Issue 12, 2019

Formation of nickel–cobalt sulphide@graphene composites with enhanced electrochemical capacitive properties

Abstract

Here, nickel–cobalt sulphide particles embedded in graphene layers (porous Ni–Co–S@G), were successfully prepared by one-step annealing of metallocene/metal–organic framework (MOF) hybrids involving simultaneous carbonization and sulfidation. Benefiting from the porous structure, highly conductive graphene layers and large loading of super-capacitive Ni–Co–S, the obtained Ni–Co–S@G composites exhibited excellent electrochemical performance with a specific capacitance of 1463 F g−1 at a current density of 1 A g−1. A flexible solid-state asymmetric supercapacitor (ASC), assembled with Ni–Co–S@G and active carbon, demonstrated a high energy density of 51.0 W h kg−1 at a power density of 650.3 W kg−1. It is noteworthy that the ASC offered robust flexibility and excellent performance that was maintained when the devices were bent at various angles. The results indicate that the as-prepared materials could potentially be applied in high-performance electrochemical capacitors.

Graphical abstract: Formation of nickel–cobalt sulphide@graphene composites with enhanced electrochemical capacitive properties

Supplementary files

Article information

Article type
Paper
Submitted
18 Aug 2018
Accepted
19 Feb 2019
First published
28 Feb 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 6946-6955

Formation of nickel–cobalt sulphide@graphene composites with enhanced electrochemical capacitive properties

J. Qiu, Z. Bai, S. Liu and Y. Liu, RSC Adv., 2019, 9, 6946 DOI: 10.1039/C8RA06906A

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