电解氧化法膨胀石墨形成机理研究

Studies on the Formation Mechanism of Expanded Graphite by Electrolytic Oxidation Method

采用现代测试方法对电解氧化法制备的膨胀石墨各阶段产物进行了表征 ,对其形成机理作了一些探讨。结果证实 ,在氧化过程中 ,层间表面的石墨被氧化后 ,与嵌入层间的H2 SO4、H2 O等生成层间化合物 ,该化合物瞬间受高热而分解 ,产生的推力使石墨沿C轴方向膨胀 ,而层平面碳 -碳结构未被破坏。

The expanded graphite was prepared by electrolytic oxidation.The nature graphite(NG)、oxided graphite (OG) and expanded graphite means of (EG) is characterized by scanning electron microscopy SEM.X-Ray diffraction (XRD) and transmision electron microscope (TEM).The results show that the surface graphite in interlayer is oxided first,and then sulphate_graphite intercalation compounds is formed with H 2SO 4 and H 2O intercalated in the interlayer.It expands along c_axie when heated at 1000℃ in a twinkling.The C-C structure on the layer does not destroy.