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Issue 4, 2015
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Perovskite chromate doped with titanium for direct carbon dioxide electrolysis

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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 La0.75Sr0.25Cr0.5−xFe0.5TixO3−δ (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 CO2 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.

Graphical abstract: Perovskite chromate doped with titanium for direct carbon dioxide electrolysis

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Publication details

The article was received on 30 Oct 2014, accepted on 02 Feb 2015 and first published on 02 Feb 2015


Article type: Paper
DOI: 10.1039/C4NJ01868K
New J. Chem., 2015,39, 2956-2965

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    Perovskite chromate doped with titanium for direct carbon dioxide electrolysis

    W. Yao, T. Duan, Y. Li, L. Yang and K. Xie, New J. Chem., 2015, 39, 2956
    DOI: 10.1039/C4NJ01868K

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