Electrochemical Hydrogen Pump using a High Temperature Type Proton Conductor under Reduced Pressure

The electrochemical hydrogen pump properties of the CaZr0.9In0.1O3-α proton conductor were observed under reduced pressure condition in the cathode compartment for the recovery of hydrogen isotopes. The applied voltage between electrodes under reduced pressure condition reduced than that under atmospheric pressure condition, when the hydrogen pump performance was evaluated by direct current method. It is likely that the total pressure in the cathode compartment affects the overall electric resistance. From the impedance spectroscopy analysis, it was suggested that diffusion process in porous electrode was affected by reduced pressure condition. The hydrogen pump performance could be improved under the reduced pressure condition of around few kPa and the reduced pressure condition had an effect on the mass transfer process in the electrode.