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The thermodynamic viability of yttria-stabilized zirconia pH sensors for high temperature aqueous solutions
Authors:Digby D. Macdonald  Samson Hettiarachchi  Stephen J. Lenhart
Affiliation:1. Chemistry Laboratory, SRI International, 94025, Menlo Park, CA
2. FORD Aerospace, Co., 94303, Mountain View, CA
Abstract:The thermodynamic viability of the yttria-stabilized zirconia sensor (YSZS) [H2O, H+/ZrO2(Y2O3)/HgO/Hg] for the measurement of pH in high temperature aqueous solutions is evaluated by measuring potentials for this electrode and a conventional hydrogen electrode (HE) against a common reference electrode in a variety of solutions [0.01m H3PO4, 1m Na2SO4, 0.01m B(OH)3+0.01m KOH, and 0.01m KOH] at temperatures from 298.15K (25°C) to 573.115K (300°C). In order to compare theoretical and experimental potentials for the cell

$$Pt/H_{2,}  H^ +  , H_2 O/ZrO_2 (Y_2 O_3 )/HgO/Hg (i.e.,HE/YSZS)$$
Keywords:Yttria-stabilized zirconia  pH measurement  thermodynamic viability  high temperature aqueous enviroment
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