Jump to main content
Jump to site search

Issue 29, 2017

High-strength graphene composite films by molecular level couplings for flexible supercapacitors with high volumetric capacitance

Author affiliations

Abstract

A critical challenge in fabricating the electrodes of flexible supercapacitors is to optimize their electrochemical performance without deteriorating their mechanical properties. We report here a strategy to prepare freestanding reduced graphene oxide@polyvinyl alcohol (rGO@PVA) composite films by synchronously reducing and assembling GO sheets with PVA molecules on a metal surface. Such rGO@PVA composite films realize the controllable assembly of rGO sheets and PVA in an ordered layered structure as well as the molecular level couplings between rGO sheets and PVA molecules. As a result, the rGO@PVA composite films display extremely high strength and Young's modulus. After introducing H2SO4, the PVA/H2SO4 electrolyte layer between rGO sheets can form fast ion transport channel at the molecular level in the composite films. Therefore, the composite films deliver high volumetric capacity (206.8 F cm−3), excellent energy density (7.18 mW h cm−3) and power density (2.92 W cm−3). More importantly, the supercapacitors based on the composite films show stable electrochemical performance under different stresses and bending states, even when the supercapacitors were bent to 180°. The high flexibility and electrochemical performance of such supercapacitors will enable a broad field of energy-storage devices to be compatible with flexible and wearable electronics.

Graphical abstract: High-strength graphene composite films by molecular level couplings for flexible supercapacitors with high volumetric capacitance

Supplementary files

Article information


Submitted
06 Jun 2017
Accepted
05 Jul 2017
First published
05 Jul 2017

J. Mater. Chem. A, 2017,5, 15008-15016
Article type
Communication

High-strength graphene composite films by molecular level couplings for flexible supercapacitors with high volumetric capacitance

J. Cao, C. Chen, K. Chen, Q. Lu, Q. Wang, P. Zhou, D. Liu, L. Song, Z. Niu and J. Chen, J. Mater. Chem. A, 2017, 5, 15008 DOI: 10.1039/C7TA04920J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Social activity

Search articles by author

Spotlight

Advertisements