Ex-situ experimental benchmarking of solid oxide fuel cell metal interconnects

JOURNAL OF POWER SOURCES

卷:437

Article

Bianco, Manuel¹  Tallgren, Johan²  Hong, Jong-Eun³  Yang, Shicai⁴  Himanen, Olli²  Mikkola, Jyrki²  Van herle, Jan¹  Steinberger-Wilckens, Robert⁵ 

[1] EPFL Valais, Inst Mech Engn, Grp Energy Mat, CH-1951 Sion, Switzerland

[2] VTT Tech Res Ctr Finland Ltd, Fuel Cell Solut, POB 1000, FI-02044 Espoo, Finland

[3] Korea Inst Energy Res, Fuel Cell Lab, 152 Gajeong Ro, Daejeon 34129, South Korea

[4] Teer Coatings Ltd, West Stone House,Berry Hill Ind Estate, Droitwich WR9 9AS, England

[5] Univ Birmingham, Sch Chem Engn, Ctr Fuel Cell & Hydrogen Res, Birmingham B15 2TT, W Midlands, England

关键词: Chromium poisoning;    Corrosion evolution;    Ferritic stainless;    Steels;    Interconnects;    Protective coatings;    Solid oxide fuel cell;   

DOI  :  10.1016/j.jpowsour.2019.226900

来源: Elsevier

【 摘 要 】

Solid oxide fuel cells (SOFCs) can convert hydrocarbon fuels, such as methane, into heat and electricity with a high conversion efficiency. The fuel flexibility of the SOFC derives from the high operating temperature (600-900 degrees C). Such a high temperature stresses the materials used in the SOFC stacks, notably the metals constituting the interconnect (IC). Research centres developed in last twenty years specific alloys and coatings compositions. This led to a vast literature production of solutions to mitigate the degradation of the metals used in SOFC stacks. Unfortunately, the testing method and conditions change from one laboratory to another making the comparison of the results often impossible. This article compares systematically more than sixty different solutions to limit the degradation in the IC. The samples differed for the steel composition, the coating deposition technique, and the coating composition. A modified 4-probe technique and SEM/EDS post-test characterization measure the area specific resistance and chromium retention of the samples. Testing results indicate that i) deposition technique is the most relevant parameter, ii) in presence of coatings, the performances are independent of the type of ferritic stainless steel substrate iii) nitriding helps to limit the outward chromium diffusion in case of porous coatings.

【 授权许可】

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