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A Computational Study of Anomalous Cathode-Reference Voltages on Anode Supported Button SOFCs
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DOI：10.1149/04529.0205ecst.png)
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Abstract
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The three-point electrode method is believed to be unsuitable for isolating the cathode or anode performance in electrode-supported button Solid Oxide Fuel Cells (SOFCs). Devising a strategy to use this technique in conjunction with simulations for fruitful testing of anode-supported button cells is a topic of ongoing research. In experiments with reference electrodes on the cathode side of anode-supported SOFCs, potential difference between cathode and reference electrode at open circuit is expected to be 0 mV. However, potential differences of 10 to 50 mV are consistently observed with two types of reference electrodes (silver, LSM/YSZ composite). In this study, two possible reasons are explored for this discrepancy: fuel leakage and double layer effects. Plausibility of the hypothesized causes is tested using numerical simulations of the test apparatus and potential distribution inside the button cell. Initial results show that a combination of these factors could be responsible for the observed anomalies.
Keywords:
REFERENCE ELECTRODE
IMPEDANCE SPECTROSCOPY
SOLID-ELECTROLYTE
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