An efficient Co-N/C electrocatalyst for oxygen reduction facilely prepared by tuning cobalt species content

被引:17
|
作者
Liu, Hao [1 ]
Yi, Shijie [1 ]
Wu, Yunfeng [2 ]
Wu, Han [1 ]
Zhou, Jinrong [1 ]
Liang, Wenjie [1 ]
Cai, Jianfeng [3 ]
Xu, Hai [1 ,4 ]
机构
[1] Cent South Univ, Coll Chem & Chem Engn, Key Lab Hunan Prov Chem Power Source, Changsha 410083, Hunan, Peoples R China
[2] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[3] Univ S Florida, Dept Chem, Tampa, FL 33620 USA
[4] Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China
基金
中国国家自然科学基金;
关键词
Nitrogen doped carbon material; Covalent organic polymer; Metalloporphyrin; Cobalt species; Oxygen reduction reaction; N-DOPED CARBON; CATALYSTS; NITROGEN; EVOLUTION; POLYMERS; FRAMEWORKS; NANOSHEETS;
D O I
10.1016/j.ijhydene.2020.04.024
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Transition metal and nitrogen co-doped carbon catalysts for the oxygen reduction reaction (ORR) have emerged as promising candidates to replace the expensive platinum catalysts but still remain a great challenge. Herein, a novel and efficient nitrogen-doped carbon material with metal cobalt co-dopant (Co-N/C) has been prepared by pyrolyzing porphyrin-based covalent organic polymer where Co is anchored. The optimized 10%-Co-N/C catalyst through facilely and efficiently tuning the cobalt content is carefully characterized by XRD, Raman, XPS, SEM and TEM for composition and microstructure analysis. This catalyst with only 0.56% Co exhibits an excellent ORR catalytic activity with a positive half-wave potential of 0.816 V (vs. RHE) in 0.1 M KOH solution, which is comparable to that of commercial Pt/C (20 wt%). Notably, the 10%-Co-N/C catalyst displays better electrochemical stability with only a loss of 5.1% of its initial current density in chronoamperometric measurement and also gives rise to stronger methanol tolerance than Pt/C. The good ORR catalytic behaviour for this catalyst may be attributed to the dispersion of the Co-N-x active sites via adjusting the contents of cobalt species in porous organic framework. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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页码:16105 / 16113
页数:9
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