石墨烯/金属氧化物复合电极材料最佳制备条件选取研究

Optimum preparation conditions of graphene/metal oxide composite electrode materials

以金属氧化物和氧化石墨烯为原料,采用水热法,通过正交实验选取不同的金属氧化物在不同的实验条件下制备复合电极材料。通过对复合材料的恒流充放电测试和交流阻抗测试以及对电化学数据进行Origin拟合分析,以电极比电容和Nyquist图中低频直线的斜率为实验评价指标,对实验数据进行对比分析,确定石墨烯/金属氧化物复合材料的最佳制备条件为:金属氧化物MnO_(2),金属氧化物与氧化石墨烯质量比1:1,水热温度160℃,水热时间10 h。该研究为水热法制备石墨烯/金属氧化物复合电极材料提供一条参考路径。

By hydrothermal synthesis method and orthogonal experiment design,graphene/metal oxide composite electrode materials were prepared from different metal oxides and graphene oxides under different experimental conditions.Moreover,galvanostatic charge-discharge test and AC impedance test were carried out for the composite materials.Then,the obtained electrochemical data was fitted by Origin software.The specific capacitance of the electrodes and the slope of low frequency line in Nyquist diagram were selected as the experimental evaluation indexes.Through comparative analysis of the best data of the two experimental indexes,the optimum synthesized conditions of graphene composites were selected as follows.Metal oxide:MnO_(2),mass ratio of metal oxide to graphene oxide:1:1,hydrothermal temperature:160℃,hydrothermal time:10 h.This study provides a reference path for preparation of graphene/metal oxide composite electrode materials by hydrothermal method.