静电喷雾结合光波还原技术高效制备石墨烯膜电极及其在超级电容中的应用

Light wave reduced graphene based on electrostatic spraying technique and its application in supercapacitors

采用静电喷雾结合光波还原技术制备了高性能石墨烯膜,结果表明,制备的石墨烯膜结构疏松,片层均匀有序;该石墨烯膜在电化学双层电容器中显示了良好的电化学性能:在电流密度0.2A·g^(-1)时,容量达到309.6F·g^(-1),电流密度1A·g^(-1)仍然能够放电233.6F·g^(-1);循环性能良好,经过10 000次循环(1A·g^(-1)),容量保持在94%以上,库伦效率接近100%。而且,这种液固直接转化及光波高效还原制备石墨烯膜电极的模式无须添加导电剂和粘结剂,避免了石墨烯片与片之间的堆叠,其结果将对研究开发新型的储能电极及器件具有重要价值和意义。

The high performance graphene films were prepared by the electrostatic spraying combined with the light wave reduction technique.The results showed that the graphene sheet structure was loose and uniform.This graphene film electrode in supercapacitor demonstrated superior electrochemical performance:the specific capacitance was up to 309.6 F·g-1 at 0.2 A·g-1;it still reached to 233.6 F·g-1 at 1 A·g-1;it was maintained at about 94% after 10 000 cycles and the coulombic efficiency was around 98% which showed good cycle stability.Therefore,the strategy of preparing the graphene film electrode avoids the addition of the conductive agent and the binder,and constrains the stacking between sheets of the grapheme.The result was very important for developing new energy storage electrodes and devices.