超级电容器用石墨烯纳米片的制备及性能

通过在低温、常压条件下热剥离氧化石墨(GO)前驱体制备了石墨烯纳米片,然后用其制成了超级电容器。利用XRD、FT-IR、SEM和TEM对所制石墨烯纳米片的物相组成和形貌进行了分析,另外,采用循环伏安、恒流充放电和交流阻抗谱技术对所制超级电容器的超级电容性能进行了研究。结果表明:GO在200℃、常压下即可被有效热剥离;所制超级电容器在6 mol/L KOH体系中的最大比电容约为276 F/g。

Preparation and properties of graphene nanosheets for supercapacitors

Graphene nanosheets were prepared by thermally exfoliating the graphite oxide (GO) precursor at low temperature in normal atmosphere, and then supercapacitor was fabricated from the prepared graphene nanosheets. The phase composition and morphology of the graphene nanosheets were studied with XRD, FT-IR, SEM and TEM, while the supercapacitive properties of the supercapacitor were investigated by using cyclic voltammetry (CV), galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS) techniques. The results indicate that GO can be effectively exfoliated at 200 ℃ in normal atmosphere. The maximum specific capacitance of the supercapacitor is about 276 F/g in 6 mol/L KOH aqueous electrolyte.