[alloysteel]

The chemistry is not clear to me. First inject hydrogen at 400 degrees Centigrade into a retort filled with iron oxide (Fe2O3), forming free metallic iron and water, what steps are taken to reverse this reaction? More heat? Let the iron rust to again form ferric oxide and free hydrogen? How fast does this proceed? Is the hydrogen produced at a rapid enough pace to be a reliable power source?

[Jonty30]

What it sounds like to me is that the steam decomposes water and the free oxygen remixes with the iron to become Iron oxide again.

[IndispensableDestiny]

I read the report. Outside heat comes to play twice. First, the reactor holding the iron oxide (rust) is kept at 400 C. Later, steam must be made to oxide the iron and liberate the hydrogen. The reports claims about 11 percent thermal efficiency, which they wave off with plans of better insulation.

Not impressed if the goal is to store, not make, hydrogen.

[cpdiii]

The chemistry is not clear to me. First inject hydrogen at 400 degrees Centigrade into a retort filled with iron oxide (Fe2O3), forming free metallic iron and water, what steps are taken to reverse this reaction? More heat? Let the iron rust to again form ferric oxide and free hydrogen? How fast does this proceed? Is the hydrogen produced at a rapid enough pace to be a reliable power source?

Exactly, I was about to post the same thing but then remembered the real equation shown below:

enthalpy + the magic = more enthalpy and entropy is not a factor. LOL

Gibbs Free Energy will not be denied.