Preparation and Properties of Fe-Based Double Perovskite Oxide as Cathode Material for Intermediate-Temperature Solid Oxide Fuel Cell

Preparation and Properties of Fe-Based Double Perovskite Oxide as Cathode Material for Intermediate-Temperature Solid Oxide Fuel Cell

Double perovskite oxides with mixed ionic and electronic conductors (MIECs) have been widely investigated as cathode materials for solid oxide fuel cells (SOFCs). Classical Fe-based double perovskites, due to their inherent low electronic and oxygen ionic conductivity, usually exhibit poor electroca...

Full description

Saved in:
Bibliographic Details
Main Authors: Liangmei Xue, Songbo Li, Shengli An, Ning Li, Huipu Ma, Mengxin Li
Format: Article
Language:English
Published: MDPI AG 2024-11-01
Series:Molecules
Subjects:
IT-SOFC
Fe-based
Mo doping
electrochemical performance
Online Access:https://www.mdpi.com/1420-3049/29/22/5299
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Double perovskite oxides with mixed ionic and electronic conductors (MIECs) have been widely investigated as cathode materials for solid oxide fuel cells (SOFCs). Classical Fe-based double perovskites, due to their inherent low electronic and oxygen ionic conductivity, usually exhibit poor electrocatalytic activity. The existence of various valence states of B-site ions modifies the material’s catalytic activity, indicating the possibility of the partial substitution of Fe by higher-valence ions. LaBaFe<sub>2−x</sub>Mo<sub>x</sub>O<sub>5+δ</sub> (<i>x</i> = 0, 0.03, 0.05, 0.07, 0.1, LBFM<sub>x</sub>) is used as intermediate-temperature solid oxide fuel cell (IT-SOFC) cathode materials. At a doping concentration above 0.1, the Mo substitution enhanced the cell volume, and the lattice expansion caused the formation of the impurity phase, BaMoO<sub>4</sub>. Compared with the parent material, Mo doping can regulate the oxygen vacancy concentration and accelerate the oxygen reduction reaction process to improve the electrochemical performance, as well as having a suitable coefficient of thermal expansion and excellent electrode stability. LaBaFe<sub>1.9</sub>Mo<sub>0.1</sub>O<sub>5+δ</sub> is a promising cathode material for IT-SOFC, which shows an excellent electrochemical performance, with this being demonstrated by having the lowest polarization resistance value of 0.017 Ω·cm<sup>2</sup> at 800 °C, and the peak power density (PPD) of anode-supported single-cell LBFM<sub>0.1</sub>|CGO|NiO+CGO reaching 599 mW·cm<sup>−2</sup>.
ISSN:1420-3049

Similar Items