Abstract:
La/V2O5 electrode materials were fabricated by the method of the electrochemical deposition.Effect of potential limit,scan rate,calcination temperature and the ratio of La in samples were studied,respectively.The micrographs,element content on the surface of electrodes were analyzed by SEM,EDS and the capacitive performance of V2O5 was measured by cyclic voltammetry.The results show that the main elements of the composite are Ti,V,O,La and V2O5 particles stack layers,La finely dispersing in the spaces between layers.Electrochemical results indicate that in the range of 0.21.0 V and at 0.1 mV/s,V2O5 which is calcined 3h at 200℃,it exhibits excellent capacitive performance in 2.0 mol/L KCl electrolyte.When the quality of La is 0.005g,the specific capacity of V2O5 electrodes is 51 % higher.Only about 10.3 % of the initial capacitance was lost after 1 000 cycles in circling life process,so it can be a candidate for the positive materials on supercapacitor electrode.