有机液相法制备三维花状氧化铁及其在超级电容器中的应用

Preparation of 3D Flowerlike Iron Oxides by Organic Liquid Phase Method and Their Application in Supercapacitors

提出了一种简单的有机液相控制合成三维花状氧化铁前驱体的方法。在不改变其形貌的前提下,通过简单的煅烧过程,在不同条件下获得了三维花状Fe 3O_(4)、γ-Fe_(2)O_(3)和α-Fe_(2)O_(3)。采用循环伏安法(CV)、电化学阻抗谱(EIS)和计时电位法(计时电位法)在2.0 M KOH水溶液中测定了这些三维花状铁氧化物的电化学性能。结果表明,三种常见的铁氧化物均表现出良好的赝电容性能,具有很高的比电容。当电流密度为1 A/g时,α-Fe_(2)O_(3)的比电容最大,为463 F/g,而其他两种铁氧化物的比电容分别为391和334 F/g。结果表明,三维花状α-Fe_(2)O_(3)是一种很好的超级电容器电极材料。

A simple organic liquid phase methodfor a controlled synthesis three-dimensional(3D)flowerlike iron oxide precursor was put forward.3D flowerlike Fe 3O_(4),γ-Fe_(2)O_(3) andα-Fe_(2)O_(3) from the precursor without changing their morphologies by a simple calcination procedure at different condition were obtained.The electrochemical properties of these 3D flowerlike iron oxides were measured by cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS)and chronopotentiometry in 2.0 M KOH aqueous electrolyte.It was shown that three common iron oxides exhibited good pseudocapacitive behavior with highly specific capacitance.α-Fe_(2)O_(3) showed the maximum specific capacitance of 463 F/g at a current density of 1 A/g,while the specific capacitances of the other two iron oxides were 391 and 334 F/g,respectively.These results demonstrated that the special morphology of 3D flowerlikeα-Fe_(2)O_(3)was a good candidate as electrode material for supercapacitors.