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Impedance studies on LSCM/GDC composite cathode for high temperature CO2 electrolysis

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Abstract

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. The main feature in the impedance of LSCM/GDC is that it showed a Gerischer like impedance dispersion at 900°C in all CO2-CO mixtures investigated here. The Rs of LSCM/GDC changes little with the variations in CO 2/CO ratio and operating voltage, however, the Rp of LSCM/GDC composite reduces with increasing CO concentration and operation potential. The activation energy for area specific resistance and for cathode polarization resistance is ∼58 and 72 kJ mol-1 in CO2/CO 70/30 fUel, respectively. The surface adsorption/desorption equilibration and/or surface diffusion processes play a dominant role in the electrochemical reduction of CO2 by SOEC.

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Original languageEnglish
Title of host publicationElectrochemical Synthesis of Fuels 1
Pages87-95
Number of pages9
Volume41
Edition33
DOIs
Publication statusPublished - 1 Dec 2012
Event1st International Symposium on Electrochemical Synthesis of Fuels, ESF 2011 - 220th ECS Meeting - Boston, MA, United States
Duration: 9 Oct 201114 Oct 2011

Conference

Conference1st International Symposium on Electrochemical Synthesis of Fuels, ESF 2011 - 220th ECS Meeting
CountryUnited States
CityBoston, MA
Period9/10/1114/10/11

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