Jump to main content
Jump to site search

Issue 9, 2015
Previous Article Next Article

Freestanding 3D graphene/cobalt sulfide composites for supercapacitors and hydrogen evolution reaction

Author affiliations

Abstract

The development of lightweight, flexible, electrochemically active materials with high efficiency is important for energy storage and conversion. In this study, we report the fabrication of a freestanding, 3-dimensional graphene/cobalt sulfide nanoflake (3DG/CoSx) composite for supercapacitors and hydrogen evolution catalysts. The graphene framework formed by chemical vapour deposition provides superlight, highly conductive electron transport pathways, as well as abundant pores for electrolyte penetration. The densely patterned cobalt sulfide nanoflake arrays grown by electrodeposition offer a large surface area for electrochemical reactions, high theoretical capacitance and efficient hydrogen evolution catalytic activity. As a proof-of-concept, supercapacitors made of the 3DG/CoSx composites deliver a high specific capacitance of 443 F g−1 at 1 A g−1, with excellent capacity retention of 86% after 5000 cycles and mechanical flexibility. In addition, the 3DS/CoSx composites show attractive features as hydrogen evolution catalysts, with a low overpotential of 0.11 V and a Tafel slope of 93 mV dec−1.

Graphical abstract: Freestanding 3D graphene/cobalt sulfide composites for supercapacitors and hydrogen evolution reaction

Back to tab navigation

Supplementary files

Article information


Submitted
06 Dec 2014
Accepted
16 Dec 2014
First published
17 Dec 2014

RSC Adv., 2015,5, 6886-6891
Article type
Paper
Author version available

Freestanding 3D graphene/cobalt sulfide composites for supercapacitors and hydrogen evolution reaction

Y. Wang, J. Tang, B. Kong, D. Jia, Y. Wang, T. An, L. Zhang and G. Zheng, RSC Adv., 2015, 5, 6886
DOI: 10.1039/C4RA15912H

Social activity

Search articles by author

Spotlight

Advertisements