Hierarchical-porous coating coupled with textile for passive daytime radiative cooling and self-cleaning

Passive daytime radiant cooling (PDRC) technology is an energy-free and ecologically beneficial cooling solution compared to conventional electric cooling. The limited cooling efficiency and impossibility of mass manufacture, however, severely restrict its popularization and application. This study uses a combination of template and etching techniques to construct a hierarchically porous Poly (vinylidene fluoride-co-hexafluoropropene) (P(VDF-HFP) coating with controlled pore size and porosity. Coated textiles have strong solar reflectances (0.93) and infrared emittances (0.98) thanks to the organization of specific micro-nano multi-level pore size and high porosity, which results in a subambient temperature drop of around 9.0 degrees C. Due to its porous structure, the coated textile possesses a considerable bit of flexibility and self-cleaning capabilities. The present work paves a new way for the mass production of radiate cooling textiles with a controlled coating structure and exceptional cooling performance.

Automated summary

This study utilizes a combination of template and etching techniques to construct hierarchically porous P(VDF-HFP) coating with controlled pore size and porosity, resulting in coated textiles with strong solar reflectances and infrared emittances, as well as flexibility and self-cleaning capabilities.