材料科学
聚苯胺
催化作用
电催化剂
三聚氰胺
化学工程
碳纤维
氧还原反应
氧还原
氧气
氮气
兴奋剂
无机化学
电化学
化学
电极
物理化学
有机化学
复合材料
聚合物
聚合
光电子学
工程类
复合数
作者
Azhar Mahmood,Nanhong Xie,Bolin Zhao,Lijie Zhong,Yuwei Zhang,Li Niu
标识
DOI:10.1002/admi.202100197
摘要
The insufficient active site density and poor stability of iron and nitrogen co-doped carbon (Fe-N-C) catalyst remain as great challenges for advanced oxygen reduction reaction (ORR). Surface N-doping together with Fe species is considered as an efficient strategy to enhance the catalytic activity and stability of Fe-N-C. Here, we report a facile preparation of high performing Fe-N-C catalysts derived from Fe/melamine-decorated polyaniline. The optimal catalyst displays much better ORR onset and half-wave potentials (1.00 and 0.86 V) than that of the melamine-free catalyst (0.97 and 0.83 V) and even the commercial Pt/C (0.99 and 0.83 V), respectively. It also shows a decent stability during 20 000 cycles of accelerated durability test (ADT) with only 15 mV loss in the half-wave potential. Physical and electrochemical characterizations demonstrate that introduction of melamine could increase the percentage of surface pyrrolic N species and non-crystalline Fe species, which would be responsible for the significant improvement in the catalytic performance toward ORR.
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