Abstract Using optical absorption materials to heat localized water gaining water steam is a highly efficient way of solar energy utilization. Here, we introduced a new solar absorber of modified graphene aerogel (MGA) prepared by one-step hydrothermal method and oxygen plasma treatment for rapid and efficient solar steam generation. The obtained MGA possesses interconnected 3D porous networks formed by randomly construction of reduced graphene oxide (rGO) sheets and hydrophilic surface due to effective oxygen implant by oxygen plasma. Furthermore, under one sun illumination, MGA exhibited a high evaporation efficiency of 76.9%, which is not only due to the intrinsic property of rGO with excellent light absorption but also attributed to the particular structural merits of MGA—hydrophilic surface for water supplying and connected networks for steam escaping as well as porous matrix with low thermal conductivity. The cyclic tests confirmed that MGA still maintained a stable performance of solar steam generation even when it repeated multiple times. This new assembly demonstrated here is efficient and reusable for applications in rapid solar seawater desalination and wastewater treatment in remote area.

中文翻译：

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氧等离子体处理的石墨烯气凝胶作为太阳能吸收剂，用于快速高效的太阳能蒸汽产生

摘要 利用光吸收材料加热局部取水蒸汽是一种高效的太阳能利用方式。在这里，我们介绍了一种通过一步水热法和氧等离子体处理制备的改性石墨烯气凝胶 (MGA) 的新型太阳能吸收器，用于快速有效地产生太阳能蒸汽。获得的 MGA 具有互连的 3D 多孔网络，由于氧等离子体的有效氧注入，由还原氧化石墨烯 (rGO) 片和亲水表面的随机构造形成。此外，在一次阳光照射下，MGA 表现出高达 76.9% 的蒸发效率，这不仅是由于 rGO 具有优异的光吸收性的固有特性，而且还归因于 MGA 的特殊结构优点——用于供水的亲水表面和用于蒸汽逸出的连接网络以及具有低热导率的多孔基质。循环测试证实，即使多次重复，MGA仍保持稳定的太阳能蒸汽发电性能。此处展示的这种新组件高效且可重复使用，可用于偏远地区的快速太阳能海水淡化和废水处理。