碳纤维
氮气
吸附
纳米颗粒
热解
氧气
材料科学
电化学
催化作用
二氧化碳电化学还原
化学工程
无机化学
纳米技术
化学
电极
一氧化碳
有机化学
复合材料
工程类
复合数
物理化学
作者
Meiling Fan,Xiangchuan Pan,Weiran Lin,Haining Zhang
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2020-03-11
卷期号:3 (4): 3487-3493
被引量:23
标识
DOI:10.1021/acsanm.0c00222
摘要
Nitrogen-doped carbon materials are realized as effective electrode materials for oxygen-involved electrochemical devices. Understanding of active sites for adsorption of oxygen molecules is of significant importance for the development of carbon-based electrode materials. Herein, we synthesize two model catalysts named carbon-covered nitrogen-doped hollow carbon nanoparticles and nitrogen-doped carbon-covered hollow carbon nanoparticles by pyrolysis of block copolymer brushes to investigate the active sites for the adsorption of oxygen molecules. The electrocatalytic performance for oxygen reduction reaction (ORR) and carbon dioxide adsorption suggest that carbon atoms are Lewis basic active sites for oxygen adsorption. The coverage of a thin carbon layer on nitrogen-doped carbon materials can increase the surface density of Lewis basic sites for oxygen adsorption and can accordingly improve the electrocatalytic activity toward ORR as confirmed by a positive shift of both onset potential and half-wave potential.
科研通智能强力驱动
Strongly Powered by AbleSci AI