期刊
CARBON ENERGY
卷 4, 期 1, 页码 1-11出版社
WILEY
DOI: 10.1002/cey2.136
关键词
fuel cell; hierarchically mesoporous carbon spheres; oxygen reduction reaction; single-atom catalysts
类别
资金
- State Key Laboratory for Mechanical Behavior of Materials [20192101]
- Scientific Research Funds of Huaqiao University [17BS405]
- National Natural Science Foundation of China [21503158, 21703184, 21905220, 51425301, 51772240, U1601214]
- Key Research and Development Plan of Shaanxi Province [2018ZDXM-GY-135]
- China Postdoctoral Science Foundation [2020M673408]
- Fundamental Research Funds for Young Talent Support Plan of Xi'an Jiaotong University [HG6J003]
- Natural Science Foundation Committee of Jiangsu Province [BK20201190]
- Promotion Program for Young and Middle- aged Teacher in Science and Technology Research of Huaqiao University [ZQN-PY506]
The article introduces a novel Fe-N-C catalyst consisting of mono-dispersed hierarchically mesoporous carbon sphere cores and single Fe atom-dispersed functional shells. A synergistic effect between highly dispersed Fe-active sites and well-organized porous structures yields a combination of high ORR activity and high mass transfer performance.
Novel cost-effective fuel cells have become more attractive due to the demands for rare and expensive platinum-group metal (PGM) catalysts for mitigating the sluggish kinetics of the oxygen reduction reaction (ORR). The high-cost PGM catalyst in fuel cells can be replaced by Earth-abundant transition-metal-based catalysts, that is, an Fe-N-C catalyst, which is considered one of the most promising alternatives. However, the performance of the Fe-N-C catalyst is hindered by the low catalytic activity and poor stability, which is caused by insufficient active sites and the lack of optimization of the triple-phase interface for mass transportation. Herein, a novel Fe-N-C catalyst consisting of mono-dispersed hierarchically mesoporous carbon sphere cores and single Fe atom-dispersed functional shells are presented. The synergistic effect between highly dispersed Fe-active sites and well-organized porous structures yields the combination of high ORR activity and high mass transfer performance. The half-wave potential of the catalyst in 0.1 M H2SO4 is 0.82 V versus reversible hydrogen electrode, and the peak power density is 812 mW center dot cm(-2) in H-2-O-2 fuel cells. Furthermore, it shows superior methanol tolerance, which is almost immune to methanol poisoning and generates up to 162 mW center dot cm(-2) power density in direct methanol fuel cells.
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