期刊
SCIENCE CHINA-MATERIALS
卷 58, 期 7, 页码 534-542出版社
SCIENCE PRESS
DOI: 10.1007/s40843-015-0064-z
关键词
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资金
- National Basic Research Program of China [2011CBA00503, 2011CB932403]
- Program for Changjiang Scholars and Innovative Research Team in the University [IRT1205]
- Fundamental Research Funds for the Central Universities [YS1406]
Graphene oxide (GO) is an important derivative of graphene, fascinating the entire world with its dazzling properties and versatile performance. However, the synthesis of GO via chemical routes often results in limited control of the density of functionalities and their distribution, presenting a barrier to the spread of GO applications. We modified Hummers' method and aimed at controlling the oxygen functionality of GO. The highest oxygen content of the modified synthetic GO (MdGO) occurs at edge regions, and the large proportion of carboxyl groups can be easily removed upon annealing. The excellent conductivity of intrinsic graphene can thus be recovered after the removal of the main functional groups. The resulting MdGO was reduced and doped with NH3, and the reduced MdGO (rMdGO) was determined to be an excellent support for oxygen reduction reaction (ORR) electrocatalysts. As a demonstration, a composite of CoO and N-rMdGO was fabricated, which exhibited highly comparable ORR performance in alkaline relative to 20 wt.% Pt/C.
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