TY - JOUR

T1 - Designed synthesis of nickel-cobalt-based electrode materials for high-performance solid-state hybrid supercapacitors

AU - Yang, L.

AU - Lu, X.

AU - Wang, S.

AU - Wang, J.

AU - Guan, X.

AU - Wang, G.

PY - 2020/1/21

Y1 - 2020/1/21

N2 - 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 CoNi 2S 4, 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 CoNi 2S 4//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 (CoNi 2S 4//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.

AB - 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 CoNi 2S 4, 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 CoNi 2S 4//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 (CoNi 2S 4//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.

U2 - 10.1039/c9nr08156a

DO - 10.1039/c9nr08156a

M3 - Journal article

VL - 12

SP - 1921

EP - 1938

JO - Nanoscale

JF - Nanoscale

SN - 2040-3364

IS - 3

ER -