An Electrochemical Route to Quantitative Oxidation of Graphene Frameworks with Controllable C/O Ratios and Added Pseudocapacitances |
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Authors: | Fei Liu Prof. Dongfeng Xue |
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Affiliation: | State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022 (P. R. China) |
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Abstract: | We report an electrochemical oxidation route to tunable C/O ratios in the graphene framework, creating enhanced pseudocapacitance with increasing oxygen content. Controlled surface functionalities on graphene enable a high specific capacitance and negligible electric conductivity loss. A specific capacitance of up to 279 F g?1 was achieved for the functionalized graphene at a discharge current of 1 A g?1 in 1 M H2SO4 electrolyte; this capacitance remained as high as 152 F g?1 at 100 A g?1. These values are much higher than those of non‐oxidized graphene. These excellent performances of the functionalized graphene signify the importance of precise control of the surface chemistry of graphene‐based materials. |
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Keywords: | electrochemistry graphene quantitative oxidation surface functionalities tunable C/O ratios |
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