首页|A pore-confined strategy for synthesizing CoFe nanoparticles in mesoporous biocarbon matrix as advanced bifunctional oxygen electrocatalyst for zinc-air battery

A pore-confined strategy for synthesizing CoFe nanoparticles in mesoporous biocarbon matrix as advanced bifunctional oxygen electrocatalyst for zinc-air battery

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Designing rational transition-metal/carbon composites with highly dispersed and firmly anchored nanoparticles(NPs)to prevent agglomeration and shedding is crucial for realizing excellent electrocatalytic perfor-mances.Herein,a biomass pore-confined strategy based on mesoporous willow catkin is explored to obtain uniformly dispersed CoFe NPs in N-doped carbon nanotubes and hollow carbon fibers(CoFe@N-CNTs/HCFs).The resul-tant catalyst exhibits enhanced electrocatalytic perfor-mance,which affords a half-wave potential of 0.86 V(vs.RHE)with a limited current density of 6.0 mA-cm-2 for oxygen reduction reaction and potential of 1.67 V(vs.RHE)at 10 mA·cm-2 in 0.1 M KOH for oxygen evolution reaction.When applied to rechargeable zinc-air batteries,a maximum power density of 340 mW·cm-2 and long-term cyclic durability over 800 h are achieved.Such superior bifunctional electrocatalytic activities are ascribed to the biocarbon matrix with abundant mesopores and unob-structed hollow channels,CoFe NPs with high dispersion and controllable nanoscale and the hybrid composite with optimized electronic structure.This work presents an effective approach for constraining the size and dispersion of NPs in a low-cost biocarbon substrate,offering valuable insights for designing advanced oxygen electrocatalysts.

CoFe nanoparticlesBiocarbonPore-confined strategyBifunctional oxygen electrocatalystZinc-air battery

Xiang-Jun Zheng、Hong-Yu Gong、Na Zhang、Wen-Hua Shi、Qing Sun、Yu-Hang Qian、Li-Kun Jiang、Xue-Cheng Cao、Rui-Zhi Yang、Chang-Zhou Yuan

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School of Environmental and Chemical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China

Advanced Materials Institute,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250014,China

Automotive Engineering Research Institute,Jiangsu University,Zhenjiang 212013,China

College of Energy,Soochow Institute for Energy and Materials InnovationS,Soochow University,Suzhou 215006,China

School of Materials Science and Engineering,University of Jinan,Jinan 250014,China

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2024

10.1007/s12598-024-02969-2

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(11)