期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 1, 页码 551-560出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b02841
关键词
Fuel cells; Electrocatalyst; ORR; Fe/N/C catalyst; Ammonia presynthesis activation; Nanoporous
资金
- Natural Science Foundations of China [21101154, 21171163, 91127020]
- NSF for Distinguished Young Scholars of Fujian Province [2013J06006]
- Science and Technology Planning Project of Fujian Province [2014H2008]
- strategic Priority Research Program of the Chinese Academy of Sciences [XDA09010402]
The utilization of metal and nitrogen doped carbon as a Pt-free oxygen reduction electrocatalyst depends largely on the homogeneous composition of the metal nitrogen sites with limited content. Herein a simple and feasible ammonia defective activation strategy is explored on ordered mesoporous carbon (APC) to confine hematin precursor and suppress the formation of inorganic Fe-based derivatives during pyrolysis. Thus, a hierarchically nanoporous Fe/N/APC catalyst with high numbers of exposed iron nitrogen sites exhibits an impressive performance for oxygen reduction reaction in alkaline media, with large diffusion-limited current density and positive half-wave potential with respect to commercial Pt/C catalyst. The enhanced ORR properties can be majorly ascribed to synergistic contributions of high numbers of exposed catalytic sites completion from high contents of Fe-N and pyridinic N along with the fast mass-transport properties arising from the etched high permeable porous structure. When applied as cathodic catalyst in Zn-air battery, it demonstrates a power density of 200 mW cm(-2) and a specific capacity of 605 mA h g(Zn)(-1) higher than those of Pt/C catalyst.
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