离子储存电极薄膜性能的影响
Effect of TiO2 on the Properties of V2O5 Electrochemical Ion Storage Films

采用溶胶？材？胶技术制备出(TiO2)x？？V2O5复合离子存储电极薄膜,主要研究了有机、无机Ti源,TiO2掺杂量(x为0、0.05、0.1、0.2、0.3 mol)等对V2O5薄膜结构与性能的影响。通过场发射扫描电镜(FE？？SEM)、循环伏安测试(CV)、紫外？部杉？光谱等手段研究了薄膜的表面形貌、电化学性能和光学性能。结果表明,TiO2掺杂降低了V2O5薄膜离子储存容量,采用无机Ti源四氯化钛较有机Ti源钛酸丁酯掺杂的复合薄膜具有更高的可见光透过率以及离子储存容量,与V2O5薄膜相比,透射率增大了20％。随着无机Ti源掺量增多,薄膜离子储存容量降低,但在循环过程中降低趋势减缓并逐渐保持稳定,50次循环后纯V2O5薄膜储存容量降低了25％,掺杂TiO2后平均降低16％,V2O5薄膜循环稳定性有所提高。TiO2掺杂显著降低了V2O5阴极的着色效应,随着TiO2掺量的增加,复合薄膜光透过性增强。
(TiO2)x？？V2O5composite electrochemical ion storage films were prepared by sol？？gel method. The effects of organic？？inorganic Ti source and doping amount of TiO2 (x=0, 0.05, 0.1, 0.2, 0.3 mol)on the microstructure and properties of V2O5films were investigated. The surface morphology, electrochemical performance and optical property were characterized by FE？？SEM, cyclic voltammetry and UV？？Vis transmission, respectively. The results show that TiO2 doping reduces the ion storage capacity of V2O5 films, and (TiO2)x？？V2O5 composite films prepared by inorganic Ti source have higher UV？？Vis transmittance and ion storage capacity than that by organic Ti source. The UV？？Vis transmittance of (TiO2)x？？V2O5 composite films prepared by inorganic Ti source is 20％ higher than that of V2O5 film. Meanwhile, the ion storage capacity of V2O5 films prepared by inorganic Ti source decreases with the Ti content. However, the decreasing trend of ion storage capacity of V2O5 films becomes gradually slow and then keeps stable during the cycles after doping TiO2. The cycle stability of V2O5 films can be improved by doping TiO2, and the storage capacity of V2O5 film after 50 cycles is reduced by 25％ and 16％ in average without and with doping TiO2, repectively. Moreover, doping TiO2 significantly reduces the cathode coloring effect of V2O5 electrochemical ionic storage films. With the increase of TiO2 doping amount, the UV？？Vis transmittance improves