Electrochemical Characteristics and Gas Composition Generated by La0.8Sr0.2Cr0.5Mn0.5O3–δ Cathode at Electrolysis and Co-Electrolysis Modes. Issue 11 (1st January 2016)

• Record Type: Journal Article
• Authors: Lillmaa, Kadi; Maide, Martin; Kanarbik, Rait; Nurk, Gunnar; Lust, Enn
• Is Part Of: Journal of the Electrochemical Society. Volume 163:Issue 11(2016)
• Page Start: F3190
• Page End: F3196
• Publication Date: 2016-01-01
• Subjects: co-electolysis -- LSCM -- SOEC; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0261611jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Ceramic materials with perovskite structure have recently attracted attention as possible redox stable, sulfur- and carbon tolerant cathode materials for solid oxide electrolysis cells. In this study ceramic SOE single cell was fabricated using impregnation method. La0.8 Sr0.2 Cr0.5 Mn0.5 O3–δ -Zr0.94 Sc0.06 O2–δ cathode was activated with CeO2 and Pd nanoparticles and investigated as potential solid oxide co-electrolysis cell cathode at various working temperatures, cell potentials and inlet gas compositions. Based on the electrochemical measurements data the single cell performed the same in co-electrolysis and water electrolysis modes having total polarization resistance 0.52 Ω cm 2 (at 750°C at 1.3 V). Analysis of gas chromatography data shows that the ratio between produced H2 and CO gases decreased with increase of temperature, from 10.5 to 0.76 at 650°C and 800°C, respectively. Also the H2 /CO ratio decreased with steam content in inlet gas.