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Characteristics of Solid‐State Amperometric Oxygen Sensor Using Pt/C Film Hot‐Pressed onto Nafion Membrane
Author(s) -
Liu YuChuan,
Hwang BingJoe,
Tzeng IouJeng
Publication year - 2001
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200111)13:17<1441::aid-elan1441>3.0.co;2-a
Subject(s) - nafion , wetting , amperometry , electrode , materials science , oxygen sensor , oxygen , analytical chemistry (journal) , composite number , response time , platinum , chemical engineering , composite material , catalysis , electrochemistry , chromatography , chemistry , organic chemistry , engineering , computer graphics (images) , computer science
Oxygen was sensed on the Pt/C/Nafion composite electrodes prepared by a hot‐pressed method in this study. The results reveal that the sensitivity of the electrode increases with an increase of Pt loading. At a Pt loading of 3.0 mg/cm 2 , the sensitivities of the electrodes treated by direct wetting and indirect wetting methods are 0.207 and 0.415 μA/ppm, respectively, in the O 2 concentration range of 1236–5150 ppm. It indicates that indirect wetting is a better method for moistening the hydrophobic electrode. Generally, both the response time and the recovery time decrease significantly with increasing Pt loading. The prepared electrode has the advantage of a higher catalytic surface area, which results in the sensitivity being 40 times higher than that of electrodes prepared by other methods at the same Pt loading. Meanwhile, a sensing model was proposed to illustrate the sensing phenomenon.