Interfacial evaporation is one of the most promising technologies for harvesting solar energy to generate steam. Here, we report a solar interfacial evaporator with excellent self-cleaning property via a well-designed artificial channel array in the raw wood substrate. This device shows high light absorption nearly 90% and high solar-to-vapor conversion efficiency of ~88.2% of pure water under one sun irradiation. In addition, due to the existence of two different channels on the device surface: man-made millimetre-sized cutting channels and micro-channels formed by natural growth, the deposition of salt was reduced and its long-term stability in the NaCl solution (over 80 h of continuous operation) was increased. Based on the above conditions, the PCW-7 × 7 still maintains its efficiency at about 80.0% and 73.4% at 1 kW m^-2 irradiation in the different simulated seawater with different salinities (3.5 and 20 wt%).

界面蒸发是收集太阳能以产生蒸汽的最有前途的技术之一。在这里，我们通过在原木基材中精心设计的人工通道阵列报告了一种具有优异自清洁性能的太阳能界面蒸发器。该装置在一次阳光照射下显示出接近 90% 的高光吸收率和约 88.2% 的纯水的高太阳能到蒸汽转换效率。此外，由于器件表面存在两种不同的通道：人造毫米级切割通道和自然生长形成的微通道，减少了盐分的沉积，使其在NaCl溶液中长期稳定（超过 80 小时的连续操作）增加。基于上述条件，PCW-7×7在1kW·m时仍保持在80.0%左右和73.4%左右的效率^-2辐照在不同盐度（3.5 和 20 wt%）的不同模拟海水中。