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Highly Efficient CO2 Electrolysis on Cathodes with Exsolved Alkaline Earth Oxide Nanostructures
- Source :
- ACS Applied Materials & Interfaces. 9:25350-25357
- Publication Year :
- 2017
- Publisher :
- American Chemical Society (ACS), 2017.
-
Abstract
- The solid oxide CO2 electrolyzer has the potential to provide storage solutions for intermittent renewable energy sources as well as to reduce greenhouse gas emissions. One of the key challenges remains the poor adsorption and activity toward CO2 reduction on the electrolyzer cathode at typical operating conditions. Here, we show a novel approach in tailoring a perovskite titanate (La, Sr)TiO3+δ cathode surface, by the in situ growing of SrO nanoislands from the host material through the control of perovskite nonstoichiometry. These nanoislands provide very enhanced CO2 adsorption and activation, with stability up to 800 °C, which is shown to be in an intermediate form between carbonate ions and molecular CO2. The activation of adsorbed CO2 molecules results from the interaction of exsolved SrO nanoislands and the defected titanate surface as revealed by DFT calculations. These cathode surface modifications result in an exceptionally high direct CO2 electrolysis performance with current efficiencies near 100%.
- Subjects :
- Electrolysis
Alkaline earth metal
Materials science
Nanostructure
Inorganic chemistry
Oxide
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Cathode
Titanate
0104 chemical sciences
law.invention
chemistry.chemical_compound
Adsorption
chemistry
law
General Materials Science
0210 nano-technology
Perovskite (structure)
Subjects
Details
- ISSN :
- 19448252 and 19448244
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- ACS Applied Materials & Interfaces
- Accession number :
- edsair.doi...........0e8755185faa71e5439237b865267150