Inverse-L Shaped Evaporator Based on La1-xSrxMnO3 Perovskite with Efficient Salt Collection via Localized Salt Gradient

Abstract

Solar desalination offers a sustainable solution for freshwater production with minimal carbon emissions by utilizing solar energy. However, the efficiency of solar-vapor generation is often limited due to its high energy demands, resulting in low water evaporation rates under natural sunlight. To overcome this challenge, La-0.Sr-7(0).3MnO3, an oxide perovskite is introduced that acts as a highly efficient photothermal material. It effectively converts solar energy into heat by forming intra-band trap states, which facilitate non-radiative recombination of photoexcited electrons and holes, thereby enhancing heat release through thermalization. A key obstacle in solar desalination is salt accumulation, which can degrade material performance over time. To mitigate this, a novel device design is developed that enables one-directional fluid flow, establishing a salt gradient that pushes salt to the edges of the photothermal material, significantly reducing fouling and light shielding. By combining La-0.Sr-7(0).3MnO3 with this innovative design, an impressive solar evaporation rate of 3.40 kg m(-)2 h(-)(1) under one sun is achieved, while ensuring strong antifouling capabilities in complex environments. This work demonstrates a breakthrough approach to enhancing the efficiency and durability of solar desalination through advanced material engineering and smart design.