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Impedance Studies on LSCM/GDC Cathode for High Temperature CO2 Electrolysis

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Abstract

The cathode performance of LSCM/GDC composite for high temperature CO2 electrolysis has been studied by electrochemical impedance spectroscopy (EIS) measurements in a three-electrode electrolysis cell using Pt paste as current collector. Themain feature of LSCM/GDC cathode is that it showed a Gerischer like impedance dispersion at 900 degrees C in all CO2-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 CO2 by SOEC. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.021203esl] All rights reserved.

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Original languageEnglish
Pages (from-to)B31-B34
Number of pages4
JournalElectrochemical and Solid-State Letters
Volume15
Issue number3
DOIs
Publication statusPublished - 2012

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