Mass transfer effects on ZrO2 oxygen concentration cells exposed to non-equilibrium H2-O2 mixtures
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We report further studies of ZrO2 oxygen concentration cells exposed to non-equilibrium gas mixtures. Substantial shifts of cell voltage-(H2/O2) composition curves are produced by changes in the gas flow rate past the cell. At high flow rates, there is an abrupt voltage step at about 2.2 times the H2/O2 stoichiometric ratio. At low flow rates this voltage step occurs at stoichiometry. These findings are understood on the basis of mass transfer to a heterogeneous catalyst/electrode surface.
KeywordsMass Transfer High Flow Transfer Effect High Flow Rate Stoichiometric Ratio
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