Hydrothermal self-assembly and supercapacitive behaviors of Co(II) ion-modified graphene aerogels in H2SO4 electrolyte
- Title
- Hydrothermal self-assembly and supercapacitive behaviors of Co(II) ion-modified graphene aerogels in H2SO4 electrolyte
- Author
- Kwan-San Hui
- Keywords
- Sol-gel chemistry; Electrochemical measurements; Energy storage
- Issue Date
- 2014-08
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Citation
- MATERIALS RESEARCH BULLETIN, 2014, 56, p.92-97
- 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 Fg(-1) at 1 Ag-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. (C) 2014 Elsevier Ltd. All rights reserved.
- URI
- https://www.sciencedirect.com/science/article/pii/S0025540814002086?via%3Dihubhttp://hdl.handle.net/20.500.11754/47544
- ISSN
- 0025-5408; 1873-4227
- DOI
- 10.1016/j.materresbull.2014.04.026
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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