The electrochromic devices explored in this study show tremendous promise for energy conservation, enabling active, adaptive control of solar heat and lighting in buildings. However, a majority of existing devices fail to perform optimally in areas with significant temperature fluctuations. Addressing this challenge, we introduce a new aprotic polar electrolyte (APE) for use in a reversible silver deposition electrochromic device. This novel device boasts an impressive ability to switch from a highly transparent state (with light transmittance at 650 nm being equal to or greater than 80%) to a reflective mirror-like state (with light transmittance at 650 nm being equal to or less than 1%) across an extensive temperature range spanning from −40 to 40 °C. The device’s switching threshold decreases with lower temperatures, moving from −1.97 V at 40 °C to −2.37 V at −40 °C. The coloration process completes in as swift as 3.5 s at 40 °C and in 13.6 s at −40 °C, while the bleaching process requires 16.3 s at 40 °C and extends to 71.0 s at −40 °C. Achieving high optical contrast (with a ΔT = 80% at 650 nm) at varied temperatures, the device also demonstrates exceptional durability across numerous cycles.

中文翻译：

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非质子极性电解质促进银基电反射智能窗户的室内动态光热管理

本研究中探索的电致变色器件在节能方面显示出巨大的前景，能够对建筑物中的太阳热和照明进行主动、自适应控制。然而，大多数现有设备无法在温度波动较大的地区发挥最佳性能。为了解决这一挑战，我们推出了一种新型非质子极性电解质（APE），用于可逆银沉积电致变色器件。这种新颖的器件具有从高透明状态（650 nm处的透光率等于或大于80%）到反射镜状状态（650 nm处的透光率等于或小于80%）的令人印象深刻的能力。 1%），覆盖-40至40°C的广泛温度范围。该器件的开关阈值随着温度的降低而降低，从 40 °C 时的 -1.97 V 变为 -40 °C 时的 -2.37 V。着色过程在 40 °C 下仅需 3.5 s，在 -40 °C 下仅需 13.6 s，而漂白过程在 40 °C 下需要 16.3 s，在 -40 °C 下需要 71.0 s。该器件在不同温度下可实现高光学对比度（650 nm 处 Δ T = 80%），并且在多次循环中也表现出卓越的耐用性。