石墨烯/氧化镍复合材料的微波法制备及电化学性能研究

Preparation of MWGO/NiO composite by microwave and its electrochemical property

采用微波法快速制备了石墨烯/氧化镍(MWGO/NiO)复合材料,利用扫描电子显微镜、X射线衍射仪和傅里叶变换红外光谱仪对其结构和形貌进行了表征。通过循环伏安法和恒电流充放电测试了MWGO/NiO复合材料的电化学性能,考察了微波功率、微波时间、投料比对复合材料性能的影响。结果表明:氧化石墨烯与硝酸镍质量比为5∶4、微波功率为1000W、微波时间为2min时,制备的复合材料电化学性能最好;在充放电电流密度为1A/g及KOH电解液浓度为6mol/L时,复合材料的最大比电容为360.5F/g。

The graphene/nickel oxide composites were prepared by microwave method.The structure and morphology of MWGO/NiO were characterized by scanning electron microscopy(SEM)and X-ray diffraction(XRD),fourier transform infrared spectroscopy(FT-IR).The electrochemical properties of MWGO/NiO were measured by cyclic voltammetry and constant current charge-discharge.The effects of microwave power,microwave reaction time and feed ratio on the properties of the composites were investigated.The results shown that the electrochemical performance was the best when the mass ratio of GO to Ni(NO3)2·6H2O was 5∶4,microwave power was 1000W and microwave time was 2min.The maximum specific capacitance was 360.5F/g when the current density of charge and discharge was1A/g and 6mol/L KOH electrolyte.