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<p>Sorption-based atmospheric water harvesting (AWH) is a promising approach to relieve water scarcity in off-grid arid regions. Practical deployment remains limited by slow sorption kinetics caused by diffusion resistance and by intermittent desorption under diurnal and weather-dependent solar input. Here we report a hybrid solar and phase-change-material (PCM) hygroscopic wood composite (PHW) that integrates a water-sorption zone and an energy-management zone. The sorption zone uses a LiCl-embedded wood sponge with vertically aligned, multilayer channels to accelerate mass transport and shorten the time to equilibrium. The energy-management zone employs a PCM-based photothermal hydrogel to enhance solar-to-thermal conversion and store heat for sustained desorption. The PHW achieves a water uptake capacity of 0.59–3.03 g g<sup>-1</sup> at 15-90% RH and reaches equilibrium within 360 min. The PCM hydrogel provides a heat-storage enthalpy of 155.51 J g<sup>-1</sup> and an energy-conversion efficiency of 90.80%, enabling continuous water release under weak light and in darkness. In outdoor tests across cool winter and hot summer conditions and in different climate regions, a large-scale PHW array delivers a daily water yield of 0.96–1.72 L<sub>water</sub> kg<sub>sorbent</sub><sup>-1</sup> day<sup>-1</sup> via continuous multi-cycle sorption–desorption. This hybrid sorption and thermal-management strategy advances all-weather AWH and improves real-world applicability.</p>

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Hygroscopic wood sponge with dual phase change function for enhanced all-weather atmospheric water harvesting

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月7日

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  • Xinyao Ji,
  • He Shan,
  • Jiazuo Zhou,
  • Chengyu Wang,
  • Yifan Liu,
  • Fangmiao Wang,
  • Lei Qiao,
  • Zimeng Liu,
  • Meichen Li,
  • Kai Zhang,
  • Yudong Li,
  • Wenbo Zhang,
  • Haiyue Yang,
  • Ruzhu Wang

摘要

Sorption-based atmospheric water harvesting (AWH) is a promising approach to relieve water scarcity in off-grid arid regions. Practical deployment remains limited by slow sorption kinetics caused by diffusion resistance and by intermittent desorption under diurnal and weather-dependent solar input. Here we report a hybrid solar and phase-change-material (PCM) hygroscopic wood composite (PHW) that integrates a water-sorption zone and an energy-management zone. The sorption zone uses a LiCl-embedded wood sponge with vertically aligned, multilayer channels to accelerate mass transport and shorten the time to equilibrium. The energy-management zone employs a PCM-based photothermal hydrogel to enhance solar-to-thermal conversion and store heat for sustained desorption. The PHW achieves a water uptake capacity of 0.59–3.03 g g-1 at 15-90% RH and reaches equilibrium within 360 min. The PCM hydrogel provides a heat-storage enthalpy of 155.51 J g-1 and an energy-conversion efficiency of 90.80%, enabling continuous water release under weak light and in darkness. In outdoor tests across cool winter and hot summer conditions and in different climate regions, a large-scale PHW array delivers a daily water yield of 0.96–1.72 Lwater kgsorbent-1 day-1 via continuous multi-cycle sorption–desorption. This hybrid sorption and thermal-management strategy advances all-weather AWH and improves real-world applicability.