双金属片
电催化剂
碳化物
氟
掺杂剂
碳化
石墨
化学
材料科学
氧气
无机化学
电子转移
碳纤维
催化作用
兴奋剂
化学工程
电化学
物理化学
电极
冶金
有机化学
复合材料
复合数
光电子学
吸附
工程类
作者
Zaoxue Yan,Jiajia Cui,Deli Jiang,Jimin Xie,Mingmei Zhang,Wei Wei,Xiuge Zhao
标识
DOI:10.1016/j.jcis.2024.01.070
摘要
Nitrogen- and fluorine-doped bimetallic carbide composites with graphite matrix (abbreviated as C19Cr7Mo24/NG and C19Cr7Mo24/FG) are synthesized through carbonization at 1300 °C. The C19Cr7Mo24/NG displays an initial half-wave potential (E1/2) of 0.873 V and suffers merely 3 mV decrease in E1/2 within 60,000 CV cycles for oxygen reduction reaction (ORR) in alkaline media. A H2/O2 fuel cell testing system using the C19Cr7Mo24/NG as cathode maintains 95.9% of the initial peak power density (1.08 W cm−2) within 60,000 cycles. The C19Cr7Mo24/FG shows higher ORR activity than the C19Cr7Mo24/NG. The positive and negative charge centers caused by the N or F dopants are the critical reasons to their high activities. While F and bimetallic carbide more favor electron transfer respectively than the N and monometallic carbide. Their excellent stabilities originate from interactions among atoms due to electron transfer and the intrinsic chemical inertness of graphite and bimetallic carbides.
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