Parametric study of anodic microstructures to cell performance of planar solid oxide fuel cell using measured porous transport properties

C. M. Huang, S. S. Shy, C. W. Chien, C. H. Lee

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

This study reports effects of porosity (ε), permeability (k) and tortuosity (τ) of anodic microstructures to peak power density (PPD) of a single-unit planar anode-supported SOFC based on 3D electrochemical flow models using measured porous transport properties. Applying particle image velocimetry, a transparent porous rib-channel with different ε is applied to measure an effective viscosity (μe) in the Brinkman equation commonly used to predict flow properties in porous electrodes. It is found that, contrary to the popular scenario, μe is not equal to the fluid viscosity (μf), but it is several orders in magnitude smaller than μf resulting in more than 10% difference on values of PPD. Numerical analyses show: (1) while keeping k and τ fixed with ε varying from 0.2 to 0.6, the highest PPD occurs at ε = 0.3 where the corresponding triple-phase-boundary length is a maximum; (2) PPD increases slightly with k when k ≤ 10-11 m2 due to the diffusion limitation in anode; and (3) PPD decreases with τ when τ > 1.5 due to the accumulation of non-depleted products. Hence, a combination of ε = 0.3, k = 10-11 m2, and τ = 1.5 is suggested for achieving higher cell performance of planar SOFC.

Original languageEnglish
Pages (from-to)2260-2265
Number of pages6
JournalJournal of Power Sources
Volume195
Issue number8
DOIs
StatePublished - 15 Apr 2010

Keywords

  • Anodic microstructures
  • Brinkman equation
  • Peak power density
  • Permeability and tortuosity
  • Porosity
  • Porous slip velocity

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