Abstract
In this work, the mixed ionic-electronic conducting ceramic La2NiO4+δ
is investigated with respect to its applicability as SOFC cathode as well as SOEC anode material on the basis of electrolyte-supported button cells. Results are obtained by electrochemicalimpedance spectroscopy and current-voltage analyses on symmetrical cells with screen printed La2NiO4+δ electrodes under both anodic and cathodic polarization, where special emphasis is put on the chromium tolerance of the material. The long-term behavior of electrodes in pure oxygen/argon as well as in humidified chromium-containing atmospheres is studied at 800 °C both under open circuit conditions and with applied current load. Once a chromium source is introduced in humid conditions, a strong decline in the cell performance occurs which can be mainly ascribed to a deactivation of the SOFC cathode layer. Post-test an-alyticalinvestigations of cellcross sectionsbySEM and TEM suggest differences in the extent of Cr-contamination to be the main factor for the pronounced discrepancy between degradation rates of both electrodes.
is investigated with respect to its applicability as SOFC cathode as well as SOEC anode material on the basis of electrolyte-supported button cells. Results are obtained by electrochemicalimpedance spectroscopy and current-voltage analyses on symmetrical cells with screen printed La2NiO4+δ electrodes under both anodic and cathodic polarization, where special emphasis is put on the chromium tolerance of the material. The long-term behavior of electrodes in pure oxygen/argon as well as in humidified chromium-containing atmospheres is studied at 800 °C both under open circuit conditions and with applied current load. Once a chromium source is introduced in humid conditions, a strong decline in the cell performance occurs which can be mainly ascribed to a deactivation of the SOFC cathode layer. Post-test an-alyticalinvestigations of cellcross sectionsbySEM and TEM suggest differences in the extent of Cr-contamination to be the main factor for the pronounced discrepancy between degradation rates of both electrodes.
Original language | English |
---|---|
Pages (from-to) | 18-25 |
Journal | Solid State Ionics |
Volume | 299 |
DOIs | |
Publication status | Published - 2017 |
ASJC Scopus subject areas
- Materials Science(all)
Fields of Expertise
- Advanced Materials Science
Treatment code (Nähere Zuordnung)
- Basic - Fundamental (Grundlagenforschung)