The poor stability of non-noble metal catalysts in oxygen reduction reaction(ORR)is a main bottleneck that limits their big-scale application in metal-air batteries.Herein,we construct a chainmail catalyst(Co-NC-AD)with outstanding stability,via the competitive complexation and post absorption strategy,consisting of highly graphitic layers wrapped uniform-size Co nanoparticles(Co-NPs).Experiments com-bined with density functional theory(DFT)calculations jointly confirmed that the electron transfer occurred from the inner Co-NPs to the external graphitic layers.It facilitated the adsorption process of oxygen molecules and the hybridization of the O-2p and C-1p orbitals,which accelerated the ORR reac-tion kinetics.Consequently,our prepared Co-NC-AD shows excellent ORR activity,offered with a more positive initial potential(Eonset=0.95 V)and half-wave potential(E1/2=0.86 V).The remarkable stability and resistance of methanol poisoning are merited from the protection effect of stable graphitic layers.In addition,the high electrochemical performance of Co-NC-AD-based zinc-air battery demonstrates their potential for practical applications.Therefore,our work provides new ideas for the design of nano-confined catalysts with high stability and activity.

Yu Feng;Kexin Song;Wei Zhang;Xinyan Zhou;Seung Jo Yoo;Jin-Gyu Kim;Sifan Qiao;Yugang Qi;Xu Zou;Zhongjun Chen;Tingting Qin;Nailin Yue;Zizhun Wang;Dabing Li;Weitao Zheng

State Key Laboratory of Automotive Simulation and Control,School of Materials Science&Engineering,Key Laboratory of Automobile Materials MOE,Electron Microscopy Center,and International Center of Future Science,Jilin University,Changchun 130012,Jilin,China;Division of Scientific Instrumentation&Management,Korea Basic Science Institute,Daejeon 34133,Republic of Korea;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;State Key Laboratory of Luminescence and Applications,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,Jilin,China

能源化学

[1]Yu Feng;Kexin Song;Wei Zhang;Xinyan Zhou;Seung Jo Yoo;Jin-Gyu Kim;Sifan Qiao;Yugang Qi;Xu Zou;Zhongjun Chen;Tingting Qin;Nailin Yue;Zizhun Wang;Dabing Li;Weitao Zheng-.Efficient ORR catalysts for zinc-air battery:Biomass-derived ultra-stable Co nanoparticles wrapped with graphitic layers via optimizing electron transfer)[J].能源化学,2022(07):211-218

chainmail,merited

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