Measurement of electrode overpotentials for direct hydrocarbon conversion fuel cells

Venkatesan Venkata Krishnan, Steven McIntosh, Raymond J. Gorte, John M. Vohs

Research output: Contribution to journalArticlepeer-review

Abstract

Cathodic and anodic overpotentials were measured using current interruption and AC impedance spectroscopy for two separate solid oxide fuel cells (SOFCs). The fuel cells used yttria-stabilized zirconia (YSZ) as the electrolyte, strontium-doped lanthanum manganite (LSM) as the cathode, and a porous YSZ layer impregnated with copper and ceria as the anode. The Cu/CeO2/YSZ anode is active for the direct conversion of hydrocarbon fuels. Overpotentials measured using both current interruption and impedance spectroscopy for the fuel cell operating at 700 deg. C on both hydrogen and n-butane fuels are reported. In addition to providing the first electrode overpotential measurements for direct conversion fuel cells with Cu-based anodes, the results demonstrate that there may be significant uncertainties in measurements of electrode overpotentials for systems where there is a large difference between the characteristic frequencies of the anode and cathode processes and/or complex electrode kinetics.
Original languageEnglish
Pages (from-to)191-197
Number of pages7
JournalSolid State Ionics
Volume166
Issue number1-2
Early online date5 Dec 2003
DOIs
Publication statusPublished - 15 Jan 2004
Externally publishedYes

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