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Research Papers

Experimental Evaluation of Planar SOFC Single Unit Cell With Crofer22APU Plate Assembly

[+] Author and Article Information
P. Leone1

Dipartimento di Energetica, Politecnico di Torino, Torino 10129, Italypierluigi.leone@polito.it

A. Lanzini, B. Delhomme, G. A. Ortigoza-Villalba, M. Santarelli

Dipartimento di Energetica, Politecnico di Torino, Torino 10129, Italy

F. Smeacetto, M. Salvo, M. Ferraris

Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, Torino 10129, Italy

1

Corresponding author.

J. Fuel Cell Sci. Technol 8(3), 031009 (Feb 22, 2011) (8 pages) doi:10.1115/1.4003227 History: Received March 15, 2010; Revised November 11, 2010; Published February 22, 2011; Online February 22, 2011

This paper describes an experimental analysis of a planar solid oxide fuel cell (SOFC) single unit cell with Crofer22APU plate assembly. The work reports the electrical behavior of such a system by outlining the time-evolution of contact resistances between the air electrode and the stainless steel plate. Moreover, the stability and effectiveness of a glass-ceramic sealant used to join Crofer22APU interconnector to an anode supported cell is also discussed. The time-evolution of the open circuit voltage was investigated with respect to the eventual sealant degradation or chromium poisoning issues by the metallic interconnector; a rapid voltage degradation at open circuit voltage was measured after 150 h. Chromium poisoning was found to degrade the fuel cell performance, whereas the sealant was chemically and physically stable, as shown by a post-mortem analysis on the cell components.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental set-up for the SOFC single unit cell with Crofer22APU plate assembly

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Figure 2

Schematic view of the sealed SOFC single unit cell with Crofer22APU plate assembly

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Figure 3

Experimental results of direct contact SOFC cathode and Crofer22APU

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Figure 4

Experimental results of a SOFC cell/40 mesh Inconel601 current collector/Crofer22APU interconnector

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Figure 5

Voltage-time behavior of a SOFC short assembly with the sealant in an aging experiment

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Figure 6

Top view of a LSM current collector after a 300 h experiment without the Crofer22APU interconnector (standard testing procedure)

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Figure 7

Top view of a LSM current collector after a 300 h experiment with the Crofer22APU interconnector

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Figure 8

Cross section of a LSM/YSZ functional layer after a 300 h experiment without the Crofer22APU interconnector

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Figure 9

Cross section of a LSM/YSZ functional layer after a 300 h experiment with the Crofer22APU interconnector

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Figure 10

Detail of the Crofer22APU interconnector/glass-ceramic sealant/ASC joint (Area A)

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Figure 11

SEM micrograph of the glass-ceramic/ASC interface at the center zone (Area B)

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Figure 12

SEM cross section and relative EDS elements mapping of the Crofer22APU-glass-ceramic sealant interface (Area C)

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Figure 13

SEM observation at the cathode side with an outline of the LSM current collector top view

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Figure 14

EDS analysis conducted on the crystals on the cathode surface (referred to Fig. 1)

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