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

journal contribution
posted on 2018-01-01, 00:00 authored by Degang JiangDegang Jiang, H Liang, Y Liu, Y Zheng, C Li, Wenrong YangWenrong Yang, Colin BarrowColin Barrow, J Liu
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 CoS1.097nanoparticles (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-1at a current density of 1 A g-1and 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/GFGF asymmetric electrochemical capacitor (a-EC) device was produced with a high energy density of 33.2 W h kg-1at 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 10000 cycles within the potential window of 0-1.5 V. Notably, we confirmed that the CoS1.097/GFGF 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.

History

Journal

Journal of materials chemistry A

Volume

6

Issue

25

Pagination

11966 - 11977

Publisher

Royal Society of Chemistry

Location

Cambridge, Eng.

ISSN

2050-7488

eISSN

2050-7496

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2018, The Royal Society of Chemistry