Biomass-based photothermal materials, being fabricated based on agricultural waste, are widely applied in solar steam generation (SSG) recently. The evaporation rate of the SSG systems while utilizing these materials can reach 1.4–1.6 kg m^-2 h^-1 under 1 sun condition. In this study, a coconut husk (CH), a common agricultural waste, was utilized to fabricate the photothermal material that can be applied in the SSG system. CH consists of coconut fibers containing many vascular bundles with 10-20 μm diameter and cocopeat that has honeycomb-like structure. After treating CH with tannic acid and Fe (III) solution, the coordination of phenolic compounds with Fe³⁺ in the CH is formed. The resulting CH-TA-Fe³⁺ (CHP) material demonstrated significant advantages such as high light absorption, low thermal conductivity, ultra-fast water transportation, low moisture enthalpy, and self-cleaning properties. The CHP-based SSG system possessed high seawater evaporation rate (1.83 kg m^-2 h^-1) and evaporation efficiency (73.2%), which are comparable to those in the previous studies on biomass material based SSG systems. Especially, the CHP-based SSG system exhibited excellent structural stability that ensures their long-term performance in the seawater desalination. With simple fabrication process, affordable price, and eco-friendly materials, the CHP proves great potential in seawater desalination application.

基于农业废弃物制造的生物质光热材料最近被广泛应用于太阳能蒸汽发电（SSG）。SSG 系统在利用这些材料时的蒸发率在 1 日照条件下可达到 1.4–1.6 kg m ^-2  h ^-1。在这项研究中，一种常见的农业废物椰子壳 (CH) 被用来制造可应用于 SSG 系统的光热材料。CH由含有许多直径为10-20μm的维管束的椰子纤维和具有蜂窝状结构的椰子纤维组成。CH用单宁酸和Fe(III)溶液处理后，酚类化合物与CH中的Fe ³⁺形成配位。生成的 CH-TA-Fe ³⁺(CHP) 材料表现出显着的优势，如高光吸收、低热导率、超快水传输、低湿焓和自清洁性能。基于CHP的SSG系统具有较高的海水蒸发率（1.83 kg m ^-2  h ^-1）和蒸发效率（73.2%），与之前基于生物质材料的SSG系统的研究相当。特别是，基于 CHP 的 SSG 系统表现出优异的结构稳定性，确保其在海水淡化中的长期性能。凭借简单的制造工艺、实惠的价格和环保材料，热电联产在海水淡化应用中具有巨大潜力。