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SPECIAL SECTION ON THE 2ND EUROPEAN FUEL CELL TECHNOLOGY AND APPLICATIONS CONFERENCE

Spatially Resolved Measuring Technique for Solid Oxide Fuel Cells

[+] Author and Article Information
Patrick Metzger, K. Andreas Friedrich, Caroline Willich

Institut für Technische Thermodynamik, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany

Günter Schiller1

Institut für Technische Thermodynamik, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Pfaffenwaldring 38-40, D-70569 Stuttgart, Germanyguenter.schiller@dlr.de

1

Corresponding author.

J. Fuel Cell Sci. Technol 6(2), 021304 (Feb 27, 2009) (4 pages) doi:10.1115/1.3080548 History: Received January 18, 2008; Revised April 21, 2008; Published February 27, 2009

In order to optimize solid oxide fuel cells for operation in highly efficient systems, a new measuring system with segmented cells has been developed, which allows us to determine local effects and to identify critical operating parameters during operation. The setup of the measuring system and experimental results for two examples—influence of hydrogen content and fuel utilization on performance and influence of load on power density and fuel utilization at operation with gasoline reformate as fuel—are presented to demonstrate the potential of the spatially resolved measuring technique.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 2

Locally resolved power density distribution (filled bars) and fuel utilization (filled symbols) for different hydrogen concentrations of the electrolyte-supported cell ESC2 (InDEC)

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Figure 4

I-V characteristics of an anode-supported cell with LSCF cathode (ASC2) for comparison of operation with pure gases (20% CO or 20% H2) and of CO and H2 mixtures (20% H2+20% CO). Gas flow of 0.025 slpm/cm2+3%H2O.

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Figure 5

Comparison of power density and fuel utilization along the flow path during variation the area-specific load of an ASC2 cell (active area: 73.96 cm2) during operation with reformate gas; counterflow mode, fuel gas inlet at segment 9, fuel gas outlet at segment 12; current density equivalent: 0.552 A/cm2; air flow rate: 0.02 slpm/cm2

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Figure 6

Comparison of product and educt concentrations along the flow path of an anode-supported cell (ASC2) at 0 mA/cm2. Active cell area: 73.78 cm2; operating conditions: 54.9% N2, 16.7% H2, 16.5% CO, 6.6% CH4, 2.2% CO2, and 3.2% H2O; gas flows: 0.552 A/cm2 current density equivalent, 0.02 slpm/cm2 air, 800°C.

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Figure 7

Comparison of product and educt concentrations along the flow path of an anode-supported cell (ASC2) at 100 mA/cm2. Active cell area: 73.78 cm2, operating conditions: 54.9% N2, 16.7% H2, 16.5% CO, 6.6% CH4, 2.2% CO2, and 3.2% H2O; gas flows: 0.552 A/cm2 current density equivalent, 0.02 slpm/cm2 air, 800°C.

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Figure 8

Comparison of product and educt concentrations along the flow path of an anode-supported cell (ASC2) at 435 mA/cm2. Active cell area: 73.78 cm2; operating conditions: 54.9% N2, 16.7% H2, 16.5% CO, 6.6% CH4, 2.2% CO2, and 3.2% H2O; gas flows: 0.552 A/cm2 current density equivalent, 0.02 slpm/cm2 air, 800°C.

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Figure 3

Comparison of calculated (filled symbols) and measured hydrogen concentration (open symbols) by gas chromatography for a segment row in the ESC2 cell. Average cell voltage: 0.6 V; operating temperature: 800°C; fuel flow: 0.025 slpm/cm2 (slpm denotes standard liters per minute) H2+N2+H2O; oxide flow: 0.08 slpm/cm2 air, 73.96 cm2. Fuel enters from the left side at segment 5.

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Figure 1

Setup of measuring system for the characterization of segmented cells with both cathode and anode segmentation

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