Strontium-doped samarium cobaltite Sm0



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tarix05.03.2018
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#30007

Fabrication of Sm0.5Sr0.5CoO3 cathode thin films for IT-SOFC by Electrostatic Spray Depositon

Inyu Park, Jongmo Im, Sungeun Jang and Dongwook Shin*

Division of Material Science & Engineering, Hanyang University

17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Korea

*Corresponding author: dwshin@hanyang.ac.kr

Abstract

Strontium-doped samarium cobaltite (Sm0.5Sr0.5CoO3, SSC) has good electrochemical properties for intermediate-temperature solid oxide fuel Cells (IT-SOFCs) because it has mixed-conduction characteristics which are electronic and ionic conductivities. It has higher ionic conductivities than other cathode materials for SOFCs such as LSM and LSGM. Electrostatic Spray Deposition (ESD) method has some advantages such as simple apparatus, convenience of controlling microstructure of thin films and variety of choice of precursor solution.



In this study, the ESD method was applied to fabricate porous SSC thin films for a SOFC cathode. Samarium chloride hexahydrate (SmCl3·6H2O), strontium chloride hexahydrate (SrCl2·6H2O), cobalt nitrate hexahydrate (Co(NO3)2·6H2O) as starting materials and methyl alcohol as solvent were used to make precursor solution. The porous SSC films were deposited on Si substrate and the microstructure was dependent on processing parameters such as substrate temperature, distance from nozzle to substrate, applied voltage and flow rate of a syringe. Scanning Electron Microscope (SEM) and X-ray Diffractometer (XRD) measurement were used to investigate the microstructure and crystallinity of the SSC films. The ESD technique is shown to be an efficient method in which SOFCs’ cathode film can be fabricated with tailoring of the desired phases and microstructure.
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