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Showing 1 to 20 of 62 for “"Proton exchange membrane fuel cells"”.
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Design & development of innovative proton exchange membrane fuel cells
… is concerned with the design and development of Proton Exchange Membrane (PEM) fuel cells and provides a body of information for continued PEM fuel cell development, which will ideally aid in the future commercialisation of these electrochemical devices. Through a combination of numerical …
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High Temperature Polymers for Proton Exchange Membrane Fuel Cells
Novel proton exchange membranes (PEMs) were investigated that show potential for operating at higher temperatures in both direct methanol (DMFC) and H2/air PEM fuel cells. The need for thermally stable polymers immediately suggests the possibility of heterocyclic polymers bearing appropriate ion …
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Low platinum loading electrospun electrodes for proton exchange membrane fuel cells
… supports for sputtered platinum catalyst in proton exchange membrane fuel cells. The performance of the sputtered nanofiber supports was similar to that of sputtered commercial gas diffusion layers in single cell fuel cell tests. However, sputtered platinum electrodes performed significantly …
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Study of catalysts with high stability for proton exchange membrane fuel cells
The innovation and investigation of catalysts in proton exchange membrane fuel cells are included in this thesis. In the first part of this work, stability of the catalyst support of PEMFC catalyst is investigated. Nanoscale platinum particles were loaded on two different kinds of carbon supports, …
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Polymeric and Polymer/Inorganic Composite Membranes for Proton Exchange Membrane Fuel Cells
Several types of novel proton exchange membranes which could be used for both direct methanol fuel cells (DMFCs) and hydrogen/air fuel cells were investigated in this work. One of the main challenges for DMFC membranes is high methanol crossover. Nafion, the current perfluorosulfonic acid copolymer …
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Bio-engineered gas diffusion electrodes (GDEs) for proton exchange membrane fuel cells (PEMFCs)
… a barrier to the successful commercialisation of Proton Exchange Membrane Fuel Cells (PEMFCs). Successful mass production of fuel cell components combined with the recovery of PGMs from waste, more efficient PGM use or the replacement of PGMs catalyst is necessary to reduce costs per unit. Current …
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Synthesis and Characterization of Multiblock Copolymers for Proton Exchange Membrane Fuel Cells (PEMFC)
… multiblock copolymers are promising proton exchange membrane (PEM) materials due to their ability to form various morphological structures which enhance transport. Four arylene chlorides monomers (2,5-Dichlorobenzophenone and its derivatives) were first successfully synthesized from …
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Durability study of proton exchange membrane fuel cells via experimental investigations and mathematical modeling
… ether sulfone) random copolymer (BPSH35) membranes is explored under ambient conditions, with respect to the effects of initial strain rate, counterion type, molecular weight and the presence of inorganic fillers. A three-dimensional "bundle-cluster" model is proposed to interpret the …
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Three dimensional thermal modelling of high temperature proton exchange membrane fuel cells in a serpentine design
… work is to model a segment of a unit cell of a fuel cell stack using numerical methods which is classified as computational fluid dynamics and implementing the work in a commercial computational fluid dynamics package, FLUENT. The focus of my work is to study the thermal distribution within this …
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Characterization of Structure-Property Relationships in Hydrophilic-Hydrophobic Multiblock Copolymers for Use in Proton Exchange Membrane Fuel Cells
Proton exchange membrane fuels cells (PEMFCs) are one of the primary alternatives to internal combustion engines. The key component is the proton exchange membrane, or PEM, which should meet a number of requirements, including good proton conductivity under partially humidified conditions. A number …
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Growth and use of Carbon Nanotube Nanoforests as Gas Diffusion Layers in Industrial-Scale Proton Exchange Membrane Fuel Cells
Proton exchange membrane fuel cells are promising sources of electrical energy for stationary generation, transportation, portable and backup power. The performance is greatly impacted by a variety of factors including cell temperature, gas flow rates, reactant humidification, and water management. …
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Next-generation ionomers for proton exchange membrane fuel cells From catalyst¿ionomer interactions to membrane¿electrode assembly performance and durability
L'abstract è presente nell'allegato / the abstract is in the attachment
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Synthesis and Characterization of Sulfonated Poly (Arylene Ether Sulfone) Copolymers Via Direct Copolymerization: Candidates for Proton Exchange Membrane Fuel Cells
… copolymers, which had properties desirable for proton exchange membranes (PEM) in fuel cells. Commercially available bisphenols were selected to produce cost effective alternative PEMs. Partially aliphatic bisphenol A and hexafluorinated (6F) bisphenol AF produced amorphous copolymers with …
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Preparation and characterisation of Pt/C and Ni/C modified electrocatalysts for use towards the oxygen reduction reaction for proton exchange membrane fuel cells
… content to drive forward the emergence of the fuel cell technology on the market. Chapter 3 presents the preparation of Ni modified Pt/C catalysts (Ni(acac)2 and Ni(Cp)2) using the controlled surface modification technique. The resulting catalysts were heat treated at 200, 500, 750 and 900 °C …
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An investigation into the minimum dimensionality required for accurate simulation of proton exchange membrane fuel cells by the comparison between 1- and 3-dimension models.
… a reduced carbon footprint in the environment. Fuel cell (FC) technology has been studied in detail to implement hydrogen as well as other renewable sources as a feasible fuel. Further development in fuel cell design is hampered by the lack of fundamental models which reveal the physical and …
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Synthesis and characterization of purely sulphonated and composite membranes for high temperature fuel cells
Fuel cell technologies have developed high interest due to their ability to provide energy in an environmentally friendly method. Proton exchange membrane fuel cells (PEM-FCs) require a PEM for use, where the most accepted PEM used today is Nafion. Nafion is ideal due to its chemical durability and …
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Electrochemical Oxidation of Carbon Monoxide in Reformate Hydrogen for PEM Fuel Cells
… anode significantly decreases the performance of proton exchange membrane fuel cells (PEMFC). Various techniques studied to remove CO from source or mitigate CO poisoning have met with limited success due to fuel loss or increases infrastructure requirements to meet the operating needs. We …
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Development and Evaluation of a Test Apparatus for Fuel Cells
The development of a test apparatus for proton exchange membrane fuel cells is presented. The design of the prototype device is provided in detail along with a description of the apparatus. The evaluation of the functionality and effectiveness of the device included measurement of a polarization …
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