Multicolor V2O5/TiO2 electrochromic films with fast switching and long lifespan for camouflage and information display

IF 6.8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science China Materials Pub Date : 2024-07-17 DOI:10.1007/s40843-023-2837-x

Xingru Wang (, ), Yang Zheng (, ), Lirong Chen (, ), Rui Ge (, ), Chengyu Jiang (, ), Gang Xu (, ), Xiudi Xiao (, )

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Abstract

V₂O₅, which has multicolor and energy storage properties, is a promising electrochromic material for multifunctional 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 (τ_c = 5.1 s, τ_b = 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 electrochromic 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 information displays.

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用于伪装和信息显示的多色 V2O5/TiO2 电致变色薄膜，切换速度快，使用寿命长

V2O5 具有多色和储能特性，是一种很有前途的电致变色材料，可用于多功能电致变色装置，但其实际应用却因寿命短和开关时间长而受到限制。本研究通过在原位生长的 TiO2 纳米棒上喷涂 V2O5 溶液，制备了高性能 V2O5/TiO2 薄膜。由于 TiO2 纳米棒之间形成的多孔结构以及 TiO2 显著的电子传递性能，V2O5/TiO2 薄膜的开关时间缩短。此外，TiO2 纳米棒与掺杂 F 的氧化锡（FTO）玻璃之间的强粘附性以及基底表面粗糙度的增加显著提高了 V2O5/TiO2 薄膜的循环稳定性。V2O5/TiO2 薄膜具有透射率调制幅度大（在 668 纳米波长下为 47.8%）、响应速度快（τc = 5.1 秒，τb = 4.2 秒）和使用寿命长的特点，因此被用作电致变色储能装置（EESD）的电极，该装置可通过颜色叠加实现六种颜色的切换：深橙色、沙黄色、黄绿色、黄绿色、深绿色和深褐色。受像素显示器的启发，EESD 通过分割 V2O5 薄膜来错开显示电致变色层和离子存储层，从而根据不同的颜色组合显示 11 种信息。这项工作为开发多功能电致变色器件，特别是用于伪装和信息显示提供了灵感。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.