铝掺杂二氧化锰纳米线的制备及其电化学性能

Preparation and Electrochemical Performance of Al-doped Manganese Dioxide Nanowires

采用水热法以KMnO_4和MnSO_4为原料,Al(NO_3)_3为铝源,制备出了Al掺杂的二氧化锰纳米线。通过扫描电子显微镜(SEM)和X线衍射仪(XRD)分别对样品的形貌和结构进行表征,并使用循环伏安法(CV)、恒流充放电等方法研究了样品的电化学性能。结果表明,当添加适量Al(NO_3)_3制备出直径约?10nm、长约80nm的纳米球线。当Al(NO_3)_3的摩尔比为1mmol,电流密度为2mA/cm^2时,面电容为1 127mF/cm^2,比相同条件下纯二氧化锰容量高65%,表现出良好的电化学性能。

The Al-doped manganese dioxide nanowire has been prepared with the hydrothermal method by using KMnO4 and MnSO4 as raw materials. The structure and morphology of samples are characterized through scanning electron microscope (SEM) and X-ray diffraction (XRD) respectively. Besides, the electrochemical performance of the sample is studied with the cyclic voltammetry (CV) and constant current charge and discharge methods. The results show that the nanosphere wires with a diameter of about φ10 nm and a length of 80 nm are prepared when appropriate amount of Al(NO3) 3 is added. When 1mmol of Al (NO3) 3 is added, the capacitance is 1 127 mF/cm^2 under 2 mA/cm^2 of current density, which is 65% higher than that of pure manganese dioxide under the same conditions, showing good electrochemical performance.