石墨烯/TiO_2复合材料的制备及其在超级电容器中的应用

Preparation of Graphene/TiO_2 Composite and Its Application in Supercapacitor

采用水热合成法,制备了不同比例的RGO/TiO_2复合材料,并采用X射线衍射(XRD)和透射电子显微镜(TEM)对其结构和物相进行表征。将所制备的材料组装到简易的三电极体系中,采用循环伏安(CV)、恒电流充放电(GCD)以及电化学阻抗谱(EIS)测试对所制材料的电化学储能进行测试。研究结果表明RGO/TiO_2复合材料比纯的石墨烯具有更优异的电化学性能。当电流密度为1A·g-1,4mol·L-1KOH条件下,RGO∶TiO_2=10∶1时比电容可达177·F·g-1,该结果表明水热法制备的复合材料在超级电容器材料中具有广泛的应用前景。

The RGO/TiO2 composites with different proportions were prepared by hydrothermal synthesis method, and their structures and phases were characterized by X-ray diffraction （XRD） and transmission electron microscopy （TEM）. A simple three-electrode system was prepared with the prepared material, and the cyclic voltammetry （CV）, galvanostatic charge discharge （GCD） method and electrochemical impedance spectroscopy （EIS） were used to test the electrochemical energy storage of prepared material. The results showed that the RGO/TiO2 composites had better electro- chemical properties than pure graphene. When the current density was 1A/g, under the condition of 4mol·L^-1KOH and RGO：TiO2=10：1, the capaci- tance could reach 177F·g^-1, which indicated that the composites prepared by hydrothermal synthesis method had an extensive application prospect in the fields of supercapaeitor materials.