Hydrogen storage, supply chain, and infrastructure challenges have to be overcome before hydrogen-powered aircraft become a reality.
Hydrogen has three times more energy density than jet fuel. Hydrogen-powered engines do not produce carbon dioxide and nitrogen oxide. Liquid hydrogen can be used for the combustion process in turbine engines.
Alternatively, electrical energy created through hydrogen fuel cells provides power to the engines. Despite hydrogen being a promising alternative to jet fuel, the most significant challenges remain.