Polypyrrole-Modified Ni₃S₂ Nanosheet Electrodes for Supercapacitors

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.

Rational Design of NiCo2S4 Nanosheet Arrays Modified by Nitrogen-Doped Graphene Quantum Dots with Enhanced Charge Storage Performance for Flexible Supercapacitors

“…20 Ding et al modified Ni 3 S 2 using polypyrrole to improve the hydrophilicity and conductivity of the material, achieving a high energy density of 74.9 Wh kg −1 . 21 However, the practical specific capacitance value of NiCo 2 S 4 is much lower than the theoretical value, particularly for the low multiplicity performance, which is mostly owing to its weak electrical conductivity. 22,23 Based on this, we attempted to explore the introduction of carbon materials into the NiCo 2 S 4 array to improve its conductivity and extend the electron transport channel.…”

“…For example, Phonsuksawang et al designed a novel method for the doping of NiCo 2 S 4 with Fe elements, obtaining a 130% increase in energy density relative to the undoped Fe sample . Ding et al modified Ni 3 S 2 using polypyrrole to improve the hydrophilicity and conductivity of the material, achieving a high energy density of 74.9 Wh kg –1 …”