The Army Research Lab in Aberdeen,MD,also experimented and patented some applications for using Aluminium for H2 production. On closer review it is not feasible for large scale. Besides: producing Aluminium is extremely energy and CO2 intensive
Lots of things that are CO2 intensive now will not be in the future. We already shut down the majority of the coal power plants and replaced them with natural gas, and we'll then replace natural gas with solar and wind.
