Megha Rao and Søren H. Jensen and Xiufu Sun and Anke Hagen and Mogens B. Mogensen
Effect of Leaks in Solid Oxide Electrolysis Cells Tested for Durability under CoElectrolysis Conditions
208 - 214
2019
13
4
International Journal of Energy and Power Engineering
https://publications.waset.org/pdf/10010212
https://publications.waset.org/vol/148
World Academy of Science, Engineering and Technology
Solid oxide electrolysis cells have an immense potential in converting CO2 and H2O into syngas during coelectrolysis operation. The produced syngas can be further converted into hydrocarbons. This kind of technology is called powertogas or powertoliquid. To produce hydrocarbons via this route, durability of the cells is still a challenge, which needs to be further investigated in order to improve the cells. In this work, various nickelyttria stabilized zirconia (NiYSZ) fuel electrode supported or YSZ electrolyte supported cells, cerium gadolinium oxide (CGO) barrier layer, and an oxygen electrode are investigated for durability under coelectrolysis conditions in both galvanostatic and potentiostatic conditions. While changing the gas on the oxygen electrode, keeping the fuel electrode gas composition constant, a change in the gas concentration arc was observed by impedance spectroscopy. Measurements of open circuit potential revealed the presence of leaks in the setup. It is speculated that the change in concentration impedance may be related to the leaks. Furthermore, the cells were also tested under pressurized conditions to find an interplay between the leak rate and the pressure. A mathematical modeling together with electrochemical and microscopy analysis is presented.
Open Science Index 148, 2019