Abstract
A novel type of a selectively hydrogen-permeable membrane is presented. The membrane consists of a poreless Pd-Ag film with a thickness of about 1μm on a nickel-sieve structure serving as a porous support material. A palladinated and additionally platinated membrane has been tested as a hydrogen anode in 10 M KOH in the range of 55 and 106 °C. It has been found that the anodic current density is limited by the kinetics of gas-side surface reactions of hydrogen and/or by the hindered transition at the interfaces between the catalytic palladium layers and the Pd−Ag film. On the electrolyte side, the surface diffusion on the additionally deposited platinum turned out to be important. At an overpotential of 100 mV and at 120 °C, a current density of about 0.5 A/cm2 has been been estimated for pure hydrogen and normal pressure.
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