Hydrogen breakthrough: New liquid stores clean fuel at room temperature

Researchers at EPFL and Kyoto University have developed the first hydride-based deep eutectic solvent (DES), a hydrogen-rich liquid stable at room temperature that could revolutionize hydrogen storage. This liquid is created by mixing ammonia borane and tetrabutylammonium borohydride in specific ratios (50%-80% ammonia borane), resulting in a transparent, stable liquid containing up to 6.9% hydrogen by weight—surpassing the US Department of Energy’s 2025 hydrogen storage target. The DES remains liquid due to strong hydrogen bonding disrupting the crystalline structure of the individual components, and it does not crystallize even when cooled below −50°C, instead undergoing a glass transition. This new hydrogen storage medium offers significant advantages over existing methods, which rely on high-pressure gas compression or cryogenic cooling, both energy-intensive and cumbersome. The liquid releases pure hydrogen gas at a relatively low temperature of 60°C, requiring less energy than many solid-state storage materials, and only the