Performance of a ten-layer reversible Solid Oxide Cell stack (rSOC) under transient operation for autonomous application

By Preininger, Michael; Stoeckl, Bernhard; Suboti?, Vanja; Mittmann, Frank; Hochenauer, Christoph
Published in Applied Energy 2019

Abstract

A state-of-the-art ten-layer solid oxide stack was electrochemically characterized and system-oriented experimentally investigated in reversible operation. The stack in question consists of 5YbSZ electrolyte supported planar cells promising high performance. The stack is integrated into a stackbox and is considered to be operated in an autonomous system, thus system-relevant operating conditions in terms of reversibility, inlet mixtures and temperatures were applied. A high fuel utilization, respectively reactant conversion of 80% in either mode was deployed in steady state experiments in a transient operation regime. Polarization curves were dynamically recorded and electrochemical impedance spectroscopy was performed to evaluate the performance of the stack in reversible operation feeding hydrogen and/or carbonaceous gases. Recorded temperature profiles obtained by means of thermocouples placed directly on the air electrodes showed distinct characteristics with a maximum deviation of 24.8 K in the exothermic and 14.9 K in the endothermic operating mode. The stack showed a small dependency on the applied operating temperatures of 780, 800, and 820

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