La 2 NiO 4+ δ as electrode material for solid oxide fuel cells and electrolyzer cells

Andreas Egger, Nina Schrödl, Christian Gspan, Werner Sitte

Research output: Contribution to journalArticle

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.
Original languageEnglish
Pages (from-to)18-25
JournalSolid State Ionics
Volume299
DOIs
Publication statusPublished - 2017

ASJC Scopus subject areas

  • Materials Science(all)

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)

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