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(MnO_2)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MnO_2为粒径约为60 nm的α-MnO_2,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。
MnO_2 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 MnO_2 doped with nickel is α-MnO_2 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.
出处
《电源技术》
CAS
CSCD
北大核心
2018年第1期84-86,共3页
Chinese Journal of Power Sources
基金
吉林省科技厅项目(20150420021FG)
关键词
二氧化锰
复合材料
超级电容器
电化学性能
MnO2
composite materials
supercapacitor
electrochemical performance
