Improved electrochemical performances of reduced graphene oxide based supercapacitor using redox additive electrolyte |
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| Affiliation: | 1. College of Chemistry & Chemical Engineering, Anhui Province Key Laboratory of Environment-friendly Polymer Materials, Anhui University, Hefei 230039, Anhui, PR China;2. School of Chemistry & Chemical Engineering, Anhui Key Laboratory of Controllable Chemistry Reaction & Material Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China;1. Electrochemical Process Engineering Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630 006, India;2. CSIR-Network Institutes of Solar Energy (CSIR-NISE), CSIR-Central Electrochemical Research Institute, Karaikudi 630 006, India;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, PR China;2. University of Chinese Academy of Sciences, Beijing, 100049, PR China;3. State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, PR China;4. Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA, 19104, USA;1. Key Laboratory of Applied Surface and Colloid Chemistry, Shaanxi Normal University, Ministry of Education, Xi’an, 710062, PR China; Shaanxi Key Laboratory for Advanced Energy Devices, Xi’an, 710119, PR China; School of Materials Science and Engineering, Shaanxi Normal University, Xi’an, 710119, PR China;2. Shaanxi Key Laboratory of Phytochemistry, Baoji, 721013, PR China; College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji, 721013, PR China;1. CSIR-Central Scientific Instrument Organisation (CSIR-CSIO), Chandigarh, 160030, India;2. Academy of Scientific and Innovative Research (AcSIR-CSIO), Chandigarh, 160030, India;3. Department of Physics, National Institute of Technology, Kurukshetra, Haryana, India |
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| Abstract: | Reduced graphene oxide (rGO) is prepared by simple and eco-friendly hydrothermal reduction method. X-ray photoelectron spectroscopy and Ultraviolet–visible analysis corroborated the reduction of graphene oxide into rGO in basic medium. The flexibility of the prepared rGO is inferred from transmission electron micrographs. Further, the identification of suitable electrolyte is carried out using different anions (SO42−, Cl−, OH−) and cations (K+, Na+) for the superior performance of the rGO based supercapacitors. The electrochemical performance revealed that K+ and OH− ions are more active species in aqueous solutions. Subsequently, an effort was taken to improve the specific capacitance in the optimized 1 M KOH electrolyte by KI as redox additive at different concentrations (0.025, 0.05, 0.075 and 0.1 M). The calculated specific capacitance and energy density of rGO electrode in the optimized 1 M KOH + 0.05 M KI electrolyte is 500 F g−1 and 44 Wh kg−1, respectively. On the other hand, it exhibited the specific capacitance of 298 F g−1 at 0.83 A g−1 in non-aqueous polymer gel (PVA + KOH + KI) electrolyte. Finally, the charged aqueous device is utilized to glow the light emitting diode. |
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