“…This is a new technology that was developed for fuel cells and is being considered for fusion applications [18,19]. Doped perovskites can be configured as hydrogen pumps [20,21,22,23] and can easily be made by sintering stoichiometric oxides [24,25,26,27]. However, because of the novelty, the technology is not as well developed as technologies for metal-coated membranes.…”