Gas Composition Analysis on Ni-YSZ Anode in Direct Internal Reforming Solid Oxide Fuel Cell

Abstract

Direct internal reforming SOFCs have attracted a lot of interest due to high energy conversion efficiency and simple system configuration. In this study, the distribution of gas composition over the anode surface along the gas flow direction was directly analyzed by gas chromatograph under the open-circuit and discharge conditions with a supply of methane fuel. Regardless of total flow rate, a remarkable increase in methane conversion was confirmed at the upstream part under a constant fuel composition in open-circuit condition. The extent of conversion enhancement was more significant at slower flow rates. The gas–catalyst contacting time determined the methane conversion. The enhancement of methane conversion with an increase in current density was confirmed. The methane reforming was promoted by the consumption of hydrogen and the formation of steam via the electrochemical reaction.