Back to Search
Start Over
Enhancement of the electrocatalytic activity of La0.6Sr0.4Co0.2Fe0.8O3-δ through surface modification by acid etching
- Publication Year :
- 2021
- Publisher :
- ELSEVIER SCIENCE BV, 2021.
-
Abstract
- The surface properties of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) perovskite electrode are modified with HNO3 treatment to improve its catalytic activity towards oxygen reduction reaction between 500–650 °C. The surface concentrations of A-site cations are reduced after the acid etching. After the calcination at 1150 °C, severe segregation of Sr is observed on the surface of untreated LSCF powder, which is suppressed remarkably with the HNO3 pretreatment. Highly reactive oxygen species and Fe4+ species are formed on the surface of LSCF after the HNO3 treatment, which are beneficial to oxygen reduction reaction. The reduction of oxygen species adsorbed on the LSCF surface, the rate-determining step of the electrode process, is accelerated significantly with the acid etching.
- Subjects :
- lanthanum strontium cobalt ferrite
Inorganic chemistry
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
01 natural sciences
Oxygen
Catalysis
law.invention
chemistry.chemical_compound
Adsorption
law
solid oxide fuel cell
Calcination
Perovskite (structure)
oxygen reduction reaction
Chemistry
General Chemistry
021001 nanoscience & nanotechnology
Sr segregation
0104 chemical sciences
Lanthanum strontium cobalt ferrite
Electrode
Surface modification
0210 nano-technology
surface modification
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....24667a525b220be510162c0232117673