期刊
ACS CATALYSIS
卷 4, 期 11, 页码 3928-3936出版社
AMER CHEMICAL SOC
DOI: 10.1021/cs500673k
关键词
non-precious metal catalyst (NPMC); oxygen reduction eaction (ORR); proton-exchange membrane fuel ell (PEMFC); cabron-supported Fe-dopedg-C3N4 (Fe-g C3N4@C); pryrolysis; Fe-N-C composite
资金
- National Natural Science Foundation of China [21473063, 21103055, 21321062]
Aimed at developing a highly active and stable non-precious metal catalyst (NPMC) for oxygen reduction reaction (ORR) in acidic proton-exchange membrane fuel cells (PEMFCs), a novel NPMC was prepared by pyrolyzing a composite of carbon-supported Fe-doped graphitic carbon nitride (Feg-C3N4@C) above 700 degrees C. In this paper, the influence of the pyrolysis temperature and Fe content on ORR performance was investigated. Rotating disk electrode (RDE) and rotating ring-disk electrode (RRDE) studies reveal that, with a half-wave potential of 0.75 V [versus reversible hydrogen electrode (RHE)] and a H2O2 yield of 2.6% at 0.4 V, the as-synthesized catalyst heat-treated at 750 degrees C with a Fe salt/dicyandiamide (DCD) mass ratio of 10% displays the optimal ORR activity and selectivity. Furthermore, the pyrolyzed FeNC composite exhibits superior durability in comparison to that of commercial 20 wt % Pt/C in acidic medium, making it a good candidate for an ORR electrocatalyst in PEMFCs.
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