Abstract
The use of solar heat to produce steam holds great potential in terms of solving drinkable freshwater scarcity worldwide. However, the fabrication of low-cost, large-scale photothermal materials remains difficult; existing multi-step processes use toxic solvents. Here, a solvent-free and facile synthetic process is presented: we coat sulfur (S) with polypyrrole (PPY), then use PPY-coated S (S-PPY) as a photothermal layer for solar steam generation. We demonstrate an excellent solar steam evaporation rate (2.13 kg m-2h−1 at 1 Sun light intensity; efficiency 88.92 %). The use of inexpensive and abundant S as a substrate for PPY photothermal composites will find many energy-conversion applications as welll as water purification and desalination via solar steam generation.
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