Porosity and Pt content in the catalyst layer of PEMFC: Effects on diffusion and polarization characteristics

Ai Suzuki, Tatsuya Hattori, Ryuji Miura, Hideyuki Tsuboi, Nozomu Hatakeyama, Hiromitsu Takaba, Mark C. Williams, Akira Miyamoto

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

A three-dimensional (3-D) pore network model of polymer electrolyte membrane fuel cell (PEMFC) is presented in order to evaluate the effect of pore size and the effective diffusion coefficient in random porous media. The model of pseudo cathode catalyst layer (CCL) consists of pores and a random distribution of carbon supported platinum (Pt/C) and electrolytes, which were generated on a computer by means of Monte Carlo method. In this study, we utilized this 3-D meso-scale porous model of the CCL, and investigated tortuosity of pores, electrolyte connectivity. The effective Knudsen diffusion coefficient can be successfully obtained. This meso-scale model is applied to study the effects of porosity, pore size and Pt content on the polarization characteristics of the PEMFC. The relation between the composition of the CCL and the characteristics of polarization curve has been clarified.

Original languageEnglish
Pages (from-to)1948-1961
Number of pages14
JournalInternational Journal of Electrochemical Science
Volume5
Issue number12
Publication statusPublished - 2010 Dec 1

Keywords

  • 3-D
  • Catalyst layer
  • Effective diffusion coefficient
  • Electrolytes
  • Knudsen diffusion
  • Pore network
  • Pt/C
  • Tortuosity

ASJC Scopus subject areas

  • Electrochemistry

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