Fe(Ⅲ)掺杂氧化钨薄膜电致变色性能的研究

Effect of doping of Fe(Ⅲ)on the performance of tungsten oxide electrochromic films

采用溶胶-凝胶法先制备了Fe(Ⅲ)掺杂的氧化钨(Fe(Ⅲ)-WO_(3))溶胶,随后通过浸渍提拉法将其沉积在FTO玻璃衬底上,再经过150℃热处理,得到了具有电致变色性能的Fe(Ⅲ)-WO_(3)薄膜。采用扫描电子显微镜(SEM)、X射线能谱分析(EDS)、热重分析(TG)、物相分析(XRD)、循环伏安法(CV)、计时电流法(CA)和紫外可见分光光度法(UV-Vis)等测试,对所得电致变色薄膜进行表征,探究了Fe(Ⅲ)掺杂浓度对氧化钨薄膜电致变色性能的影响。结果表明,制得的掺杂Fe(Ⅲ)的氧化钨电致变色薄膜具有优良的循环稳定性,其电致变色效率提高,最高电致变色范围可达70%,最高电致变色效率可达48.50 cm^(2)·C^(-1)。掺杂20 mmol/L的Fe(Ⅲ)-WO_(3)循环1000次后依然可以保持60%的电致变色范围。

In sol-gel method,tungsten oxide sol with Fe(Ⅲ)was firstly prepared,and then deposited on FTO glass substrate in the dip-coating process and finally dried at 150℃to prepare Fe(Ⅲ)-doped tungsten oxide(Fe(Ⅲ)-WO_(3))electrochromic films.Scanning electron microscopy(SEM),energy-dispersive X-ray spectroscopy(EDS),thermogravimetric analysis(TG),X-ray diffraction(XRD),cyclic voltammetry(CV),chronoamperometry(CA)and ultraviolet-visible spectrophotometry(UVVis)were applied to characterize the above prepared Fe(Ⅲ)-WO_(3)films.And the effect of Fe(Ⅲ)dopant concentration on the electrochromic properties of tungsten oxide films was investigated thoroughly.The results show that the Fe(Ⅲ)-WO_(3)electrochromic films have an excellent cycle life and high coloration efficiency,the highest transmittance change reaches 70%,the highest coloration efficiency is up to 48.50 cm^(2)·C-1 and the film doped with 20 mmol/L Fe(Ⅲ)still maintains about 60%of the transmittance change after 1000 cycles.