Carbon monoxide and toxic gas sensor with humidity compensation based on protonic conductive membranes and method of fabrication

摘要

A low cost room temperature electrochemical gas sensor with humidity compensation for sensing CO, alcohol vapors and other toxic analyte gases has a solid protonic conductive membrane with a low bulk ionic resistance. A sensing electrode and a count electrode, optionally a count electrode and a reference electrode, which are separated by the membrane, can be made of mixed protonic-electronic conductors, or can be made of a thin electrically conducting film such as platinum. A reservoir of water maintain the solid protonic conductive membrane at constant 100 percent relative humidity to compensate for ambient humidity changes. Embodiments of the inventive sensor also include an electrochemical analyte gas pump to transport the analyte gas away from the count electrode side of the sensor. Analyte gas pumps for the inventive sensor include dual pump electrodes situated on opposite sides of the membrane, and include a means for applying a DC power across the membrane to the sensing and count electrodes. Another embodiment of the inventive sensor has first and second solid protonic conductive membranes, one of which has a sensing electrode and a count electrode separated by the first membrane, and the other of which has dual pump electrodes situated on opposite sides of the second membrane. IMAGE