The cathode performance of LSCM/GDC composite for high temperature CO 2 electrolysis has been studied by electrochemical impedance spectroscopy (EIS) measurements in a three-electrode electrolysis cell using Pt paste as current collector. The main feature of LSCM/GDC cathode is that it showed a Gerischer like impedance dispersion at 900°C in all CO 2 -CO mixtures investigated here. With increasing CO concentration and operating potential, the Rs changes little whilst, the Rp declines markedly for LSCM/GDC composite cathode. The surface adsorption/desorption equilibration and/or surface diffusion processes play a dominant role in the electrochemical reduction of CO 2 by SOEC.
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Yue et al. (2012) studied this question.
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