二氧化锰/普鲁士蓝纳米复合薄膜的制备及其电致变色性能

Preparation and Electrochromic Properties of Manganese Dioxide/Prussian Blue Nanocomposite Film

采用两步电沉积法在导电玻璃表面成功制备了二氧化锰/普鲁士蓝纳米复合薄膜。首先,以四水乙酸锰和无水硫酸钠为原料配制电解质溶液,通过电沉积法直接在导电玻璃表面沉积纳米二氧化锰薄膜。其次,以铁氰化钾、氯化钾和无水氯化铁为原料配制电解质溶液,沉积普鲁士蓝薄膜,表征了复合薄膜的结构,分析了复合薄膜的电致变色特性。结果表明,电沉积得到的二氧化锰为片状结构,且片的厚度小于10 nm,沉积在二氧化锰纳米片上的普鲁士蓝呈球状结构,直径约200 nm,形成了致密的、有裂纹的膜层。所制备的复合薄膜具有良好的电致变色性能。在400～800 nm的可见光范围平均光调制幅度达到52%,着色时间和褪色时间分别为4.3 s和3.6 s,着色效率达到68.4 cm2/C。

Manganese dioxide/Prussian blue nanocomposite film was successfully prepared on the surface of the transparent conductive glass by two-step electrodeposition. Firstly, nanostructured manganese dioxide film was directly deposited on the transparent conductive glass by electrodeposition, where the electrolyte solution was prepared by using manganese sulfate tetrahydrate and anhydrous sodium sulfate as raw materials. Then Prussian blue film was grown on the manganese dioxide coated transparent conductive glass by electrodeposition, where potassium ferricyanide, potassium chloride and anhydrous ferric chloride were used as raw materials. The morphology and microstructure of the nanocomposite film were characterized, and electrochromic performaces of the as-prepared film were also investigated. The results showed that manganese dioxide nanosheets with a thickness of less than 10 nm were obtained, and Prussian blue deposited on the manganese dioxide nanosheet has a spherical structure with a diameter of about 200 nm, forming a dense and cracked film layer. The as-prepared nanocomposite film showed good electrochromic properties. The average optical modulation in the visible range of 400-800 nm was 52%. Switch responses were 4.3 s for coloration and 3.6 s for bleaching respectively, and coloration efficiency of the device was 68.4 cm2/C.