Designing Tailored Gas Diffusion Layers with Pore Size Gradients via Electrospinning for Polymer Electrolyte Membrane Fuel Cells

Balakrishnan M, Shrestha P, Ge N, Lee C, Fahy KF, Zeis R, Schulz VP, Hatton BD, Bazylak A (2020)

Publication Type: Journal article

Publication year: 2020

Journal

ACS Applied Energy Materials American Chemical Society

Book Volume: 3

Pages Range: 2695-2707

Journal Issue: 3

DOI: 10.1021/acsaem.9b02371

Abstract

We present electrospinning as a versatile technique to design and fabricate tailored polymer electrolyte membrane (PEM) fuel cell gas diffusion layers (GDLs) with a pore-size gradient (increasing from catalyst layer to flow field) to enhance the high current density performance and water management behavior of a PEM fuel cell. The novel graded electrospun GDL exhibits highly robust performance over a range of inlet gas relative humidities (RH). At relatively dry (50% RH) inlet conditions that exacerbate ohmic losses, the graded GDL lowers ohmic resistance and improves high current density performance compared to a uniform GDL with larger pores and fiber diameters. Specifically, the graded GDL facilitates a beneficial degree of liquid water retention at the catalyst layer/GDL interface due to the high capillary pressure inherent in its microstructure, thereby improving membrane hydration. Additionally, enhanced graphitization and connectivity of the graded electrospun fibers improves heat dissipation from the catalyst layer interface compared to the GDL with larger fiber diameters, thereby reducing membrane dehydration. When the inlet RH is raised to fully humid (100% RH) conditions, the graded GDL mitigates liquid water accumulation and lowers mass transport resistance. Specifically, the pore size gradient directs the removal of liquid water from the GDL, resulting in superior performance at high current densities.

Authors with CRIS profile

Roswitha Zeis

Involved external institutions

University of Toronto CA Canada (CA) Helmholtz Institut Ulm DE Germany (DE) Universität Mannheim DE Germany (DE)

How to cite

APA:

Balakrishnan, M., Shrestha, P., Ge, N., Lee, C., Fahy, K.F., Zeis, R.,... Bazylak, A. (2020). Designing Tailored Gas Diffusion Layers with Pore Size Gradients via Electrospinning for Polymer Electrolyte Membrane Fuel Cells. ACS Applied Energy Materials, 3(3), 2695-2707. https://doi.org/10.1021/acsaem.9b02371

MLA:

Balakrishnan, Manojkumar, et al. "Designing Tailored Gas Diffusion Layers with Pore Size Gradients via Electrospinning for Polymer Electrolyte Membrane Fuel Cells." ACS Applied Energy Materials 3.3 (2020): 2695-2707.

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