Improving oxygen incorporation rate on (La0.6Sr0.4)0.98FeO3-δ via Pr2Ni1-xCuxO4+δ surface decoration

Mohamad Khoshkalam*, Ðorđije Tripković, Xiaofeng Tong, Mohammad Ali Faghihi-Sani, Ming Chen, Peter Vang Hendriksen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Insufficient electrocatalytic activity for oxygen reduction/evolution in lanthanum strontium ferrite (LSF) perovskites at temperatures below 700 °C, limits the utilization of these Co-free oxides as oxygen electrodes for intermediate-temperature solid oxide fuel/electrolysis cells (SOFC/SOEC). Marked performance improvement is here reported by decorating the surface with Pr2Ni1-xCuxO4 catalyst particles. Infiltrating porous LSF electrodes with aqueous nitrates solutions containing Pr, Ni and Cu, targeting the compositions Pr2Ni0.7Cu0.3O4 and Pr2Ni0.6Cu0.4O4, significantly reduces the polarization resistance at 650 °C from 0.98 Ω cm2 to 0.16 Ω cm2 and 0.13 Ω cm2 respectively. Electrical Conductivity Relaxation (ECR) measurements reveal that surface exchange rates, expressed by (kchem), are much more stable in week long aging experiments for Pr2Ni0.7Cu0.3O4 surface decorated LSF bars compared to the bare LSF. This shows that a Pr2Ni1-xCuxO4 infiltrated porous LSF backbone can be an efficient Co-free oxygen electrode for intermediate-temperature SOFC/SOEC.
Original languageEnglish
Article number228035
JournalJournal of Power Sources
Volume457
Number of pages12
ISSN0378-7753
DOIs
Publication statusPublished - 2020

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