Investigation of LSM/8YSZ cathode within an all-ceramic SOFC, Part II: Optimization of performance and co-sinterability. Issue 10 (August 2020)

• Record Type: Journal Article
• Authors: Harboe, S.; Lupetin, P.; Guillon, O.; Menzler, N.H.
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 10(2020)
• Page Start: 3618
• Page End: 3631
• Publication Date: 2020-08
• Subjects: 8YSZ 8 mol% yttria-stabilized zirconia -- BET Brunauer–Emmett–Teller -- BSD back scatter electron detector -- CCL current collector layer -- CL cathode layer -- EIS electrochemical impedance spectroscopy -- IA image analysis -- LDA laser diffraction analysis -- LSM lanthanum strontium manganite -- SEM scanning electron microscopy -- SOFC solid oxide fuel cell -- SSA specific surface area -- TPB triple phase boundary -- XRD X-ray diffraction; Co-sintering -- Solid oxide fuel cells -- All-ceramic -- Microstructure -- Electrochemical performance; 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.2020.03.010
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: This paper focuses on the cathode and current collector layers of a co-sintered, all-ceramic solid oxide fuel cell (SOFC) concept. Challenges to reach good electrochemical performance have to be overcome, due to more demanding manufacturing conditions, including a relatively high co-sintering temperature. Master sintering curves show that the sintering activity of lanthanum strontium manganite (LSM) is significantly higher than that of 8-mol% yttria stabilized zirconia (8YSZ). By applying a double-layered cathode and a current collector with optimized microstructures the best electrochemical performance of the cathode is 0.26 Ω cm 2 at 800 ° C, evaluated from polarization resistances of 8YSZ electrolyte-supported symmetric cells post-sintered at 1150 ° C < T < 1250 ° C. The cathode and current collector materials are adapted to fit the co-sintering process by adjustment of the paste compositions. Half-cells consisting of silicate mechanical support, LSM current collector, LSM mixed with 8YSZ composite cathode and 8YSZ electrolyte are co-sintered porous and defect-free at 1150 ° C < T < 1250 ° C.