Comparative study of perovskites as cathode contact materials between an La0.8Sr0.2FeO3 cathode and a Crofer22APU interconnect in solid oxide fuel cells

LaCo0.6Ni0.4O3−δ as cathode contact material for intermediate temperature solid oxide fuel cells

“…It is confirmed that the area specific resistance (ASR) at these contact interfaces increases with operating time due to oxide scale formation on the surface of the metallic interconnect and subsequent reaction between the contact material and the oxide scale [20,21]. Cr in the oxide scale will reacts with Sr in the contact material to form resistive SrCrO 4 phase or replaces the B-site element in perovskite structure to form Cr-containing perovskites [14,21,22]. In order to prevent dimension shrinkage of the contact layer during operation and enhance its adhesion to the oxide scale of the interconnect, pre-sintering of the contact layer in a low oxygen partial pressure atmosphere was found to be effective [11,23].…”

“…Conventional cathode materials, such as La 1Àx Sr x MnO 3 (LSM), La 1Àx Sr x Co 1Ày Fe y O 3 (LSCF) and LaNi y Fe 1Ày O 3 (LNF) [18,19], are also the possible contact materials. It is confirmed that the area specific resistance (ASR) at these contact interfaces increases with operating time due to oxide scale formation on the surface of the metallic interconnect and subsequent reaction between the contact material and the oxide scale [20,21]. Cr in the oxide scale will reacts with Sr in the contact material to form resistive SrCrO 4 phase or replaces the B-site element in perovskite structure to form Cr-containing perovskites [14,21,22].…”

Development and characterization of a quasi-ternary diagram based on La0.8Sr0.2(Co,Cu,Fe)O3 oxides in view of application as a cathode contact material for solid oxide fuel cells

“…Previous works demonstrated that the reactive sintering procedure decreases the sintering temperature of such composition spinels and therefore increases the life time of the ferritic steel substrate. When no reactive sintering is used we needed temperatures above 1050°C for obtaining an adequate densification of the spinel [17]. At this temperature the oxide formation on the substrate alloy is high enough to dramatically increase the resistivity and decrease the ferritic steel life time, which is mainly controlled by the Cr content in the steel [18].…”

Evaluation of Ag–NiO mixture as a cathode contact material for solid oxide fuel cell applications

“…1)10) The contact paste is normally prepared as a mixture of conductive powder and organic binder which is burnt out at elevated temperatures. The remained layer of powder particles serves with conductivity depending on factors such as the degree of particle sintering, distribution density, and intrinsic electrical properties.…”