Abstract Interfacial solar steam generation is an eco-friend and energy-efficient way of harvesting solar energy for desalination and wastewater treatment. For the solar steam generation, the primary focus is to design new materials that are fully sunlight absorption, fast photothermal conversion and low heat emissivity. Here, a novel hollow copper sulfide (CuS) nanocubes with concave surface is used for rapid and efficient solar steam generation through the micro thermal management. Interestingly, the emissivity of CuS foam is as low as 0.64, whose absorption is more than 97% and strongly dependents on the structure and morphology. The unique concave structure of hollow CuS can trap the sunlight by reabsorption as well as recover radiative and convective heat loss. As a result, the CuS based generator exhibits a high evaporation efficiency of 91.5% under one sun illumination. Furthermore, the device can maintain a stable performance of solar steam generation during the cyclic seawater desalination. The novel structure design based on the micro thermal management offers a new insight into the future development of highly efficient solar steam generation.

中文翻译：

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用于高效太阳能蒸汽产生的低发射率中空硫化铜纳米立方体的合成

摘要 界面太阳能蒸汽发电是一种环保、节能的太阳能收集方式，用于海水淡化和废水处理。对于太阳能蒸汽发电，主要重点是设计完全吸收阳光、快速光热转换和低热发射率的新材料。在这里，一种具有凹面的新型空心硫化铜 (CuS) 纳米立方体用于通过微热管理快速有效地产生太阳能蒸汽。有趣的是，CuS 泡沫的发射率低至 0.64，其吸收率超过 97%，并且强烈依赖于结构和形态。空心CuS独特的凹面结构可以通过重吸收来捕获阳光，并恢复辐射和对流热损失。因此，基于 CuS 的发生器表现出 91 的高蒸发效率。一次阳光照射下 5%。此外，该装置可以在循环海水淡化过程中保持太阳能蒸汽产生的稳定性能。基于微热管理的新型结构设计为高效太阳能蒸汽发电的未来发展提供了新的见解。