摘要
Constructs a bilayer passive cooler integrating radiative and evaporative cooling. • Achieves high solar reflectance and strong mid-infrared emissivity. • Enables rapid moisture sorption and stable evaporative cooling. • Reduces building cooling energy consumption across diverse climate zones. The rapidly growing demand for space cooling, driven by urbanization and climate change, poses significant challenges to energy sustainability and carbon mitigation. Passive daytime radiative cooling offers a promising low-energy cooling strategy but is fundamentally constrained by climatic sensitivity and limited cooling power. Here, inspired by thermohygroregulation in desert mammals, we report a self-sustained coupled radiative-evaporative (CRE) cooling material that integrates radiative and evaporative cooling within a bilayer architecture. The CRE cooler comprises a porous polyethylene aerogel top layer with ultrahigh solar reflectance (∼98.0%) and high mid-infrared transparency, and a salt-based hygroscopic composite bottom layer encapsulated within a porous polytetrafluoroethylene membrane, enabling reversible moisture sorption and evaporation through a closed water cycle. Benefiting from hierarchical pore engineering, the CRE cooler exhibits high mid-infrared emissivity (∼0.92), low thermal conductivity (∼38 mW m −1 K −1 ), rapid moisture uptake (up to 1.72 g g −1 at 60% RH), and weakly humidity-dependent evaporation behavior. Outdoor experiments demonstrate robust daytime cooling of up to ∼5.1 °C relative to an uncovered control and ∼2.6–3.0 °C compared with a radiative-only cooler under both sunny and cloudy conditions. Building energy simulations across 18 global cities reveal annual cooling energy savings of 6.7%–21.2% and carbon emission reductions of 1.5–5.0 tCO 2 -eq. This work establishes a biomimetic and climate-resilient strategy for synergistic passive cooling with strong potential for low-carbon building thermal management.
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