Journal article
EMF measurements on mixed protonic/electronic conductors for hydrogen membrane applications
Electroceramics, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark1
Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Ceramic processing, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark4
Electromotive force (EMF) measurements are often used to estimate the transport number of conducting species in ionic and mixed conductors. In this work, the applicability of the method to systems, where both protonic, oxide-ionic and electronic conduction is significant, was examined. The effect of electrode polarisation resistance, water vapour concentration and impurities was analysed.
Samples of SrCe0.95Y0.05O3 − δ were prepared and used in a number of EMF measurements, including wet and dry hydrogen and oxygen concentration cells. It was found that concentration cells including water vapour gave large errors in the determination of the oxide-ionic transport number, but gave good estimates of the protonic transport number.
The protonic transport number was estimated to around 0.80 at 600 °C, decreasing to around 0.65 at 800 °C, consistent with previous investigations on similar materials.
| Language: | English |
|---|---|
| Year: | 2010 |
| Pages: | 249-255 |
| ISSN: | 18727689 and 01672738 |
| Types: | Journal article |
| DOI: | 10.1016/j.ssi.2009.11.002 |
| ORCIDs: | Bonanos, Nikolaos |
