Development of functional layers for direct ethanol solid oxide fuel cells

Abstract

Ariana, e minha maior cúmplice Maritta.Meus agradecimentos também vão aos professores e funcionários do IPEN que colaboraram para a realização deste trabalho, pelo auxílio, ensinamentos e análises realizadas.

Shape Control of Ceria Catalytic Supports for Enhanced Ethanol Reforming in Solid Oxide Fuel Cells

“…Sintering of the catalytic layer was carried out at 800 °C for 1 h in air. Further details of the contact configuration and catalytic layer preparation are found elsewhere. , The electrochemical performance of the cell with the Ni/GDC-NR catalytic layer was evaluated at 700 °C in an open flange test setup from Fiaxell SOFC Technologies. Fuel cells were tested under either hydrogen or ethanol using mass flow meters and bubbling a carrier gas (N 2 ) for ethanol vapor in a temperature-controlled and sealed tank.…”

“…However, if ethanol is directly fed into the SOFC, carbon will form due to the high Ni content (>30 vol %) of the state-of-the-art Ni/YSZ anode. − Coke formation on the anode will lead to rapid and irreversible degradation of the fuel cell performance. To overcome such limitation, the addition of a catalytic layer on top of the SOFC anode to promote fuel reforming before it gets in contact with the anode layer has been shown as one of the most promising strategies. − In this configuration, the catalyst can be tailored to ensure the highest possible fuel-to-hydrogen conversion while preserving the high activity of Ni/YSZ for hydrogen electrochemical conversion. Nonetheless, the catalytic material must meet requirements such as high stability in the harsh processing and operating conditions of an SOFC and be compatible with the other materials in the SOFC.…”