HighEfficiency Solar Membranes Structurally Designedwith 3D Core–2D Shell SiO2@Amino-Carbon Hybrid AdvancedComposite for Facile Steam Generation
2020
Steam
generation through efficient utilization of solar energy
is a promising technology in addressing the challenge of global freshwater
shortage and water pollution. One of the biggest hurdles for traditional
photothermal membranes to function continuously in a high temperature,
high salt, and corrosive environment has been attributed to their
rapid decline of mechanical properties. In this work, a highly efficient
solar-driven interfacial water evaporation system has been developed
via a polydopamine/carbon/silicon (PCS) composite membrane supported
by a floating insulation foam substrate. A 3.1 fold increase in the
water vaporization rate was recorded compared with the pure water
system. The 2D-carbon nanolayer on the surface was successfully prepared
by carbonizing low-cost linear polyethylene with a glass fiber (GF)
membrane as the substrate, and then the carbon membrane was modified
with dopamine to control water transport on the carbon coating and
within the glass fiber. The PCS membrane has a high efficiency for
solar steam generation owing to high optical absorption and has excellent
solar thermal conversion capability. The evaporation rate and solar
thermal conversion efficiency of the PCS membrane under simulated
sunlight irradiation with 1 sun (1 kW·m–2)
are 1.39 kg·m–2·h–1 and
80.4% respectively, which are significantly higher compared to GF
membrane, carbon/silicon (CS) membrane, and pure water without a photothermal
membrane. The water evaporation system retained high efficiency after
20 cycles under simulated sunlight irradiation of 1 sun. This study
provides critical insight on the design and fabrication of a highly
efficient and durable evaporation system.
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