Constant potential electrolytic gas sensors have developed rapidly since the early 1980s. This sensor has high sensitivity, convenient use, low power consumption, good selectivity, and can detect carbon monoxide, methane, hydrogen sulfide, nitrogen oxide, nitrous oxide, and a variety of hydrocarbons. It has wide application prospects in disaster prevention and alarm in factories, mines and oil fields.
The waterproof layer, the current collecting net and the catalytic layer constitute. On the working electrode, the reactive gas can reach the catalytic layer through the waterproof layer, and react with the water in the electrolyte under the action of the catalyst to generate carbon dioxide. At the same time, the charge is released and collected by the current collector. On the counter electrode, oxygen and H The reaction generates water and releases charge. At this time, if the external circuit is turned on, a current flows.
The selectivity of the sensor depends on the choice of electrode potential and the catalyst. Larger values of different gas electrolysis currents correspond to different electrode potentials, so selecting an appropriate electrode potential can detect a specific gas without being disturbed by other gases.