Spinel-based oxide cathode used for high temperature CO2/H2O co-electrolysis
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-el...
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Published in | Solid state ionics Vol. 329; pp. 46 - 51 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.01.2019
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Subjects | |
Online Access | Get full text |
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Summary: | 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.
•Spinel oxides applied as cathodes in high temperature co-electrolyser•CuFe2O4 performs reversible I-V curves with stable CO and H2 production.•CuFe2O4 cell presents superior Coulombic (Faradaic) efficiency.•Significant microstructural modification after co-electrolysis |
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ISSN: | 0167-2738 1872-7689 |
DOI: | 10.1016/j.ssi.2018.11.008 |