期刊
NANO MATERIALS SCIENCE
卷 1, 期 2, 页码 131-136出版社
KEAI PUBLISHING LTD
DOI: 10.1016/j.nanoms.2019.04.003
关键词
Fe/Fe3C nanoparticles; Prussian blue; Microwave; Carbon bath method; Oxygen reduction reaction
Fe-based carbon materials are widely considered promising to replace Pt/C as next-generation electrocatalysts towards oxygen reduction reaction (ORR). However, the preparation of Fe-based carbon materials is still carried out by conventional heating method (CHM). Herein, a novel microwave-assisted carbon bath method (MW-CBM) was proposed, which only took 35 min to synthesize Fe/Fe3C nanoparticles encapsulated in N-doped carbon layers derived from Prussian blue (PB). The catalyst contained large specific surface area and mesoporous structure, abundant Fe-N-x and C-N active sites, unique core-shell structure. Due to the synergistic effects of these features, the as-prepared Fe/Fe3C@NC-2 displayed outstanding ORR activity with onset potential of 0.98 V-RHE and half-wave potential of 0.87 V-RHE, which were more positive than 20 wt.% Pt/C (0.93 V-RHE and 0.82 V-RHE). Besides, Fe/Fe3C@NC-2 gave a better stability and methanol tolerance than Pt/C towards ORR in alkaline media, too.
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