Designed synthesis of nickel–cobalt-based electrode materials for high-performance solid-state hybrid supercapacitors. Issue 3 (7th January 2020)

• Record Type: Journal Article
• Authors: Yang, Liu; Lu, Xintong; Wang, Shihao; Wang, Jiansen; Guan, Xiaohui; Guan, Xin; Wang, Guangsheng
• Is Part Of: Nanoscale. Volume 12:Issue 3(2020)
• Page Start: 1921
• Page End: 1938
• Publication Date: 2020-01-07
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c9nr08156a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Schematic descriptions for the formation of CoNi2 S4, NiCo-LDH, and NiO/Co3 O4 and the excellent electrochemical performance of CoNi2 S4 . Abstract : Supercapacitors with high security, excellent energy and power densities, and superior long-term cycling performance are becoming increasingly essential for flexible devices. Herein, this study has reported a novel method to synthesize CoNi2 S4, which delivered a high specific capacitance of 1836.6 F g −1 at 1 A g −1, with a slight fluctuation in the testing temperature rising up to 50 °C (1855.2 F g −1 ) or decreasing to 0 °C (1587.6 F g −1 ). In addition, the corresponding solid-state CoNi2 S4 //AC HSC could achieve a high energy density of 35.8 W h kg −1 at a power density of 800.0 W kg −1, with nearly no change when tested at 0 °C and 50 °C, and possessed excellent long-term electrochemical cycling stability of 132.3% after 50 000 cycles; the solid-state hybrid supercapacitor using biomass-derived carbon (BC) as the negative electrode (CoNi2 S4 //BC HSC) could also deliver a high energy density of 38.9 W h kg −1 at a power density of 850.0 W kg −1 and the specific capacitance retention was 101.2% after cycling for 50 000 times. This work has provided a promising method to prepare high-performance electrode materials for solid-state hybrid supercapacitors with superior cycling stability and energy density.