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(La,Sr)(Cr,Mn)O 3/GDC cathode for high temperature steam electrolysis and steam-carbon dioxide co-electrolysis

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Abstract

A composite of (La,Sr)(Cr,Mn)O 3/(Gd,Ce)O 2 (LSCM/GDC) was evaluated as a cathode in a high temperature solid oxide electrolysis cell (SOEC) used for steam electrolysis and/or steam-carbon dioxide co-electrolysis. When the steam feed rate was smaller than 30 ml/min, the LSCM/GDC cathode is subject to large diffusion resistance from inadequate steam supply at steam concentration of 3-20%. Sigmoidal shaped I-V curves were thus observed for steam electrolysis, unlike when CO 2 was present during reduction where smooth I-V characteristics were observed. With respect to steam-carbon dioxide co-electrolysis, the LSCM/GDC cathode showed lower performance than for CO 2 electrolysis, due to insufficient steam content at a feed of 20% H 2O-5% H 2/Ar (10 ml/min) and CO 2/CO 70/30 (20 ml/min) mixture.

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Original languageEnglish
Pages (from-to)131-135
Number of pages5
JournalSolid State Ionics
Volume225
DOIs
Publication statusPublished - 4 Oct 2012

    Research areas

  • Co-electrolysis, LSCM/GDC cathode, Polarization resistance, SOEC, Steam transport

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