The solar-driven interface evaporation (SIE) is considered as a potential approach for desalinating seawater and obtaining clean water. However, most reported SIE systems can hardly handle with the accumulating salt crystals. Herein, a new type of SIE device based on surface-carbonized rattan (C-rattan) is presented for high-performance and salt-free desalination. Owing to the hierarchical channels in each vascular bundle and the natural gradient structure of the rattan stem, the C-rattan evaporator can spontaneously generate salinity gradients between and within the vascular bundles that form a synergistic effect to prompt salt exchange and high-salinity solution reflow. In addition to a high water evaporation rate of 1.47 kg m⁻² h⁻¹ and an efficiency of 90.4% under 1 sun illumination, the C-rattan also presents an outstanding salt resistance ability and an evaporation rate of 1.17 kg m⁻² h⁻¹ even for the high-salinity brines (20 wt% NaCl solution). Additionally, the C-rattan possesses the self-cleaning ability that enables it to clear off extra added salt during the solar desalination process. Considering its low-cost and sustainable raw materials, simple preparation procedures, long-term salt resistance ability and self-cleaning capacity, the C-rattan-based SIE device holds a great promise for people living in developing regions to obtain drinkable water from seawater or high-salinity brine.

太阳能驱动的界面蒸发（SIE）被认为是海水淡化和获得清洁水的潜在方法。然而，大多数报道的 SIE 系统很难处理累积的盐晶体。在此，提出了一种基于表面碳化藤（C-藤）的新型 SIE 装置，用于高性能和无盐脱盐。由于每个维管束中的分层通道和藤茎的自然梯度结构，C-藤蒸发器可以自发地在维管束之间和维管束内产生盐度梯度，形成协同作用，促进盐交换和高盐溶液回流. 除了 1.47 kg m ^-2 h ^{-1的高水分蒸发率}在 1 次阳光照射下，C-藤的效率为 90.4%，即使在高盐度盐水（20 wt% NaCl 溶液）下，C-藤也表现出出色的抗盐能力和 1.17 kg m ^-2 h ^{-1的蒸发速率。}此外，C-藤具有自清洁能力，使其能够在太阳能淡化过程中清除额外添加的盐分。考虑到其低成本和可持续的原材料、简单的制备程序、长期的耐盐能力和自清洁能力，基于 C-藤的 SIE 装置为生活在发展中地区的人们从海水中获取饮用水提供了巨大的希望或高盐度的盐水。