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Experimental review of the performances of protective coatings for interconnects in solid oxide fuel cells

Abstract

Ferritic stainless steel interconnects are used in solid oxide fuel cells; however, coatings are required to improve their performance. Although several types of coatings have been proposed, they have been scarcely investigated under similar conditions. This study compares the characteristics of uncoated Crofer 22 APU and eight different coatings on Crofer 22 APU for up to 3000 h at 800 °C. The coatings were deposited at various research laboratories around the world, and the experiments were performed at Chalmers University of Technology, Sweden. Cross-sections of the samples were analysed using scanning electron microscopy and energy-dispersive x-ray spectroscopy. The (Co,Mn)-based coated steels showed more than 50-fold lower chromium evaporation and at least 3 times thinner Cr2O3 scale thickness compared to uncoated steel. The coated steel samples showed lower area-specific resistance (ASR) values than the uncoated steel after 3000 h of exposure, irrespective of the coating thickness, composition and deposition method.
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Category

Academic article

Language

English

Author(s)

  • Mareddy Jayanth Reddy
  • Bartosz Kamecki
  • Belma Talic
  • Elisa Zanchi
  • Federico Smeacetto
  • John S. Hardy
  • Jung Pyung Choi
  • Lukasz Mazur
  • Robert Vasßen
  • Soumendra N. Basu
  • Tomasz Brylewski
  • Jan-Erik Svensson
  • Jan Froitzheim

Affiliation

  • SINTEF Industry / Sustainable Energy Technology
  • Chalmers University of Technology
  • Politecnico di Torino
  • AGH University of Science and Technology
  • Gdansk University of Technology
  • Research Centre Jülich
  • USA
  • Boston University

Year

2023

Published in

Journal of Power Sources

ISSN

0378-7753

Volume

568

View this publication at Norwegian Research Information Repository