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Vol. 13 (2021)

Interior and Exterior Decoration of Transition Metal Oxide Through Cu0/Cu+ Co-Doping Strategy for High-Performance Supercapacitor

https://doi.org/10.1007/s40820-021-00590-x
Weifeng Liu
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
Zhi Zhang
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
Yanan Zhang
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
Yifan Zheng
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
Nishuang Liu
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
Jun Su
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
Yihua Gao
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

Corresponding Author: Yihua Gao

gaoyihua@hust.edu.cn

Nano-Micro Letters, Vol. 13 (2021), Article Number: 61

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 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 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.


Highlights:


1 A facile strategy is proposed to construct novel CoO and NiO electrode material with interior (Cu+) and exterior (metallic Cu0) decoration for supercapacitor.
2 The co-doped CoO electrode presents four times higher specific capacitance and more cycle stability than that of pristine CoO.
3 The conductivity and electron transport rate of CoO with Cu0/Cu+ co-doping have been effectively improved and confirmed by detailed theoretical calculations.

Keywords

Cu0/Cu co-doping Heterostructure Transition metal oxide Supercapacitor
Liu, Weifeng, Zhi Zhang, Yanan Zhang, Yifan Zheng, Nishuang Liu, Jun Su, and Yihua Gao. 2021. “Interior and Exterior Decoration of Transition Metal Oxide Through Cu0/Cu+ Co-Doping Strategy for High-Performance Supercapacitor”. Nano-Micro Letters 13 (January):61. https://doi.org/10.1007/s40820-021-00590-x.
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