Colloidal synthesis of flower-like Zn doped Ni(OH)2@CNTs at room-temperature for hybrid supercapacitor with high rate capability and energy density

Ren, Xiaohe, Gan, Ziwei, Sun, Mengxuan, Fang, Qisheng, Yan, Yijun, Sun, Yongxiu, Huang, Jianan, Cao, Baobao, Shen, Wenzhong, Li, Zhijie and Fu, Yong Qing (2022) Colloidal synthesis of flower-like Zn doped Ni(OH)2@CNTs at room-temperature for hybrid supercapacitor with high rate capability and energy density. Electrochimica Acta, 414. ISSN 0013-4686

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Official URL: https://doi.org/10.1016/j.electacta.2022.140208

Abstract

Transition metal oxides and hydroxides are typically applied as electrode materials for supercapacitors, but it is often difficult to achieve both their high power density and energy density simultaneously. Herein, electrodes of flower-like Zn doped Ni(OH)2 combined with carbon nanotubes (i.e., Zn doped Ni(OH)2@CNTs) were in-situ synthesized using a colloidal synthesis method at room-temperature, assisted by cetyltrimethyl ammonium bromide (CTAB) and NaBH4. This electrode exhibits an excellent electrochemical performance, achieving a high specific capacity of 750.5 C g-1 at 0.5 A g-1 and maintaining 72.9% of its initial value when the current density is increased from 1 A g-1 to 10 A g-1. A hybrid supercapacitor (HSC) assembled using the Zn doped Ni(OH)2@CNTs as the positive electrode and an active carbon as the negative electrode exhibits a capacity of 201.7 C g−1 at 1 A g-1 and an energy density of 51.3 Wh kg-1 at a power density of 409.6 W kg-1. After running for 50,000 cycles at a current density of 6 A g-1, the capacity of the HSC becomes 115.8% of its initial value. Moreover, this HSC maintains a high energy density of 29.33 Wh kg-1 at a high power density of 16.5 kW kg-1 after cycling for 50,000 times, which indicates its suitability for energy storage applications.

Item Type: Article
Additional Information: Funding information: The authors would like to acknowledge International Exchange Grant (IEC/NSFC/201078) through Royal Society and National Science Foundation of China (NSFC).
Subjects: H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 11 Mar 2022 14:50
Last Modified: 23 Mar 2022 08:45
URI: http://nrl.northumbria.ac.uk/id/eprint/48663

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