Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5150618 | Solid State Ionics | 2017 | 8 Pages |
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 electrochemical impedance 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 analytical investigations of cell cross sections by SEM 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.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Andreas Egger, Nina Schrödl, Christian Gspan, Werner Sitte,