Osmotic energy conversion and interfacial solar-thermal evaporation possess superiority in obtaining sustainable electricity and freshwater. Previous research has focused on single-function performance enhancement. In this study, an integrated bifunctional device is proposed for osmotic energy conversion and photothermal water evaporation, wherein energy conversion enhancement is realized by the synergetic driving of salinity and pressure gradients, as well as the promoted ion selectivity brought by thermal regulation. The integrated device generates clean water on the evaporation surface as a secondary product with an evaporation rate of 0.88 kg·m^–2·h^–1. In the integrated device, the “reversed” ionic Soret effect, which induces ion transport from the low-temperature to high-temperature side, is generated by thermal regulation because of the thermal selectivity enhancement effect. The osmotic power density reached 4.50 W·m^–2. Finite element simulations clarify that this integrated device improves osmotic power density by enhancing ion diffusion and fluid convection in membrane nanochannels.

中文翻译：

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通过盐度和压力梯度与热辅助的协同作用实现渗透能转换和光热水蒸发的双功能装置

渗透能转换和界面光热蒸发在获得可持续电力和淡水方面具有优势。以前的研究主要集中在单一功能的性能增强上。在这项研究中，提出了一种用于渗透能量转换和光热水蒸发的集成双功能装置，其中通过盐度和压力梯度的协同驱动以及热调节带来的促进离子选择性来实现能量转换增强。集成装置在蒸发表面生成洁净水作为二次产品，蒸发速率为0.88 kg·m ^–2 ·h ^–1。在集成器件中，由于热选择性增强效应，通过热调节产生“反向”离子索雷效应，诱导离子从低温侧传输到高温侧。渗透功率密度达到4.50 W·m ^–2。有限元模拟表明，这种集成装置通过增强膜纳米通道中的离子扩散和流体对流来提高渗透功率密度。