Zhang Danni, Sun Baolin, Huang Hui, Gan Yongping, Xia Yang, Liang Chu, Zhang Wenkui, Zhang Jun
College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
Materials (Basel). 2020 Mar 9;13(5):1206. doi: 10.3390/ma13051206.
Solar-driven electrochromic smart windows with energy-storage ability are promising for energy-saving buildings. In this work, a flexible photoelectrochromic device (PECD) was designed for this purpose. The PECD is composed of two flexible transparent conductive layers, a photocatalytic layer, an electrochromic material layer, and a transparent electrolyte layer. The photocatalytic layer is a dye-sensitized TiO thick film and the electrochromic layer is a WO thin film, which also possesses a supercapacitive property. Under illumination, dye-sensitized TiO thick film realizes photo-drive electrochromism that the WO changes from colorless to blue with large optical modulation. Meanwhile, the PECD has an electrochemical supercapacitance showing an energy storage property of 21 mF·cm (114.9 F·g vs the mass of WO), stable mechanical performance and long cycle performance. The PECD can effectively adjust the transmittance of visible and near-infrared light without any external power supply, realizing zero energy consumption, and can convert solar energy into electrical energy for storage.
具有储能能力的太阳能驱动电致变色智能窗在节能建筑方面具有广阔前景。在这项工作中，为此设计了一种柔性光电致变色器件（PECD）。该PECD由两个柔性透明导电层、一个光催化层、一个电致变色材料层和一个透明电解质层组成。光催化层是染料敏化TiO厚膜，电致变色层是WO薄膜，其还具有超级电容特性。在光照下，染料敏化TiO厚膜实现光驱动电致变色，即WO由无色变为蓝色，具有较大的光学调制。同时，该PECD具有电化学超级电容，表现出21 mF·cm的储能特性（相对于WO的质量为114.9 F·g）、稳定的机械性能和长循环性能。该PECD无需任何外部电源即可有效调节可见光和近红外光的透过率，实现零能耗，并能将太阳能转化为电能进行存储。
