双功能
过电位
电催化剂
沸石咪唑盐骨架
聚丙烯腈
纳米纤维
材料科学
化学工程
析氧
咪唑酯
催化作用
碳纳米纤维
碳化
无机化学
化学
纳米技术
电极
复合材料
有机化学
电化学
吸附
金属有机骨架
扫描电子显微镜
物理化学
聚合物
工程类
作者
Ligang Feng,Ruifu Ding,Hao Chen,Jia‐Wei Wang,Li Xu
标识
DOI:10.1016/j.jpowsour.2020.227837
摘要
Herein ultra-small CoP nanoparticles incorporated into nitrogen-doped carbon nanofibers derived from zeolitic imidazolate framework-67 (ZIF-67) are found active as a bifunctional catalyst for oxygen electrocatalysis. The composite nanofibers of polyacrylonitrile-cobalt acetate are firstly prepared by the electrostatic spinning and then immersed into 2-methylimidazole ethanol solution for the growth of restricted ZIF-67. The hybrid is further annealed and phosphided to obtain the ultra-small CoP nanoparticles incorporated into nitrogen-doped carbon nanofibers (CoP/NC). The degree of carbonization and retention of the nanofiber topology structure are determined by the annealing temperature. Excellent bifunctional oxygen electrocatalysis performance is observed on CoP/NC and the performance improvement can be attributed to the more active site exposure, good conductivity and co-action of CoP and N-doped carbon nanofiber. An overpotential of 290 mV is required to drive 10 mA cm−2 for oxygen evolution reaction, and an onset potential of 0.90 V and half-wave potential of 0.78 V are obtained for the oxygen reduction reaction in the alkaline electrolyte. A strong application in Zn-air battery is also demonstrated compared with the device configured by Pt/C catalyst. The current work demonstrates a significant technique to boost the catalytic performance of MOF derived catalysts for energy-relevant catalytic reactions.
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