To elucidate the mechanism of the electrode reaction at the interface of H2-H20 porous Pt/stabilized zirconia, measurements were made on the electrode interface conductivity, ~, and the steady-state polarization current, I, as a function of H2 partial pressure, P~2, and H20 partial pressure, PH20, up to 800~ The rate of the electrode reaction at 700 to 800~ in H2-H20 atmospheres is faster than that in CO-CO2 and slower than that in 02 rich atmospheres by 1 to 2 orders of magnitude. The rate-determining reaction process was the exchange of adsorbed OH radicals between the Pt-and the stabilized zirconia-surface at the triple-phase boundary (TPB) of gas/Pt/stabilized zirconia. When the oxygen activity, a0, ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.122.253.228 Downloaded on 2015-05-25 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.122.253.228 Downloaded on 2015-05-25 to IP

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