Abstract
This thesis investigates the potential of acceptor-doped ceria as a fuel electrode for CO2 electrolysis in solid oxide cells (SOC's). Specifically, it proposes a single-phase 10 mol% gadolinium-doped ceria (GCO) electrode as an alternative to the conventional Ni-YSZ (yttria-stabilized zirconia) electrode, aiming to address existing challenges. We demonstrate that the GCO-based SOC achieves stable, high performance, with a current density of 1.51 A cm⁻² at 1.5 V and 800 ˚C, and a Faradaic efficiency of 94% — the best performance reported to date among all-ceramic cathode materials. Detailed analysis of the data reveals that the GCO electrode performance in pure CO2 electrolysis is directly linked to its bulk electronic conductivity, which is associated with the electronic charge carrier concentration in GCO.The research focuses on examining the electrical conductivity of GCO, elucidating the CO2 reduction mechanism on the surface of the GCO electrode, and determining the optimal electrode thickness.
Original language | English |
---|---|
Qualification | Doctor of Philosophy |
Awarding Institution |
|
Supervisors/Advisors |
|
Award date | 19 Sept 2024 |
Place of Publication | Enschede |
Publisher | |
Print ISBNs | 978-90-365-6262-1 |
Electronic ISBNs | 978-90-365-6263-8 |
DOIs | |
Publication status | Published - Sept 2024 |