Cobalt nanoparticle decorated N-doped carbons derived from a cobalt covalent organic framework for oxygen electrochemistry  

作　　者：Rui-Qi Zhang Ang Ma Xiang Liang Li-Min Zhao Hui Zhao Zhong-Yong Yuan 

机构地区：[1]School of Materials Science and Engineering,Liaocheng University,Liaocheng,252000,China [2]Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),School of Materials Science and Engineering,Nankai University,Tianjin,3000350,China

出　　处：《Frontiers of Chemical Science and Engineering》2021年第6期1550-1560,共11页化学科学与工程前沿（英文版）

基　　金：supported by the Natural Science Foundation of Shandong Province(Grant No.ZR2019PB013);the Training Program of Innovation and Entrepreneurship for Undergraduates(Grant No.CXCY2021161);the Natural Science Foundation of Tianjin(Grant No.19JCZDJC37700);the National Natural Science Foundation of China(Grant No.21875118).

摘　　要：The low cost and highly efficient construction of electrocatalysts has attracted significant attention owing to the use of clean and sustainable energy technologies.In this work,cobalt nanoparticle decorated N-doped carbons(Co@NC)are synthesized by the pyrolysis of a cobalt covalent organic framework under an inert atmosphere.The Co@NC demonstrates improved electrocatalytic capabilities compared to N-doped carbon without the addition of Co nanoparticles,indicating the important role of cobalt.The well-dispersed active sites(Co-Nx)and the synergistic effect between the carbon matrix and Co nanoparticles greatly enhance the electrocatalytic activity for the oxygen reduction reaction.In addition,the Co content has a significant effect on the catalytic activity.The resulting Co@NC-0.86 exhibits a superb electrocatalytic activity for the oxygen reduction reaction in an alkaline electrolyte in terms of the onset potential(0.90 V),half-wave potential(0.80 V)and the limiting current density(4.84 mA·cm^(−2)),and a high selectivity,as well as a strong methanol tolerance and superior durability,these results are comparable to those of the Pt/C catalyst.Furthermore,the superior bifunctional activity of Co@NC-0.86 was also confirmed in a home-built Zn-air battery,signifying the possibility for application in electrode materials and in current energy conversion and storage devices.

关 键 词：cobalt embedment N-doped carbons covalent organic framework oxygen reduction Zn-air battery 

分 类 号：O64[理学—物理化学]