Effect of {PTFE} nanoparticles in catalyst layer with high Pt loading on {PEM} fuel cell performance
By Avcioglu, Gokce S.; Ficicilar, Berker; Eroglu, Inci
Published in International Journal of Hydrogen Energy
NULL
2016
Abstract
Abstract In this study, Polytetrafluoroethylene (PTFE) was added to catalyst layer structure. This modification was aimed at facilitating excess water removal from the cathode catalyst layer with high Pt loading (1.2 mg/cm2). The weight percentage of {PTFE} in the catalyst inks varied from zero to 30. Membrane electrode assemblies were prepared with a commercial catalyst containing 70 wt % Pt on carbon, by ultrasonic spray coating technique. {PEM} fuel cell performance testing was carried out with two different membrane electrode assembly configuration in order to identify the effect of {PTFE} in anode and cathode catalyst layer structures on water transport mechanism and cell performance. In the first configuration (MEA1), {PTFE} nanoparticles were added to anode and cathode catalyst layers. In the second configuration (MEA2), {PTFE} nanoparticles were added only on cathode catalyst layer. {PEM} fuel cell tests were carried out at both H2/O2 and H2/Air gas-feeding modes. Electrochemical characterization with impedance spectroscopy was carried out to investigate the influence of {PTFE} nanoparticles on reaction kinetics and mass transport. {PTFE} nanoparticles in catalyst layers of 5PTFE_AC provided meso-macro hydrophobic channeling, providing enhanced water management compared to conventional catalyst layers. Higher hydrophobicity in cathode catalyst layer coupled with high airflow rate promotes increased back diffusion rate of water, diminishing flooding at cathode GDL.
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