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Download fileTwo-Dimensional Mesoporous Carbon Doped with Fe–N Active Sites for Efficient Oxygen Reduction
journal contribution
posted on 2017-09-25, 00:00 authored by Yifan Ye, Haobo Li, Fan Cai, Chengcheng Yan, Rui Si, Shu Miao, Yanshuo Li, Guoxiong Wang, Xinhe BaoIron–nitrogen
(Fe–N) sites confined within carbon
are highly active to catalyze the oxygen reduction reaction (ORR).
The mesoporous structure of carbon facilitates the mass transport
and availability to the Fe–N sites during the ORR; however,
the construction of mesoporous carbon architecture with highly exposed
and accessible Fe–N active sites remains challenging. Herein,
3D-to-2D transformation of zeolitic imidazolate framework-7 (ZIF-7)
was successfully achieved via convenient impregnation in ammonium
ferric citrate aqueous solution. After pyrolysis, isolated Fe–N
sites are generated and confined within highly mesoporous carbon without
using any additional modulator or template. The optimal Fe–N
catalyst exhibits excellent performance toward ORR in alkaline medium,
exceeding commercial 40% Pt/C catalyst in terms of activity, stability,
and methanol resistance.