Development and performance of anode material based on A-site deficient Sr2-xFe1.4Ni0.1Mo0.5O6-δ perovskites for solid oxide fuel cells. (10th October 2016)

• Record Type: Journal Article
• Authors: Feng, Jie; Qiao, Jinshuo; Wang, Wenyi; Wang, Zhenhua; Sun, Wang; Sun, Kening
• Is Part Of: Electrochimica acta. Volume 215(2016)
• Page Start: 592
• Page End: 599
• Publication Date: 2016-10-10
• Subjects: A-site deficiency -- Anode -- Perovskite -- Solid oxide fuel cells; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.08.088
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Engineering of A-site deficiency in perovskites can be critical for designing new materials with required functional properties. In this article, A-site deficient Sr2-x Fe1.4 Ni0.1 Mo0.5 O6-δ (x = 0-0.1, Sr2-x FNM) perovskites have been synthesized and characterized as anode materials for solid oxide fuel cells. X-ray photoelectron spectroscopy data indicate that Sr deficiency changes valence states of B-site cations. The introduction of A-site deficiency has shown to improve the chemical stability of the as-prepared materials under reducing conditions. With increasing of Sr deficiency, the conductivity in 5% H2 /Ar increases markedly, reaching a peak value of 26.6 S cm −1 at x = 0.05. While further increasing of x reduces the conductivity by affecting the mobility of electronic charge carriers. The La0.9 Sr0.1 Ga0.8 Mg0.2 O3 electrolyte-supported cell with La0.6 Sr0.4 Fe0.8 Co0.2 O3 cathode and Sr1.95 Fe1.4 Ni0.1 Mo0.5 O6-δ anode demonstrates a maximum power density of 606 mW cm −2 at 800 °C operating in H2 . Such designed A-site deficiency perovskite has the potential to be applied as SOFC anode materials.