文献类型：期刊文献

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

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

年份：2023

卷号：15

期号：11

外文期刊名：CHEMCATCHEM

收录：;EI(收录号：20232114116743);WOS:【SCI-EXPANDED(收录号:WOS:000988856700001)】；

基金：Acknowledgments This study was financially supported by the National Natural Science Foundation of China (No. 21571062), the Program for Professor of Special Appointment (Eastern Scholar) at the Shanghai Institutions of Higher Learning, and the Fundamental Research Funds for the Central Universities (No. 222201717003).

语种：英文

外文关键词：electrocatalyst; F-doping; metal macrocycles; oxygen reduction reaction; Zn-air battery

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.