Abstract
In this paper, RGO and GTube membranes are prepared to be used as absorbers in solar-driven interfacial evaporation. The GTube membrane could gain evaporation rate of 1.44 kg·m−2·h−1 under 1200 W·m−2, which is 20% larger than the RGO membrane. To explore the mechanism, the SEM and TEM images, water contact angles are tested. It is revealing that the GTube membrane forms much more pores for steam diffusion. The GTube membrane shows 97% of optical absorption within wavelength ranges from 250 to 2200 nm, while the RGO membrane is lower than 80%, revealing the GTube membrane could gather most of the solar radiation. Last, the permeability coefficient of RGO and GTube membranes are calculated by CFD model. The permeability coefficient of GTube membrane is 2-fold larger than the RGO membrane. This work provides a sight to construct the hollow carbon materials for improving optical absorption and permeability coefficient in solar-driven interfacial evaporation.
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