Novel spray-processable red-to-transmissive electrochromic polymers poly[3,4-di(2-ethylhexyloxy)thiophene-co-thiophene-co-3,4-di(methoxy)thiophene] with different monomer ratios have been synthesized and the electrochromic properties such as optical contrast, switching speed and long term switching stability were characterized. The incorporation of the simple thiophene unit into the polymer with the monomer ratio DEHOT : Th : DMOT = 1 : 0.2 : 0.8 successfully improves the switching speed (t95 = 1.6 s) with a high optical contrast ΔTmax = 56% at 518 nm, which constitutes a forward step toward the dynamic electrochromic displays.
Jun Zhang,Jiang-ping Tu,Xin-hui Xia,Xiu-li Wang,Chang-dong Gu
A hexagonal WO3 nanowire array film is obtained using a template-free hydrothermal method by adding ammonium sulfate as a capping agent. The WO3 nanowires grown vertically on a FTO-coated glass substrate are woven together at the surface of the film, forming well-aligned arrays at the bottom part and a porous surface morphology. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) reveal that each nanowire is a hexagonal single crystal and their long axes are oriented toward the [0001] direction. Due to the highly porous surface, good contact with the conductive substrate and large tunnels of the hexagonal-structured WO3, a fast switching speed of 7.6 and 4.2 s for coloration and bleaching, respectively, and a high coloration efficiency of 102.8 cm2C−1 are achieved for the WO3 nanowire array film.
Jianbo Pan,Rongzong Zheng,Yi Wang,Xingke Ye,Zhongquan Wan,Chunyang Jia,Xiaolong Weng,Jianliang Xie,Longjiang Deng
Functions of electrochromism and energy exchange can be achieved by redox reactions , which indicate designing a bi-functional electrochromic energy storage device (EESD) is feasible. In this paper, a NiO/PB composite nanosheet electrode was prepared via loading Prussian blue (iron (Ⅲ) hexacyanoferrate (Ⅱ), PB) nanoparticles on the surface of NiO nanosheets, meanwhile, a high-performance WO 3 negative electrode was also prepared via novel erythritol-assisted hydrothermal method with NH 4 Cl used as capping agent. The designed EESD exhibited properties of large optical modulation (67.6% at 630 nm), high coloration efficiency (109.6 cm 2 C -1 ), fast switching speed (2.8/7.9 s for bleaching/coloration) and long cycle life (ΔT remaining was 84.1% after 4000 cycles). Meanwhile, the EESD also obtained attractive energy storage properties at a potential window from 0 to +1.3 V. Impressively, the EESD exhibited a high areal capacitance of 11.50 mF cm -2 at current density of 0.05 mA cm -2 and the process of charging/discharging can be repeated at least 4000 cycles with a little decay. Therefore, the bi-functional EESD exhibits high promising application prospect.
危险品化学品经营许可证（带存储）