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Solid state systems for the potentiometric determination of CO(2).
H H Möbius1, P Shuk, W Zastrow
1Institut für Physikalische Chemie, Universität Greifswald, Soldtmannstrasse 23, D-17489, Greifswald, Germany.
Analytical and Bioanalytical Chemistry
|September 1, 1996
Summary
This study explores solid-state sensors for determining carbon dioxide (CO2) potentiometrically. Researchers achieved stable signals using specific galvanic cells, aligning well with thermodynamic calculations for CO2 sensing.
Area of Science:
- Solid-state chemistry
- Electrochemistry
- Chemical sensing
Background:
- Potentiometric determination of carbon dioxide (CO2) is crucial in various scientific fields.
- Solid-state systems offer potential advantages for CO2 sensing applications.
- Understanding the fundamentals, possibilities, and challenges of these systems is essential.
Purpose of the Study:
- To survey and evaluate solid-state systems for the potentiometric determination of CO2.
- To investigate the electrochemical reactions and stability of sensor components.
- To compare experimental sensor performance with thermodynamic predictions.
Main Methods:
- Survey of different solid-state systems for CO2 determination.
- Electrochemical characterization of sensors involving sodium carbonate (Na2CO3) and various oxides.
- Testing sensor stability and signal response with different test gases.
- Comparison of measured cell tensions (emf) with thermodynamically calculated values.
Main Results:
- Sensors utilizing Na(2)YZr(PO(4)) as a solid electrolyte with MoO(3) or SiO(2) showed unstable signals due to chemical reactions.
- Satisfactory and long-term stable signals were obtained with specific galvanic cells.
- Experimental standard cell tensions (U*) showed good agreement with thermodynamically calculated values.
Conclusions:
- The choice of solid electrolyte and oxide is critical for stable CO2 potentiometric sensors.
- Specific galvanic cell configurations demonstrate reliable performance for CO2 determination.
- The findings support the thermodynamic principles governing these electrochemical sensors.