Abstract Solar steam generation assisted by photothermal materials has attracted extensive attention due to its advantages of excellent evaporation rate and high photothermal conversion efficiency. In this work, we report a simple method by employment of halloysite (Hal) nanotubes (HNT) and graphene oxide (GO) as raw materials to produce efficient solar photothermal materials (named as GO-HNT). The as-prepared GO-HNT has rich porosity, excellent 90% light absorption and good thermal insulation performance (thermal conductivity 0.162 W m−1 K−1). Based on these characteristics, GO-HNT can be used as a promising solar receiver. Correspondingly, the solar energy conversion efficiency of the GO-HNT solar receiver was measured to be 83.67%, 77.17% and 77.05% respectively under 1 sun, 2 sun and 3 sun irradiations. As a 1D nanocrystalline clay mineral, HNT have great advantages of environmentally friendly, cost-efficient and commercial availability with abundant reserves. In combination with its simple and scalable manufacture method, this GO-HNT-based solar receiver may hold great potentials for a broad range of applications, such as seawater desalination, distillation, sterilization, sewage treatment, etc.

中文翻译：

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基于埃洛石纳米管的多孔结构作为高效太阳能蒸汽产生的光热材料

摘要 光热材料辅助太阳能蒸汽产生以其优异的蒸发速率和高光热转换效率等优点受到广泛关注。在这项工作中，我们报告了一种利用埃洛石 (Hal) 纳米管 (HNT) 和氧化石墨烯 (GO) 作为原材料生产高效太阳能光热材料（命名为 GO-HNT）的简单方法。所制备的 GO-HNT 具有丰富的孔隙率、优异的 90% 光吸收率和良好的隔热性能（导热系数 0.162 W m-1 K-1）。基于这些特性，GO-HNT 可以作为一种很有前途的太阳能接收器。相应地，GO-HNT太阳能接收器在1个太阳、2个太阳和3个太阳照射下的太阳能转换效率分别为83.67%、77.17%和77.05%。作为一维纳米晶粘土矿物，HNT具有环境友好、成本效益好、储量丰富的商业化优势。结合其简单且可扩展的制造方法，这种基于 GO-HNT 的太阳能接收器可能具有广泛的应用潜力，如海水淡化、蒸馏、杀菌、污水处理等。