Effect of PTFE nanoparticles in catalyst layer with high Pt loading on PEM fuel cell performance

Avcioglu, Gokce S.
Eroğlu, İnci
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/cm(2)). 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 H-2/O-2 and H-2/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 hydro-phobicity in cathode catalyst layer coupled with high airflow rate promotes increased back diffusion rate of water, diminishing flooding at cathode GDL. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.


Effect of Carboxy Methyl Cellulose and Determination of Pore Throat Criteria for Water-based Drilling Fluids
Kök, Mustafa Verşan (Informa UK Limited, 2009-01-01)
In this research, the effect of carboxy methyl cellulose (CMC) on the rheological properties of two different water-based drilling fluids was studied. It was observed that the fluid loss decreased as CMC concentration increased, but the rate of decrease was too low to notice after 1 gr. CMC. It was also observed that shear stress increased as the CMC concentration increased. Experimentally, it was observed that 1 gr. CMC/350 ml of drilling fluid slurry is sufficiently appropriate for optimum rheological eff...
Effects of membrane electrode assembly components on proton exchange membrane fuel cell performance
Bayrakceken, Ayse; Erkan, Serdar; Turker, Lemi; Eroğlu, İnci (Elsevier BV, 2008-01-01)
The objective of this study is to determine the effects of various factors on the performance of proton exchange membrane (PEM) fuel cell. These factors are membrane thickness, hot-pressing conditions of the gas diffusion layer (GDL) either onto the membrane or membrane electrode assembly (MEA) and Teflon:carbon ratio in the GDL on PEM fuel cell performance. Homemade five-layer and commercial three-layer MEAs were used in the experiments. Nafion (R) 112 and 115 which have nominal thicknesses of 50 and 125 m...
Effect of pressure on combustion kinetics of heavy oils
Bağcı, Ali Suat (Informa UK Limited, 2005-07-01)
In this study, 16 experiments were conducted to study the effects of pressure on crude oil oxidation in limestone medium. Karakus (29 degrees API), Beykan (32 degrees API), Bati Raman (12 degrees API), Camurlu ( 12 degrees API), Adiyaman (26 degrees API), Garzan (28 degrees API) and Raman (18 degrees API) crude oil from Turkish oil fields were used. The mixture of limestone and the crude oil was subjected to a controlled heating schedule under a constant flow rate of air. The produced gas was analyzed for i...
Effect of heating rate on thermal properties and kinetics of raw and cleaned coal samples
Özbas, Kazim Esber; Hicyilmaz, Cahit; Kök, Mustafa Verşan (Informa UK Limited, 2003-01-01)
In this article, thermogravimetry (TG/DTG) was used to determine the effect of heating rate on the thermal properties and kinetics of raw and cleaned coal samples from Soma, Tuncbilek, and Afsin Elbistan regions. TG/DTG experiments were carried out at 4 different heating rates (5, 10, 15, and 20degreesC/min). Generally, for all of the samples higher peak and burnout temperatures were measured with an increasing heating rate. Kinetic parameters of the samples were determined using an Arrhenius-type kinetic m...
Analytical and Numerical Modeling of CO2 Sequestration in Deep Saline Aquifers
Ozgur, E.; Gumrah, F. (Informa UK Limited, 2010-01-01)
The analytical and numerical modeling of CO2 sequestration in deep saline aquifers having different rock and fluid properties was studied under diffusion and convection mechanisms. In a diffusion dominated system, an aquifer with 100 m thickness was saturated with CO2 after 10,000,000 years. It was much earlier in a convective dominant system. In the diffusion process, the dissolution of CO2 in aquifer increased with porosity increase; however, in a convection dominant process dissolution of CO2 in aquifer ...
Citation Formats
G. S. Avcioglu, B. FIÇICILAR, and İ. Eroğlu, “Effect of PTFE nanoparticles in catalyst layer with high Pt loading on PEM fuel cell performance,” INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, pp. 10010–10020, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/52290.