Coking resistant Ni–La0.8Sr0.2FeO3 composite anode improves the stability of syngas-fueled SOFC

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-02-26
Major/Subject
Mcode
Degree programme
Language
en
Pages
9
9809-9817
Series
International Journal of Hydrogen Energy, Volume 46, issue 15
Abstract
An improved SOFC anode with excellent stability against carbon deposition with syngas as fuel is reported. The anode material is Ni–La0.8Sr0.2FeO3 (LSF) composite synthesized by anhydrous impregnation. After reduction in wet H2 (3% H2O), the material partially decomposes to SrLaFeO4 and exsolved Fe. The exsolved Fe forms Ni–Fe alloy with impregnated Ni. The particle size of Ni–Fe alloy is about 20–50 nm. The Ni–Fe alloy nanoparticles disperse on the surface of the La0.8Sr0.2FeO3 and SrLaFeO4 oxides. The increase of Ni content promotes the exsolution of Fe and increases the reaction sites of Ni–Fe alloy. With the increase of the Ni content, the electrical conductivity and catalytic activity are enhanced, which improves the electrochemical performance of the single cell. The cell with 10 mol.% Ni impregnated Ni-LSF as anode achieves a maximum power density of 550 mW cm−2 at 700 °C fueled with syngas. The strong interaction of the nano-sized Ni–Fe alloy with the LaxSryFeOz (La0.8Sr0.2FeO3 or SrLaFeO4) oxide substrate efficiently suppresses carbon deposition with high graphitization degree. Besides, the SrLaFeO4 phase which can accommodate interstitial oxygen facilitates the removal of the deposited carbon.
Description
Keywords
Anode, Coking, Exsolution, Perovskite, Solid oxide fuel cell, Syngas
Other note
Citation
Yao, X, Asghar, M I, Zhao, Y, Li, Y & Lund, P D 2021, ' Coking resistant Ni–La 0.8 Sr 0.2 FeO 3 composite anode improves the stability of syngas-fueled SOFC ', International Journal of Hydrogen Energy, vol. 46, no. 15, pp. 9809-9817 . https://doi.org/10.1016/j.ijhydene.2020.06.091