Diffusion Impedance on Nickel/Gadolinia-Doped Ceria Anodes for Solid Oxide Fuel Cells

Journal article (2009)
Department
Process and Energy (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: The Electrochemical Society
DOI: https://doi.org/doi:10.1149/1.3231490
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Published Date

09-10-2009

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Source:

Journal of the Electrochemical Society, 156 (12), 2009

Faculty

Mechanical, Maritime and Materials Engineering

Department

Process and Energy

Abstract

Electrochemical impedance measurements were carried out on symmetrical nickel/gadolinia-doped ceria test cells. For H2, N2, and H2O mixtures, the diffusion length obtained based on the impedance measurements is on the order of centimeters. This high value of the diffusion length is attributed to the flow field in the reactor. It is suggested that a detailed analysis of the gas flow field inside the test reactor is essential before interpreting the impedance measurements with various solid oxide fuel cell test configurations.

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