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Fecr Gas Diffusion Layer With Surface Modification For Fuel Processing In Direct-methane Solid Oxide Fuel Cells

机译:表面改性的Fecr气体扩散层,用于直接甲烷固体氧化物燃料电池中的燃料处理

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摘要

A solid oxide fuel cell (SOFC) with an Ni-YSZ anode was tested both without and with porous FeCr disk as a gas diffusion layer (GDL) under direct methane feeding. The surface of GDL was modified by coating with YSZ or Ni-YSZ powders. When gold mesh was used as the current collector, the performance of the direct-methane SOFC degraded very quickly. When FeCr GDL was used as the current collector over the anode, the performance became better and stable. Surface modification of GDL increased the current density. Both in GDL and over the anode, the major methane reaction was CH_4 dissociation, which yielded C species. The C species produced in GDL can be removed via gasification by carbon dioxide that forms over the anode. The formation of CO_2 can become the major reaction in the GDL of FeCr + YSZ while that of CO is the major reaction in the GDL of either FeCr or FeCr + Ni-YSZ. The electrochemical oxidation of CO formed in GDL increases the current density. The electrochemical promotion of lattice-oxygen extraction promotes the oxidation of CO and C species over the anode.
机译:在直接供气下,在不带多孔FeCr盘和不带多孔FeCr盘作为气体扩散层(GDL)的情况下,测试了具有Ni-YSZ阳极的固体氧化物燃料电池(SOFC)。通过涂覆YSZ或Ni-YSZ粉末对GDL的表面进行改性。当金网用作集电器时,直接甲烷SOFC的性能会很快下降。当FeCr GDL用作阳极上的集电器时,性能变得更好,更稳定。 GDL的表面改性增加了电流密度。无论是在GDL中还是在阳极上,主要的甲烷反应都是CH_4离解,产生C物质。 GDL中产生的C物质可以通过在阳极上形成的二氧化碳进行气化来去除。 CO_2的形成可能成为FeCr + YSZ的GDL中的主要反应,而CO的形成则是FeCr或FeCr + Ni-YSZ的GDL中的主要反应。 GDL中形成的CO的电化学氧化可增加电流密度。晶格氧萃取的电化学促进促进了阳极上CO和C物种的氧化。

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