以天然石墨为原料,采用Hummers法制备氧化石墨(GO),再在200～700℃进行热还原,制备石墨烯.采用SEM、XRD和比表面积仪测试分析样品的微观结构和比表面积;并用恒流充放电测试仪测试样品的电容性能.研究表明:所得石墨烯具有片层结构,层间距为0.3783～0.3873nm,晶粒大小为2.030～3.359nm,层数均为5～9层;随着热还原温度的升高,石墨烯的层间距、晶粒大小和层数均逐渐减小,而比表面积逐渐增大.随着温度的升高,比电容先升高后降低,循环性能一直增加,400℃热还原的石墨烯首次放电比电容为318.6F/g,经过500次循环后容量保持率为54％.
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