A Cornell University-led collaboration has developed a low-cost method to produce carbon-free 'green' hydrogen via solar-powered electrolysis of seawater. The hybrid solar distillation-water electrolysis (HSD-WE) device currently produces 200 milliliters of hydrogen per hour with 12.6% energy efficiency directly from seawater under natural sunlight. The researchers project that within 15 years, the technology could reduce the cost of green hydrogen production to $1 per kilogram, a significant milestone in achieving net-zero emissions by 2050. Green hydrogen, produced by splitting deionized water molecules through electrolysis, has traditionally been expensive due to the high clean water consumption. The new technology leverages waste heat from photovoltaics to evaporate seawater, producing potable water as a valuable byproduct. The team envisions integrating the technology into solar farms to enhance the efficiency of PV panels and extend their lifespan, further promoting sustainable energy solutions. Overall, the innovative approach offers a promising step towards overcoming the challenges of energy and water scarcity while advancing towards a greener future.