Back to Search Start Over

Modifying defect structures at interfaces for high-performance solid oxide fuel cells

Authors :
Jongseo Lee
Seo Ju Kim
Won Young Lee
Mingi Choi
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.

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