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Effect of coatings on long term behaviour of a commercial stainless steel for solid oxide electrolyser cell interconnect application in H2/H2O atmosphere
Affiliation:1. ICB, UMR 6303 CNRS, University of Burgundy, Dijon, France;2. APERAM, Centre de Recherche, Isbergues, France;3. PVDco sarl, Baccarat, France;4. LITEN, CEA, Grenoble, France;5. LECNA, CEA Saclay, Gif sur Yvette, France;1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, PR China;2. Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom;1. Dipartimento di Ingegneria Industriale e Scienze Matematiche, Università Politecnica delle Marche, Via Brecce Bianche, Polo Montedago, 60131 Ancona, Italy;2. ENEA C.R. Casaccia, Via Anguillarese, 00123 Rome, Italy;3. The University of Edinburgh, School of Engineering, Institute for Materials and Processes, Mayfield Road, The King''s Buildings, EH9 3JL Edinburgh, UK;1. Laboratory of Electrochemical Devices Based on Solid State Proton Electrolytes, Institute of High Temperature Electrochemistry, 22 S. Kovalevskoy, 620990 Yekaterinburg, Russia;2. Department of Mechanical Engineering, School of Engineering, University of Thessaly, Pedion Areos, 383 34 Volos, Greece;1. Duzce University, Gumusova Vocational School Department of Metallurgy, 81850, Duzce, Turkey;2. Sakarya University, Department of Metallurgical & Materials Engineering, 54187, Sakarya, Turkey
Abstract:K41X (AISI 441) stainless steel evidenced a high electrical conductivity after 3000 h ageing in H2/H2O side when used as interconnect for solid oxide electrolyser cells (SOEC) working at 800 °C. Perovskite (La1 ? xSrxMnO3 ? δ) and spinel (Co3O4) oxides coatings were applied on the surface of the ferritic steel for ageing at 800 °C for 3000 h. Both coatings improved the behaviour of the steel and give interesting opportunities to use the K41X steel as interconnect for hydrogen production via high temperature steam electrolysis. Co3O4 reduced into Co leading to a very good Area Specific Resistance (ASR) parameter, 0.038 Ω cm2. Despite a good ASR (0.06 Ω cm2), La1 ? xSrxMnO3 ? δ was less promising because it partially decomposed into MnO and La2O3 during ageing in H2/H2O atmosphere.
Keywords:High temperature electrolysis  Hydrogen  Interconnects  Ferritic steels  Perovskite and spinel coatings
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