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Oxygen functional groups improve the energy storage performances of graphene electrochemical supercapacitors

机译：氧官能团可改善石墨烯电化学超级电容器的储能性能

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Graphene is a promising electrode material for supercapacitors due to its superior physical and chemical properties, but the influence of its oxygen functional groups on capacitive performance still remains somewhat uncertain. In this work, graphene sheets with different oxygen content have been prepared through thermal reduction in argon. Furthermore, oxidation and pore-forming treatment of graphene annealed at 800?°C are also performed to explore the important effect of oxygen functional groups. The effects of disorder degree, surface area and oxygen functional groups on the specific capacitance were explored systematically. The content and species of oxygen functional groups are found to be significant factors influencing the electrochemical supercapacitor performance of graphene electrodes. The specific capacitances of graphene annealed at 200, 400 and 800 °C are 201, 153 and 34 F g?1, respectively. However, the specific capacitance of graphene reduced at 800 °C can be increased to 137 F g?1 after nitric acid oxidation treatment, and is only 39 F g?1 after pore forming on graphene surface, demonstrating that the oxygen functional groups can improve the capacitive performances of graphene electrochemical supercapacitors.
机译：石墨烯由于其优异的物理和化学性能而成为超级电容器的有希望的电极材料，但是其氧官能团对电容性能的影响仍然不确定。在这项工作中，通过氩气的热还原制备了具有不同氧含量的石墨烯片。此外，还进行了在800°C退火的石墨烯的氧化和成孔处理，以探索氧官能团的重要作用。系统地研究了无序度，表面积和氧官能团对比电容的影响。发现氧官能团的含量和种类是影响石墨烯电极的电化学超级电容器性能的重要因素。在200、400和800°C退火的石墨烯的比电容分别为201、153和34 F g ？1 。然而，在硝酸氧化处理后，在800°C下还原的石墨烯的比电容可以增加到137 F g ？1 ，仅为39 F g 石墨烯表面成孔后的？1 表明，氧官能团可以改善石墨烯电化学超级电容器的电容性能。

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