Combining structural and electrochemical analysis of electrodes using micro-computed tomography and a microfluidic fuel cell

Huei Ru Jhong, Fikile R. Brushett, Leilei Yin, Darren M. Stevenson, Paul J.A. Kenis

Research output: Contribution to journalArticlepeer-review

Abstract

Detailed investigation of the relationship between the physical structure and electrochemical activity of state-of-the-art fuel cell electrodes is a critical, yet often poorly reported or proprietary, step in the manufacturing of cheaper and more durable configurations. Here we demonstrate the utility of X-ray micro-computed tomography (MicroCT) for detailed characterization of the architecture and buried interfaces of fuel cell electrodes in a non-destructive fashion. We employ a combined thresholding and filament tracing based analytical protocol for image analysis which enables more accurate quantification of GDE structures as compared to previously-used thresholding-only methods. Furthermore, we report on a methodology of combining in-situ electrochemical analysis in a microfluidic fuel cell and ex-situ structural analysis in a MicroCT which enables direct correlation of changes in electrode performance to changes in physical structure, in this case, porosity. As a demonstration, the effects of electrode compression are investigated. We observed that both subtle shifts in structure in the microporous and catalyst layers at low compression pressures (< 1 × 10 3+ lb f) and more drastic structural densification of the macroporous carbon fiber layer at moderate compression pressures (≥1 × 10 3+ lb f) impact electrode performance.

Original languageEnglish (US)
Pages (from-to)B292-B298
JournalJournal of the Electrochemical Society
Volume159
Issue number3
DOIs
StatePublished - Feb 29 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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