The constant potential amperometrical response of the planar electrochemical carbon monoxide sensor

✍ Scribed by A. Yasuda; T. Fujioka; N. Yamaga; S. Kusanagi

• Publisher: Elsevier Science
• Year: 1991
• Weight: 344 KB
• Volume: 15
• Category: Article
• ISSN: 0923-1137
• DOI: 10.1016/0923-1137(91)90164-j

✦ Synopsis

A planar electrochemical carbon monoxide sensor, which comprised three electrodes (working, counter and reference) on a substrate and a polymer electrolyte layer on them, was built and studied The working and counter electrodes were made with platinum, while the reference electrode was made with gold. The polymer electrolyte layer was made by casting a copolymer from tetrafluoroethylene and perfluoro-3,6-dioxa-4-methyl-7-octenesulfoxide solution. The response to CO in air was studied by constant potential amperometry. The highest CO oxidation current was observed at 0.4 V versus Au built-in reference and a sensitivity of O. 04 nA /ppm was obtained. However, the proportionality of response was limited up to 700 ppm and the response was dependent on the relative humidity of the air.