Aprotic Polar Electrolyte Facilitates Indoor Dynamic Optical-Thermal Management in Silver-Based Electro-Reflective Smart Windows
JOURNAL OF PHYSICAL CHEMISTRY C(2024)
摘要
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 degrees C. The device's switching threshold decreases with lower temperatures, moving from -1.97 V at 40 degrees C to -2.37 V at -40 degrees C. The coloration process completes in as swift as 3.5 s at 40 degrees C and in 13.6 s at -40 degrees C, while the bleaching process requires 16.3 s at 40 degrees C and extends to 71.0 s at -40 degrees C. Achieving high optical contrast (with a Delta T = 80% at 650 nm) at varied temperatures, the device also demonstrates exceptional durability across numerous cycles.
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