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11. Synthesis of Hierarchical Porous Ni 1.5 Co 1.5 S 4 /g-C 3 N 4 Composite for Supercapacitor with Excellent Cycle Stability.

Author

Jin F, He X, Jiang J, Zhu W, Dai J, and Yang H

Abstract

In this work, the hierarchical porous Ni 1.5 Co 1.5 S 4 /g-C 3 N 4 composite was prepared by growing Ni 1.5 Co 1.5 S 4 nanoparticles on graphitic carbon nitride (g-C 3 N 4 ) nanosheets via a hydrothermal route. Due to the self-assembly of larger size g-C 3 N 4 nanosheets as a skeleton, the prepared nanocomposite possesses a unique hierarchical porous structure that can provide short ions diffusion and fast electron transport. As a result, the Ni 1.5 Co 1.5 S 4 /g-C 3 N 4 composite exhibits a high specific capacitance of 1827 F g -1 at a current density of 1 A g -1 , which is 1.53 times that of pure Ni 1.5 Co 1.5 S 4 (1191 F g -1 ). In particular, the Ni 1.5 Co 1.5 S 4 /g-C 3 N 4 //activated carbon (AC) asymmetric supercapacitor delivers a high energy density of 49.0 Wh kg -1 at a power density of 799.0 W kg -1 . Moreover, the assembled device shows outstanding cycle stability with 95.5% capacitance retention after 8000 cycles at a high current density of 10 A g -1 . The attractive performance indicates that the easily synthesized and low-cost Ni 1.5 Co 1.5 S 4 /g-C 3 N 4 composite would be a promising electrode material for supercapacitor application.

Published
2020
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