热还原制备的石墨烯材料的电容性能

Capacitance behaviors of graphene material prepared via thermal reduction

用改进的Hummers法,通过热还原快速制备石墨烯电极材料.用XRD、FT-IR、SEM和比表面积测试分析样品的物相组成和微观形貌;用恒流充放电、循环伏安和电化学阻抗谱（EIS）技术研究样品的双电层电容性能.样品具有纳米片层结构,以200 mA/g和300 mA/g的电流在0.1～2.7V充放电,放电比电容分别为124.56 F/g和103.54 F/g;以5～100 mV/s的扫描速率进行循环伏安测试,石墨烯电极表现出良好的双电层电容性能.

Graphene electrode material was quickly prepared by the improved Hummers method via thermal reduction. The phase composition and microscopic morphology of the sample were studied by XRD, FT-IR, SEM and specific surface tests. The superca- pacitive behaviors of the sample were investigated by galvanostatic charge-discharge, cyclic voltammetry and electrochemical impe- dance spectroscopy（EIS） techniques. The sample had nano-sheets layered structure, when charged-discharged in 0. 1 - 2. 7 V with the current of 200 mA/g and 300 mA/g,its special discharge capacitance was 124. 56 F/g and 103.54 F/g,respeetively. The gra- phene electrode showed fine supercapacitive behaviors when cyclic vohammetry test was taken under the scan rate of 5 - 100 mV/s.