Journal
ELECTROCHIMICA ACTA
Volume 69, Issue -, Pages 364-370Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.03.024
Keywords
Graphene; Glutathione; Supercapacitors; Specific capacitance
Categories
Funding
- Chinese Academy of Sciences [KJCX2-YW-W26]
- Beijing Municipal Science and Technology Commission [Z111100056011007]
- National Natural Science Foundation of China [21001103, 51025726]
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A large-scale, environment-friendly method to produce water-soluble reduced graphene oxide by using glutathione as a reducing and stabilization agent has been developed. The results of UV-visible absorption spectroscopy. X-ray photoelectron spectroscopy, atomic force microscopy, and transmission electron microscopy indicate that graphene oxide is reduced to graphene nanosheets which are single-layers and exhibit good dispersion in water. A reaction mechanism is proposed. The electrochemical properties of the graphene nanosheets as electrode materials for supercapacitors are studied by cyclic voltammetry and galvanostatic charge/discharge tests. A maximum specific capacitance of 238 F g(-1) in a 1 M H2SO4 electrolyte has been obtained. Meanwhile, the material shows excellent long-term cycle stability along with the retention of 97% for specific capacitance after 1000 cycle tests. (C) 2012 Elsevier Ltd. All rights reserved.
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