Effect of Microstructure on Electrochemical Performance of Nano-Structured La0.8Sr0.2Co0.2Fe0.8O3-δ-Gd0.2Ce0.8O1.9 Composite Cathodes. (10th July 2019)

• Record Type: Journal Article
• Authors: Li, Dong; Liu, Chaojun; Su, Delin; Dai, Changsong; Xiong, Yueping
• Is Part Of: ECS transactions. Volume 91:Number 1(2019)
• Page Start: 1483
• Page End: 1489
• Publication Date: 2019-07-10
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/09101.1483ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : In this article, the effect of microstructure on the electrochemical performance of LSCF-GDC composite cathode is mainly studied. LSCF-GDC composite cathodes with different morphologies are prepared via electrospinning and infiltration. The LSCF-GDC composite cathodes with nanoparticle structure achieve their best performance at the LSCF/GDC mass ratio of 1:0.18, and the corresponding polarization resistance(Rp ) is 0.12 Ω cm 2 at 750 °C. Similar, 200nm and 280nm nanofiber-structured LSCF-GDC composite cathodes achieve their optimum performance at LSCF/GDC mass ratios of 1:0.30 and 1:0.76, respectively, the corresponding Rp are 0.07 Ω cm 2 and 0.056 Ω cm 2 at 750 °C. On this basis, carbon fibers are used as pore-former to further increase the porosity of composite cathodes. After pore formation, the optimum LSCF/GDC mass ratio of 280nm nanofiber-structured composite cathode reaches to 1:1.01, and the corresponding Rp decreases to 0.045 Ω cm 2 . Arrhenius formula shows that the 280nm nanofiber-structured composite cathodes after pore formation gains the lowest activation energy of 1.27 eV.