Diffusion-type sensor cell containing sensing and counter electr

Details Diffusion-type sensor cell containing sensing and counter electr Diffusion-type sensor cell containing sensing and counter electr

1988-02-03

1989-04-11

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204412, G01N 2728, G01N 2754

Patent

active

048203866

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.

REFERENCES:
patent: 4123700 (1978-10-01), LaConti et al.
patent: 4171253 (1979-10-01), Nolan et al.
patent: 4227984 (1980-10-01), Dempsey et al.
patent: 4265714 (1981-05-01), Nolan et al.
patent: 4591414 (1986-05-01), Zaromb et al.
patent: 4707242 (1987-11-01), Schneider et al.

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