Solar water evaporation shows great promise in the utilization of sunlight resources. However, currently available evaporators suffer from poor mechanical properties, easy leakage and failure of heat conversion materials, and single utilization pattern limit the equipment can not be widely used. In this study, a wood composite with good flexibility, efficient photothermal conversion was prepared using delignified wood (DW), polymerizable deep eutectic solvent (PDES) and TiCT (MXene) nanosheets. DW was a hydrophilic substrate to provide water transport channels. The MXene nanosheets were uniformly dispersed in the DW matrix through hydrogen bonding for efficient light absorption and photothermal conversion, while PDES provided flexibility to the material, allowing it to be shaped as desired. Meanwhile, the addition of PDES not only effectively prevents the oxidation of MXene nanosheets, but also helps MXene to be encapsulated in the composite material and provides some flame retardant effect. In addition, through the combined use of semiconductor thermoelectric power modules (SP modules), waste heat can be directly used for power generation. Under 1 solar irradiation, the water evaporation rate could reach 1.59 Kg/m/h, the power density of photothermal power generation was 0.71 W m, and the photothermal conversion efficiency is 95.24%. The device can operate for a long time in extreme environments, providing fresh water and electricity to resource-constrained areas.

中文翻译：

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用于太阳能水蒸发和余热发电的柔性木基复合材料

太阳能水蒸发在太阳能资源的利用方面显示出巨大的前景。然而，现有蒸发器机械性能较差，热转换材料容易泄漏和失效，且使用方式单一，限制了设备的广泛应用。在这项研究中，利用脱木质素木材（DW）、可聚合低共熔溶剂（PDES）和TiCT（MXene）纳米片制备了具有良好柔韧性、高效光热转换的木质复合材料。 DW 是一种亲水基质，可提供水传输通道。 MXene 纳米片通过氢键均匀分散在 DW 基质中，以实现高效的光吸收和光热转换，而 PDES 为材料提供了灵活性，使其能够根据需要成型。同时，PDES的添加不仅可以有效防止MXene纳米片的氧化，而且有助于MXene被封装在复合材料中，并提供一定的阻燃效果。此外，通过半导体热电发电模块（SP模块）的组合使用，废热可直接用于发电。在1次太阳辐照下，水蒸发速率可达1.59 Kg/m3/h，光热发电功率密度为0.71 W m，光热转换效率为95.24%。该设备可在极端环境下长时间运行，为资源紧张地区提供淡水和电力。