Effect of argentum on development and properties of composite cathode La0.6Sr0.4Co0.2Fe0.8O3-δ – SDCC-Ag for low temperature solid oxide fuel cell (LTSOFC)

Abu Bakar, Muhamad Subri (2017) Effect of argentum on development and properties of composite cathode La0.6Sr0.4Co0.2Fe0.8O3-δ – SDCC-Ag for low temperature solid oxide fuel cell (LTSOFC). Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Lowering the operating temperature of solid oxide fuel cells (SOFC) has gained much attention in research nowadays. Recently, research on cathode materials focused on composite cathode carbonate with Argentum (Ag) addition which allows outstanding performance at low operating temperature. This study focused on the effect of Ag on development and properties of composite cathode Lanthanum Strontium Cobalt Ferrite-Samarium Doped Ceria Carbonate-Argentum (LSCFSDCC- Ag) for low temperature SOFC (LTSOFC) applications. Composite cathode powders LSCF-SDCC-Ag with Ag addition of 1-5 wt.% has been developed via high energy ball milling (HEBM) technique and sintered at 500-600˚C. The characterisation of the composite cathode powders involved the XRD analysis to determine the chemical compatibility and crystallite structure of the composite cathode powders. The morphology and distribution of elements in powder were observed via FESEM and EDS respectively. Analysis to investigate the physical properties such as particle size, crystallite size, porosity and cross section of pellets were employed. Thermal properties such as TEC and TG were also identified. The resistance of composite cathode pellets were measured via two-probe electrical test at temperature 400-600˚C. All the composite cathode powders with Ag addition from 1-5wt.% and sintered between 500-600˚C exhibited good chemical compatibility as there were no secondary constituent was detected via XRD sensitivity. The carbonate phase managed to maintain their phase as confirmed via FTIR and TG analysis. The crystallite size and particle size was increase with increasing of Ag amount meanwhile the porosity decrease with increasing amount of Ag and sintering temperature. LSCF-SDCC-Ag 5wt.% sintered at 600˚C, 2wt.% sintered at 550˚C and 3wt.% sintered at 600˚C recorded the nearest average TEC value with SDCC with percentage difference of 0.3%, 3.0% and 4.5% respectively, while the sintering temperature of 550˚C shows consistency and nearly TEC value of composite cathode LSCF-SDCC-Ag towards electrolyte SDCC. Composite cathode LSCF-SDCC-Ag (2 wt.%) sintered at 550˚C yielded the lowest resistance amongst all. Hence, it was concluded that the composite cathode LSCF-SDCC-Ag with Ag addition of 2 wt.% sintered at 550˚C in which demonstrate lowest resistance (0.61Ω) and within acceptable average TEC value (9.74±4.98 (10-6/K)) with electrolyte SDCC (10.20±6.27(10-6/K)) potentially to be served as composite cathode for low temperature SOFC applications.

Item Type:Thesis (Masters)
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2896-2986 Production of electricity by direct energy conversion
ID Code:9937
Deposited By:Mr. Mohammad Shaifulrip Ithnin
Deposited On:01 Apr 2018 11:57
Last Modified:01 Apr 2018 11:57

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