Oxidation of porous stainless steel supports for metal-supported solid oxide fuel cells. (6th November 2020)

• Record Type: Journal Article
• Authors: Reisert, Michael; Berova, Viktoriya; Aphale, Ashish; Singh, Prabhakar; Tucker, Michael C.
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 55(2020)
• Page Start: 30882
• Page End: 30897
• Publication Date: 2020-11-06
• Subjects: Metal-supported -- SOFC -- Oxidation -- Stainless steel; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.08.015
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Oxidation behavior of porous P434L ferritic stainless steel, used for the fabrication of metal-supported solid oxide fuel cells (MS-SOFC), is studied under anodic and cathodic atmospheres. Temperature- and atmosphere-dependence is determined for as-sintered and pre-oxidized stainless steel. Pre-oxidation reduced the long-term oxidation rate. For pre-oxidized samples, the oxidation rate in air exceeds that in humid hydrogen for temperatures above 700 °C. The influence of PrOx, LSCF-SDC, and Ni-SDC coatings is also examined. The coatings do not dramatically impact oxide scale growth. Oxidation in C-free and C-containing anodic atmospheres is similar. Addition of CO2, CH4, and CO to humidified hydrogen to simulate ethanol reformate does not significantly impact oxidation behavior. Cr transpiration in humid air is greatly reduced by the PrOx coating, and a PrCrO3 reaction product is observed throughout the porous structure. A dense and protective chromia-based scale forms on steel samples during oxidation in all conditions. A thin silica enriched oxide layer also forms at the metal-scale interface. In general, the oxidation behavior at 700 °C is found to be acceptable. Highlights: Oxidation of porous stainless steel is studied in air, hydrogen, and reformate. Oxidation behavior is acceptable for metal-supported solid oxide fuel cells. Breakaway oxidation in humid atmospheres is a concern at 600 °C. Coatings suppress Cr evaporation.