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Modifying defect structures at interfaces for high-performance solid oxide fuel cells
- Source :
- Journal of the European Ceramic Society. 40:3089-3097
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Oxygen vacancies are important charged defects in oxide ion conductors for oxygen reduction reactions (ORR). They are important reaction sites because of their high oxygen exchange, incorporation ability, and ionic transport reactivity. Herein, to control the defect concentration on the Gd0.1Ce0.9O2-δ (GDC) scaffold, the interface between the electrolyte and the electrode was engineered by a wet-chemical-based infiltration technique which constructed the conformal thin-film-like GDC interlayer (10 nm thickness) with smaller grain size than that of the GDC scaffold. X-ray photoelectron spectroscopy revealed the enriched oxygen vacancies in the infiltrated GDC interlayer with a reduced valence state of Ce. ORR kinetics was substantially improved with the infiltrated GDC interlayer, exhibiting a ∼2-fold decrease in polarization resistance and ∼1.41-fold increase in peak power density (0.072 Ωcm2 and ∼780 mW/cm2, respectively) at 650 °C. The defect structures at the interfaces and enhanced performance remained unchanged for 200 h at 650 °C.
- Subjects :
- 010302 applied physics
Materials science
Valence (chemistry)
Oxide
chemistry.chemical_element
Ionic bonding
02 engineering and technology
Electrolyte
021001 nanoscience & nanotechnology
01 natural sciences
Oxygen
chemistry.chemical_compound
X-ray photoelectron spectroscopy
chemistry
Chemical engineering
0103 physical sciences
Electrode
Materials Chemistry
Ceramics and Composites
0210 nano-technology
Polarization (electrochemistry)
Subjects
Details
- ISSN :
- 09552219
- Volume :
- 40
- Database :
- OpenAIRE
- Journal :
- Journal of the European Ceramic Society
- Accession number :
- edsair.doi...........0ceeaf0db61c11f85b106ad7b64b593a
- Full Text :
- https://doi.org/10.1016/j.jeurceramsoc.2020.03.009