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

Qi Bao, K. N. Hui, K. S. Hui, Yi Wang, Xiaoting Hong

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)92-97
Number of pages6
JournalMaterials Research Bulletin
Volume56
Early online date19 Apr 2014
DOIs
Publication statusPublished - Aug 2014

Keywords

  • Electrochemical measurements
  • Energy storage
  • Sol-gel chemistry

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