Kotoulas, Konstantinos (2026) Performance of Sr2Fe1.3Mo0.5Ni0.2O6-δ as fuel electrode in symmetrical solid oxide electrolysis cell (sSOEC) for “fuel assisted” steam/CO2 co-electrolysis. Master's Thesis / Essay, Chemical Engineering.
|
Text
Konstantinos-Kotoulas-M.Sc.-Thesis--Final-Report.pdf Download (8MB) | Preview |
Abstract
This thesis evaluates Sr₂Fe₁.₃Mo₀.₅Ni₀.₂O₆−δ (SFMNi) as a symmetrical electrode material for conventional and fuel-assisted steam/CO₂ co-electrolysis. Structural characterization confirmed that Ni incorporation preserved the double-perovskite framework, while reduction induced lattice expansion and the exsolution of Fe–Ni nanoparticles. Increasing the reduction temperature promoted particle growth and reduced particle density, with 700 °C providing the most favorable balance between small particle size and high surface population. Electrochemical testing at 800 °C showed comparable performance for steam electrolysis and steam/CO₂ co-electrolysis. Increasing current enhanced H₂ and CO production and shifted the H₂/CO ratio toward approximately 2, which is suitable for Fischer–Tropsch synthesis. Replacing air with H₂ or CH₄ reduced the effective voltage demand, with H₂ assistance giving the strongest improvement. During methane-assisted operation, moderate oxide-ion flux favored partial methane oxidation and syngas formation, whereas higher current increased CH₄ conversion but promoted complete oxidation to CO₂ and H₂O. Post-mortem SEM and EDS showed that the multilayer cell architecture remained structurally intact without major delamination or elemental redistribution. Overall, SFMNi is a promising symmetrical electrode for fuel-assisted co-electrolysis, although further work is required to control nanoparticle coarsening, improve syngas selectivity and confirm long-term stability.
| Item Type: | Thesis (Master's Thesis / Essay) |
|---|---|
| Supervisor name: | Kyriakou, V. and Heeres, H.J. |
| Degree programme: | Chemical Engineering |
| Thesis type: | Master's Thesis / Essay |
| Language: | English |
| Date Deposited: | 06 Aug 2026 11:58 |
| Last Modified: | 06 Aug 2026 11:58 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/37494 |
Actions (login required)
 |
View Item |