Electrothermally balanced operation of solid oxide electrolysis cells

Theis Løye Skafte*, Omid Babaie Rizvandi, Anne Lyck Smitshuysen, Henrik Lund Frandsen, Jens Valdemar Thorvald Høgh, Anne Hauch, Søren Knudsen Kær, Samuel Simon Araya, Christopher Graves, Mogens Bjerg Mogensen, Søren Højgaard Jensen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The ongoing green energy transition is increasing the need for dynamic and efficient Power-to-X (PtX) systems to convert surplus wind and solar power to high-value products. The solid oxide electrolysis cell (SOEC) technology offers the highest energy conversion efficiency. However, high degradation and thermal variations that cause thermomechanical stress hinders up-scaling of the SOEC technology. Here we present a novel operation method that alleviates temperature variations and minimize degradation caused by impurities and nickel migration. By rapidly switching between electrolysis mode and brief periods in fuel cell mode, a flat thermal profile is obtained. Our results thus establish a new, simple way to achieve increased SOEC stack and module size and extended lifetime. The new operation method enables dynamic operation of large SOEC modules for renewable energy powered PtX systems which could drastically decrease costs associated with production of high-value green fuels and chemicals from wind and solar power.
Original languageEnglish
Article number231040
JournalJournal of Power Sources
Volume523
Number of pages8
ISSN0378-7753
DOIs
Publication statusPublished - 2022

Keywords

  • Electrolysis
  • Reversible
  • Thermoneutral
  • Power-to-X
  • Solid oxide cells
  • Dynamic operation

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