Oxygen solid electrolyte coulometry (OSEC)

Oxygen Exchange Kinetics of SrTiO3 Single Crystals: A Non‐Destructive, Quantitative Method

“…The latter samples were electrically contacted by Ag layer of two stripes of 1 × 5 mm 2 dimension at the up facing side and one area of 0.5 × 5 mm 2 on each of the smaller side faces. This sample was then heated at 850 °C for 5 h. As described in more details in the OSEC setup consists of two oxygen pumps and measuring units “O2‐DF 28.0” (Zirox Sensoren und Elektronik GmbH, Germany), which are positioned up and downstream of a heatable gas tight reactor tube and controlled by potentiostats “Interface 1000” (Gamry Instruments Inc., USA). The measured oxygen exchange j exp (t) is the change of the oxygen quantity contained in the system ΔO 2 over the time period Δt of one second.…”

“…The only requirement for sample preparation is that the material piece is small enough to fit into the given reactor. It is therefore suitable in order to non‐destructively measure the exchange rate in time‐resolved mode without further calibration …”

A7.1 - Selective solid electrolyte sensors for trace gas concentrations

“…These can benefit often from a pre-separation of the analytes in an adapted chromatographic column. Solid electrolyte coulometric sensors are basically well suited to serve as detectors for gas chromatographic systems, since they have a broad measuring range of more than 7 orders of magnitude and short response times in the millisecond range [24]. Nevertheless, they are commonly not introduced in this field of analytics like thermal conductivity detectors or flame ionization detectors.…”

4.3 - Coulometrische Festelektrolytsensoren – Anwendungen und Fehlerquellen

“…Der zunehmende Einsatz coulometrischer Festelektrolytsensoren und Messsysteme in verschiedenen Applikationen [1] beruht auf ihrer relativ genauen Signaleinstellung auf der Basis des Faradayschen Gesetzes, die einen kalibrierfreien Betrieb über Zeiträume von mehreren Jahren und Messbereiche von mehr als 5 Zehnerpotenzen ermöglichen. Beim Einsatz solcher Sensoren für die Bestimmung von Spurengaskonzentrationen im ppm-und ppb-Bereich werden Abweichungen vom Faradayschen Gesetz sichtbar [2].…”