NiMoO_(4)-CoMoO_(4)纳米复合材料的制备及其电化学性能

Preparation and Electrochemical Properties of NiMoO_(4)-CoMoO_(4) Nanocomposites

通过两步水热法,在泡沫镍基底上成功制备了NiMoO_(4)-CoMoO_(4)纳米复合材料。借助X射线衍射仪(XRD)研究材料的晶格结构,利用扫描电子显微镜(SEM)及其X射线能谱仪(EDS)研究材料的表面形貌和元素组成。在2 mol/L的KOH电解液中,采用三电极体系对NiMoO_(4)-CoMoO_(4)纳米复合材料进行循环伏安、恒电流充放电、交流阻抗和循环充放电测试,分析电极的电化学性能。结果表明NiMoO_(4)-CoMoO_(4)复合电极具有良好的电化学性能和循环稳定性:在1 A/g的电流密度下,材料的比电容为219.8 F/g,经过1000次循环后,比电容保持率为101.3%。所合成的NiMoO_(4)-CoMoO_(4)纳米复合材料为未来高性能超级电容器电极材料的选择提供了参考,也必将具有良好的应用前景。

NiMoO_(4)-CoMoO_(4) nanocomposites were successfully prepared on the substrate of nickel foam by a two-step hydrothermal method.The crystal structure of the material was studied by the X-ray diffractometer(XRD),and the surface morphology and element composition of the material were researched by the scanning electron microscope(SEM)and X-ray energy dispersive spectrometer(EDS).The cyclic voltammetry,galvanostatic charge-discharge,alterating current impedance and cyclic charge-discharge tests of the NiMoO_(4)-CoMoO_(4) nanocomposites were carried out in the 2 mol/L KOH electrolyte with three-electrode system,and the electrochemical properties of the electrode were analyzed.The results show that the NiMoO_(4)-CoMoO_(4) composite electrode has good electrochemical properties and cycle stability.The specific capacitance of the material is 219.8 F/g at a current density of 1 A/g,and the retention rate of the specific capacitance is 101.3% after 1000 cycles.The synthesized NiMoO4-CoMoO4 nanocomposites provide a reference for the selection of electrode materials for high performance supercapacitors and will have a good application prospect.