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Controllable synthesis of graphene scrolls and their performance for supercapacitors

机译：石墨烯涡旋的可控合成及其在超级电容器中的性能

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A graphene scroll (GSC) is a new type of graphene-derivative material, that has widely attracted attention. However, the controllable preparation of GSCs is a major factor influencing their development and application. In this work, sodium citrate (SC) was added to a graphene oxide (GO) aqueous suspension and GSCs were controllably prepared on a large-scale by a cold quenching method. The results show that the number of scroll layers and the curling degree of the GSCs could be controlled by the quantity of SC added. The diameter of the GSCs increased when SC was added. Compared to the GSC without SC (265 nm), the average diameter of GSC(SC-40) (obtained by adding 40?mg SC to 100 mL GO solution (1 mg mL ~(?1) )) is 491 nm. When excessive SC was added, such as 100 mg, the average diameter reached 679 nm. Moreover, these GSCs were used as a supercapacitor electrode material and the electrochemical performance was tested. The specific capacitance of GSC(SC-40) (178 F g ~(?1) ) is higher than that of the GSC without SC (107 F g ~(?1) ) at the same current density of 1.0 A g ~(?1) . However, when a larger quantity of SC was added, the specific capacitance of the GSCs decreased. So, the number of scroll layers and the curling degree of the GSCs have a significant effect on the electrochemical properties of the supercapacitor.
机译：石墨烯涡旋体（GSC）是一种新型的石墨烯衍生物材料，引起了广泛的关注。但是，GSCs的可控制备是影响其开发和应用的主要因素。在这项工作中，将柠檬酸钠（SC）添加到氧化石墨烯（GO）的水悬浮液中，并通过冷淬火法可控制地大规模制备GSC。结果表明，GSC的滚动层数和卷曲度可以通过添加SC的数量来控制。当添加SC时，GSC的直径增加。与没有SC的GSC（265 nm）相比，GSC（SC-40）的平均直径（通过在100 mL GO溶液（1 mg mL〜（？1））中加入40？mg SC获得）为491 nm。当添加过量的SC例如100mg时，平均直径达到679nm。此外，这些GSC被用作超级电容器电极材料，并测试了电化学性能。在相同电流密度1.0 A g〜（）下，GSC（SC-40）的比电容（178 F g〜（？1））比没有SC的GSC（107 F g〜（？1））高。 ？1）。然而，当添加大量的SC时，GSC的比电容降低。因此，GSC的涡旋层数和卷曲度对超级电容器的电化学性能有重要影响。

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