Multicolor V2O5/TiO2 electrochromic films with fast switching and long lifespan for camouflage and information display
V2O5,which has multicolor and energy storage properties,is a promising electrochromic material for multi-functional electrochromic devices,but its practical application is limited by its poor lifespan and long switching time.In this work,high-performance V2O5/TiO2 films were fabricated by spraying a V2O5 solution on in situ-grown TiO2 nanorods.Due to the porous structure formed between the TiO2 nanorods and the remarkable electron transfer performance of TiO2,the switching time of the V2O5/TiO2 films decreased.Moreover,the strong adhesion between the TiO2 nanorods and F-doped tin oxide(FTO)glass and the increased surface roughness of the substrates significantly improved the cycling stability of the V2O5/TiO2 films.With a large transmittance modulation(47.8％at 668 nm),fast response speed(τc=5.1 s,τb=4.2 s),and long lifespan,V2O5/TiO2 films were used as electrodes for the electrochromic energy storage device(EESD),which switched in six colors through color overlay:dark orange,sandy yellow,green-yellow,yellow-green,dark green,and dark brown.Inspired by pixel displays,EESDs were designed by segmenting V2O5 films to stagger the display of the elec-trochromic and ion storage layers,which presented 11 types of information based on different combinations of colors.This work provides inspiration for developing multifunctional electrochromic devices,especially for camouflage and in-formation displays.
V2O5/TiO2 filmselectrochromic energy storage de-vicesmulticolor display
王杏如、郑洋、陈莉蓉、葛锐、江成玉、徐刚、肖秀娣
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School of Energy Science and Engineering,University of Science and Technology of China,Hefei 230026,China
Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development,Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China
School of Physics and Optoelectronics,South China University of Technology,Guangzhou 510640,China
State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640,China
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V2O5/TiO2 films electrochromic energy storage de-vices multicolor display
National Natural Science Foundation of ChinaOpen Fund of the State Key Laboratory of Luminescent Materials and Devices
NETL
NSTL
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