Structure and defect dual-engineering of cobalt oxides for lowtemperature Zn-air batteries  

作　　者：Hang Lei Zhuowen Huangfu Liangjun Chen Xuelin Yang Zilong Wang Wenjie Mai 

机构地区：[1]Hubei Provincial Collaborative Innovation Center for New Energy Microgrid,College of Electrical Engineering&New Energy,China Three Gorges University,Yichang 443002,China [2]Siyuan Laboratory,Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials,Department of Physics,Jinan University,Guangzhou 510632,China

出　　处：《Nano Research》2024年第5期4108-4117,共10页纳米研究（英文版）

基　　金：supported by the Natural Science Foundation of Guangdong Province(Nos.2021A1515010504,2022A1515010049);the National Natural Science Foundation of China(Nos.21706090,52172202,51872124);the Major Technological Innovation Project of Hubei Science and Technology Department(No.2019AAA164);the Natural Science Foundation of Guangzhou(No.201904010049).

摘　　要：The exploration of bifunctional electrocatalysts with high catalytic activity and long-term durability for low-temperature Zn-air batteries(ZABs)is an ongoing challenge.Here,quintet-shelled hollow spheres,P-doped multi-layer Co_(3)O_(4)(PM-Co_(3)O_(4)),with enriched oxygen vacancies are prepared by thermally induced mass relocation and a simple phosphating process.Various advanced characterizations reveal P anion-induced effects on internal electronic structure and local coordination environment.The finite element method elucidates that the complex multi-layer spherical nanostructure is conducive to the transport and diffusion of OH-and O_(2).Benefiting from its unique structural features and abundant oxygen vacancies,the well-designed PM-Co_(3)O_(4) presents small reversible oxygen overpotential for catalyzing oxygen reduction/evolution reactions.Accordingly,the fabricated low-temperature ZABs based on PM-Co_(3)O_(4) as air-cathode exhibit high power density(20.8 mW·cm^(-2))and long-term stability(over 600 cycles)at the ultra-low temperature of-40℃,outperforming state-of-art Pt/C+IrO_(2)-based ZABs.Furthermore,the dynamic evolution mechanism of cobalt oxide catalysts during ZAB operation is elucidated.This work provides a guideline to design efficient electrocatalysts with regulated electronic configurations and exquisite nano-/microstructures for ZABs under extreme working conditions.

关 键 词：Zn-air batteries ELECTROCATALYSTS low temperature hollow spheres oxygen vacancies 

分 类 号：O64[理学—物理化学]