CeO2 thin film electrode with a built-in electrochemically resetable oxidant for potentiometric stripping analysis
✍ Scribed by Gabrijela Tavčar; Božidar Ogorevc; Xiaohua Cai; Boris Pihlar
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 620 KB
- Volume
- 329
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
In this work a sol-gel derived CeOz thin film, deposited on a glass substrate, was investigated for its potential use as a working electrode in potentiometric stripping analysis (PSA). The work was focused primarily on examination of the PSA performance of a Ce02 film electrode, where Ce(IV) can be exploited as a built-in chemical oxidant that can be electrochemically regenerated by the application of an appropriate anodic potential. The CeOz thin film electrode exhibits a well-defined PSA response to Cu *+ in a solution, chosen as a convenient test cation. Its electrochemical behaviour in the presence of supporting electrolyte LiCl and Cu*+ was investigated by cyclic voltammetry. It was found that a very simple but crucial electrochemical pretreatment and conditioning of the CeO:, electrode was necessary for its good PSA performance. The parameters influencing the PSA signal, such as deposition potential and time, were studied. The linearity of the PSA signal versus Cu2+ concentration and its repeatability were also examined and found satisfactory. The suitability of the Ce02 thin film as a mercury free PSA electrode, with no need of an external oxidant, is discussed.