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A Trilayer Structure with Surface Binary Microsphere Array for Radiative Cooling and Heating Regulation
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DOI：10.1021/acsphotonics.4c00833.png)
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Abstract
En 中文
Passive daytime radiative cooling is of tremendous interest but would overcool during cold nights or winter days, exacerbating the heating cost, especially in high-latitude areas. Integrating the heating and cooling in one photothermal system can avoid cooling penalties and potential barriers for wide practical scenarios. Herein, we demonstrate a trilayer structure with visible and infrared spectral engineering for all-season radiative cooling and heating. The cooling mode with a solar reflectivity of 0.95 and a mid-infrared emissivity of 0.98 endows a comparable daytime subambient cooling of 9.8 degrees C with a theoretically net cooling power of 76.6 W/m(2). Meanwhile, the heating mode with a solar absorptivity of 0.88 and a mid-infrared emissivity of 0.28 yields a daytime above-ambient heating of 16.3 degrees C with a theoretical net heating power of 667.8 W/m(2). Promisingly, the surface binary microsphere array further enhances the mid-infrared emissivity, superhydrophobicity, and environmental durability, making the trilayer structure a viable pathway for thermal management with great potential in electricity savings and CO2 emission reduction. This work offers new possibilities for designing next-generation radiative cooling materials, greatly widening the scope of use.
Keywords:
radiative cooling
trilayer structure
binarymicrosphere array
solar heating
energy-saving
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