Novel coatings for protecting solid oxide fuel cell interconnects against the dual-atmosphere effect

卷:48

Article

关键词: FERRITIC STAINLESS-STEEL;    FE-16CR ALLOY INTERCONNECT;    OXIDATION BEHAVIOR;    CORROSION BEHAVIOR;    HYDROGEN PERMEATION;    CHROMIUM VAPORIZATION;    SELECTIVE OXIDATION;    SCALE FORMATION;    WATER-VAPOR;    SOFC;   

DOI  :  10.1016/j.ijhydene.2023.01.313

来源: SCIE

【 摘 要 】

A key component of a Solid Oxide Fuel Cell (SOFC) is the interconnect, which connects individual fuel cells in series to form a fuel cell stack to reach a desired electrical potential. The interconnect is exposed to air and fuel in parallel, these so-called dual-atmosphere conditions give rise to especially severe corrosion on the air-side. This work investigates coatings to mitigate this effect. Physical Vapour Deposition (PVD) CeCo-coated AISI 441 samples on the air-side and PVD metallic Al-and Al2O3-coated AISI 441 samples on the fuel-side were exposed under dual-atmosphere conditions for up to 7000 h. The evolution of the corrosion products was followed every 1000 h with an optical microscope. Scanning electron microscopy and energy-dispersive x-ray spectroscopy were performed on cross -sections of the samples after 3000 h of exposure. The SEM analysis showed that coating on the air-side improved the sample's life-time by reducing the level of Cr evaporation even in a dual-atmosphere. The use of fuel-side coatings suppressed the dual-atmosphere effect since the coatings formed a barrier to hydrogen permeation. The best results were observed with metallic Al and Al2O3 coating on the fuel-side, which drastically reduced the dual-atmosphere effect. However, the poor conductivity of Al2O3 makes its use as a coating challenging. (c) 2023 The Author(s). Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC. This is an open access article under the CC BY license (http://creativecommons.org/ licenses/by/4.0/).

【 授权许可】

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