Enhanced CO2 electrolysis with a SrTiO3 cathode through a dual doping strategy

The significant role of perovskite defect chemistry through A-site doping of strontium titanate with lanthanum for CO2 electrolysis properties is demonstrated. Here we present a dual strategy of A-site deficiency and promoting adsorption/activation by making use of redox active dopants such as Mn/Cr...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019-01, Vol.7 (6), p.2764-2772
Main Authors: Ye, Lingting, Hu, Xiuli, Wang, Xin, Chen, Fanglin, Tang, Dian, Dong, Dehua, Xie, Kui
Format: Article
Language:English
Subjects:
Activated carbon
Carbon dioxide
Cathodes
Doping
Electrode materials
Electrolysis
High temperature
Infrared spectroscopy
Lanthanum
Organic chemistry
Oxygen
Perovskites
Strategy
Strontium
Strontium titanates
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Summary:The significant role of perovskite defect chemistry through A-site doping of strontium titanate with lanthanum for CO2 electrolysis properties is demonstrated. Here we present a dual strategy of A-site deficiency and promoting adsorption/activation by making use of redox active dopants such as Mn/Cr linked to oxygen vacancies to facilitate CO2 reduction at perovskite titanate cathode surfaces. Solid oxide electrolysers based on oxygen-excess La0.2Sr0.8Ti0.9Mn(Cr)0.1O3+δ, A-site deficient (La0.2Sr0.8)0.9Ti0.9Mn(Cr)0.1O3−δ and undoped La0.2Sr0.8Ti1.0O3+δ cathodes are evaluated. In situ infrared spectroscopy reveals that the adsorbed and activated CO2 adopts an intermediate chemical state between a carbon dioxide molecule and a carbonate ion. The double strategy leads to optimal performance being observed after 100 h of high-temperature operation and 3 redox cycles, suggesting a promising cathode material for CO2 electrolysis.
ISSN:2050-7488
2050-7496
DOI:10.1039/c8ta10188d