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Diffusion Coatings Nickel–Cobalt for Protecting the Current Collectors of Crofer 22 APU Steel Used in Solid Oxide Electrolyzer Cells

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Abstract

The evolution of the microstructure and the composition of Ni–Co coatings used for protecting the current collectors of stainless steel Crofer 22 APU from oxidation is studied in the operation mode of the anode chamber of a solid-oxide electrolyzer cell (SOEC). It is shown that the interdiffusion of steel and coating components and the redox reactions that proceed under the coating in the SOEC operation mode block the chromium diffusion to the current collector surface. The exploitation of the anodic chamber in the air atmosphere changes the Ni–Cr metal composition of the protective coating to a mixture of highly conductive oxides (Fe,Ni,Co)3O4 and (Ni,Co)O, thus changing the form of the time dependence of the surface resistivity of the junction current collector/anode. At the same time, the 7000 h tests revealed sufficiently low values, viz., ~17 mΩ cm2, which means that these coatings can be used for the anti-oxidation protection of the stainless-steel current collectors in SOECs.

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This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.

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Authors and Affiliations

  1. Osipyan Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, Russia

    O. V. Pikalov, N. V. Demeneva, I. I. Zverkova & S. I. Bredikhin

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  1. O. V. Pikalov
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  2. N. V. Demeneva
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  3. I. I. Zverkova
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  4. S. I. Bredikhin
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Correspondence to N. V. Demeneva.

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Translated by T. Safonova

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Based on the paper presented at the IX All-Russia Conference with international participation “Fuel Cells and Power Plants Based on Them,” Chernogolovka, Moscow region, Russia, 2022.

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Pikalov, O.V., Demeneva, N.V., Zverkova, I.I. et al. Diffusion Coatings Nickel–Cobalt for Protecting the Current Collectors of Crofer 22 APU Steel Used in Solid Oxide Electrolyzer Cells. Russ J Electrochem 60, 169–175 (2024). https://doi.org/10.1134/S1023193524030108

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