A Solar-Driven Flexible Electrochromic Supercapacitor

Materials

Wenkui Zhang¹  Yongping Gan¹  Jun Zhang¹  Yang Xia¹  Baolin Sun¹  Hui Huang¹  Chu Liang¹  Danni Zhang¹ 

[1] College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China;

关键词: photoelectrochromic devices (pecd);    dye-sensitized solar cells (dssc);    electrochromic devices (ecd);    smart windows;    flexible devices;   

DOI  :  10.3390/ma13051206

来源: DOAJ

【 摘 要 】

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 TiO₂ thick film and the electrochromic layer is a WO₃ thin film, which also possesses a supercapacitive property. Under illumination, dye-sensitized TiO₂ thick film realizes photo-drive electrochromism that the WO₃ 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⁻² (114.9 F·g⁻¹ vs the mass of WO₃), 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.

【 授权许可】

Unknown