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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

Institution:

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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