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Abstract:
The search for a low-cost metal-free cathode material with excellent mass transfer structure and catalytic activity in oxygen reduction reaction (ORR) is one of the most challenging issues in fuel cells. In this work, nitrogen-rich m-phenylenediamine is introduced into the synthesis of porous carbon spheres to tune the pore structure and nitrogen-doped active sites. As a result, more pyridinic N and pyrrolic N functional species were observed at the interior and surface of the carbon spheres. The introduction of m-phenylenediamine also regulated the nucleating of precursors, an urchin-like mesoporous surface structure ensures point contact and less agglomeration between each particle was obtained. With optimized proportion of micropores/mesopores and improved nitrogen-contained functional species, the ORR activity can be remarkably improved. The half-wave potential of this catalyst could achieve to 0.81 V (versus RHE) which is only 42 mV lower than commercial Pt/C catalyst. Furthermore, the optimized cathode catalyst achieved a 69 mW cm(-2) maximum power density when operated in direct methanol fuel cells at room temperature.
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Source :
ENERGY & ENVIRONMENTAL MATERIALS
Year: 2021
Issue: 1
Volume: 4
Page: 81-87
1 5 . 1 2 2
JCR@2020
Cited Count:
WoS CC Cited Count: 6
SCOPUS Cited Count: 13
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 1
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