This study reports the micro-structural and electrochemical properties of metal-supported solid oxide fuel cells (MS-SOFCs) with an La0.8Sr0.2MnO3-d (LSM) /8 mol % yttria-stabilized zirconia (8YSZ) composite cathode, fabricated at room temperature using the aerosol deposition process (ADP). The composite cathode fabricated with the ADP technique shows uniform distribution of components and pores and the interface between the cathode and the electrolyte displays excellent joining properties. The area specific resistance (ASR) of the ADP-LSM/8YSZ sample is approximately 1.50 Ω•cm2 at 800 oC, so this sample shows a significantly lower ASR value than the values usually reported for samples fabricated by the in-situ treatment method for MS-SOFCs. The power density of the cells with the ADP-LSM/8YSZ cathode coated on MS-SOFCs shows a maximum value of 0.38 mW•cm-2 at 800 °C and stable performance in the severe thermal durability test. Therefore, these research results can broaden the opportunities for adoption of the ADP coating processes to fabricate cathode materials in MS-SOFCs.
In this study, the chemical states of a powder type and an impregnated type of the La 0.4 Sr 0.6 Ti 0.8 Mn 0.2 O 3±d (LSTM) oxide system were investigated along with its electrical conductivities in order to apply these materials as alternative anode materials for high temperature-operating Solid Oxide Fuel Cells (HT-SOFCs).The Ni / 8YSZ samples with LSTM impregnated into the pores created by partially removing nickel, Ni / 8YSZ ( Ni (R) / 8YSZ), showed much higher electrical conductivity values than those of unimpregnated Ni / 8YSZ (Ni (E) / 8YSZ) samples under dry H 2 fuel condition.
Reduction of Mn4+ to Mn 3+ was observed when LSTM was reduced. Additional reduction properties of Mn 2+ from Mn 3+ and satellite peaks were found when impregnated LSTM was coated onto a Ni / 8YSZ substrate. The reduction of the charge state of Ti contained in LSTM showed the same behavior as the reduction property of Mn. However, a satellite peak identified as metal Ti was only observed when impregnated LSTM was coated on a selectively Niremoved Ni / 8YSZ ( Ni (R) / 8YSZ) substrate.
The microstructural and electrochemical properties of anodes obtained by impregnation of the La0.4Sr0.6Ti0.8Mn0.2O3±d (LSTM) oxide system into two types of anode substrates such as Ni / 8YSZ substrate (Ni (E) / 8YSZ) and partially Ni removed Ni / 8YSZ substrate (Ni(R)/8YSZ) were investigated in order to apply them as anode material for solid oxide fuel cells.All of the samples with LSTM impregnated on Ni (R) / 8YSZ show higher electrical conductivity values than those of unimpregnated Ni (E) / 8YSZ under dry H2 condition.The highest electrical conductivity values of 2041.2, 1877.4, and 1764.3 S/cm at 700, 800 and 900 o C can be achieved by samples with 3 wt% impregnated LSTM on Ni (R) / 8YSZ. From the XPS analysis, the existence of a Ti metal peak on the surface of LSTM was only measured for the LSTM (3wt%)-Ni (R) / 8YSZ sample, metallic titanium on the surface can improve the electrical catalytic reaction. LSTM (3wt%)-Ni (R) / 8YSZ showed higher electrical conductivity values then those of LSTM (3wt%)-Ni (E) / 8YSZ in all the temperature ranges measured in the case of dry CH4 supply. Finally, the electrical conductivity of LSTM (3wt%)-Ni (R) / 8YSZ was stably maintained even when exposed to dry CH4 condition at 900 o C for a long time (100 hours).
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