MIT engineers have discovered a sustainable method to produce hydrogen by mixing pure aluminum with seawater, a process enhanced by the addition of caffeine. The simple reaction generates hydrogen, a clean energy source, without carbon emissions. By pretreating aluminum pellets with a rare-metal alloy, the team achieved efficient hydrogen production from seawater. Adding caffeine accelerated the reaction significantly. The researchers are developing a reactor for marine vehicles that can produce hydrogen on demand using recycled aluminum pellets and seawater. The study's findings offer a promising solution for green energy in maritime applications. By utilizing seawater as a hydrogen source and reusing gallium-indium alloy, the process aims to be cost-effective and sustainable. This innovative approach could pave the way for clean energy production without the need to transport hydrogen gas, making it a safer and more efficient alternative.