Quantitative analysis of single-electrode plots to understand in-situ behavior of individual electrodes

Matt S. Naughton, Akash A. Moradia, Paul J.A. Kenis

Research output: Contribution to journalArticlepeer-review

Abstract

Fuel cells are gaining increasing attention as portable power sources due to their inherent efficiency advantages. Many aspects of electrode and catalyst behavior within an operating fuel cell, however, are still not well-understood. The major divide between catalyst-based rotating disk electrode experiments and full-cell experiments can lead to disappointing results when a promising catalyst is tested in a fuel cell. Here, using a flowing electrolyte-based microfluidic H 2O 2 fuel cell with a reference electrode, we demonstrate the ability to analyze single-electrode performance in-situ using a novel analysis protocol that provides kinetic parameters R ohmic and kinetic to quantify individual electrode data. Using this protocol, we determine the mass transport and ohmic effects on these kinetic parameters and correlate them with actual fuel cell performance. We also compare the performance of identical electrodes in alkaline and acidic media using both our analytical method and electrochemical impedance. The quantitative parameters are show to predict power density within 5 for measured data and were then used to predict performance for a newly assembled fuel cell, which was accurate within 10 of actual power density inside the measured range. In summary, the analytical method reported here can improve the understanding of in-situ electrode behavior.

Original languageEnglish (US)
Pages (from-to)B761-B769
JournalJournal of the Electrochemical Society
Volume159
Issue number6
DOIs
StatePublished - May 28 2012

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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