【摘要】 以KMnO4和MnCl2.4 H2O为前驱体,采用共沉淀法合成纳米结构MnO2电极材料。添加一定量的FeCl3.6 H2O对MnO2进行改性。通过X射线衍射(XRD)、扫描电子显微镜(SEM)等方法对MnO2的结构和形貌进行表征;利用循环伏安法、恒流充放电等测试方法研究了MnO2电极材料在1 mol/L KOH电解液中的电化学行为。结果表明,FeCl3.6 H2O的大大影响MnO2的结构和形貌。随着Fe∶Mn摩尔比的增加,MnO2从γ-MnO2晶型转变为层状结构,形貌由片状转变为直径约100 nm的球形,并且Fe改性MnO2的电化学性能明显提高。当添加FeCl3.6 H2O的量为5%(Fe与Mn的摩尔比)时,在1 A/g电流密度下,MnO2电极的比电容为236 F/g。更多还原

【Abstract】 Nanostructured manganese dioxide(MnO2) was synthesized using a simple co-precipitation method with potassium permanganate and tetrahydrate manganese chloride as precursors.Certain amount of FeCl3·6 H2O was introduced during the preparation process for modification of MnO2.The structure and morphology of MnO2 were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM),respectively.The capacitive behaviors of MnO2 were studied by cyclic voltammetry(CV) and galvanostatic charge-diacharge in 1 mol/L KOH electrolyte.The results show that the addition of FeCl3·6 H2O significantly influences the structure and morphology of MnO2.With increasing the molar ratio of Fe to Mn,MnO2 changes from g-phase into layered structure.And the morphology of MnO2 changes from flake into sphere whose diameter is about 100 nm.Significant enhancement of electrochemical performance is observed for the Fe-modified MnO2.The MnO2 which is obtained with 5%(the molar ratio of Fe to Mn) FeCl3·6 H2O show the specific capacitance of 236 F/g at a current density of 1 A /g.更多还原