A multiscale model for proton exchange membrane fuel cells with order-structured catalyst layers

P. Z. Lin, J. Sun, M. C. Wu, T. S. Zhao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Order-structured catalyst layers offer a promising solution to substantially reducing the Pt loading while maintaining the performance of proton exchange membrane fuel cells (PEMFCs). In this work, we develop a multiscale model to investigate the mass transport characteristics of a PEMFC with ordered catalyst layers. A Langmuir adsorption equation is proposed to describe the ionomer-Pt interfacial transport process in a local oxygen transport sub-model, which is integrated into a two-dimensional, two-phase cell-scale model. Simulations are validated against experimental data in the literature. Results show that the fuel cell with ordered catalyst layers can achieve much higher performance than that with conventional catalyst layers, due to the enhanced bulk and local oxygen transport. Moreover, both local oxygen transport resistances of ordered and conventional catalyst layers show an inverse proportional function of Pt loading, while the ordered catalyst layers exhibit a much smaller local oxygen transport resistance than their conventional counterparts. Under limiting current conditions, oxygen transport across the ionomer-Pt interface dominates the local transport resistance, thus hindering the cell performance. The effects of pore size of the ordered catalyst layers and relative humidity on the oxygen transport characteristics and cell performance are also investigated. This work provides new insights into the mass transport mechanisms in ordered catalyst layers, which will facilitate the development of high-performance PEMFCs with low Pt loading.

Original languageEnglish
Article number123092
JournalInternational Journal of Heat and Mass Transfer
Volume195
DOIs
Publication statusPublished - Oct 2022

Keywords

  • Multiscale modeling
  • Order-structured catalyst layer
  • Oxygen transport resistance
  • Proton exchange membrane fuel cell

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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