纳微快报（英文）2021，Vol.13Issue(4)：96-109,14.
Interior and Exterior Decoration of Transition Metal Oxide Through Cu0/Cu+ Co-Doping Strategy for High-Performance Supercapacitor
Interior and Exterior Decoration of Transition Metal Oxide Through Cu0/Cu+ Co?Doping Strategy for High?Performance Supercapacitor
摘要
Abstract
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 ineffi-cient nanostructure. Herein, we report a novel Cu0/Cu+ co-doped CoO composite with adjustable metallic Cu0 and ion Cu+ via a facile strat-egy. 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. Fur- thermore, 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 Cu0/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
Cu0/Cu+ co-doping/Heterostructure/Transition metal oxide/SupercapacitorKey words
Cu0/Cu+ co-doping/Heterostructure/Transition metal oxide/Supercapacitor引用本文复制引用
Weifeng Liu,Zhi Zhang,Yanan Zhang,Yifan Zheng,Nishuang Liu,Jun Su,Yihua Gao..Interior and Exterior Decoration of Transition Metal Oxide Through Cu0/Cu+ Co-Doping Strategy for High-Performance Supercapacitor[J].纳微快报（英文）,2021,13(4):96-109,14.基金项目
This study is financially supported by theNational Science Foundation of China (Grant No. 11804106). Y.H.G would like to thank Prof. Zhong Lin Wang for the facil-ity support in WNLO of HUST. The authors also thank the Analysis and Testing Center of HUST for the XRD and XPS characterizations. （Grant No. 11804106）
