Preparation and Performance Evaluation of La Doped Mn-Co Spinel Coating on Connecting Board of Solid Oxide Electrolysis Cell

When metal connecting board of solid oxide electrolysis cell (SOEC) are used for long time in a medium-to-high temperature environment (600～800 ℃), severe surface oxidation increases the internal resistance of the electrolytic cell, and the volatilization of Cr from the metal substrate reduces the electrochemical activity of the electrode. The combined effect of the two leads to severe degradation of the performance of SOEC. In response to the above problems, Mn-Co coating and Mn-Co-La coating were prepared on commercial SUS430 metal substrate by electrophoretic deposition method. Subsequently, with using the process of successively sintering under neutral atmosphere (950 ℃, N2) and oxidizing atmosphere (825 ℃, air) conditions, the strong and dense Mn-Co coatings and Mn-Co-La coatings were obtained. Moreover, the effects of sintering atmosphere and La element doping on coating properties were studied. The morphology, phase composition, element distribution and area specific resistance of the coatings were cha