摘要
V2O5具有多色和储能特性,是一种有前景的电致变色材料,但由于其寿命短、切换时间长等使其应用受到限制.本文通过在原位生长的TiO2纳米棒上喷涂V2O5溶液制备了高性能的V2O5/TiO2薄膜.通过X射线衍射(XRD)、扫描电子显微镜(SEM)、原子力显微镜(AFM)以及电化学阻抗谱(EIS)等方法对薄膜进行了表征,并阐述了改善机理.V2O5/TiO2薄膜具有较大的光学调制幅度(668 nm处为47.8％)、较快的响应速度(Tc/Tb=5.1 s/4.2 s)和高循环稳定性.基于V2O5/TiO2薄膜设计了电致变色储能器件,通过颜色叠加器件显示出6种颜色的变化:深橙色、沙黄色、绿黄色、黄绿色、深绿色和深棕色.通过分割薄膜使电致变色和离子存储层交错显示制备了信息显示电致变色器件,不同的颜色组合可呈现11种类型的信息.本文中基于V2O5/TiO2薄膜的多功能电致变色器件可应用于伪装、信息显示以及能量可视化监测等领域.
Abstract
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.
基金项目
National Natural Science Foundation of China(62375268)
Open Fund of the State Key Laboratory of Luminescent Materials and Devices(2023-skllmd-05)
NETL
NSTL
万方数据