Diffusion-type sensor cell containing sensing and counter electrodes in intimate contact with the same side of a proton-conducting membrane and method of use
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United States of America Patent
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Apr 11, 1989
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N/A
app pub date -
Feb 3, 1988
filing date -
Feb 3, 1988
priority date (Note) -
Expired
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Abstract
A fast response diffusion-type sensor cell for the detection of carbon monoxide and other oxidizable or reducible gases comprising a three-electrode hydrated proton-conducting membrane cell configuration, with all electrodes in intimate contact with the same proton-conducting membrane is described. The liquid electrolyte-free system has a porous gas-diffusion sensing electrode and a counter electrode located on the same side of and in intimate contact with the proton-conducting membrane. The reference electrode is spatially located on the same or opposite side of the membrane as are the sensing and counter electrodes. The cell configuration is advantageous in that (1) the ionic resistance value between the sensing/reference electrodes is lower than that between the sensing/counter electrodes, and (2) the sensing and counter electrodes being on the same side of the membrane and connected by one or more hydrated proton-exchange membrane channels leads to faster response times and greater immunity to interference from counter electrode reaction products.
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