Patent ID: 8702962
Filing Date: 2014-04-22
Classification: G01N

Abstract:
1. A process for sensing carbon dioxide, including the following steps: applying a constant direct current voltage across a pair of electrodes, said electrodes being separated by an electrolyte material containing sodium, said electrodes located between a layer of Alumina substrate and a carbonate layer of auxiliary electrolyte, and, an extra layer of metal oxide selected from the group consisting of SnO reacting carbon dioxide with said electrolyte material containing sodium at a first three-point boundary, said first three point boundary being at the joinder of one of said electrode, said electrolyte material containing sodium, and a barium containing auxiliary electrolyte; reacting an oxide of sodium at a second three-point boundary, said second three-point boundary being at the joinder of the other of said electrodes, said electrolyte material containing sodium, and a barium containing auxiliary electrolyte; measuring the resulting current; and, correlating change in current to the concentration of carbon dioxide.