Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6466197 | Chemical Engineering Journal | 2017 | 10 Pages |
â¢Petal-like NiCo2S4/Polyaniline (PANI) nanosheets electrode was fabricated.â¢The integration of PANI enhances ion-accessibility and efficient charge transportation.â¢The open space between interconnected nanosheets serve as “ion-buffering reservoirs”.â¢A flexible all-solid-state asymmetric supercapacitor achieves high energy density and power density.
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 gâ1 at a current density of 1 A gâ1 and an excellent rate capability of 72% at 20 A gâ1, after 2000 cycles, only 8.9% loss of initial capacitance at a high charge/discharge current density of 8 A gâ1. 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 kgâ1 at 0.79 kW kgâ1, outstanding power density of 27.1 kW kgâ1 at 15.9 Wh kgâ1, 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.
Graphical abstractA flexible all-solid-state asymmetric supercapacitor was successfully assembled using petal-like NiCo2S4/Polyaniline (PANI) nanosheets as the positive electrode, which exhibited an excellent electrochemical performance owing to the integration of Polyaniline into NiCo2S4 nanosheets.Download high-res image (103KB)Download full-size image