▎ 摘　　要

Materials for the efficient use of green, renewable and clean solar energy have aroused general interest for quite a long time. In this work, simple and inexpensive double-layered structural photothermal conversion materials were prepared for the photothermal evaporation process. Partially reduced graphene oxide (prGO) was prepared by a controlled hydrothermal reduction of graphene oxide and was employed in the construction of double-layered photothermal conversion materials. The chemical features of prGO, the light absorbance and the properties of the double-layered materials were characterized, and the hydrophilicity, photothermal properties and water evaporation performance of the double-layered materials were analyzed. The results showed that prGO was easily obtained from GO through the hydrothermal partial reduction process. After the hydrothermal treatment, the surface topography of prGO was found to be rough with openings and facilitated light scattering and absorption. The C/O atomic ratio in the obtained prGO increased compared with that of GO, but the highly hydrophilic functional groups were still present in the prGO. The hydrophilicity of the prGO layer enhanced the wettability of the interface and facilitated the escape of vapor from the thin water film. The fabricated prGO had strong light absorption in the spectral range from 280 nm to 2500 nm, and the absorbance could be as high as 95%. Under a simulated solar illumination of 1 kW .m(-2), the evaporation efficiency values of EPE-prGO, Sponge-prGO and Wood-prGO were as high as 81%, 83% and 91%, respectively, and the temperature on the surfaces of the prGO-coated materials rose rapidly and reached the maximum value after approximately 6 minutes. The water evaporation of these materials was found to respond immediately to light irradiation. The energy efficiency and the rate of evaporation were greatly improved by using the materials produced in this work.