三维NiO/CoMoO_4纳米线/片复合材料的制备及其超级电容特性

Preparation of Three-Dimensional NiO/CoMoO_4 Nanowires/Nanosheets Composite Materials and Their Supercapacitor Properties

采用两步水热法和高温退火法成功制备了三维氧化镍/钼酸钴(NiO/CoMoO_4)复合电极材料。利用XRD、扫描电镜、透射电镜和电化学方法分别对其结构、表面形貌和电化学性能进行了表征和研究。结果表明,NiO/CoMoO_4呈独特的纳米线/片状结构而不同于NiO的针状形貌,其结构为活性物质提供了更大的活性位点。在电流密度为0. 3A/g时,复合物的比电容高达2253F/g,远远高于同电流密度下纯NiO电极材料的比电容,循环2000圈后,电容的保持率为92%,NiO和CoMoO_4的协同效应增强了其超级电容特性。

Three-dimensional NiO/CoMoO4 composite electrode materials were successfully prepared by two-step hydrothermal and high temperature annealing. The structure,surface morphology and electrochemical performance were characterized using X-ray diffraction,scanning electron microscopy,transmission electron microscopy and electrochemical method. The results showed that NiO/CoMoO4 composite materials owned typical nanowires/nanosheet structure,which were different from needle-like morphology of NiO. The structure provided more active sites for the active substance,compared with pure NiO. The specific capacitance of the composites could reach 2253 F/g at the current density of 0. 3 A/g,which was higher than that of pure NiO. It displayed good cycling stability with 92%capacitance retention after 2000 cycles due to the synergistic effect between NiO and CoMoO4.