F-Doped Co-N-C Catalysts for Enhancing the Oxygen Reduction Reaction in Zn-Air Batteries

被引:6
|
作者
Xu, Chao [1 ]
Guo, Peng-Peng [1 ]
Yang, Kun-Zu [1 ]
Lu, Chen [1 ]
Wei, Ping-Jie [1 ]
Liu, Jin-Gang [1 ]
机构
[1] East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China
基金
中国国家自然科学基金;
关键词
electrocatalyst; F-doping; metal macrocycles; oxygen reduction reaction; Zn-air battery; POROUS CARBON; EFFICIENT; ELECTROCATALYSTS;
D O I
10.1002/cctc.202300404
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
Zn-air battery is a promising next-generation energy storage device. Its performance, however, is limited by a high overpotential resulted from the slow kinetics of the cathodic oxygen reduction reaction (ORR). This study reports a simple strategy for preparation of a fluorine-doped Co-N-C composite as highly efficient electrocatalyst for ORR. The C@PVI-(TPFC)Co-800 catalyst was prepared by pyrolysis of F-containing Co-corrole that was assembled on PVI-functionalized carbon black through the axial imidazole coordination (PVI=polyvinylimidazole, TPFC=5,10,15-triperfluorophenyl-21H, 22H-corrole). The C@PVI-(TPFC)Co-800 catalyst exhibited much more positive ORR half-wave potential (E-1/2=0.88 V vs. RHE) than its counterpart C@PVI-(TPC)Co-800 (E-1/2=0.82 V, TPC=5,10,15-triphenyl-21H, 22H-corrole) without F-doping in 0.1 M KOH electrolyte. C@PVI-(TPFC)Co-800 also achieved a greater kinetic current density and enhanced durability in alkaline media. In addition, a Zn-air battery with C@PVI-(TPFC)Co-800 loaded at the cathode delivered much higher peak power density (P-max=141 mW/cm(2)) and open-circuit voltage (OCV=1.45 V) over the C@PVI-(TPC)Co-800 counterpart (P-max=110 mW/cm(2), OCV=1.39 V) and the commercial 20 % Pt/C (P-max=119 mW/cm(2), OCV=1.42 V) as well. The promoted catalyst performance for ORR was attributed to the increased specific surface area, more defects generated, and reduced electron density distribution around the Co metal center after F-doping.
引用
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页数:6
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