About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Ceramics for Clean Hydrogen
|
| Presentation Title |
Oxygen Electrode Materials Development for SOEC Operation at Lower Temperatures |
| Author(s) |
Surendra Karki, Tian Liu, Long Le, Sanghoon Lee, Lorraine M. Seymour, Sangbong Ryu, Minda Zou, Michael Fuller, Olga A. Marina, Deepika Malhotra |
| On-Site Speaker (Planned) |
Surendra Karki |
| Abstract Scope |
Oxygen electrode materials with high catalytic activity and mixed ionic-electronic conductivity are critical for efficient solid oxide electrolysis cell (SOEC) operation at ≤750 °C. In this work, three complementary classes of perovskite oxide-based materials are explored: ABO3 perovskites, A2BO4 Ruddlesden-Popper oxides, and double perovskite oxides (AA′BB′O6 and AA′BB′O5+δ). LSCF, La2NiO4, Sr2FeMoO6, and La2FeCoO5+δ serve as baseline compositions subjected to systematic A- and B-site tuning to control lattice parameters, defect chemistry, oxygen non-stoichiometry, and electrical conductivity. All materials were synthesized by glycine-nitrate combustion, characterized by X-ray diffraction, and optimized by attrition milling. Symmetric cells on scandia-stabilized zirconia support were used to measure activation energy and polarization resistance, and promising compositions were further tested in full cells. Several optimized electrodes outperformed standard LSCF, demonstrating effective compositional tuning for low-temperature SOEC operation. |
