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 language | English |
---|---|
Pages (from-to) | 92-97 |
Number of pages | 6 |
Journal | Materials Research Bulletin |
Volume | 56 |
Early online date | 19 Apr 2014 |
DOIs | |
Publication status | Published - Aug 2014 |
Keywords
- Electrochemical measurements
- Energy storage
- Sol-gel chemistry
Profiles
-
Oscar Hui
- School of Engineering - Reader in Energy Storage & Conversion
- Emerging Technologies for Electric Vehicles (EV) - Member
- Energy Materials Laboratory - Member
- ClimateUEA - Member
Person: Member, Research Group Member, Academic, Teaching & Research