Interior and Exterior Decoration of Transition Metal Oxide Through Cu^(0)/Cu^(+) Co-Doping Strategy for High-Performance Supercapacitor

查看全文 作　　者：Weifeng [1]Liu;Zhi [1]Zhang;Yanan [1]Zhang;Yifan [1]Zheng;Nishuang [1]Liu;Jun [1]Su;Yihua [1,2]Gao

机构地区：[1]Center for Nanoscale Characterization and Devices(CNCD),School of Physics and Wuhan National Laboratory for Optoelectronics(WNLO),Huazhong University of Science and Technology(HUST),Luoyu Road 1037,Wuhan 430074,People’s Republic of China;[2]College of Materials Science and Engineering,Guangxi Key Laboratory of Optical and Electronic Materials and Devices,Guilin University of Technology,Guilin 541004,People’s Republic of China

出　　处：《Nano-Micro Letters》索引2021年第13卷第4期,共14页

基　　金：financially supported by the National Science Foundation of China(Grant No.11804106)。 摘　　要：Although CoO is a promising electrode material for supercapacitors due to its high theoretical capacitance,the practical applications still suffering from inferior electrochemical activity owing to its low electrical conductivity,poor structural stability and inefficient nanostructure.Herein,we report a novel Cu0/Cu+co-doped CoO composite with adjustable metallic Cu0 and ion Cu+via a facile strategy.Through interior(Cu+)and exterior(Cu0)decoration of CoO,the electrochemical performance of CoO electrode has been significantly improved due to both the beneficial flower-like nanostructure and the synergetic effect of Cu0/Cu+co-doping,which results in a significantly enhanced specific capacitance(695 F g^(-1) at 1 A g^(-1))and high cyclic stability(93.4%retention over 10,000 cycles)than pristine CoO.Furthermore,this co-doping strategy is also applicable to other transition metal oxide(NiO)with enhanced electrochemical performance.In addition,an asymmetric hybrid supercapacitor was assembled using the Cu0/Cu+co-doped CoO electrode and active carbon,which delivers a remarkable maximal energy density(35 Wh kg^(-1)),exceptional power density(16 kW kg^(-1))and ultralong cycle life(91.5%retention over 10,000 cycles).Theoretical calculations further verify that the co-doping of Cu^(0)/Cu^(+)can tune the electronic structure of CoO and improve the conductivity and electron transport.This study demonstrates a facile and favorable strategy to enhance the electrochemical performance of transition metal oxide electrode materials. 关键词：Cu^(0)/Cu^(+)co-doping HETEROSTRUCTURE Transition metal oxide SUPERCAPACITOR

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Interior and Exterior Decoration of Transition Metal Oxide Through Cu^(0)/Cu^(+) Co-Doping Strategy for High-Performance Supercapacitor

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