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

Xiaohe Ren, Ziwei Gan, Mengxuan Sun, Qisheng Fang, Yijun Yan, Yongxiu Sun, Jianan Huang, Baobao Cao, Wenzhong Shen, Zhijie Li, Yongqing (Richard) Fu

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish
Article number140208
Number of pages9
JournalElectrochimica Acta
Volume414
Early online date16 Mar 2022
DOIs
Publication statusPublished - 10 May 2022

Fingerprint

Dive into the research topics of 'Colloidal synthesis of flower-like Zn doped Ni(OH)2@CNTs at room-temperature for hybrid supercapacitor with high rate capability and energy density'. Together they form a unique fingerprint.

Cite this