Micro-Tubular Solid Oxide Fuel Cell Polarization and Impedance Variation With Thin Porous Samarium-Doped Ceria and Gadolinium-Doped Ceria Buffer Layer Thickness

Ryan J. Milcarek, Jeongmin Ahn

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Porous buffer layers for anode-supported solid oxide fuel cells (SOFCs) have been investigated for many years with different thicknesses of the buffer layer in each study. In this work, micro-tubular SOFCs having samarium-doped ceria (SDC) and gadolinium-doped ceria (GDC) buffer layers are compared using the current-voltage technique, electrochemical impedance spectroscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The thickness of the porous SDC and GDC buffer layer is investigated systematically with the thickness varying between 0.3 and 2.0 μm. The power density varies between 212 and 1004 mW/cm2 for samples having different SDC buffer layer thickness. Comparable changes occur for the SOFCs with a GDC buffer layer, but less variation in polarization losses resulted. Variation in electrochemical performance varies due to changes in ohmic resistance, cathode activation polarization, and interfacial reactions between the cathode and electrolyte materials.

Original languageEnglish (US)
Article number21004
JournalJournal of Electrochemical Energy Conversion and Storage
Volume18
Issue number2
DOIs
StatePublished - May 2021

Keywords

  • anode-supported solid oxide fuel cell (AS-SOFC)
  • buffer layer
  • fuel cells
  • interlayer
  • intermediate temperature solid oxide fuel cell
  • micro-tubular solid oxide fuel cell (mT-SOFC)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Mechanics of Materials
  • Mechanical Engineering

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