期刊
ELECTROCHIMICA ACTA
卷 258, 期 -, 页码 182-191出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.10.102
关键词
polypyrrole nanotubes; NiCo2S4; core-shell; nanosheets; supercapacitor
资金
- National Natural Science Foundation of China [21576247, 21706242]
- Key Scientific Research Project of University in Henan [17A530005]
- Postdoctoral Research Sponsorship of Henan Province [2015015]
NiCo2S4 is a promising electrode material for electrochemical supercapacitors, but its poor electronic conductivity and weak electrochemical stability limit the fast charge/discharge rate and long-time reuse. Herein, we coat NiCo2S4 nanosheets on conductive polypyrrole nanotubes to form a hierarchical core-shell PNTs@NiCo2S4, aiming to enhance the electron transport and electrochemical stability of NiCo2S4. The characterization analyses confirm PNTs@NiCo2S4 is successfully synthesized and NiCo2S4 nanosheets are uniformly coated on PNTs. The PNTs@NiCo2S4 exhibits a low charge-transfer resistance (0.55 Omega) and a high specific capacitance (911 F/g at 1 A/g), which is higher than that of pure NiCo2S4 (470 F/g) and other NiCo2S4-based materials. Furthermore, 93.2% of the initial specific capacitance is remained after 4000 cycles at 5 A/g, indicating the excellent stability of PNTs@NiCo2S4. Besides, an all-solid-state symmetric supercapacitor built with PNTs@NiCo2S4 shows high energy density of 21.3 Wh/kg at 417 W/kg, high power density of 8.6 kW/kg at 11.3 Wh/kg, and good cycling stability (91.6% capacitance retention after 4000 cycles at 5 A/g). The remarkable performance of PNTs@NiCo2S4 is mainly attributed to the good conductivity of PNTs, novel core-shell structure, and synergetic effect of NiCo2S4 and PNTs. The results indicate that PNTs@ NiCo2S4 is potential electrode material for supercapacitors. (c) 2017 Elsevier Ltd. All rights reserved.
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