Enhanced catalyst utilization in PEM fuel cells via ultrafast laser modification of the polymer exchange membrane surface

Whitacre, Jay; Murphy, Ryan D.; Marrie, Ayah; Yalisove, S. M.

doi:10.1016/j.elecom.2009.01.005

Cited by 11 publications

(13 citation statements)

References 17 publications

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“…The performance of the pre‐sputtered template electrode is similar to prior work on electrodes fabricated by sputtering Pt on a membrane . The CVDNE performed higher than in prior reported work on an electrode with Pt sputtered on a membrane with a roughness factor >1 . It suggests that the effect of the surface roughness on the performance is one of the considerable differences between the nanofiber electrode and the prior work.…”

Section: Resultssupporting

confidence: 64%

“…[7] The CVDNE performed higher than in prior reported work on an electrode with Pt sputtered on am embrane with ar oughness factor > 1. [9,12] It suggests that the effect of the surface roughness on the performance is one of the considerable differences between the nanofiber electrode and the prior work. However,t he performance of the nanofiber electrode is lower than that reported for NSTF electrodes.…”

Section: Resultsmentioning

confidence: 99%

“…[10] Ap rior study has shown that an electrode thickness of at least af ew micrometers is necessary for liquid water uptake during rapid increases in currentd ensity. [11] Other methods to increase the roughnessf actor of the membrane include laser bombardment [12] and pattern molding. [13] Polymer electrolyte fuel cells are highly efficient and offer high power density,b ut high precious-metal loading and degradation of carbon-supported platinum (Pt) catalysts still hinder commercialization.…”

Section: Introductionmentioning

confidence: 99%

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Vertically Oriented Polymer Electrolyte Nanofiber Catalyst Support for Thin Film Proton‐Exchange Membrane Fuel Cell Electrodes

et al. 2015

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Polymer electrolyte fuel cells are highly efficient and offer high power density, but high precious‐metal loading and degradation of carbon‐supported platinum (Pt) catalysts still hinder commercialization. Ionomer binders in conventional electrodes also introduce undesirable, high oxygen‐transport resistance. This paper presents an alternative composite Nafion nanofiber catalyst support electrode, in which the nanofibers provide robust internal proton transport to a conformal Pt catalyst coating without impeding O2 transport. The high‐surface‐area electrodes are prepared by solution casting ionomer onto a sacrificial template to simultaneously fabricate the nanofibers and the membrane. Thin Pt films are deposited on the nanofibers using either physical vapor deposition or chemical vapor deposition. The electrochemical characterization of the nanofiber electrodes demonstrates the high current density and specific activity of this nanofiber approach relative to prior electrodes fabricated by depositing Pt directly onto other Nafion surfaces.

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Section: Resultssupporting

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Vertically Oriented Polymer Electrolyte Nanofiber Catalyst Support for Thin Film Proton‐Exchange Membrane Fuel Cell Electrodes

et al. 2015

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“…Among different methods for surface modification of polymers, laser assisted treatment offers advantages over chemical and physical methods. It could modify the surface of a polymer precisely and without any contaminants [4,5]. In the last decade this method has rapidly grown and attracted considerable interest among scientists [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Laser induced surface modification of clay-PAN composite nanofibers

et al. 2011

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In this study a newly laser treatment method for surface modification of nanofibers is introduced. The new method is based on different infrared absorption of materials. Surface modification of Clay-PAN composite nanofibers was performed using selective laser etching approach with CO 2 pulsed laser in order to increase surface area of nanofibers. The surface structure of resulted nanofibers is characterized using field emission scanning electron microscope and the results show characteristic modification of the surface topography of laser treated nanofibers. The modified surface structure of nanofibers was studied and analyzed for different laser pulse numbers and laser fluence. The results show that nanofiber surface modification strongly depends on the number of CO 2 laser pulses and frequency of modified sites on the surface of nanofibers increasing with increasing the pulse fluence. This new technique is highly selective and can also compete with conventional techniques for nanofibers surface modification.

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“…Among different methods for surface modification of polymers, laser‐assisted treatment offers advantages over chemical and physical methods 12, 13. In the last decade, this method has rapidly grown and attracted considerable interest among scientists 14, 15.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of silica–PAN composite nanofibers induced by CO₂‐pulsed laser

Esfandarani

Johari

Amrollahi

et al. 2011

J of Applied Polymer Sci

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In this study, the modification induced by CO 2 -pulsed laser on the surface morphology of silicapolyacrylonitrile composite nanofibers has been investigated. Applied surface modification method is based on different infrared adsorption of materials. Two types of composite nanofibers containing silica nanoparticles with various diameters are irradiated with CO 2 -pulsed laser of 1084 wavenumber (cm À1 ). Surface morphology of irradiated composite nanofibers was analyzed using field emission scanning electron microscope (FE-SEM). FE-SEM scans show characteristic modification on the surface of nanofibers with controlled distribution and dimension.

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Enhanced catalyst utilization in PEM fuel cells via ultrafast laser modification of the polymer exchange membrane surface

Cited by 11 publications

References 17 publications

Vertically Oriented Polymer Electrolyte Nanofiber Catalyst Support for Thin Film Proton‐Exchange Membrane Fuel Cell Electrodes

Vertically Oriented Polymer Electrolyte Nanofiber Catalyst Support for Thin Film Proton‐Exchange Membrane Fuel Cell Electrodes

Laser induced surface modification of clay-PAN composite nanofibers

Surface modification of silica–PAN composite nanofibers induced by CO₂‐pulsed laser

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Enhanced catalyst utilization in PEM fuel cells via ultrafast laser modification of the polymer exchange membrane surface

Cited by 11 publications

References 17 publications

Vertically Oriented Polymer Electrolyte Nanofiber Catalyst Support for Thin Film Proton‐Exchange Membrane Fuel Cell Electrodes

Vertically Oriented Polymer Electrolyte Nanofiber Catalyst Support for Thin Film Proton‐Exchange Membrane Fuel Cell Electrodes

Laser induced surface modification of clay-PAN composite nanofibers

Surface modification of silica–PAN composite nanofibers induced by CO2‐pulsed laser

Contact Info

Product

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About

Surface modification of silica–PAN composite nanofibers induced by CO₂‐pulsed laser