水热法制备氧化锰纳米材料及其电容性能

Preparation of Manganese Oxide Nanomaterial by Hydrothermal Method and Its Capacitive Performance

基于KMnO4的自分解反应,采用水热法在180℃制备了氧化锰材料。应用X-射线衍射、扫描电镜和透射电镜技术对所得材料的结构和形貌进行了表征。结果表明,所得材料为具有Birnessite结构的层状氧化锰花球,花球由纳米片组装而成。电化学测试结果显示,制备材料表现出优良的电容特性。当电流密度为0.25 A/g时,比电容为173 F/g。在10 mV/s的扫描速度下,循环测试1000圈后比电容保持率高达97%。

Manganese oxide was prepared based on self-decomposition of KMnQ via hydrothemlal treatment at 180℃. The obtained material was characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Results showed that the product obtained showed flower-like microsphere morphology with Birnessite-type layered structure and the microphere consisted of nanosheets. Electrochemical measurements indicated that the prepared material exhibited good capacitive behavior. The specific capacitance was 173 F/g when the current density was 0.25 A/g. Moreover, the material exhibited good cycle stability. The specific capacitance retention reached 97% after 1000 cycles at a sweep rate of 10 mV/s.