Abstract
A method to evaluate current efficiency was developed for high temperature electrolysis using solid oxide cells (SOECs). For a fuel electrode, depending on range, our gas analysis system achieved ±0.4-0.6% uncertainty for 10-90% mole fraction analysis of H2 and H2O. For an air electrode, O2 and N2 was measured with ± 0.2% and ±0.4% uncertainty, respectively. Case studies for both electrodes clarified that current efficiency can be evaluated with ±1.1-2.8% uncertainty at practical 90-50% steam utilizations in the case of ± 1.0% uncertainty in gas-flow-rate measurement.
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