科研之友
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摘要
Herein, we synthesize a nanoporous N-doped graphenic carbon with high surface area and a higher graphenization/graphitic degree by further developing the metallothermic reduction of gaseous CO2 by adding N-2 into the gas flow. The N-doped nanoporous carbon is composed of both a highly porous graphenic and nongraphitic matrix and homogeneously dispersed ordered graphitic nanodomains, which constitute a very unique composite carbon structure. The resulting N-doped graphenic carbon exhibits much more favorable reactivity as a carbon conducting support in the O-2 cathode of Li-O-2 batteries, increasing the specific capacity of the GC electrode from 5300 to 9600 mAhg(-1). The N-doped carbon also exhibits lower overpotentials during initial cycling for the charging process as well as an enhanced cycling performance compared to the undoped carbon. These results demonstrate that N-doping has a strong correlation with the enhanced performance of O-2 cathode of Li-O-2 batteries.
- 出版日期2016-7
