微型多孔材料
催化作用
聚丙烯腈
材料科学
聚偏氟乙烯
化学工程
静电纺丝
纳米纤维
甲醇
聚乙烯吡咯烷酮
碳纤维
电子转移
热处理
纳米技术
聚合物
化学
高分子化学
有机化学
复合材料
工程类
复合数
作者
Tianle Gong,Ruoyu Qi,Xundao Liu,Hong Li,Yongming Zhang
标识
DOI:10.1007/s40820-019-0240-x
摘要
Currently, the oxygen reduction reaction (ORR) mainly depends on precious metal platinum (Pt) catalysts. However, Pt-based catalysts have several shortcomings, such as high cost, scarcity, and poor long-term stability. Therefore, development of efficient metal-free electrocatalysts to replace Pt-based electrocatalysts is important. In this study, we successfully prepared nitrogen- and fluorine-codoped microporous carbon nanofibers (N, F-MCFs) via electrospinning polyacrylonitrile/polyvinylidene fluoride/polyvinylpyrrolidone (PAN/PVDF/PVP) tricomponent polymers followed by a hydrothermal process and thermal treatment, which was achieved for the first time in the literature. The results indicated that N, F-MCFs exhibit a high catalytic activity (Eonset: 0.94 V vs. RHE, E1/2: 0.81 V vs. RHE, and electron transfer number: 4.0) and considerably better stability and methanol tolerance for ORR in alkaline solutions as compared to commercial Pt/carbon (Pt/C, 20 wt%) catalysts. Furthermore, in acidic media, N, F-MCFs showed a four-electron transfer pathway for ORR. This study provides a new strategy for in situ synthesis of N, F-MCFs as highly efficient metal-free electrocatalysts for ORR in fuel cells.
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