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Hasani-Sadrabadi M.M.,Amirkabir University of Technology | Hasani-Sadrabadi M.M.,Ecole Polytechnique Federale de Lausanne | Shabani I.,Amirkabir University of Technology | Shabani I.,Stem Cell Technology Research Center | And 2 more authors.
Journal of Power Sources | Year: 2011

New types of triple-layer membranes were fabricated using multi-step impregnation of Nafion in electrospun webs based on bead-free nanofibers of sulfonated poly(ether sulfone) (SPES). The results showed that the fabricated nanofiber-filled membrane owing to its reduced methanol permeability as well as sufficient proton conductivity and membrane selectivity can be used as a promising proton exchange membrane for direct methanol fuel cell (DMFC) applications. The single cell DMFC performance results revealed that the SPES nanofiber-based triple-layer membranes have higher electrochemical performance than commercial Nafion membranes. © 2011 Elsevier B.V. All rights reserved. Source


Hasani-Sadrabadi M.M.,Ecole Polytechnique Federale de Lausanne | Hasani-Sadrabadi M.M.,Amirkabir University of Technology | Dashtimoghadam E.,Amirkabir University of Technology | Majedi F.S.,Ecole Polytechnique Federale de Lausanne | And 4 more authors.
RSC Advances | Year: 2013

Here we show that the transport properties and electrochemical performance of polyelectrolyte membranes are improved through the dispersion of chitosan-wrapped carbon nanotubes, for direct methanol fuel cell applications. Methanol permeability is reduced via improving the interfacial interactions and the solubilization of CNTs in the Nafion matrix, as well as inducing the formation of long-range oriented conduction pathways in the vicinity of the decorated one-dimensional nanostructure. The improved membrane selectivity results in a considerably enhanced fuel cell efficiency (16% vs. 11%) and a power generation capacity more than two times higher (110 mW cm-2vs. 47 mW cm-2) in a concentrated methanol solution (5 M), in comparison with the commercial Nafion®117 membrane. © The Royal Society of Chemistry 2013. Source


Hasani-Sadrabadi M.M.,Amirkabir University of Technology | Hasani-Sadrabadi M.M.,Ecole Polytechnique Federale de Lausanne | Dashtimoghadam E.,Amirkabir University of Technology | Majedi F.S.,Amirkabir University of Technology | And 3 more authors.
International Journal of Hydrogen Energy | Year: 2011

A novel double layer proton exchange membrane (PEM) comprising a layer of structurally modified chitosan, as a methanol barrier layer, coated on Nafion®112 was prepared and assessed for direct methanol fuel cell (DMFC) applications. Scanning electron microscope (SEM) micrographs of the designed membrane revealed a tight adherence between layers, which indicate the high affinity of opposite charged polyelectrolyte layers. Proton conductivity and methanol permeability measurements showed improved transport properties of the designed membrane compared to Nafion®117. Moreover, DMFC performance tests revealed a higher open circuit voltage and power density, as well as overall fuel cell efficiency for the double layer membrane in comparison with Nafion®117, especially at elevated methanol solution feed. The obtained results indicate the designed double layer membrane as a promising PEM for high-performance DMFC applications. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights. Source


Hasani-Sadrabadi M.M.,Ecole Polytechnique Federale de Lausanne | Hasani-Sadrabadi M.M.,Amirkabir University of Technology | Majedi F.S.,Ecole Polytechnique Federale de Lausanne | Vandersarl J.J.,Ecole Polytechnique Federale de Lausanne | And 5 more authors.
Journal of the American Chemical Society | Year: 2012

At nanoscale length scales, the properties of particles change rapidly with the slightest change in dimension. The use of a microfluidic platform enables precise control of sub-100 nm organic nanoparticles (NPs) based on polybenzimidazole. Using hydrodynamic flow focusing, we can control the size and shape of the NPs, which in turn controls a number of particle material properties. The anhydrous proton-conducting nature of the prepared NPs allowed us to make a high-performance ion exchange membrane for fuel cell applications, and microfluidic tuning of the NPs allowed us subsequently to tune the fuel cell performance. © 2012 American Chemical Society. Source


Hasani-Sadrabadi M.M.,Ecole Polytechnique Federale de Lausanne | Hasani-Sadrabadi M.M.,Amirkabir University of Technology | Dashtimoghadam E.,Amirkabir University of Technology | Majedi F.S.,Amirkabir University of Technology | And 3 more authors.
Nanoscale | Year: 2013

Here we demonstrate design and electrochemical characterization of novel proton exchange membranes based on Nafion and superacid-doped polymer coated carbon nanotubes (CNTs). Polybenzimidazole-decorated CNT (PBI-CNT), a high-performance proton exchange nanostructure, was doped using phosphotungstic acid (PWA) as a super proton conductor. The engineered nanohybrid structure was shown to retain water molecules and provide high proton conduction at low humidity and elevated temperatures. The developed complex nanomaterial was then incorporated into the Nafion matrix to fabricate nanocomposite membranes. The acid-base interactions between imidazole groups of PBI and sulfonate groups of Nafion facilitate proton conductivity, especially at elevated temperatures. The improved characteristics of the membranes at the nanoscale result in enhanced fuel cell power generation capacity (386 mW cm-2) at elevated temperatures and low humidity (40% R.H.), which was found to be considerably higher than the commercial Nafion®117 membrane (73 mW cm-2). © 2013 The Royal Society of Chemistry. Source

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