混合价态钒氧化物(V_(10)O_(24)·10H_2O)的合成及其电容性能研究  

Synthesis of a Mixed-valence Vanadium Oxide(V_(10)O_(24)·10H_2O) and Investigation on Its Capacitive Properties

作　　者：张立宁[1,2] 康玲[1,2] 邹慧君[1,2] 陈联梅[1,2] 

机构地区：[1]西华师范大学化学化工学院,四川南充637009 [2]西华师范大学化学合成与污染控制重点实验室,四川南充637009

出　　处：《西华师范大学学报（自然科学版）》2016年第3期279-284,共6页Journal of China West Normal University(Natural Sciences)

基　　金：西华师大科研项目(416198)

摘　　要：提出了一种新的简单水热法来合成混合价态V_(10)O_(24)·10H_2O。以廉价的V_2O_5为原料,Mn SO_4为还原剂,水热法制备得到样品。利用XRD、XPS、EDS、TG和SEM测试了样品的晶体结构、钒元素的价态、元素组成、水分含量和形貌。首次探讨了V_(10)O_(24)·10H_2O在水系电解质中的电容性能。电化学测试结果表明,V_(10)O_(24)·10H_2O电极在电压窗口为(-0.2—0.9)V、1 mol·L^(-1)KNO_3中性溶液为电解液条件下,展现出最大比电容为157.0 F·g^(-1);3 000次循环后具有90.4%的比电容保持率。与文献报道的单一价态V_2O_5的循环性能相比较,这种混合价态钒氧化物V_(10)O_(24)·10H_2O的循环性能明显好很多。V10O24 · 10H20 nanoribbons were synthesized by a new hydrothermal method, starting from cheap V2O5and MnS04. The crystal structure, oxidation state of vanadium element, elements, morphology and the water content of the as-prepared sample were characterized by XRD, XPS, EDS,TG and SEM. Capacitive properties of the V10O24·10H2O electrode were firstly investigated in 1 mol · L^-1 KN03 and NaN03 electrolytes by cyclic voltammetry and galvanostatic charge/discharge test. The best initial specific capacitance of 157. 0 Fg^-1 was achieved in 1 mol · L^-1 KN03 electrolyte at the working voltage of -0.2 -0. 9 Y. After 3000 cycles, the capacity retention was 90. 4% . Obviously, the mixed-valence V10O24 · 10H20 exhibited better cyclic stability in contrast with the single-va-lence V2O5.

关 键 词：V2O5 MNSO4 V10O24·10H2O 电容性能 水系电解液 

分 类 号：O646.21[理学—物理化学] TM912.9[理学—化学]