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A Highly Stable and Tunable Visible‐Near‐IR Electrochromic All‐in‐One Gel Device
ChemPhotoChem ( IF 3.0 ) Pub Date : 2020-02-03 , DOI: 10.1002/cptc.201900284
Huan Ling 1, 2 , Fengyu Su 2, 3, 4 , Yanqing Tian 2 , Dan Luo 3 , Yan Jun Liu 3 , Xiao Wei Sun 3
Affiliation  

Energy saving is a global topic of critical importance. Electrochromic devices (ECDs) could be used to control energy flow by modulating the light absorption reversibly upon application of a small potential bias. Herein, a visible‐NIR dual‐band ECD based on the viologen analogue 4, 4′‐(thiophene‐2, 5‐diyl) bis(1‐methylpyridin‐1‐ium) diiodide (TMP) was assembled with a simple all‐in‐one configuration. The TMP‐based gel ECD possesses high dynamic contrast (81.7 % at 570 nm, 68.6 % at 835 nm, 62.8 % at 910 nm and 55.3 % at 1046 nm), excellent cyclic stability (70.6 % of ▵T at 570 nm maintained after 25000 cycles at 1.4 V), and low power consumption (15.2 mJ/cm2 to complete the coloring process, 2.5 mW/cm2 to keep color and low transmittance). Remarkably, the absorption of visible and NIR light could be selectively adjusted by varying the coloring time. For comparison, a dimethyl viologen (DMV)‐based gel ECD was fabricated, and the SAR (structure‐activity relationship) was established by cyclic voltammetry, density functional theory (DFT) calculations, and other electrochromic performance parameters.

中文翻译:

高度稳定且可调的可见光近红外电致变色多合一凝胶设备

节能是至关重要的全球性话题。电致变色器件(ECD)可用于通过在施加小的电位偏置时可逆地调节光吸收来控制能量流。本文中,基于紫罗兰类似物4,4,′(噻吩-2,5-二基)双(1-甲基吡啶-1-鎓)二碘化物(TMP)的可见NIR双波段ECD与简单的全一体式配置。基于TMP的凝胶ECD具有很高的动态对比度(在570 nm处为81.7%,在835 nm处为68.6%,在910 nm处为62.8%,在1046 nm处为55.3%),出色的循环稳定性(在570 nm后保持7 T的70.6%)在1.4 V下进行25000次循环),低功耗(15.2 mJ / cm 2即可完成着色过程),2.5 mW / cm 2保持色彩和低透射率)。值得注意的是,可见光和近红外光的吸收可以通过改变着色时间来有选择地调节。为了进行比较,制备了基于二甲基紫罗兰(DMV)的凝胶ECD,并通过循环伏安法,密度泛函理论(DFT)计算和其他电致变色性能参数建立了SAR(结构-活性关系)。
更新日期:2020-02-03
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