Atmospheric water harvesting (AWH) technology is a promising technology for addressing global water shortages and contributing to social development. Current AWH technologies, including fog collection, dew collection, and sorption-based AWH mostly focus on a single water harvesting mechanism, and this can limit their working conditions and overall performance. In this work, a composite hydrogel with a low phase change enthalpy of water (1695 kJ kg⁻¹) was coupled with radiative cooling and solar heating to improve passive AWH performance and working conditions. High thermal emittance ${\overline{\epsilon }}_{\mathrm{L}\mathrm{W}\mathrm{I}\mathrm{R}}$ = 0.98 and solar absorptance ${\overline{\alpha }}_{\mathrm{s}\mathrm{o}\mathrm{l}\mathrm{a}\mathrm{r}}$ = 0.93 were achieved for radiative cooling in the nighttime and solar heating in the daytime. During the night, radiative cooling could improve the water capture rate from 0.242 kg m^-2h⁻¹ (i.e., only sorbent) to 0.310 kg m^-2h⁻¹ (i.e., sorbent-coupled radiative cooling) in the outdoor experiment. In the daytime, solar interfacial evaporation improved the water release rate to 1.154 kg m^-2h⁻¹. Effects of meteorological parameters, such as relative humidity, ambient temperature, and solar intensity were also discussed theoretically and experimentally. It is indicated that the designed passive AWH device can work over a wide range of meteorological parameters. The outdoor all-day experiment indicated that the maximum water harvesting can be 2.04 kg m⁻² in a cycle work. This demonstrates that sorbent-coupled radiative cooling and solar heating provide a potential approach for future solar-driven AWH systems.

大气集水（AWH）技术是解决全球水资源短缺和促进社会发展的一项有前景的技术。目前的 AWH 技术，包括雾收集、露水收集和基于吸附的 AWH 大多集中于单一的集水机制，这会限制其工作条件和整体性能。在这项工作中，具有低水相变焓（1695 kJ kg ^-1 ）的复合水凝胶与辐射冷却和太阳能加热相结合，以改善被动式AWH性能和工作条件。高热发射率${\stackrel{<span\; data-immersive-translate-walked="c2180f84-2d93-4e22-a4ae-0037aed8a341">￣</span>}{\mathrm{<span\; data-immersive-translate-walked="c2180f84-2d93-4e22-a4ae-0037aed8a341">\epsilon </span>}}}_{\mathrm{<span\; data-immersive-translate-walked="c2180f84-2d93-4e22-a4ae-0037aed8a341">L</span>}\mathrm{<span\; data-immersive-translate-walked="c2180f84-2d93-4e22-a4ae-0037aed8a341">瓦</span>}\mathrm{<span\; data-immersive-translate-walked="c2180f84-2d93-4e22-a4ae-0037aed8a341">我</span>}\mathrm{<span\; data-immersive-translate-walked="c2180f84-2d93-4e22-a4ae-0037aed8a341">右</span>}}$= 0.98 和太阳能吸收率${\stackrel{<span\; data-immersive-translate-walked="c2180f84-2d93-4e22-a4ae-0037aed8a341">￣</span>}{\mathrm{<span\; data-immersive-translate-walked="c2180f84-2d93-4e22-a4ae-0037aed8a341">\alpha </span>}}}_{\mathrm{<span\; data-immersive-translate-walked="c2180f84-2d93-4e22-a4ae-0037aed8a341">s</span>}\mathrm{<span\; data-immersive-translate-walked="c2180f84-2d93-4e22-a4ae-0037aed8a341">哦</span>}\mathrm{<span\; data-immersive-translate-walked="c2180f84-2d93-4e22-a4ae-0037aed8a341">我</span>}\mathrm{<span\; data-immersive-translate-walked="c2180f84-2d93-4e22-a4ae-0037aed8a341">A</span>}\mathrm{<span\; data-immersive-translate-walked="c2180f84-2d93-4e22-a4ae-0037aed8a341">r</span>}}$夜间辐射冷却和白天太阳能加热的结果为 = 0.93。在室外实验中，夜间辐射冷却可以将水捕获率从0.242 kg m ^-2 h ^-1 （即仅吸附剂）提高到0.310 kg m ^-2 h ^-1 （即吸附剂耦合辐射冷却）。白天，太阳界面蒸发将水释放率提高至1.154 kg m ^-2 h ^-1 。 还从理论上和实验上讨论了相对湿度、环境温度和太阳强度等气象参数的影响。结果表明，所设计的无源AWH装置可以在较宽的气象参数范围内工作。室外全天实验表明，一次循环工作最大集水量可达2.04 kg m ^-2 。这表明吸附剂耦合辐射冷却和太阳能加热为未来太阳能驱动的 AWH 系统提供了一种潜在的方法。