Journal
CHEMICAL ENGINEERING JOURNAL
Volume 325, Issue -, Pages 134-143Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.05.043
Keywords
All-solid-state asymmetric supercapacitor; Flexible; Energy storage; NiCo2S4; Polyaniline; Petal-like
Categories
Funding
- National Natural Science Foundation of China [51402065]
- Heilongjiang Province Natural Science Funds for Distinguished Young Scholar [JC201404]
- Special Innovation Talents of Harbin Science and Technology for Distinguished Young Scholar [2014RFYXJ005]
- Fundamental Research Funds of the Central University (HEUCFZ)
- Natural Science Foundation of Heilongjiang Province [B201404, E201329]
- Program of International SAMP
- T Cooperation special project [2013DFR50060]
- Special Innovation Talents of Harbin Science and Technology [2013RFQXJ145]
- fund for Transformation of Scientific and Technological Achievements of Harbin [2013DB4BG011]
- Innovation Talents of Harbin Science and Technology [2014RFQXJ035]
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The synthesis of NiCo2S4 as electroactive material has been well reported, however, fabricating a NiCo2S4 electrode with excellent electrochemical performance at high current density remains a challenge. Herein, we developed a supercapacitor electrode comprising petal-like NiCo2S4/Polyaniline (PANI) nanosheets via a simple hydrothermal route coupled with a chemical oxidative polymerization. Benefiting from the integration of PANI, which greatly enhance ion-accessibility and lead to more efficient charge transportation, the resultant NiCo2S4/PANI electrode exhibited a high specific capacitance of 1879 F g 1 at a current density of 1 A g(-1) and an excellent rate capability of 72% at 20 A g(-1), after 2000 cycles, only 8.9% loss of initial capacitance at a high charge/discharge current density of 8 A g(-1). Moreover, a flexible all-solid-state asymmetric supercapacitor was successfully assembled using NiCo2S4/PANI as the positive electrode and activated carbon (AC) as the negative electrode, the assembled device exhibits a superior energy density of 54.06 Wh kg(-1) at 0.79 kW kg(-1), outstanding power density of 27.1 kW kg(-1) at 15.9 Wh kg(-1), which significantly transcending those of most previously reported. This study shows that the prepared NiCo2S4/PANI electrode offers great potential in energy storage device applications. (C) 2017 Elsevier B.V. All rights reserved.
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