水热法合成不同价态的钒氧化物及其电容性能比较  

Hydrothermal synthesis of various vanadium oxides and their capacitive properties in aqueous electrolytes

作　　者：陈联梅 张立宁[2] 康泰然 CHEN Lian-Mei;ZHANG Li-Ning;KANG Tai-Ran(Chengdu University,Chengdu 610000,China;China West Normal University,Nanchong 637000,China)

机构地区：[1]成都大学,四川成都610000 [2]西华师范大学,四川南充637000

出　　处：《化学研究与应用》2020年第12期2268-2275,共8页Chemical Research and Application

基　　金：成都大学项目(2081918019)。

摘　　要：以V2 O5为原料,葡萄糖为还原剂,利用水热法,控制不同反应温度,制备得到不同价态的钒氧化物。利用XRD、XPS、TG和SEM对产物的晶体结构、钒的价态、水分含量和形貌进行表征。结果表明,在水热温度80、100、120°C下,分别得到产物V2 O5·H2 O、V10 O24·10H2 O和VO2·0.7H2 O。利用循环伏安法和恒流充放电法研究了它们的电容性能。混合价态V10 O24·10H2 O的电容性能明显好于V2 O5·H2 O和VO2·0.7H2 O。在1 mol·L^-1 KNO3中性电解液溶液中电压窗口(-0.3-0.7)V条件下,V10 O24·10H2 O电极展现出初始比电容187.3为F·g^-1;1000次循环后的比电容保持率为92.8%。由于水热法操作简单,还原剂葡萄糖廉价易得,产物性能更好,因此水热法制备的V10 O24·10H2 O适合用于超级电容器的电极材料。Various vanadium oxides were prepared by a hydrothermal method with cheap V2 O5 and glucose.The crystal structure,the valence of V element,water content and morphology of the samples were characterized by XRD,XPS,TG and SEM,respectively.The results revealed that V2 O5·H2 O,V10 O24·10H2 O and VO2·0.7H2 O sample was respectively obtained when the hydrothermal temperature was controlled at 80,100 and 120°C.Their capacitive properties were investigated by cyclic voltammetry and galvanos-tatic charge/discharge test in 1 mol·L^-1 KNO3 electrolyte solution.Among the three samples,V10 O24·10H2 O exhibited the best capacitive behavior.The V10 O24·10H2 O electrode delivered the initial specific capacitance of 187.3 F·g^-1 at the working voltage of(-0.3-0.7)V.After 1000 cycles,the capacity retention was 92.8%.Obviously,V10 O24·10H2 O is suitable for the electrode ma-terial of supercapacitors due to easy hydrothermal method,cheap glucose reductant,good capacitive properties.

关 键 词：V2 O5 葡萄糖 水热法 V10 O24·10H2 O 电容性能 

分 类 号：O646[理学—物理化学]