Johnson Thermoelectric Energy Converter(en.wikipedia.org)
en.wikipedia.org
Johnson Thermoelectric Energy Converter
https://en.wikipedia.org/wiki/Johnson_thermoelectric_energy_converter
https://en.wikipedia.org/wiki/Johnson_thermoelectric_energy_converter
Any system that only works with Hydrogen is automatically hand-wavy because working with hydrogen is a giant pain in the ass.
But it sounds like instead of just a regular compressor cycle, the hydrogen gets forced through a fuel cell kind of membrane and split into protons and electrons? I think my chemistry and physics classes petered out somewhere around there. Higher potential energy in the electrons on the input side than on the output end?