High performance PEM fuel cell catalyst layers with hydrophobic channels

Avcioglu, Gokce S.
Eroğlu, İnci
Polymer electrolyte membrane fuel cell performance has been enhanced with efficient water management by modification of the structure of the catalyst layer. Polytetrafluoroethylene (PTFE) was added to the catalyst layer structure by using two-step catalyst ink preparation method. Physical and electrochemical characterization of catalyst layers with hydrophobic nanoparticles were investigated via TGA-DTA, XRD, nitrogen physisorption, SEM, TEM, EDX analysis, and cyclic voltammetry technique. In addition, performance tests of MEAs were carried out. Catalyst layer structure after performance tests was observed by SEM analysis. Tubular open-ended mesopores have been constructed through the catalysts with hydrophobic nanoparticle addition. PTFE addition to the catalyst layer structure decreased both electrochemical surface area and Pt utilization. Mesoporous hydrophobic channels in the catalyst layer provided decreasing mass transport limitations at higher current densities, by this way, power density of Pt/C-Nafion/PTFE catalyst enhanced. It is concluded that mesoporous hydrophobic channels through the catalyst layer facilitate water removal. Copyright (c) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.


Improved PEM fuel cell performance with hydrophobic catalyst layers
Avcioglu, Gokce S.; FIÇICILAR, BERKER; Eroğlu, İnci (2018-10-04)
Flooding of catalyst layers is one of the major issues, which effects performance of low temperature proton exchange membrane fuel cells (PEMFC). Rendering catalyst layers hydrophobic one may improve the performance of PEMFC depending on Pt percentage in the catalyst and Polytetrafluoroethylene (PTFE) loading on the electrode. In this study, effect of hydrophobicity in catalyst layers on performance has been investigated by comparing performances of membrane electrode assemblies prepared with 48% Pt/C. Ultr...
Influence of FEP nanoparticles in catalyst layer on water management and performance of PEM fuel cell with high Pt loading
Avcioglu, Gokce S.; FIÇICILAR, BERKER; Eroğlu, İnci (2017-01-05)
In this study, fluorinated ethylene propylene (FEP) nanoparticles were added to catalyst layer (CL) to facilitate excess water removal from the triple phase boundary in high Pt loading (1.2 mg/cm(2)) proton exchange membrane fuel cell (PEMFC) electrodes. The loading of PEP in the catalyst ink was varied from zero to 30 weight percentage. High-performance electrodes for anode and cathode were prepared by ultrasonic spray coating technique with a commercial catalyst containing 70 wt. % Pt on carbon. Different...
Facilitation of water management in low Pt loaded PEM fuel cell by creating hydrophobic microporous layer with PTFE, FEP and PDMS polymers: Effect of polymer and carbon amounts
ÖZTÜRK, Ayşenur; FIÇICILAR, BERKER; Eroğlu, İnci; BAYRAKÇEKEN YURTCAN, Ayşe (2017-08-17)
Microporous layers (MPLs) were prepared with different hydrophobic polymers to establish water management in polymer electrolyte membrane (PEM) fuel cells. Besides conventionally used polymers polytetrafluoroethylene (PTFE) and fluorinated ethylene propylene (FEP), two different molecular weights (MW) of polydimethylsiloxane (PDMS) polymer were used as hydrophobic materials in MPL. Membrane electrode assemblies (MEAs) having MPLs with low MW PDMS polymer exhibited the best fuel cell performance compared to ...
Development of 500 W PEM fuel cell stack for portable power generators
DEVRİM, YILSER; Devrim, Huseyin; Eroğlu, İnci (2015-06-29)
Polymer Electrolyte Membrane Fuel Cell (PEMFC) portable power generators are gaining importance in emergency applications. In this study, an air-cooled PEMFC stack was designed and fabricated for net 500 W power output. Gas Diffusion Electrodes (GDE's) were manufactured by ultrasonic spray coating technique. Stack design was based on electrochemical data obtained at 0.60 V was 0.5 A/cm(2) from performance tests of a single cell having the same membrane electrode assemblies (MEA) that had an active area of 1...
Enhancement in Oxygen Reduction Reaction Activity of Nitrogen-Doped Carbon Nanostructures in Acidic Media through Chloride-Ion Exposure
Jain, Deeksha; Mamtani, Kuldeep; Gustin, Vance; Gunduz, Seval; Çelik, Gökhan; Waluyo, Iradwikanari; Hunt, Adrian; Co, Anne C.; Ozkan, Umit S. (2018-07-11)
Nitrogen-doped carbon nanostructures (CNx) are promising cathode materials as catalysts for the oxygen reduction reaction (ORR) in polymer electrolyte membrane (PEM) fuel cells. Incorporation of chlorine into CNx catalysts using a facile methodology can lead to a significant improvement in the ORR activity in acidic media, as confirmed by electrochemical half-cell measurements. The chlorine-containing CNx catalyst (CNx-Cl) is synthesized by soaking CNx powder in 0.3 M HCl. The analysis of near-edge X-ray ab...
Citation Formats
G. S. Avcioglu, B. FIÇICILAR, A. BAYRAKÇEKEN YURTCAN, and İ. Eroğlu, “High performance PEM fuel cell catalyst layers with hydrophobic channels,” INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, pp. 7720–7731, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/57939.