A super dense type of ice can actually act like a solid-state sponge for storing hydrogen fuel.
April 2, 2026
Original Paper
Cryogenic stabilization of molecular hydrogen in dense cubic ice
arXiv · 2604.00907
The Takeaway
Hydrogen is notoriously difficult to contain, usually requiring high-pressure tanks or materials with physical holes. This study shows that ice crystals can trap hydrogen molecules inside a dense structure without any permanent porosity, creating a potential storage method using nothing more than water.
From the abstract
Hydrogen is widely regarded as a cornerstone of future low-carbon energy technologies, yet the lack of safe, efficient, and reversible solid-state storage materials remains a major barrier to its large-scale deployment. Although porous frameworks and metal hydrides have been extensively explored, far less is known about the ability of dense molecular solids to stabilize hydrogen at near-ambient pressure. Here we show that fully crystalline cubic ice, despite its non-porous nature, can retain mol