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Catalytic activity and performance of LSM cathode materials in single chamber SOFC

Paper ID Volume ID Publish Year Pages File Format Full-Text
43621 45979 2007 7 PDF Available
Title
Catalytic activity and performance of LSM cathode materials in single chamber SOFC
Abstract

The catalytic activity of symmetrical LSM (La0.8Sr0.2MnO3) cells operated under single chamber solid oxide fuel cell (SC-SOFC) conditions was investigated for methane-to-oxygen ratios Rin between 1 and 2. The oxidation reactions over electrodes sintered at 1100 °C (LSM1100) and 1200 °C (LSM1200) were studied, and the effect of any combustion was followed through electrochemical impedance spectroscopy (EIS). The activity of the LSM1100 electrode increases with temperature. Above 700 °C, the conversion of the oxygen species may exceed 30%. As a consequence, oxygen depletion is occurring and a low frequency semicircle in the EIS spectra becomes predominant. An increase of the sintering temperature to 1200 °C leads to a decrease in the catalytic activity. A LSM1100 electrode deposited on a Jülich half-cell proves to reach better performance at 600 °C than at 700 °C. On such complete cells, however, the catalytic combustion becomes much more complex than on a LSM cathode alone. We are thus proposing a comprehensive parameter, Rout, that is summarizing the processes inside the single chamber reactor.

Graphical abstractThe catalytic activity of symmetrical LSM cells operated under single chamber SOFC conditions was investigated. The oxidation reactions over electrodes sintered at 1100 and 1200 °C were studied. The effect of any combustion was followed through electrochemical impedance spectroscopy. A LSM1100 electrode deposited on a Jülich half-cell was studied and proves to reach better performance at 600 °C than at 700 °C.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Single chamber SOFC; LSM cathode; Methane conversion; Impedance; Cell performance
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 323, 30 April 2007, Pages 181–187
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
Online Support
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