Journal article
Towards Quantification of Relations Between Electrode Polarisation and Microstructure
Electrochemistry, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark1
Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Electrochemical Evaluation, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark4
The total cell resistances of three Riso DTU solid oxide fuel cells (SOFCs) were broken down into individual contributions, by the combined use of electrochemical impedance spectroscopy (EIS), and complex non-linear least squares fitting (CNLS). Information on the number of contributing processes, frequency regions, and thermal behaviour, was obtained from symmetric cell studies of individual electrodes.
The frequency regions dominated by electrode specific processes in the full cells were assessed by systematic changes of temperature and/or partial pressure of reactant gases on both electrodes. Based on the combined information, an equivalent circuit consisting of a series resistance (R-s) and five (RQ) elements was found suitable to describe the polarisation resistance of all tested cells.
The breakdown process also allowed the assessment of limitations, and possible simplifications. The proposed electrochemical analysis correlated well with the exhibited microstructural features of the cells, which were produced with different compositions and/or production parameters. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3587113] All rights reserved.
Language: | English |
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Publisher: | The Electrochemical Society |
Year: | 2011 |
Pages: | B814 |
ISSN: | 19457111 and 00134651 |
Types: | Journal article |
DOI: | 10.1149/1.3587113 |
ORCIDs: | Ramos, Tania , Hjelm, Johan and Mogensen, Mogens Bjerg |