Abstract
Transient phenomena of electrochemical hydrogen pumps, permeation of hydrogen on passing a direct current through a proton-conducting electrolyte, were investigated. Variations of proton transport in electrochemical hydrogen permeation by changing the anode gas were investigated potentiostatically at 900°C using a SrCe 0.95Yb 0.05O 3− α proton-conducting solid electrolyte. Changes in direct current and charge carriers were examined on changing the anode gas from Ar to H 2 and back while keeping Ar as the cathode gas. In another variation of the anode gas with the two hydrogen isotopes, H 2 and D 2, the time dependence of the evolution of hydrogen isotope species at the cathode was analyzed to estimate the mobilities of protons and deuterons in the electrolyte.
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