【摘要】 以V2O5为原料,采用直接水合的简单方法合成了V2O5·n H2O纳米带.利用XRD和IR测试样品的结构和组成,利用SEM测试其形貌.通过循环伏安和恒流充放电法测试了V2O5·n H2O在1mol·L-1KNO3、Na NO3和Li NO3电解液中的电容性能.电化学测试结果表明,V2O5·n H2O在KNO3电解液中电容性能最好.当电压窗口为(-0.4-0.8)V、电流密度为200m A·g-1时,V2O5·n H2O电极在第600次充放电循环时展现出最大的比电容148.1F·g-1;再循环1400次后的比电容为142.6F·g-1,比电容保持率为96.3%.当电流密度从200 m A·g-1增大到800m A·g-1时,其比电容值为115.6 F·g-1,1000次循环后比电容保持率为97.9%,表明材料在大电流密度下的充放电性能较好.因此,直接水合制备的V2O5·n H2O纳米带适合做超级电容器的电极材料.更多还原

【Abstract】 V2O5·n H2 O nanobelts were synthesized by easy hydration method without any additives or templates with commercial V2O5 powders as raw material. The structure and morphology of as-prepared sample were analyzed by XRD,IR and SEM. The capacitive properties of V2O5·n H2 O nanobelts were determined by cyclic voltammetry and galvanostatic charge-discharge test in 1mol·L- 1KNO3,Na NO3 and Li NO3 neutral electrolyte solutions. The results revealed that V2O5·n H2 O nanobelts showed the best capacitive properties in KNO3 solution. In the potential range of(- 0. 4- 0. 8) V,V2O5·n H2 O electrode delivered the highest specific capacitance of 148. 1F·g- 1at 600 th cycle in KNO3 solution at a current density of 200 m A·g- 1. After 1400 cycles,the capacitance retention was 99. 3%. Furthermore,the V2O5·n H2 O electrode still exhibited specific capacitance of 115. 6 F·g- 1and excellent cycle stability at high current density of 800 m A·g- 1. These results indicate that V2O5·n H2 O nanobelts are desirable for electrode material of supercapacitor in KNO3 electrolyte solution.更多还原