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Muhammed Ali, S. A.
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article
Influence of sintering temperature on the polarization resistance of La0.6Sr0.4Co0.2Fe0.8O3-δ - SDC carbonate composite cathode
Abstract
The effects of sintering temperature of an LSCF-samarium-doped ceria carbonate (SDCC) cathode composite film on itspolarization resistance (Rp) were evaluated in this study. An LSCF-SDCC composite cathode was prepared for cathodefilm development by electrophoretic deposition (EPD). The LSCF-SDCC composite cathode was prepared at 50:50 weightpercentage ratio. An EPD suspension which is based on an organic aqueous solution was used, and a mixture of ethanoland deionized water was used as medium with poly diallyl dimethyl ammonium chloride (PDADMAC) as a dispersingagent. SDCC substrate was used, and EPD was performed on both sides. A symmetrical cell with cathode composite LSCFSDCCfilms on both sides of the substrate was subjected to sintering at five different temperatures (from 550°C to 750°C).A symmetrical cell was painted using silver paste before undergoing electrochemical performance test (air condition), inwhich the impedance, Z data, was measured. The effects of sintering temperature change on element content and film porositywere first investigated by energy-dispersive X-ray spectroscopy, field emission scanning electron microscopy, and J-imageanalysis. Ceramic-based cathode LSCF-SDCC that was sintered at 600°C exhibited the lowest Rp at a value of 0.68 Ω whenoperated at 650°C. This study proved that EPD has potential in developing IT-LT solid oxide fuel cell cathode componentswith high electrochemical performance in terms of Rp values.