RAS Institute of Solid State Physics (Chernogolovka, Russia):

O. V. Pikalov, Post-graduate Student, e-mail: pikalov@issp.ac.ru
D. V. Matveev, Cand. Phys.-Math., Senior Researcher, e-mail: matveev@issp.ac.ru
N. V. Demeneva, Cand. Phys.-Math., Researcher, e-mail: ladyn@issp.ac.ru

Innovation Center “Biryuch”, EFKO Group of Companies (Malobykovo, Russia):

M. N. Levin, Dr. Phys.-Math., General Director, e-mail: levinmn@gmail.com

A study of the oxidation features of ferritic chromium steels of 08Kh18Т1, 12Kh17 and AISI 430 grades, considered as current collectors of solid oxide fuel cells (SOFC), has been carried out. The effect of alloying elements on the composition of the formed oxide films, the kinetics of oxidation, and the specific surface resistance of steel was studied during exposure to 800–850 °C in air and a constant current load of 0.5 A/cm2 in contact with the cathode material La_0.8Sr_0.2MnO₃ for 750–4110 h. It is shown that sufficiently high values of resistance are due to the formation of multiphase oxide films with low conductivity on the surface of steels during oxidation. However, it is possible to use these steels with protective coatings, which will prevent the formation of multiphase scale with low adhesion on the surface and, at the same time, ensure high conductivity in contact with the SOFC cathode.
This work was financially supported by the Ministry of Education and Science (Agreement No. 075-15-2019-1714 on the provision of a grant in the form of a subsidy from the Ministry of Education and Science of Russia dated 02.12.2019 “Development of solid oxide fuel cells batteries of an anode-supporting structure for a highly efficient generator of hydrogen energy”. Unique project identifier RFMEFI60819X0279.

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