Impedance Study of Anodic Properties of Ni-Fe Impregnated SDC. (2nd June 2015)

• Record Type: Journal Article
• Authors: Itagaki, Yoshiteru; Takemasa, Tomohisa; Yamaguchi, Syuhei; Yahiro, Hidenori
• Is Part Of: ECS transactions. Volume 68:Number 1(2015)
• Page Start: 1427
• Page End: 1434
• Publication Date: 2015-06-02
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/06801.1427ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : Bimetallic Ni1-x Fex /SDC powders containing 20wt% Ni-Fe were prepared and their anodic properties for SOFC were evaluated. The impedance spectra of the Ni1-x Fex /SDC anodes at 800 o C consisted of the ohmic component, R ohmic, and depressed arcs, R HF and R LF . The R ohmic component was due to the solid electrolyte layer, (ScO1.5 )0.18 (CeO2 )0.01 (ZrO2 )0.81 . The R HF component was significantly reduced by the Fe addition, but apparent dependence was not observed for the R LF component. The x=0.5 composition possessed the small R HF and R LF values. Accordingly, the single cell performance at 800 o C was the maximum at x=0.5, and that was in the order of x=0.5 ~ 0.2 > 0.8 ~ 0 >1.0. The mean crystallite size of Ni-Fe alloy increased approximately in this order. Therefore, we obtained conclusion that the Fe addition to Ni would decrease the particle size of Ni-Fe alloy, resulting in the enhancement of the catalytic activity of Ni1-x Fex /SDC anode.