Many processes contribute to the overall impedance of an electrochemical cell, and these may be difficult to separate in the impedance spectrum. Here, we present an investigation of a solid oxide fuel cell based on differences in impedance spectra due to a change of operating parameters and present the result as the derivative of the impedance with respect to . The method is used to separate the anode and cathode contributions and to identify various types of processes.
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Jensen et al. (2007) studied this question.
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