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Perovskite chromate doped with titanium for direct carbon dioxide electrolysis.
- Source :
- New Journal of Chemistry; Apr2015, Vol. 39 Issue 4, p2956-2965, 10p
- Publication Year :
- 2015
-
Abstract
- A composite cathode based on lanthanum chromate has uncovered tremendous potential for direct high temperature electrolysis. Unfortunately, a major setback of insufficient electrocatalytic activity limits the efficient carbon dioxide electrolysis. In this paper, catalytically active Ti is doped to partially replace Cr at the B-site in perovskite La<subscript>0.75</subscript>Sr<subscript>0.25</subscript>Cr<subscript>0.5−x</subscript>Fe<subscript>0.5</subscript>Ti<subscript>x</subscript>O<subscript>3−δ</subscript> (LSCrFT, x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5) to improve the polarization and electrocatalytic property of the cathode materials of the solid oxide electrolyzer. The transition of the dominant mechanism from p-type conduction to n-type conduction is observed for the LSCrFT cathode with the Ti doping level at x = 0.3. The doping of Ti in LSCrFT largely improves the electrode activity and therefore reduces electrode polarization resistance. A high-temperature CO<subscript>2</subscript> electrolysis test demonstrates that the Faraday efficiencies of LSCrFT (x = 0.1) cathodes are enhanced by approximately 30% in contrast to bare LSCrF cathodes at 800 °C. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 39
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 101885200
- Full Text :
- https://doi.org/10.1039/c4nj01868k