Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10269409 | Electrochimica Acta | 2005 | 8 Pages |
Abstract
Ag/AgCl reference electrodes without KCl-containing membrane (“quasi-reference” electrodes) have been fabricated by means of thick-film technique (screen-printing technique) and thin-film technique (electron-beam evaporation/chlorination or electron-beam evaporation/pulsed laser deposition). The different types of reference electrodes were characterised by means of scanning electron microscopy as a function of their preparation parameters. The potentials of the “quasi-reference” electrodes were measured versus a commercial Ag/AgCl reference electrode in 3Â M KCl solution. The potential stability was up to 10Â h (thin-film technique) and more than 1200Â h (thick-film technique). In a next step, an additional KCl-containing agar membrane was deposited and different coatings have been used to protect the reference electrode from a fast leaching out of KCl. The leaching out could be improved from originally 3Â h (by using no protective coating on top of the agar membrane) up to 50 days by using polyvinylchloride/nafion (PVC/N) or polyvinylchloride (PVC) as protective coating. Additionally, poly-(2-hydroxyethyl methacrylate) (pHEMA) has been studied as an alternative material for agar.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Anette Simonis, Marek Dawgul, Hans Lüth, Michael J. Schöning,