Janus effect of FeCo dual atom catalyst with Co as active center in acidic oxygen reduction reaction

Long-Ji Yuan, Zhen-Yu Miao, Xu-Lei Sui (), Chi-Feng Lee, Qi Li, Mei-Jie Yin, Li-Xiao Shen, Ying-Rui Lu, Zi-Gang Zhao, Yu-Zhe Liu, Lin-Sheng Zhu, Wei Gong, Wen-Liang Feng, Hsiao-Tsu Wang (), Guo-Xu Zhang () and Zhen-Bo Wang ()
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Long-Ji Yuan: Shenzhen University
Zhen-Yu Miao: Harbin Institute of Technology
Xu-Lei Sui: Shenzhen University
Chi-Feng Lee: Tamkang University
Qi Li: Shenzhen University
Mei-Jie Yin: Shenzhen University
Li-Xiao Shen: Shenzhen University
Ying-Rui Lu: Hsinchu Science Park
Zi-Gang Zhao: Harbin Institute of Technology
Yu-Zhe Liu: Shenzhen University
Lin-Sheng Zhu: Shenzhen University
Wei Gong: Shenzhen University
Wen-Liang Feng: Shenzhen University
Hsiao-Tsu Wang: Tamkang University
Guo-Xu Zhang: Harbin Institute of Technology
Zhen-Bo Wang: Shenzhen University

Nature Communications, 2025, vol. 16, issue 1, 1-14

Abstract: Abstract Dual-atom catalysts (DACs) represent a frontier in heterogeneous electrocatalysis for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells. However, the dynamic evolution of active-site structure complicates mechanistic understanding. Herein, alloyed Fe-Co DACs with strong Fe-Co bonds are synthesized via molecular chelation and ionic coupling strategies. In-situ spectroscopy combined with theoretical calculation reveals the Janus effect of Fe-Co dual-atom sites: Co serves as the primary catalytic center for the 4e- process with Fe as the cooperative sites to absorb the *OH. This division-of-labor mechanism lowers the theoretical overpotential from 1.14 V to 0.43 V for acidic oxygen reduction reaction. Thus, the catalyst achieves a 0.852 V half-wave potential and 1.14 W cm−2 power density (2.0 bar H₂-O₂), sustaining 81% peak power after 10,000 cycles. These findings clarify DAC configuration-mechanism relationships, guiding the design of high-performance DACs.

Date: 2025
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DOI: 10.1038/s41467-025-62728-4

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