Rational-designed hybrid aerogels for ultra-flyweight electrochemical energy storage

Lu, Mingxia, Liu, Shanshan, Chen, Jing, Zhang, Xia, Zhang, Jingchao, Li, Zhe and Hou, Bo ORCID: https://orcid.org/0000-0001-9918-8223 2020. Rational-designed hybrid aerogels for ultra-flyweight electrochemical energy storage. Journal of Physical Chemistry C 124 (29) , pp. 15688-15697. 10.1021/acs.jpcc.0c02217

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Abstract

Hybridising 2D materials into 3D aerogels have attracted considerable interest in ultralight electrochemical energy storage devices. However, to optimise the device structure for more efficient charge storage and transport, a better understanding of the ratio-dependent hybridisation process and interface charge transfer mechanisms are highly required. Here, we perform a comprehensive study to elucidate the fundamental process during the reduced graphene oxide (rGO) and carbon nanotube (CNT) hybridisation, which enabled the fabrication of a rational-designed rGO/CNT hybrid aerogel (GCA) with a record energy storage performance beyond previously reported works. Based on spectroscopy and microscopy analysis, we found the hydrophilic and hydrophobic transition of GO which eliminates the surface-functionalised oxygen-containing moieties, is the origin of the π-π stacking hybridisation between rGO and CNTs. Moreover, we found the different amount of CNTs ‘solder’ in-between rGO sheets can offer GCA distinct mechanical elasticity, ion diffusion resistance and specific capacitance. As illustrated in the electrochemical impedance spectroscopy (EIS) and charge/discharge analysis, we found GCA 2-2 (rGO:CNT=2:2) display the best gravimetric capacitance of 117 F∙g-1 at a discharge current density of 1 A∙g-1, which help us to fabricate an ultra-flyweight supercapacitor with a large energy density of 3.53 Wh∙kg-1 at a power density of 283.4 W∙kg-1.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Chemical Society
ISSN:	1932-7447
Date of First Compliant Deposit:	13 July 2020
Date of Acceptance:	29 June 2020
Last Modified:	07 Nov 2023 03:54
URI:	https://orca.cardiff.ac.uk/id/eprint/133325

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