采用简单化学沉积制备纳米锰氧化物及其电化学超级电容性能(英文)

Electrochemical Supercapacitors Performance of Nanostructed Manganese Oxides Prepared by a Simple Chemical Deposition Method

通过一种简便的化学沉积的方法，合成了用于电化学超级电容器的纳米锰氧化物材料．采用扫描电镜（SEM）、透射电镜（TEM）和X-射线衍射（XRD）对材料的形貌及其结构进行了表征．通过循环伏安、恒电流充放电以及电化学交流阻抗等对材料的电化学性能进行了测试，结果为：所制备的材料在6mol·L^-1KOH的电解质体系中、在5mV·s^-1的扫描速率下具有266F·g^-1的比容量，对比文献报道值150～250F·g^-1有明显的提高．且材料具有较好的电化学稳定性和较长的循环寿命．

Nanostructured manganese oxides with ideal capacitive behavior for electrochemical capacitors were synthesized by a simple chemical deposition method. The morphology and structure of the material were characterized by scanning electron microscopy （SEM） transmission electron microscopy （TEM）, and X-ray diffraction （XRD）. Cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance tests were employed to investigate the electrochemical performance of the material. The as-prepared manganese oxides electrode exhibited a promising specific capacitance of 266 F · g^-2 in the 6 mol ·L^-1 KOH electrolyte at the scan rate of 5 mV · s^-2 compared to 150-250 F · g ^-1 prepared by the similar method reported in the literature. Moreover, the electrode showed high electrochemical stability and a long cycle life.