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Progress in technologies of metal-supported solid oxide fuel cells

GAO Yuan;LI Zhi;LI Jiahong;GAO Jiutao;LI Chengxin;LI Changjiu;State Key Laboratory of Metal Material Strength,Xi′an Jiaotong University;Shandong Energy Group Company Limited;  
Metal-supported solid oxide fuel cell(MS-SOFC),being able to start-up rapidly,are transformative technology to facilitate the realization of dual carbon target. With low-cost ferritic stainless steel as support whose thermal expansion coefficient(CTE) is similar to that of ceramic electrolyte,MS-SOFC is expected to be of a significantly lower manufacturing cost,good mechanical performance and sealing performance. Metal interconnect and metal support are two core components for a MS-SOFC,and their common materials are ferritic stainless steel,Cr-based alloy and Ni-based alloy. Japan,Germany,the United States and China have developed various stainless steels for SOFCs. And stainless-steel coating technologies have made significant progress which can improve the high temperature oxidation resistance of the materials. In view of the problem in the MS-SOFC prepared by high-temperature sintering method,thermal spraying method and low-temperature sintering method have taken its place. The metal support and interconnect of a MS-SOFC can be effectively connected by traditional welding method,and the fuel gas can be effectively sealed by taking porous metal support-connector structure which is formed in powder pressing and sintering processes. The reasons for the degradation of MS-SOFCs include oxidation of metal materials,cathodic toxicity caused by Cr volatilization,coarsening of catalyst particles,etc. Many companies,such as Ceres Power of the UK,General Electric(GE)of the US,German Aerospace Center(DLR),German Forschungszentrum Jülich(FZJ)and Plansee of Austria,have made remarkable achievements in preliminary commercialization of MS-SOFC.
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