期刊
JOURNAL OF ENERGY CHEMISTRY
卷 58, 期 -, 页码 629-635出版社
ELSEVIER
DOI: 10.1016/j.jechem.2020.10.036
关键词
Fe-N-C catalyst; Fe-N-4; Proton exchange membrane fuel cells; Oxygen reduction reaction; Single-atom catalyst
资金
- National Natural Science Foundation of China [51722103, 52071231, 51571149]
- Natural Science Foundation of Tianjin City [19JCJQJC61900]
The 3D metal-organic frameworks-derived Fe-N-C single-atom catalyst reported in this study enhances the site density of active Fe-N-4 moiety and facilitates mass transport, leading to excellent performance in the oxygen reduction reaction in proton exchange membrane fuel cells.
Atomically dispersed iron-nitrogen-carbon (Fe-N-C) catalysts have emerged as the most promising alternative to the expensive Pt-based catalysts for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs), however suffer from low site density of active Fe-N-4 moiety and limited mass transport during the catalytic reaction. To address these challenges, we report a three-dimensional (3D) metal-organic frameworks (MOF)-derived Fe-N-C single-atom catalyst. In this well-designed Fe-N-C catalyst, the micro-scale interconnected skeleton, the nano-scale ordered pores and the atomic-scale abundant carbon edge defects inside the skeleton significantly enhance the site density of active Fe-N-4 moiety, thus improving the Fe utilization in the final catalyst. Moreover, the combination of the above mentioned micro- and nano-scale structures greatly facilitates the mass transport in the 3D Fe-N-C catalyst. Therefore, the multiscale engineered Fe-N-C single-atom catalyst achieves excellent ORR performance under acidic condition and affords a significantly enhanced current density and power density in PEMFC. Our findings may open new opportunities for the rational design of Fe-N-C catalysts through multiscale structural engineering. (C) 2020 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
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