Bead-like cobalt-nitrogen co-doped carbon nanocage/carbon nanofiber composite:A high-performance oxygen reduction electrocatalyst for zinc-air batteries  

作　　者：Bo Zhang Yige Zhao Lu Li Yukun Li Jin Zhang Guosheng Shao Peng Zhang 

机构地区：[1]State Center for International Cooperation on Designer Low-carbon and Environmental Materials(CDLCEM),School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China [2]State Key Laboratory of Chemical Resource Engineering,Beijing Key Laboratory of Electrochemical Process and Technology for Materials,Beijing University of Chemical Technology,Beijing 100029,China

出　　处：《Nano Research》2023年第1期545-554,共10页纳米研究（英文版）

基　　金：The work was supported by the National Natural Science Foundation of China(Nos.52104314,51972287,U2004172,and 51502269);Natural Science Foundation of Henan Province(No.202300410368);the Special Project of Key Research Development and Promotion of Henan Province(No.222102240084);Sponsored by Program for Science&Technology Innovation Talents in Universities of Henan Province(23HASTIT001);the Foundation for University Key Teachers of Henan Province(No.2020GGJS009).

摘　　要：Proper regulation of metal-nitrogen carbon(M-N-C)materials derived from zeolitic imidazolate frameworks(ZIFs)is essential to enhance the oxygen reduction reaction(ORR)performance.However,most of the reports focus on the component regulation,and the structure regulation of ZIFs-derived M-N-C materials by a simple preparation method has been barely reported.Herein,using a one-step electrospinning method with subsequent pyrolysis,we have prepared a bead-like cobalt-nitrogen co-doped carbon nanocage/carbon nanofiber(Co-N-C/CNF)composite electrocatalyst with the porous carbon nanocages arranged one by one in the highly conductive carbon nanofibers.Profiting from the fully exposed active sites and improved conductivity,the Co-NC/CNF catalyst exhibits an excellent ORR performance even surpassing the commercial Pt/C catalyst.Density functional theory(DFT)results demonstrate that the CoNP-N1-C2 active sites on Co-N-C/CNF make the core contribution to the improvement of ORR properties.Moreover,the zinc-air battery(ZAB)based on the Co-N-C/CNF catalyst also shows outstanding discharge performance.This study provides a new strategy for the preparation and structural design for ZIFs-derived M-N-C materials as efficient ORR catalysts.

关 键 词：bead-like structure carbon nanocages electrospinning technology oxygen reduction reaction zinc−air battery 

分 类 号：O64[理学—物理化学]