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An electrochemical route to quantitative oxidation of graphene frameworks with controllable C/O ratios and added pseudocapacitances

机译:具有可控制的C / O比和添加的伪电容的石墨烯骨架定量氧化的电化学途径

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摘要

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 H_2SO_4 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.
机译:我们报告了石墨烯框架中可调节的C / O比的电化学氧化途径,随着氧含量的增加,产生了增强的伪电容。石墨烯上受控的表面功能可实现高比电容和可忽略的电导率损失。在1 M H_2SO_4电解质中,在1 A g-1的放电电流下,功能化石墨烯的比电容达到279 F g〜(-1)。该电容在100 A g〜(-1)时保持高达152 F g〜(-1)。这些值远高于非氧化石墨烯的值。官能化石墨烯的这些优异性能表明了精确控制石墨烯基材料表面化学性质的重要性。

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