Determination of electrode oxygen transport kinetics using electrochemical impedance spectroscopy combined with three-dimensional microstructure measurement: Application to Nd2NiO4+d

Kyle Yakal-Kremski*, Liliana V. Mogni, Alejandra Montenegro-Hernández, Alberto Caneiro, Scott A. Barnett

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Oxygen reduction kinetic parameters - oxygen ion diffusion Dδ, molar surface exchange rate RO and surface exchange coefficient k - were determined for porous Nd2NiO4+d solid oxide fuel cell cathodes as a function of temperature and oxygen partial pressure by analyzing electrochemical impedance spectroscopy data using the Adler-Lane-Steele model. Electrode microstructural data used in the model calculations were obtained by three-dimensional focused ion beam-scanning electron microscope tomography. Cathodes were fabricated using Nd2NiO4+d powder derived from a sol-gel method and were tested as symmetrical cells with LSGM electrolytes. The oxygen surface exchange rate exhibited a power-law dependency with oxygen partial pressure, whereas the oxygen diffusivity values obtained varied only slightly. The present analysis suggests that the O-interstitial diffusion has a bulk transport path, whereas the surface exchange process involves dissociative adsorption on surface sites followed by O-incorporation. For Nd2NiO4+d at 700°C and 0.2 atm oxygen pressure, Dδ = 5.6 . 10-8 cm2s-1, RO = 2.5 . 10-8 mol . cm-2 s-1. The present Dd and RO values and their activation energies are slightly different to those previously reported for Nd2NiO4+d using other measurement methodologies, and lower than typical state-of-the-art Co-rich perovskites. However, the average kd = 1.0 10-5 cm . s-1 at 700°C is comparable to those of fast oxygen exchange rate perovskites.

Original languageEnglish (US)
Pages (from-to)F1366-F1374
JournalJournal of the Electrochemical Society
Volume161
Issue number14
DOIs
StatePublished - 2014

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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