Coking resistant Ni–La0.8Sr0.2FeO3 composite anode improves the stability of syngas-fueled SOFC. (26th February 2021)

• Record Type: Journal Article
• Authors: Yao, Xueli; Asghar, Muhammad Imran; Zhao, Yicheng; Li, Yongdan; Lund, Peter D.
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 15(2021)
• Page Start: 9809
• Page End: 9817
• Publication Date: 2021-02-26
• Subjects: Solid oxide fuel cell -- Anode -- Coking -- Perovskite -- Exsolution -- Syngas; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.06.091
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: An improved SOFC anode with excellent stability against carbon deposition with syngas as fuel is reported. The anode material is Ni–La0.8 Sr0.2 FeO3 (LSF) composite synthesized by anhydrous impregnation. After reduction in wet H2 (3% H2 O), 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 La0.8 Sr0.2 FeO3 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 Lax Sry FeOz (La0.8 Sr0.2 FeO3 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. Highlights: Ni-LSF composite suppresses the Ni aggregation and carbon growth in the anode. The Ni-LSF anode based fuel cell produced 550 mW/ cm −2 at 700 °C. Fuel cell with Ni-LSF anode has better stability than Ni–Fe-SDC based cell.