Optical, electrochemical and structural properties of long-term cycled tungsten oxide films prepared by sol-gel
Optical, electrochemical and structural properties of long-term cycled tungsten oxide films prepared by sol-gel
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DOI：
10.1016/j.physb.2007.03.031
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发表时间：
2007-06-15
影响因子：
2.8
通讯作者：
He, Deyan
中科院分区：
文献类型：
--
作者：
Huang, Kai;Jia, Jianfeng;He, Deyan
采用溶胶-凝胶浸包法制备了过氧化物多钨酸溶胶。以制备的WO3薄膜为活性工作电极，制备了含0.5 mol/L H2SO4电解质的三电极电池。采用紫外可见分光光度计、循环伏安法（CV）、x射线衍射仪（XRD）、扫描电镜（SEM）等对膜的光学、电化学和结构性能进行了表征。该薄膜表现出稳定的可逆和可重复的电化学开关行为，可达1000次染色漂白循环。循环超过2000次的膜的XRD谱峰，在长时间循环的膜表面观察到不规则的裂纹、均匀的纳米颗粒和新颖的纳米叶片。电致变色性能的退化是由于长期循环后薄膜变松、结晶所致。(c) 2007 Elsevier B.V.版权所有
A peroxopolytungstic acid sol has been employed for preparing tungsten oxide (WO3) films by sol-gel dip-coating technique. Three-electrode cells with 0.5 mol/L H2SO4 electrolyte were fabricated using the prepared WO3 films as active working electrode. Optical, electrochemical and structural properties of the films as a function of coloration-bleaching cycle were characterized by ultraviolet-visible spectrophotometer, cyclic voltammetry (CV), X-ray diffraction (XRD), scanning electron microscopy (SEM). The films showed a stable behavior of reversible and reproducible electrochemical switching up to 1000 coloration-bleaching cycles. XRD peaks were found for the films being cycled more than 2000, and the irregular cracks, uniform nano-particles and novel nano-blades were observed on the long-term cycled film surface by SEM. The degradation of the electrochromic behavior is due to the film change to loose and crystallization after the long-term cycling. (c) 2007 Elsevier B.V. All rights reserved.