Ozone reduction at Nafion modified Au electrode and the measurement of ozone concentration in highly resistive solutions
✍ Scribed by Liu Pei-Fang; Wen Li-Bai
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 493 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0256-7660
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✦ Synopsis
The maas tramport and charge transfer kinetics of omne reduction at Nafion coated Au electrodes were studied in 0.5 mol/L HzSO4 and highly resistive solutions such as distilled water and tap water. The diffusion coefficient and partition coefficient of Ozone in Nafion coating are 1 . 7 8 ~1 0 -~ cmZ-s-l and 2.75 at 25OC (based on dry state thickness), respectively. The heterogeneous rate constants and 'Ibtel slopes for ozone d u c t i o n at bare Au are 4.1~10-~ cm.s-', 1 . 0 ~1 0 -~ cm.s-' and 181 mV, 207 mV in 0.5 mol/L HzSO4 and distilled water respectively and the corresponding values for Nafion coated Au are 5.5~10-' c m s -l , l.lxlO-' cmes-' and 182 mV, 168 mV respectively. The below 5 s at 25OC. The temperature coefficient in range of 11-30°C is 1.3%.