SE.4 -Effects of Cathodic Polarization on a Layered Au,Pt-YSZ Mixed-potential Gas Sensing Electrode: Studies by steadystate and dynamic electrochemical methods
- Event
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria - Chapter
- Solid Electrolyte Sensors
- Author(s)
- X. Zhang, H. Kohler, B. Ojha - Institute for Sensor and Information Systems, Karlsruhe University of Applied Sciences, Karlsruhe (Germany), U. Guth - Faculty of Chemistry and Food Chemistry, Dresden University of Technology, Dresden (Germany)
- Pages
- 400 - 401
- DOI
- 10.5162/IMCS2018/SE.4
- ISBN
- 978-3-9816876-9-9
- Price
- free
Abstract
Electrochemical characteristics of a layered Au,Pt-YSZ electrode (APE) were studied by open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) measurements. The response of the APE to CO was found to be drastically reduced after 100 days operation in ambient air, which is correlated with a clear change in the shape of the EIS characteristics and a considerably increased polarization resistance (Rp). By applying a cathodic polarization, the reduced response can be almost fully restored, and a very similar EIS characteristic as in the initial state is found. This polarization treatment will highly improve stability of the APE and enable applications like flue gas analysis.