文献类型：期刊文献

英文题名：Cobalt nanoparticles embedded in N-doped carbon as an efficient bifunctional electrocatalyst for oxygen reduction and evolution reactions

作者：Su, Yunhe[1];Zhu, Yihua[1];Jiang, Hongliang[1];Shen, Jianhua[1];Yang, Xiaoling[1];Zou, Wenjian[1];Chen, Jianding[1];Li, Chunzhong[1]

机构：[1]E China Univ Sci & Technol, Key Lab Ultrafine Mat, Minist Educ, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：6

期号：24

起止页码：15080

外文期刊名：NANOSCALE

收录：;EI(收录号：20144800258062);WOS:【SCI-EXPANDED(收录号:WOS:000345458200061)】；

基金：This work was supported by the National Natural Science Foundation of China (21471056, 21236003, 21206042, and 21176083), the Basic Research Program of Shanghai (13NM1400700 and 13NM1400701), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Doping (additives) - Electrolytic reduction - Charge transfer - Electrodes - Cobalt - Electrolysis - Regenerative fuel cells - Carbon - Nanoparticles - Carbonization - Electrocatalysts - Oxygen

摘要：Cobalt based catalysts are promising bifunctional electrocatalysts for both oxygen reduction and oxygen evolution reactions (ORR and OER) in unitized regenerative fuel cells (URFCs) operating with alkaline electrolytes. Here we report a hybrid composite of cobalt nanoparticles embedded in nitrogen-doped carbon (Co/N-C) via a solvothermal carbonization strategy. With the synergistic effect arising from the N-doped carbon and cobalt nanoparticles in the composite, the Co/N-C hybrid catalyst exhibits highly efficient bifunctional catalytic activity and excellent stability toward both ORR and OER. The Delta E (oxygen electrode activity parameter for judging the overall electrocatalytic activity of a bifunctional electrocatalyst) value for Co/N-C is 0.859 V, which is smaller than those of Pt/C and most of the non-precious metal catalysts in previous studies. Furthermore, the Co/N-C composite also shows better bifunctional catalytic activity than its oxidative counterparts, which could be attributed to the high specific surface area and the efficient charge transfer ability of the composite, as well as the good synergistic effect between N-doped carbon and the Co nanoparticles in the Co/N-C composite.