title: Co3O4/Sm-Doped CeO2/Co3O4Trilayer Coating on AISI 441 Interconnect for Solid Oxide Fuel Cells.
abstract: In this work, a novel Co/Sm-doped CeO2(SDC)/Co trilayer of ∼6 μm is deposited by alternating electrodeposition and electrophoresis and oxidized to a Co3O4/SDC/Co3O4trilayer structure. This coating is unique and effective in the following aspects: (1) The area specific resistance of the coated interconnect is more stable and lower than that of the uncoated interconnect after thermal treatment at 800 °C for 400 h. (2) The Co3O4/SDC/Co3O4coating layer can effectively inhibit Cr diffusion and evaporation and significantly slow the oxidation rate of the interconnect. (3) The Sm0.5Sr0.5Co0.2Fe0.8O3cathode in the electrolyte/cathode/interconnect half-cell retains its initial stoichiometry after 100 h of the thermal treatment. Subsequently, the ohmic resistance RΩ, high frequency polarization resistance RH, and low frequency polarization resistance RLof the half-cell with the Co3O4/SDC/Co3O4coated interconnect are all smaller than those of the half-cell with the bare interconnect. The Co3O4/SDC/Co3O4coating layer has great advantages to be used as a protective layer for the metallic interconnect in solid oxide fuel cells to improve cell performance, stability, and durability.
authors.affiliation: Department of Materials Science and Engineering, Virginia Tech , Blacksburg, Virginia 24061, United States.
authors.forename: Fengyu
authors.identifier: http://orcid.org/0000-0003-3818-176X
authors.initials: F
authors.lastname: Shen
authors.affiliation: Department of Materials Science and Engineering, Virginia Tech , Blacksburg, Virginia 24061, United States.
authors.forename: Kathy
authors.initials: K
authors.lastname: Lu
keywords: Co3O4; Sm-doped CeO2; coating layer; interconnect; solid oxide fuel cell