Electrochemical Operation of La(Ni,Fe)O3 under Cr-Poisoning Conditions

Autor:	M.K. Stodolny, Dave H. A. Blank, Frans Van Berkel, Bernard A. Boukamp
Rok vydání:	2013
Předmět:	Interconnection Materials science Electrochemistry Cathode Thermal expansion law.invention Metal Chemical engineering law visual_art visual_art.visual_art_medium Cubic zirconia Solid oxide fuel cell Perovskite (structure)
Zdroj:	ECS Transactions. 50:133-142
ISSN:	1938-6737 1938-5862
Popis:	This study demonstrates the significant impact of Cr-poisoning on the electrochemical operation of the LaNi0.6Fe0.4O3 (LNF) SOFC cathode under current load. Volatile Cr-species, originating from a porous metallic foam, enter the working electrode and modify both the LNF cathode layer and the Gd0.4Ce0.6O1.8 (GDC) barrier layer, causing increasing overpotential and cell impedance. The increase of the ohmic resistance is caused by a decrease of the in-plane electronic conductivity of the LNF layer combined with a deterioration of the ionic conductivity of the GDC barrier layer. The increase of the polarisation resistance is caused by a decrease of the electrochemical activity of the LNF surface towards oxygen reduction reaction at the triple phase boundary (TPB) due to Cr-incorporation in the outer shell of the LNF grains. Chemical reaction and electrochemically-driven reaction of volatile Cr-species with LNF and GDC contributes to the extrinsic degradation of the LNF cathodes under current load.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::904153fdc23cd4daa912d7bc48dacf8b https://doi.org/10.1149/05027.0133ecst Zobrazit plný text záznamu