Characteristics of Solid-State Amperometric Oxygen Sensor Using Pt/C Film Hot-Pressed onto Nafion Membrane
✍ Scribed by Yu-Chuan Liu; Bing-Joe Hwang; Iou-Jeng Tzeng
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 300 KB
- Volume
- 13
- Category
- Article
- ISSN
- 1040-0397
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✦ Synopsis
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 mA=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.