Hysteresis in the solid oxide fuel cell cathode reaction

Torben Jacobsen, Birgit Zachau-Christiansen, Lasse Bay, M. Juhl Jørgensen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The oxygen electrode reaction at the Pt/yttria-stabilised zirconia (YSZ) interface is investigated at 1000degreesC on Pt point electrodes on YSZ and YSZ point contacts on Pt. Linear potential sweeps show a pronounced non-linear current-voltage relation and inductive hysteresis, in particular at low sweep rates (similar1muVs/sup -1/). Correspondingly, an inductive behaviour is observed at low frequency by impedance measurements on polarised electrodes. The behaviour is attributed to a current-induced activation mechanism and subsequent deactivation at equilibrium conditions. Several mechanisms are discussed and rejected as responsible for the phenomena. Finally, the stability of the triple phase boundary is questioned and a current-sensitive reaction zone geometry is suggested as an explanation for the behaviour.
Original languageEnglish
JournalElectrochimica Acta
Volume46
Issue number7
Pages (from-to)1019-1024
ISSN0013-4686
DOIs
Publication statusPublished - 2001

Keywords

  • autocatalysis
  • inductive effect
  • non-linearity
  • oxygen electrode
  • SOFC

Cite this

Jacobsen, T., Zachau-Christiansen, B., Bay, L., & Juhl Jørgensen, M. (2001). Hysteresis in the solid oxide fuel cell cathode reaction. Electrochimica Acta, 46(7), 1019-1024. https://doi.org/10.1016/S0013-4686(00)00689-7