Novel lanthanum and cerium coatings on (Ba, Sr)-ferrate cathodes for intermediate-temperature solid oxide fuel cells. Issue 14 (November 2016)

• Record Type: Journal Article
• Authors: Wang, Yao-Ming; Chang, Chia-Ming; Shih, Jing-Shiang; Chang, Horng-Yi
• Is Part Of: Journal of the European Ceramic Society. Volume 36:Issue 14(2016:)
• Page Start: 3433
• Page End: 3440
• Publication Date: 2016-11
• Subjects: Solid oxide fuel cell -- Ba0.5Sr0.5FeO3–δ -- Ce coating -- Triple-phase boundaries; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2016.05.018
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Ba0.5 Sr0.5 FeO3–δ (BSF) and Nb-doped BSF (BSNF) particles were coated with single or combined La and Ce (LC) components by a novel semi-organic solution method. Ce-coated BSF (BSF-x Ce) presented a cubic structure after heat treatment. Sintering BSF-x Ce and BSNF-x LC at 1150 °C for 6 h reduced the grain sizes. Among the coated samples, 3.75 mol% LC-coated BSNF (BSNF-3.75 LC) presented the most significant conductivity increase. AC impedance data indicate that the LC coating decreased the ohmic and diffusion resistances in half-cells with a BSNF-x LC cathode and (La0.75 Sr0.2 Ba0.05 )0.175 Ce0.825 O1.891 (LSBC) electrolyte. The power density of the BSNF-3.75 LC/LSBC/Pt half-cell at 650 °C far exceeds that of BSF/LSBC/Pt at 700 °C. The Ce coating on BSF and LC coating on BSNF provided lattice stability and better BSF cathode-LSBC electrolyte adhesion. LC coating enhanced the cell performance by increasing the triple-phase boundaries (TPBs) in the solid oxide fuel cell (SOFC).