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Issue 25, 2018

In situ generation of CoS1.097 nanoparticles on S/N co-doped graphene/carbonized foam for mechanically tough and flexible all solid-state supercapacitors

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Abstract

The development of flexible electrochemical devices with high-density electrochemical capacitive energy storage and high mechanical strength remains the main obstacle for practical applications. Here, we designed and generated a S/N co-doped graphene based electrode (CoS1.097/GF electrode) with well-distributed CoS1.097 nanoparticles (NPs), which were anchored directly in/on porous carbonized melamine foam by a squeeze-dip-coating and sulfidation process. The CoS1.097/GF electrode shows desired conductivity, cycling stability and high ion-accessible surface area, leading to an ultrahigh specific capacitance of 4476 F g−1 at a current density of 1 A g−1 and a favourable rate capability of 87.1% at 10 A g−1. Furthermore, a high-strength and flexible CoS1.097/GF/KOH/PVA composite film electrode was prepared using KOH/polyvinyl alcohol (KOH/PVA) as a gel electrolyte, and a flexible CoS1.097/GF||GF asymmetric electrochemical capacitor (a-EC) device was produced with a high energy density of 33.2 W h kg−1 at a power density of 374.7 W kg−1, where the KOH/PVA gel works as a solid-state electrolyte and separator. We observed 95.6% capacitance retention after 10 000 cycles within the potential window of 0–1.5 V. Notably, we confirmed that the CoS1.097/GF||GF a-EC device performed at large bending angles (from 0° to 180°), and was able to be twisted into various shapes, indicating its potential for application in wearable and portable electronic devices.

Graphical abstract: In situ generation of CoS1.097 nanoparticles on S/N co-doped graphene/carbonized foam for mechanically tough and flexible all solid-state supercapacitors

Supplementary files

Article information


Submitted
09 May 2018
Accepted
22 May 2018
First published
22 May 2018

J. Mater. Chem. A, 2018,6, 11966-11977
Article type
Paper

In situ generation of CoS1.097 nanoparticles on S/N co-doped graphene/carbonized foam for mechanically tough and flexible all solid-state supercapacitors

D. Jiang, H. Liang, Y. Liu, Y. Zheng, C. Li, W. Yang, C. J. Barrow and J. Liu, J. Mater. Chem. A, 2018, 6, 11966 DOI: 10.1039/C8TA04307H

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