Enhanced Oxygen Reduction Activity on Ruddlesden-Popper Phase Decorated La0.8Sr0.2FeO3-δ3D Heterostructured Cathode for Solid Oxide Fuel Cells.
A new heterostructured (La,Sr)2FeO4-δ(LSF214)-La0.8Sr0.2FeO3-δ(LSF113) electrode has been synthesized to improve the oxygen reduction reaction (ORR). This new materials system was fabricated by the deposition of Sr(NO3)2into the LSF113framework followed by subsequent heat treatment, resulting in a new three-dimensional (3D) LSF214-LSF113heterostructured electrode. This material system consists of a with Ruddlesden-Popper (R-P) LSF214phase formed on the surface of the LSF113framework. The ORR activity has been enhanced by 1 order of magnitude using the LSF214-LSF113heterostructured electrode. The ORR enhancement was the result of higher catalytic activity of the LSF214phase and a mismatch in the lattice parameter between LSF214and LSF113regions which results in oxygen molecule adsorption and oxygen vacancy formation become more favered. Impedance spectroscopy measurements revealed that the presence of LSF214reduced the polarization resistance of the LSF113electrode on a ceria-based electrolyte. The high frequency resistance (RH) and low frequency resistance (RL) decreased substantially due to the enhanced oxygen transport process and accelerated oxygen incorporation rate in the LSF214-LSF113heterostructured electrode. The heterostructured LSF214-LSF113electrode provides a promising new approach to improve the oxygen reduction reaction activity through multiphase materials systems with tailored microstructures.
CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China , Hefei, Anhui 230026, China.|Department of Materials Science and Engineering, Clemson University , Clemson, South Carolina 29634, United States.
Tao
T
Hong
Department of Materials Science and Engineering, Clemson University , Clemson, South Carolina 29634, United States.
Mingyang
M
Zhao
Department of Materials Science and Engineering, Clemson University , Clemson, South Carolina 29634, United States.
Kyle
K
Brinkman
Department of Mechanical Engineering, University of South Carolina , Columbia, South Carolina 29208, United States.
Fanglin
F
Chen
CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China , Hefei, Anhui 230026, China.
Changrong
http://orcid.org/0000-0002-4254-1425
C
Xia
Ruddlesden−Popper phase; lanthanum strontium ferrite; oxygen reduction reaction; oxygen surface exchange; solid oxide fuel cell