Highly packed graphene-CNT films as electrodes for aqueous supercapacitors with high volumetric performance

The increasing complexity of portable electronics demands the development of energy storage devices with higher volumetric energy and power densities. In this work we report a simple strategy for the preparation of partially reduced graphene oxide/carbon nanotube composites (prGO-CNT) as highly packed self-standing binder-free films suitable as electrodes for supercapacitors. These carbon-based films are easily obtained by the hydrothermal treatment of an aqueous suspension of graphene oxide and CNTs at 210 °C and then compacted under pressure. The prGO-CNT films, which had an apparent density as high as 1.5 g cm-3, were investigated as binder-free electrodes for aqueous supercapacitors using 6 M KOH solution as the electrolyte. The results show that the presence of merely 2 wt% of CNTs produces a significant enhancement of the capacitance retention at high current densities compared to the CNT-free samples, and this improvement is especially relevant in systems formed using electrodes with high mass loadings. Volumetric capacitance values of 250 F cm-3 at 1 A g-1 with outstanding capacitance retention (200 F cm-3 at 10 A g-1) were achieved using the prGO-CNT electrodes with an areal mass loading above 12 mg cm-2.

Bibliographic Details

Main Authors:	Díez Nogués, Noel, Botas, Cristina, Mysyk, Roman, Goikolea, Eider, Rojo, Teófilo, Carriazo, Daniel
Other Authors:	Ministerio de Economía y Competitividad (España)
Format:	artículo biblioteca
Language:	English
Published:	Royal Society of Chemistry (UK) 2018-01-01
Subjects:	Ensure access to affordable, reliable, sustainable and modern energy for all, Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation,
Online Access:	http://hdl.handle.net/10261/345242 http://dx.doi.org/10.13039/501100003329 https://api.elsevier.com/content/abstract/scopus_id/85042415691
Tags:	Add Tag No Tags, Be the first to tag this record!