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Research Papers

On the Identification of Impedance Spectroscopy Processes of an SOFC Under Different Hydrogen Concentrations

[+] Author and Article Information
Gianfranco DiGiuseppe1

 Kettering University, 1700 University Avenue, Flint, MI 48504

Li Sun

 Kettering University, 1700 University Avenue, Flint, MI 48504

1

Corresponding author.

J. Fuel Cell Sci. Technol 9(5), 051004 (Aug 22, 2012) (5 pages) doi:10.1115/1.4007220 History: Received January 28, 2012; Revised May 02, 2012; Published August 22, 2012; Online August 22, 2012

This paper reports a series of new electrochemical impedance measurements that were performed on an anode supported planar solid oxide fuel cell (SOFC) tested at different anode gas conditions and at different applied voltages. This study indicates that impedance spectroscopy can resolve four different processes, as long as one of those processes does not become too large. At open circuit voltage the four processes can be resolved best; however, as a voltage is applied the processes are convoluted and cannot be resolved properly. Two of the processes seem to remain almost unchanged as the fuel conditions are changed and can be attributed to the cathode. The two anode processes change with the fuel conditions and both indicate a dependence on charge transfer and diffusion. This methodology can be applied to determine the mode or modes of SOFC degradation for long term testing where one or both electrodes are deteriorating over time.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 9

Fitting results at open circuit voltage and 800 °C (range 1.0–1.1 V) at different concentrations of hydrogen using the equivalent circuit LRo (C1 R1 )(Q2 R2 )(Q2 R3 )(C4 R4 )

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Figure 10

Nyquist representation of the impedance data at OCV and different partial pressure of hydrogen for a different cell at 750 °C. Solid points indicate frequency decades.

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Figure 11

Fitting results at open circuit voltage (range 1.0–1.1 V) at different concentrations of hydrogen using the equivalent circuit LRo (C1 R1 )(Q2 R2 )(Q2 R3 )(C4 R4 ) for the cell shown in Fig. 1

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Figure 8

Total polarization resistance estimated from Nyquist plots (800 °C)

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Figure 7

Ohmic resistance estimated from Nyquist plots (800 °C)

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Figure 6

Nyquist representation of the impedance data at 5% hydrogen and different applied voltages (800 °C)

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Figure 5

Nyquist representation of the impedance data at 0.7 V and different partial pressure of hydrogen (800 °C). Solid points indicate frequency decades.

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Figure 4

Nyquist representation of the impedance data at 0.9 V and different partial pressure of hydrogen (800 °C). Solid points indicate frequency decades.

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Figure 3

Nyquist representation of the impedance data at OCV and different partial pressure of hydrogen (800 °C). Solid points indicate frequency decades and inset indicates the proposed four arcs.

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Figure 2

Cell ASR curves at 800 °C and different anode gas conditions

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Figure 1

Voltage-current density curves at 800 °C and different anode gas conditions

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