Polypyrrole-Modified Ni<sub>3</sub>S<sub>2</sub> Nanosheet Electrodes for Supercapacitors
Jiefei Ding, Tong Xia, Qing Xia, Guanglong Li, Yingdong Qu
Abstract
Reasonably constructed complex electrode materials are crucial for enhancing the performance of supercapacitors. In this work, polypyrrole (PPy)-modified Ni3S2 nanosheet electrodes are obtained by a hydrothermal approach and a subsequent electrodeposition method. In addition, a composite electrode can shorten the ion diffusion path and enhance its conductivity. The optimal product delivers a capacity of 1484 C g–1 at 1 A g–1 and high cycling stability. In addition, the assembled hybrid supercapacitor achieves an energy density of 74.9 W h kg–1 at 1356.4 W kg–1 and a capacity of 91.7% after 10 000 cycles. Also, the device shows excellent mechanical stability under different bending angles.