Gel polymer electrolyte for reversible metal electrodeposition dynamic windows enables dual-working electrodes for faster switching and reflectivity control
Gel polymer electrolyte for reversible metal electrodeposition dynamic windows enables dual-working electrodes for faster switching and reflectivity control
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DOI：
10.3389/fnano.2022.1083247
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发表时间：
2022-11-28
影响因子：
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通讯作者：
McGehee, Michael D.
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文献类型：
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作者：
Cai, Yuchun;Hernandez, Tyler S.;McGehee, Michael D.
基于可逆金属电沉积的动态窗是一种极具吸引力的提高建筑能效的方法，具有巨大的商业潜力。当两个电极接触时，依赖于液体电解质的动态窗口有短路的危险，特别是在更大规模的情况下。在这里，我们开发了一种透光率为85%的聚乙烯醇（PVA）凝胶聚合物电解质（GPE），也就是说，它的硬度足以作为分离器。GPE被实现到具有与使用液体电解质的窗口相当的电化学和光学特性的窗口中。此外，GPE能够制造具有双工作电极（WE）和中心金属网状反电极的窗口，而不会发生短路。我们的双we PVA GPE窗口在101秒内达到0.1%的透光率状态，是单电极液体窗口（207秒）速度的两倍多。此外，双we GPE窗户的每一面都可以单独着色，以展示不同的光学效果（即，更反射，或更吸收），为用户和智能建筑系统提供更好的控制外观和性能的窗户在一个单一的设备架构。
Dynamic windows based on reversible metal electrodeposition are an attractive way to enhance the energy efficiency of buildings and show great commercial potential. Dynamic windows that rely on liquid electrolytes are at risk of short circuiting when two electrodes contact, especially at larger-scale. Here we developed a poly (vinyl alcohol) (PVA) gel polymer electrolyte (GPE) with 85% transmittance, that is, sufficiently stiff to act as a separator. The GPE is implemented into windows that exhibit comparable electrochemical and optical properties to windows using a liquid electrolyte. Furthermore, the GPE enables the fabrication of windows with dual-working electrodes (WE) and a metal mesh counter electrode in the center without short-circuiting. Our dual-WE PVA GPE window reaches the 0.1% transmittance state in 101 s, more than twice the speed of liquid windows with one working electrode (207 s). Additionally, each side of the dual-WE GPE window can be tinted individually to demonstrate varied optical effects (i.e., more reflective, or more absorptive), providing users and intelligent building systems with greater control over the appearance and performance of the windows in a single device architecture.