Glass-based redox sensor

A new glass-based planar sensor for the determination of redox potentials is introduced. The sensor was fabricated by applying and sintering an iron-containing glass paste on an alumina substrate partially covered with a platinum layer. Regarding the condition of the functional glass layer, it was characterised using several physical and chemical methods. Furthermore, by means of the planar sensors, the determination of redox potentials of different redox-active substances was carried out. It could be shown that the measurement results obtained with these electrodes were comparable to those received with conventional noble metal-based redox electrodes. For sensors prepared by selected glass compositions, a significant pH dependence of the measurement signal was not detected. Moreover, the electrode could be used as working electrode for cyclic voltammetry, too.