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- Publisher
- Springer Journals
- Copyright
- Copyright © 2010 by Springer-Verlag
- Subject
- Chemistry; Condensed Matter Physics; Optical and Electronic Materials; Renewable and Green Energy; Electrochemistry
- ISSN
- 0947-7047
- eISSN
- 1862-0760
- DOI
- 10.1007/s11581-010-0466-6
- Publisher site
- See Article on Publisher Site
Abstract
The following hydrogen and oxygen concentration cells using the oxide protonic conductors, $$ {\text{CaZ}}{{\text{r}}_{0.98}}{\text{I}}{{\text{n}}_{0.02}}{{\text{O}}_{3 - \delta }} $$ and $$ {\text{CaZ}}{{\text{r}}_{0.{9}}}{\text{I}}{{\text{n}}_{0.{1}}}{{\text{O}}_{{3} - \delta }} $$ , as the solid electrolyte were constructed, and their polarization behavior was studied, $$ \left( {{\text{reversible}}: - } \right){\text{ Pt}},{{\text{H}}_2}{ + }{{\text{H}}_2}{\text{O}}/{\text{CaZ}}{{\text{r}}_{1 - y}}{\text{I}}{{\text{n}}_y}{{\text{O}}_{3 - \delta }}\left( {y = 0.02{\text{ or }}0.1} \right)/{\text{Ar}}\left( { + {{\text{H}}_2} + {{\text{O}}_2}} \right),{\text{ Pt}}\left( { + :{\text{irreversible}}} \right) $$ The characteristics between applied voltages and external currents (V–I characteristics) in a DC polarization state were studied at 1,173 to 1,273 K in various atmospheres at the side of the reversible electrode. From the obtained atmosphere dependence of the steady-state current, the solubilities of protons in In-doped CaZrO3 were evaluated based on the appropriate defect model. The solubility of protons was found to decrease with increasing indium concentration in the matrix. The standard free energy of proton dissolution into In-doped CaZrO3 of the composition $$ {\text{CaZ}}{{\text{r}}_{0.98}}{\text{I}}{{\text{n}}_{0.02}}{{\text{O}}_{3 - \delta }} $$ was estimated to be as follows: $$ \begin{array}{*{20}{c}} {{{\text{H}}_2}{\text{O}} + {\text{V}}_{\text{O}}^{ \cdot \cdot } + {\text{O}}_{\text{O}}^\times = 2{\text{OH}}_{\text{O}}^\cdot } \\ {\begin{array}{*{20}{c}} \hfill {\Delta {G^\circ }({\text{kJ}}/{\text{mol}}) = - 194({\text{kJ}}/{\text{mol}}) + 0.166({\text{kJ}}/{\text{molK}})T} \\ \hfill {\pm 5{\text{kJ}}/{\text{mol}}} \\ \end{array} } \\ \end{array} $$ and that of the composition $$ {\hbox{CaZ}}{{\hbox{r}}_{0.9}}{\hbox{I}}{{\hbox{n}}_{0.1}}{{\hbox{O}}_{3 - \delta }} $$ could not be determined accurately.
Journal
Ionics – Springer Journals
Published: Aug 25, 2010