Abstract
: Two grades of chromium-free alloys were studied in order to apply them as interconnectors for solid oxide fuel cells. The surface modification methods were proposed for each alloy with the purpose of forming of oxide scales considering the required physicochemical properties. Investigations of the structure and properties of the obtained oxide scales were performed and the efficiency of the chosen surface modification methods was approved. The samples with the surface modification exhibited higher conductivity values in comparison with the nonmodified samples. A compatibility study of samples with surface modification and glass sealant of chosen composition was accomplished. The modified samples demonstrated good adhesion during testing and electrical resistance less than 40 mOhm/cm2 at 850 °C in air, which allowed us to recommend these alloys with respective modified oxide scales as interconnectors for SOFC.
Highlights
Various types of fuel cells that differ in electrode and electrolyte materials and possess different operating temperatures are known
The surface modification has a beneficial effect on the structure of the oxide scale at the macro- and microlevels: The samples with the modified oxide scale do not show delamination, cracks, and other defects, and have an uniform surface
The electrical conductivity of modified samples was less than 40 mOhm/cm2 at 850 ◦ C in air, which is the acceptable value for using these alloys as the interconnectors for solid oxide fuel cells (SOFC)
Summary
Various types of fuel cells that differ in electrode and electrolyte materials and possess different operating temperatures are known. Among them are solid polymer, alkaline, phosphoric acid, molten carbonate, and solid oxide fuel cells (SOFC) [1]. Efforts of current research have proved that one of the main problems encountered during the operation of the SOFC is the poor stability of used interconnectors. Ceramic interconnectors, such as lanthanum and yttrium chromite, as well as their various modifications, have such disadvantages, such as the coefficient of thermal expansion (CTE) not Energies 2019, 12, 4795; doi:10.3390/en12244795 www.mdpi.com/journal/energies.
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