Simultaneously enabling dynamic transparency control and electrical energy storage via electrochromism,Nanoscale Horizons

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Simultaneously enabling dynamic transparency control and electrical energy storage via electrochromism
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2020-01-02 , DOI: 10.1039/c9nh00751b
Haizeng Li _{1,

2,

3,

4,

5} , Abdulhakem Y. Elezzabi _{1,

2,

3,

4,

5}

Affiliation

Transparency-switchable electrochromic devices (ECDs) offer promising applications, including variable optical attenuators, optical shutters, optical filters, and smart windows for energy-efficient buildings. However, the operation of conventional ECDs requires external voltages to trigger coloration/de-coloration processes, which makes them far from being an optimal energy-efficient technology. Electrochromic batteries that incorporate electro-optical modulation and electrical energy storage functionalities in a single platform, are highly-promising in the realization of energy-efficient ECDs. Herein, we report a novel Zn–Prussian blue (PB) system for aqueous electrochromic batteries. By utilizing different dual-ion electrolytes with various cations (e.g. Zn²⁺–K⁺ and Zn²⁺–Al³⁺), the Zn–PB electrochromic batteries demonstrate excellent performance. We show that the K⁺–Zn²⁺ dual-ion electrolyte in the Zn–PB configuration endows a rapid self-bleaching time (2.8 s), a high optical contrast (83% at 632.8 nm), and fast switching times (8.4 s/3 s for the bleaching/coloration processes). Remarkably, the aqueous electrochromic battery exhibits a compelling energy retrieval of 35.7 mW h m⁻², where only 47.5 mW h m⁻² is consumed during the round-trip coloration–bleaching process. These findings may open a new direction for developing advanced net-zero energy-consumption ECDs.

中文翻译：

通过电致变色同时实现动态透明度控制和电能存储

透明可切换电致变色设备（ECD）提供了有希望的应用，包括可变光衰减器，光学百叶窗，光学滤波器和节能建筑的智能窗户。然而，常规ECD的操作需要外部电压来触发着色/脱色过程，这使得它们远不是最佳的节能技术。将电光调制和电能存储功能集成在一个平台中的电致变色电池在实现节能型ECD方面具有很高的前景。在此，我们报告了一种用于水性电致变色电池的新型Zn-普鲁士蓝（PB）系统。通过利用具有各种阳离子（例如Zn ²⁺ –K ⁺和Zn ²⁺ –Al ³⁺），则Zn–PB电致变色电池表现出出色的性能。我们显示，Zn-PB配置中的K ⁺ –Zn ²⁺双离子电解质具有快速的自漂白时间（2.8 s），高的光学对比度（在632.8 nm处为83％）和快速的切换时间（8.4） s / 3 s（用于漂白/着色过程）。值得注意的是，水性电致变色电池表现出令人信服的35.7 mW hm ^-2的能量回收，其中在往返着色-漂白过程中仅消耗了47.5 mW hm ^-2。这些发现可能为开发先进的零净能耗ECD开辟新的方向。

更新日期：2020-01-02

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