Hydrothermal self-assembly and supercapacitive behaviors of Co(II) ion-modified graphene aerogels in H2SO4 electrolyte

Bao, Qi, Hui, K. N., Hui, K. S. ORCID: https://orcid.org/0000-0001-7089-7587, Wang, Yi and Hong, Xiaoting (2014) Hydrothermal self-assembly and supercapacitive behaviors of Co(II) ion-modified graphene aerogels in H2SO4 electrolyte. Materials Research Bulletin, 56. pp. 92-97. ISSN 0025-5408

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Abstract

Reduced graphene oxide (r-GO) aerogels decorated with divalent cobalt ions were synthesized via a one-pot hydrothermal self-assembly route. The interaction of Co(II) ions with 3D r-GO aerogels was investigated by spectroscopic techniques, including Raman, attenuated total reflectance infrared, and X-ray photoelectron spectroscopies. The excellent electrochemical properties of the aerogels were confirmed by cyclic voltammetry, galvanostatic charge/discharge tests, and electrochemical impedance spectroscopy in an acid electrolyte (1 M H2SO4). The Co(II) ion-modified r-GO aerogels can be used as high-performance hybrid supercapacitor materials with a specific capacitance of 387.2 F g-1 at 1 A g-1 current density and a good cycling stability without capacity decay over 1000 cycles. The mechanical integrity enhancement of the hybrid r-GO aerogel framework and the improvement in its unique capacitive performance are attributed to the efficient interconnection produced by electro-active Co(II) ions.

Item Type:	Article
Uncontrolled Keywords:	electrochemical measurements,energy storage,sol-gel chemistry
Faculty \ School:	Faculty of Science > School of Engineering University of East Anglia > Theme - ClimateUEA
Related URLs:	http://www.scopus.com/inward/record.url?...
Depositing User:	Pure Connector
Date Deposited:	04 Oct 2016 12:01
Last Modified:	19 Apr 2023 17:31
URI:	https://ueaeprints.uea.ac.uk/id/eprint/60658
DOI:	10.1016/j.materresbull.2014.04.026

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