Stanford Solar-Powered Hydrogel Produces Drinking Water from Air at 1 Cent Per Liter
Tags Research · Hardware
Stanford researchers have developed a polyacrylamide-lithium chloride hydrogel with anti-corrosion coating that harvests potable water from atmospheric moisture using only solar heat. The gel lasts over 8 months and 190+ water-harvesting cycles, producing up to 1.7 L/m²/day at an estimated cost of ~1 cent per liter. The key innovation is an anti-corrosion coating on the metal casing that prevents gel degradation. Published in Nature Communications (DOI: 10.1038/s41467-026-71987-8).
Technical significance
Atmospheric water harvesting has been pursued for over a decade, but degradation of hydrogels in ~30 cycles has been the primary barrier. The anti-corrosion coating breakthrough extends lifespan to 190+ cycles and 8+ months, crossing the threshold for commercial viability. At 1 cent per liter, this is competitive with tap water. For the tech industry, water-intensive operations like semiconductor fabrication could benefit.