MnO2复合材料作为超级电容器电极的性能研究

摘要

通过液相共沉淀法制备得到了掺杂石墨烯/镍的二氧化锰(MnO2)复合材料,采用扫描电子显微镜法(SEM)、X射线衍射光谱法(XRD)对所得复合材料的表面形貌及微观结构进行分析,并通过循环伏安、恒流充放电及交流阻抗等方法对复合材料的电化学性能进行分析.研究结果表明,经过镍掺杂后的MnO2为粒径约为60 nm的α-MnO2,所得复合材料的电化学性能较好,在电解液浓度为2 mol/L的KOH中-0.2～0.6 V、0.5 A/g条件下,其比电容高达321 F/g,经过循环伏安测试表明,该材料具有较好的电化学可逆性.%MnO2 composites doped with graphene/nickel was prepared by liquid co-deposition method.The surface morphology and microstructure of the composites were analyzed by SEM and XRD methods.The electrochemical properties of the composites were analyzed by cyclic voltammetry,constant current charge/discharge and AC impedance.The results show that MnO2 doped with nickel is α-MnO2 with particle size of about 60 nm and the electrochemical performance of the composite is better.The specific capacitance of the material is up to 321 F/g under the condition of-0.2-0.6 V and 0.5 A/g in 2 mol/L KOH.The cyclic voltammetry test shows that the material has better electrochemical reversibility,