment

Daojun Long, Yongduo Liu, Xinyu Ping, Fadong Chen, Xiongxin Tao, Zhenyang Xie, Minjian Wang, Meng Wang, Li Li, Lin Guo (), Siguo Chen () and Zidong Wei
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Daojun Long: Chongqing University
Yongduo Liu: Chongqing University
Xinyu Ping: Chongqing University
Fadong Chen: Chongqing University
Xiongxin Tao: Chongqing University
Zhenyang Xie: Chongqing University
Minjian Wang: Chongqing University
Meng Wang: Chongqing University
Li Li: Chongqing University
Lin Guo: Research Institute of Petroleum Processing Co., Ltd., SINOPEC
Siguo Chen: Chongqing University
Zidong Wei: Chongqing University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract The serious problem of carbon monoxide (CO) poisoning on the surface of Pt-based catalysts has long constrained the commercialization of proton exchange membrane fuel cells (PEMFCs). Regeneration of Pt sites by maintaining CO scavenging ability through precise construction of the surface and interface structure of the catalyst is the key to obtaining high-performance CO-resistant catalysts. Here, we used molybdenum carbide (MoCx) as the support for Pt and introduced Ru single atoms (SA-Ru) at the Pt-MoCx interface to jointly decrease the CO adsorption strength on Pt. More importantly, the MoCx and SA-Ru are immune to CO poisoning, which continuously assists in the oxidation of adsorbed CO by generating oxygen species from water dissociation. These two effects combine to confer this anode catalyst (SA-Ru@Pt/MoCx) remarkable CO tolerance and the ability to operate stably in fuel cell with high CO concentration (power output 85.5 mW cm−2@20,000 ppm CO + H2 – O2), making it possible to directly use the cheap reformed hydrogen as the fuel for PEMFCs.

Date: 2024
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DOI: 10.1038/s41467-024-51562-9

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