A team led by Cornell University has developed a groundbreaking 10x10 cm prototype device, the hybrid solar distillation-water electrolysis (HSD-WE), that efficiently produces green hydrogen through solar-powered electrolysis of seawater. This innovative technology not only generates carbon-free hydrogen but also produces potable water as a byproduct. The device boasts an impressive 12.6% energy efficiency and can produce 200 milliliters of hydrogen per hour. The device addresses the challenge of high water consumption in traditional hydrogen production methods by utilizing waste heat from solar panels to evaporate seawater. The resulting clean water vapor is then converted into hydrogen and oxygen through electrolysis. The cost of producing green hydrogen, currently at $10 per kilogram, is projected to potentially decrease to $1 per kilogram within 15 years using this technology. Beyond cost reduction and green hydrogen production, the technology holds further promise. Integrating it into solar farms could enhance the efficiency of photovoltaic panels by cooling them, thereby extending their lifespan. The research team aims to pave the way for sustainable energy production and water supply by leveraging the abundance of sunlight and seawater. This innovative approach not only offers a solution to the bottleneck in green hydrogen production but also provides additional benefits like clean water production and potential for large-scale adoption in the future.