GO/NiMoO_(4)纳米复合材料的制备以及电化学性能

Preparation and Electrochemical Properties of GO/NiMoO_(4) Nanocomposites

通过水热法制备了NiMoO_(4)纳米棒前驱体,再通过煅烧的方式制备出超长NiMoO_(4)纳米棒(10μm)。采用超声法将NiMoO_(4)纳米棒均匀附着在氧化石墨烯表面,制备GO/NiMoO_(4)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)及透射电子显微镜(TEM)研究材料的表面形貌和元素组成。在3 mol/L的KOH电解液中,采用三电极体系对GO/NiMoO_(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。实验结果表明,根据恒电流充放电曲线计算出的比容量,GO/NiMoO_(4)电极在1 A/g时显示出高达721 F/g的高比容量,远高于原始NiMoO_(4)电极405 F/g的比容量;根据循环伏安曲线计算的比容量,与原始的NiMoO_(4)电极相比,GO/NiMoO_(4)电极表现出显著增强的比电容,比电容可高达1 334 F/g、1 171 F/g、896 F/g、750 F/g、646 F/g和567 F/g(5 mV/s、10 mV/s、20 mV/s、30 mV/s、40 mV/s和50 mV/s下),在电流密度为20 A/g时,循环10 000次,GO/NiMoO_(4)的容量保持率达到87.3%,远远高于NiMoO_(4)的66.9%。通过这种简单的方法制备GO/NiMoO_(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很有前途的方向,卓越的性能对其未来实际应用有一定的帮助作用。

The NiMoO_(4) nanorod precursors were prepared by hydrothermal method,and then the ultra-long NiMoO_(4) nano‐rods(10μm)were prepared by calcination,and the NiMoO_(4) nanorods were uniformly attached to the graphene oxide sur‐face by ultrasonic method to prepare GO/NiMoO_(4) composites.The surface morphology and elemental composition of the ma‐terials were studied by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The electro‐chemical properties of the GO/NiMoO_(4) nanocomposites were analyzed by cyclic voltammetry,constant current charge/dis‐charge,impedance and cyclic charge/discharge tests in a 3 mol/L KOH electrolyte system.The experimental results show that the specific capacity calculated from the constant current charge/discharge curves,the GO/NiMoO_(4) electrode shows a high specific capacity of 721 F/g at 1 A/g,which is much higher than that of the original NiMoO_(4) electrode of 405 F/g,the specific capacity calculated from the cyclic voltammetry curves,compared with the original NiMoO_(4) electrode,the GO/Ni‐MoO_(4) electrode shows a significantly enhanced.The specific capacitance can be as high as 1334 F/g,1171 F/g,896 F/g,750 F/g,646 F/g and 567 F/g(at 5 mV/s,10 mV/s,20 mV/s,30 mV/s,40 mV/s and 50 mV/s),and the capacity reten‐tion rate of GO/NiMoO_(4) reaches 87.3%at a current density of 20 A/g for 10000 cycles,which is much higher than that of NiMoO_(4) at 66.9%.The capacity retention of GO/NiMoO_(4) was 87.3%which was much higher than that of NiMoO_(4)(66.9%).The preparation of GO/NiMoO_(4) nanocomposites by this simple method provides a promising direction for the selection of fu‐ture high-performance supercapacitor electrode materials,and the excellent performance makes it useful for future practi‐cal applications.