Pillar-Pore-Structured Nanophotonic Coating with Superior Solar and Thermal Modulation Abilities

Abstract

There is a growing focus on the development of advanced materials to enhance energy e ciency in space heating and cooling, which accounts for 13% of the annual consumption of global energy. Wavelength-selective dynamic regulation is undisputedly requisite to solve this problem. Radiative cooling materials work in the wavelength span of 8-14 µm, which is effective in heat dissipation.However, their xed emissivity results in unpleasant undercooling. Adaptive cooling materials can change emissivity in response to temperature shifts, solving the problem of overcooling, however they absorb too much solar heat in daytime, especially in summer. Hence, a material is requisite to have high re ectance in solar wavelengths (0.25 -2.5 µm). To address this issue, we propose a temperatureadaptive radiative cooling coating with high solar re ectance that e ciently re ects solar radiation and automatically switches its sky-window emissivity from 0.19 to 0.74, delivering an 85.92% solar re ectance for optimal energy e ciency and all-year-round thermal comfort within a speci c climate zone. The simulations demonstrate that our sample surpasses existing roo ng coatings in terms of energy e ciency across different climate zones, particularly those with substantial seasonal variations.