Co3O4纳米簇阵列的制备及其电容特性

采用水热法以不同的填装度分别在泡沫镍和碳纤维基底上制备出了不同形貌的Co_3O_4。运用X射线衍射、红外光谱和扫描电镜对产物的结构和形貌进行表征。结果表明,在水热反应体系中,通过改变装填度大小,可以制备出相同物相、不同形貌的产物。通过循环伏安法、恒流充放电和交流阻抗法对泡沫镍基底Co_3O_4电极材料的电化学特性进行表征。结果表明,在填装度为70%时制备出的Co_3O_4均匀纳米簇阵列,表现出更好的电容特性。在2 mol/L的KOH电解液中,1 A/g的电流密度下,其比电容为961 F/g;当电流密度增至20 A/g时,比电容保持率为76%。

Preparation and Capacitance Performance of Co3O4 Nanocluster Arrays

Co3O4 grown on nickel foam and carbon fiber substrate with different morphologies were synthesized by hydrothermal synthesis method using different filling volume. The structure and morphology of the products were characterized by X-ray diffraction (XRD),Fourier Transform Infrared Spectroscopy (FTIR)and scanning electron microscopy(SEM). The results showed that by changing the filling volume can prepared the cobalt oxide products with thesame phase and different morphologies in the hydrothermal reaction system.Electrochemical properties of Co3O4grown on nickel foam electrode were characterized by cyclic voltammetry (CV), chronopotentiometry, and electrochemical impedance measurements method.The results indicated that the70%filling volumereaction system prepared uniform Co3O4nanocluster arrays,which exhibited noticeable pseudocapacitive performance with a high capacitance of 961F?g-1 at 1A?g-1in 2mol ? L-1KOH electrolyte, and 76% was maintained when the current density increased to 20A?g-1.