期刊
SCIENTIFIC REPORTS
卷 7, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-017-05636-y
关键词
-
资金
- EPSRC [EP/N034627/1]
- Royal Society
- University of Exeter
A series of nanocomposites of cobalt embedded in N-doped nanoporous carbons, carbon nanotubes or hollow carbon onions have been synthesized by a one-step carbonization of metal-organic-framework ZIF-67. The effect of the carbonization temperature on the structural evolution of the resulting nanocomposites has been investigated in detail. Among the as-synthesized materials, the cobalt/nanoporous N-doped carbon composites have demonstrated excellent electrocatalytic activities and durability towards oxygen reduction reaction in alkaline medium. Compared to the benchmark Pt/C catalyst, the optimized Co@ C-800 (carbonized at 800 degrees C)exhibited high oxygen reduction reaction activity with an onset potential of 0.92V, and a half-wave potential of 0.82V. Moreover, the optimized Co@ C-800 also showed enhanced electrocatalytic activity towards oxygen evolution reaction from water splitting, with a low onset potential of 1.43V and a potential of 1.61V at 10mA cm(-2) current density. This work offered a simple solution to develop metal-organic-framework-derived materials for highly efficient electrochemical applications.
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