Synthesis and applications of composite cathode based on Sm0.5Sr0.5Co3−δ
for solid oxide fuel cell |
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Authors: | Young Min Park Haekyoung Kim |
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Affiliation: | 1. Fuel Cell Project, Research Institute of Industrial Science and Technology, Pohang, 790-330, Korea 2. School of Materials Science & Engineering, Yeungnam University, Gyeongsan, 712-749, Korea
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Abstract: | Cobaltite based perovskites, such as Sm0.5Sr0.5Co3?δ (SSC), are attractive solid oxide fuel cell (SOFC) cathodes due to their high electrochemical activity and electrical conductivity. To obtain higher fuel cell performance with smaller particles, nano-sized SSC powders were synthesized by a complex method with/without carbon black, HB170. However, during synthesis, carbon black reacted with Sr, and unfortunately formed SrCO3. To obtain pure perovskite SSC, a calcination temperature of 900 °C is needed. At 680 °C, an SOFC with SSC (calcined at 700 °C and synthesized without HB170) exhibited a higher fuel cell performance, of 0.68W·cm?2, than that with SSCHB (calcined at 900 °C and synthesized with HB170), of 0.58W·cm?2. Adding GDC for composite cathode is more effective in SSCHB porous cathodes than in SSC porous cathodes. At 680 °C, the composite cathode of SSCHB6-GDC4 exhibited the highest maximum power density of 0.72W·cm?2 which results from the combined effects of lowered charge transfer polarization and mass transfer polarization. To obtain higher fuel cell performance, optimum composition and processes are necessary. |
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