Spinel-based oxide cathode used for high temperature CO2/H2O co-electrolysis

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Spinel oxides are applied as cathodes (fuel electrode) for the high temperature co-electrolysis of CO2/H2O mixtures. The spinel oxide is composed of two transition metals, which may improve activity for the reduction of CO2 and H2O. A series of spinel oxides have been synthesized and tested in co-electrolysis mode. A good candidate, CuFe2O4, was found and achieved a current density higher than 1 A/cm2 in CO2/H2O co-electrolysis with a fuel composition of 30%CO2/30%H2O-Ar at 800 °C, although the product was enriched in H2. This material presents superior Coulombic (Faradaic) efficiency for CO + H2 gas products, reaching more than 95%. It shows stable and reversible I-V curves, indicating good electrochemical cell performance in the co-electrolysis operation. In addition, a uniform porous structure with fine particles was observed after co-electrolysis, which may be associated with the stable and reversible electrochemical cell performance observed.

Original languageEnglish
Pages (from-to)46-51
Number of pages6
JournalSolid State Ionics
Publication statusPublished - Jan 2019

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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