DOI: 10.1038/s41560-025-01811-yA team of researchers at DTU may have cracked one of the toughest nuts in sustainable energy: how to make fuel cells light and powerful enough for aerospace applications. The same has been true for fuel cells, mostly confined to flat, heavy stacks that rely on metal parts for sealing and connectivity. "Currently, using electricity-based energy conversion, such as batteries and fuel cells, doesn't make sense for aerospace applications. There are many other reasons why the new fuel cells from the team of DTU scientists may be a game-changer. The fuel cells held up impressively, showing no signs of structural failure or layers separating," says Esposito, corresponding author.