SOFC Stack Operation: Effects of Electrode-Interconnect Contacts

Abstract

Planar SOFC multi-cell stacks incorporating metallic interconnects generally exhibit average cell performance lower than that observed for out-of-stack cells under similar conditions. It has been suggested that electrode-interconnect, especially cathode-interconnect, contacts (and their ohmic resistances) are the main cause for this observed difference. In addition, cathode-interconnect contacts can evolve in long-term operation, resulting in stack performance reduction/degradation with time. Experiments using current interruption, AC electrochemical impedance and other characterization techniques have been conducted on single-cell stacks and button cells in contact with interconnect materials. The data obtained to date confirmed the hypothesis that contact ohmic resistance significantly contributes to stack performance losses. This paper summarizes and discusses experimental results on the effects of cathode-interconnect contacts on stack performance.

Meeting Name

14th International Symposium on Solid Oxide Fuel Cells, SOFC 2015; held as part of the Electrochemical Society, ECS Conference on Electrochemical Energy Conversion and Storage (2015: Jul. 26-31, Glasgow, UK)

Department(s)

Materials Science and Engineering

Keywords and Phrases

Cathodes; Digital storage; Electrodes; Fuel storage; Ohmic contacts; Cell performance; Characterization techniques; Current interruption; Electrochemical impedance; Interconnect materials; Metallic interconnects; Multi-cell stacks; Stack performance; Solid oxide fuel cells (SOFC)

International Standard Book Number (ISBN)

978-1607685395

International Standard Serial Number (ISSN)

1938-5862

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2015 Electrochemical Society Inc., All rights reserved.

Publication Date

31 Jul 2015

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