On The Properties And Long-Term Stability Of Infiltrated Lanthanum Cobalt Nickelates (Lcn) In Solid Oxide Fuel Cell Cathodes

Abstract

Infiltration as a fabrication method for solid oxide fuel cells (SOFC) electrodes is offering significant improvements in cell performance at reduced materials and fabrication costs, especially when combined with co-sintering. However, important questions regarding the long-term performance and microstructural stability remain unanswered. Here, we present the results of a three-year project, where large footprint anode-supported SOFCs with a co-sintered cathode backbone and infiltrated La0.95Co0.4Ni0.6O3 (LCN) cathodes were developed and thoroughly characterized. The initial long-term performance and stability of this new cell type was investigated for 1500+ hours, coupled with STEM-EDS investigation of the microstructural changes in the infiltrated electrodes. Additionally, electrodes were further aged at elevated temperatures (750-900°C) for periods reaching up to 5000 hours, while following changes in the electrode properties using SEM, BET area, and in-plane conductivity measurements. Finally, the mechanical properties of co-sintered cathode backbone cells were determined in four-point bending tests carried out both at room temperature and at 800°C in air. Based on these results, degradation mechanisms were identified and recommendation for safe operation conditions in real life application could be formulated.

Publication Date

1-1-2017

Publication Title

Journal of the Electrochemical Society

Volume

164

Issue

7

Number of Pages

F748-F758

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1149/2.0361707jes

Socpus ID

85019977108 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85019977108

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