BTW- 304 S/Steel seems reluctant to accept much hydrogen, at least at the temperature level in the tank. I know you can hot gas load it, but electrolysis only yields around 10mV.
Watched the Mission Hydrogen webinar this afternoon. Quite interesting, but nothing particularly groundbreaking. The presenter did seem to be worrying some of the Hydrogen equipment suppliers, though
As usual, there was an emphasis on all the various theories being incomplete - with plenty of mysteries left.
One thing I noticed was that encouraging a passivation/oxidation layer is being seen as a convenient way to reduce the unwanted migration of hydrogen into the surface of some metals. Maybe the effectiveness of natural surface passivation, as a hydrogen barrier, is better than implied by the normal literature.
So - perhaps a more aggressive oxide removal method is required, for some of the more "reluctant" materials, before trying to load them with hydrogen.