Dual‐Plasmonic Ti3C2Tx/CuSe 2D/2D Solar Absorber and a Hydrophilic Device for Efficient Solar‐Driven Water Collection

Solar water evaporation is an emerging technology for drinkable water generation, while it remains a challenge to develop materials and device for efficient water evaporation and collection. Herein, dual‐plasmonic Ti 3 C 2 T x /CuSe two‐dimensional (2D)/2D hybrids are prepared for high‐efficiency solar water evaporation and a hydrophilic device is designed for efficient water collection. The Ti 3 C 2 T x /CuSe hybrids, which monocrystalline CuSe ultrathin nanosheets are chemically bonded with Ti 3 C 2 T x nanosheets, show efficient photothermal conversion owing to the plasmon‐coupling‐induced strong light absorption and fast charge transfer in the 2D/2D interface. By transferring the hybrids on a cotton piece, the Ti 3 C 2 T x /CuSe membrane displays over 95% of solar light absorption, a stable evaporation rate of 1.893 kg m −2 h −1 , and solar‐to‐vapor efficiency of 99.13% under one‐sun irradiation. The membrane can also treat water with more than 20 wt% salinity due to the rich microchannel for ion diffusion. Furthermore, a water evaporation device, which the cambered roof is painted with hydrophilic SiO 2 , is designed for efficient water collection. The treated roof can efficiently reduce the optical loss and transfer the vapor condensation, leading to a high average freshwater generation of 16.4 kg m −2 in a daily (10 h) natural light irradiation, much higher than other reported devices.