4.7 Article

Effect of compression on pore size distribution and porosity of PEM fuel cell catalyst layers

Journal

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 44, Issue 41, Pages 23396-23405

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.07.036

Keywords

Catalyst layer; Compression; Porosity; Pore size distribution; Mechanical properties; Modeling

Funding

  1. Natural Sciences and Engineering Research Council of Canada (NSERC) [CRDPJ 452170-13]
  2. Automotive Fuel Cell Corporation (AFCC)

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In this study, effects of compression (up to 5 MPa) on pore size distribution (PSD) and porosity of catalyst layers (CL) are investigated using a developed model for deformation of CL under compression. The model is based on effective medium theory and uses a representative geometry (unit cell) to simplify the complex and random porous structure of CL. In this model, different sizes are found for unit cells which are based on CL PSD measurement; this means that unit cell size has distribution since PSD is used as an input to the model. The model has been validated with experimental data in our previous publications. Effect of compression on four different CL samples is studied using the developed model and change of pore diameter is found as function of compression. The change of pore size is different for each sample and dependents on CL initial porosity, PSD, and ink properties. PSD and porosity, which are the indications of microstructure of CL, are found after compression up to 5 MPa. Larger pores show the most change, which causes the void volume percentage of smaller pores to increase, even though the number of pores remain the same. It is also found that the diameter of secondary pores can be decreased by up to 50% depending on CL microstructure, which is significant. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

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