Abstract
In order to clarify mechanism of proton formation in SrCeO 3-based oxides at high temperature, equilibrium proton concentration was determined by thermogravimetric analysis using a large scale thermobalance. Solubility of water vapor in SrCe 0.95Yb 0.05O 3−α was determined under various partial pressures of water vapor at high temperatures. The solubility increased with partial pressure of water vapor and decreased with increasing temperature. From behavior of water vapor dissolution, proton formation could be deduced to the following equation. H 2 O+ O o ̈ ⤦2 H .+ O x o . The dependence of proton concentration in the oxides on partial pressure of water vapor and temperature were also studied. Proton mobility and its activation energy were calculated using proton concentration determined in this experiment.
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