2026-05-12 JOURNAL OF MATERIALS CHEMISTRY A 2026 14(卷), 28(期), (18000-18008页)
Atmospheric water harvesting (AWH) is often limited by the efficiency trade-offs between water capture and release. Here, we developed a dual-layer nanofibrous membrane (PM-PC NFM) through electrospinning that synergistically couples nocturnal radiative cooling with diurnal photothermal heating. By integrating MIL-101(Cr) into a hierarchical porous network, the membrane achieves a mid-infrared emissivity of 0.90, enabling a sub-ambient cooling of 4.3 degrees C at night. This effect enhances water adsorption by 29%, increasing the equilibrium capacity to 0.62 g g(-1). During the day, the carbon black-doped layer provides a solar absorptance of 96%, increasing the surface temperature to similar to 60 degrees C and enabling >95% water release within 20 minutes under 0.6 kW m(-2) solar flux. With a cumulative water yield exceeding 20 g over 10 cycles, this passive bilayer system offers a highly stable and electricity-free strategy for high-performance water harvesting in arid regions.
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