δ-MnO_(2)/Ti_(2)CT_(x)复合材料的制备与电化学性能研究

The Preparation and Electrochemical Properties of δ-MnO_(2)/Ti_(2)CT_(x) Composite Materials

以Ti_(2)AlC为前驱体、LiF-HCl的水溶液为刻蚀液、KMnO_(4)为氧化剂和锰源,采用溶液-沉积法制备了δ-MnO_(2)/Ti_(2)CT_(x)复合电极材料.分别采用X-射线衍射仪、扫描电子显微镜、拉曼光谱等方法对试样进行了表征;以镍网为对电极、银/氯化银为参比电极、2 mol·L^(-1) KOH溶液为电解质溶液,在3电极体系中采用循环伏安、恒流充放电和交流阻抗等电化学方法研究了复合材料的电化学性质.结果表明:当δ-MnO_(2)/Ti_(2)CT_(x)复合电极材料在电流密度为1 A·g^(-1)时,复合材料的比电容高达227 F·g^(-1).δ-MnO_(2)/Ti_(2)CT_(x)是一种性能良好的电化学电极材料,具有潜在的应用前景.

Theδ-MnO_(2)/Ti_(2)CT_(x)composite electrode material is prepared by solution deposition method with Ti2AlC as precursor,LiF-HCl as etching solution,KMnO_(4) as oxidant and manganese source.The physical characteristics of the samples are respectively characterized by X-ray diffractometer,scanning electron microscope and Raman spectroscopy.The electrochemical properties of the composite as work electrode are investigated by cyclic voltammetry,galvanostatic charge-discharge and electrochemical impedance spectroscopy in the three electrode system with nickel mesh as the counter electrode,Ag/AgCl as the reference electrode and 2 mol·L^(-1) KOH solution as the electrolyte solution.The results show thatδ-MnO_(2)/Ti_(2)CT_(x)composite electrode material presents a high specific capacitance of 227 F·g^(-1) at the current density of 1 A·g^(-1).Presumably,δ-MnO_(2)/Ti_(2)CT_(x)composite is to be a prospective candidate as a electrode material for high-performance supercapacitors.