期刊
MATERIALS RESEARCH BULLETIN
卷 145, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2021.111526
关键词
Fe-Pani-RGO; ORR activity; biomass RGO; noble-free; pore characteristics
资金
- Universiti Kebangsaan Malaysia [GUP-2018-013]
- Fundamental Research Grant Scheme by the Ministry of Education Malaysia [FRGS/1/2019/STG01/UKM/02/2]
The study highlights the Fe-N 4 moiety as the active site, with a higher N/C ratio contributing to higher ORR activity. Additionally, the meso-/macroporous structure is crucial for achieving higher overall performance.
Pyrolysed Fe-N-C catalysts are foreseen to be promising noble-free cathode catalysts for proton exchange membrane fuel cells. Nevertheless, efforts are required to overcome active site degradation, which is influenced by the meso/macroporous composition of the catalyst and support. Reduced graphene oxide from Sengon wood is seen as a potential support for Fe-polyaniline (Pani) catalysts due to its hierarchical porous structure that depends on N/C ratio. This work reveals that the Fe-N 4 moiety serves as the active site, which is confirmed by XPS and first-principles calculations. Fe-Pani-RGO 2:0.2, with the highest content of Fe-N-4 and specific surface area, results in the highest ORR activity with E-onset =0.84 V, E-1/2 = 0.79 V, and J(D) = 5.5 mA/cm(2). Although micropores are important for hosting the active sites that contribute to high ORR activity, in regard to single-cell performance, the role of meso-/macropores is crucial for achieving higher overall performance.
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