期刊
JOURNAL OF POWER SOURCES
卷 452, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.227837
关键词
Oxygen evolution; Oxygen reduction; Bi-functional catalysis; Metal-organic framework; Cobalt phosphide
资金
- National Science Foundation of China [21972124, 21603041]
- Priority Academic Program Development of Jiangsu Higher Education Institution
- Six Talent Peaks Project of Jiangsu Province [XCL-070-2018]
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 nanoflber 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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