Abstract
High temperature water splitting through solid oxide cells (SOCs) has fundamental advantage in efficiency and rate over its low temperature counterparts. However, fast performance degradation of high temperature SOCs is a major challenge to scale up the technology to the hydrogen market. One leading cause for the degradation is the delamination of oxygen electrode (OE) under high current densities. In this presentation, we show our effort to determine critical conditions under which OE can safely operate without delamination. We particularly apply DC-biased electrochemical impedance spectroscopy (EIS) method to a three-electrode symmetrical cell to delineate OE polarization resistance RP and overpotential h as a function of current density and time under both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). We then correlate exchange current density (io) with the time of delamination using ohmic resistance Rohm as an indicator of delamination, from which the boundary that OE can safely operate without delamination is established for SOC-based electrolyzers operation.
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