Kai Sheng,Mahmoud A. Khalifa,Zitao Wang,Jianming Zheng,Chunye Xu
Developing a low-cost and efficient Photovoltachromic Device (PVCD) can address the requirements of energy-harvesting smart windows . In this work, low-cost poly(3,4-(2,2-dimethylpropylenedioxy)thiophene) (PProDOT-Me 2 ) is presented for replacing expensive Pt and achieving a WO 3 -based PVCD with rapid bleaching speed. The device consists of the proposed WO 3 /PProDOT-Me 2 electrode, an electrolyte containing I − /I 3 − redox couple , and dye-sensitized TiO 2 photoanode. The PVCD changes state between colored and bleached by simply altering the open and short circuit of the device. The PVCD achieves high optical contrast of 45.1% at 680 nm with a fast bleaching time of 15.5 s, coloring time of 3.6 s, and cycling stability over 200 cycles. These unique characteristics result from the PProDOT-Me 2 could help accelerate the electrochromic process of WO 3 and fast transferring charges to the electrolyte that enhances photovoltaic performance . The accelerating mechanism is analyzed and the related experimental evaluations are executed. This study reveals promising prospects of the proposed WO 3 -PProDOT-Me 2 electrode for low-cost PVCD.
Mahmoud A. Khalifa,Kai Sheng,Zitao Wang,Jianming Zheng,Chunye Xu
Developing a low-cost and transparent counter electrode (CE) for a self-powered electrochromic device (SP-ECD) can address the requirements of building-integrated photovoltaics (BIPVs). Herein, a new partly covered poly(3,4-(2,2-dimethylpropylenedioxy) thiophene) (PProDOT-Me 2 ) on MoS 2 nanosheets CE is developed for replacing an expensive Pt CE and achieving high-performance SP-ECD. The device consists of the proposed CE, an electrolyte containing Br − /Br 3 − redox pair, and a working electrode made with a dye-sensitized TiO 2 photoanode integrated with PProDOT-Me 2 . ECD changes its color between deep blue and colorless by varying the illuminated light on and off. Measurements reveal that the ECD achieves a transmittance modulation of 46% at 580 nm with cycling stability over 500 cycles (4% contrast attenuation) that are about five times stable than that based on Pt or MoS 2 CE. In addition, the switching speed between colored and bleached states is fast under a light on and off, with a coloration time of 2.1 s and a bleaching time of 1.5 s. These characteristics result from the unique design of CE and can be beneficial in accelerating the electrochromic process and enhancing the self-powered performance for good cycling stability. This study reveals a new approach to prepare good CE for efficient SP-ECD in BIPVs.
危险品化学品经营许可证（带存储）