Superior La1 ? xSrxCoO3 ? ? ceramic electrode fabrication by {MOCSD} for low-temperature {SOFC} application

By Park, Jun-Sik; Bae, Jiwoong; Hong, Soonwook; Kim, Young-Beom
Published in Surface and Coatings Technology NULL 2017

Abstract

Abstract Metal-organic chemical-solution-deposited lanthanum strontium cobaltite (LSC, La1 ? xSrxCoO3 ? ?) nanoporous thin films were fabricated for use as cathodes for low-temperature solid oxide fuel cells (LT-SOFCs). Electrochemical performance and durability were evaluated under continuous operation by comparing with typical Pt-cathode SOFCs. In the initial stage of operation, {SOFCs} with Pt cathodes showed higher output power density for its superior catalytic activity. However, the overall performance of {SOFCs} with Pt cathodes gradually degraded due to thermal instability, while the performance with {LSC} cathodes remained stable for 10 h of continuous operation. In addition, by taking advantage of wet chemical solution methods, the amount of dopant was systematically varied to investigate its effect on fuel cell performance (La1 ? xSrxCoO3 ? ?, x = 0.4, 0.5, 0.6). The fuel cell sample with the dopant ratio x = 0.5 showed the highest peak power density independent of the operating temperature. This result implies that {LSC} cathodes deposited by chemical solution deposition show better operational durability than Pt cathodes and provided potentiality of replacing precious metal cathode for low-temperature SOFCs.

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