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Showing 1 to 20 of 21 for “"Direct Methanol Fuel Cells"”.
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Direct Methanol Fuel Cells Using Pure Methanol
<p>Fuel cell technology has attained significant appeal as a form of renewable energy in recent years due to its diverse applications, various fuel types, and lower greenhouse gas emissions. Of the various fuel cell types, direct methanol fuel cells (DMFCs) hold a set of distinct advantages for …
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Polymer electrolyte membranes for direct methanol fuel cells
… polymer electrolyte membranes (PEMs) for direct methanol fuel cells (DMFCs). In this thesis, relatively inexpensive monomers, 2-acrylamido-2-methyl propanesulfonic acid (AMPS) and 3-sulfopropyl methacrylate (SPM) in particular, were deployed as the proton source in a predominantly …
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Design of high-ionic conductivity electrodes for direct methanol fuel cells
… porous electrodes are used in low-temperature fuel cells to provide maximum catalyst surface area, while taking up little volume and using minimum catalyst material. In Direct Methanol Fuel Cells (DMFCs), however, much of the catalyst included in the anode is significantly under-utilized, while …
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Experimental and Numerical Investigations of Tubular-Shaped Direct Methanol Fuel Cells (DMFCs)
… the novel, passively operated, tubular-shaped, Direct Methanol Fuel Cell (DMFC) as an alternative geometry to the traditional planar-shaped fuel cell. The benefit of the tubular geometry compared to the planar geometry is the higher instantaneous volumetric power density provided by the larger …
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Porous Silicon as a Proton Exchange Membrane for Direct Methanol Fuel Cells
Direct Methanol Fuel Cells (DMFCs) show the most potential in efficient chemical to electrical energy conversion having approximately half the specific energy compared to gasoline at 5.54 kW-hr/kg (19.9 MJ/kg). With a density of 0.792 kg/L, methanol?s energy density is 4.39 kW-hr/L. By designing a …
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Preparation and characterisation of Pt-Ru/C catalysts for direct methanol fuel cells
The direct methanol fuel cell (DMFC) is identified as a promising fuel cell for portable and micro fuel cell applications. One of the major benefits is that methanol is an energy dense, inexpensively manufactured, easily stored and transported, liquid fuel (Hamann et al., 2007). However, the DMFC's …
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Investigation of Novel Electrolytes for Use in Lithium-Ion Batteries and Direct Methanol Fuel Cells
… novel electrolytes for secondary batteries and fuel cells have been studied using nuclear magnetic resonance and high pressure x-ray scattering techniques to form a better understanding of dynamic and structural properties of these materials. Ionic liquids have been studied due to their …
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Polymer/nano-organic composite proton exchange membranes for direct methanol fuel cell application
… proton exchange membrane is one key component of direct methanol fuel cells, which has double functions of conducting protons, separating fuels and oxidant. At present, the performance and price of sulfonic acid proton exchange membrane used in direct methanol fuel cells are deeply concerned. In …
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Membranen aus [(A)n(B)m]x-Multiblockcopolymeren für den Einsatz in der Direkt-Methanol-Brennstoffzelle (DMFC)
… of sulfonation have been prepared for use in direct methanol fuel cells.
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Tuning the transport properties of layer-by-layer thin films for fuel cell applications
… energy sources has led to a renewed interest in fuel cells. For low power, portable applications, direct methanol fuel cells (DMFCs) are the most promising type of fuel cell. DMFCs can operate at ambient conditions and only require dilute methanol solutions and air to be input to the devices. At …
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Polymeric and Polymer/Inorganic Composite Membranes for Proton Exchange Membrane Fuel Cells
… 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 benchmark membrane for both …
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Performance Characteriztion and Modeling of a Passive Direct Methanol Fuel Cell (DMFC) over a Range of Operating Temperatures and Relative Humidities
… and more effective means of energy production, fuel cells become increasingly more popular. While different fuel cells are already found in industry today, the direct methanol fuel cell (DMFC) is becoming an increasingly more probable means for portable power production. In such applications a …
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Engineering carbide nanoparticles coated with noble metal monolayers for catalysis
… noble metal monolayers. This offers new directions for improved catalyst designs by substantially enhancing reactivity and stability while reducing overall noble metal loadings. These synthetic achievements in nanoscale core-shell catalyst engineering were guided by computational quantum …
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Multiphase Modeling of a Flowing Electrolyte-Direct Methanol Fuel Cell
Direct methanol fuel cells (DMFCs) are considered one of the leading contenders for low power applications due to their energy dense, liquid fuel and their low greenhouse gas emissions. However, DMFCs have lower than predicted performance due to methanol crossover. One proposed solution is to allow …
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Synthesis, crosslinking and characterization of disulfonated poly(arylene ether sulfone)s for application in reverse osmosis and proton exchange membranes
… osmosis (RO) membranes for application in fuel cell and water purification respectively were developed by synthesis and crosslinking of disulfonated biphenol-based poly (arylene ether sulfone)s (BPS). Crosslinking is a prospective option to reduce the water swelling and improve the …
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Synthesis and Characterization of Disulfonated Poly(Arylene Ether Sulfone) Random Copolymers as Multipurpose Membranes for Reverse Osmosis and Fuel Cell Applications
… ether) random copolymer membranes in fuel cell and reverse osmosis applications. Poly(arylene ether)s were prepared by direct step copolymerization using a third monomer 3,3–-disulfonated 4,4–-dichlorodiphenylsulfone. The membrane properties of a 4,4–-biphenol-based disulfonated poly …
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Designing Electrocatalysts for the Production and Oxidation of Liquid Fuels
… it is paramount to cease reliance on fossil fuels to meet global energy demands. While the cost of electricity from renewable sources, such as solar and wind, continues to decrease and has even fallen below that of fossil fuels since 2014, these renewable energy sources suffer from …
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Effect of Backbone Structure on Membrane Properties for Poly(arylene ether) Random and Multiblock Copolymers
… One multiblock copolymer system was for H2/air fuel cells, and the other for direct methanol fuel cells (DMFCs). The H2/air fuel cells operate under harsh conditions and varying levels of relative humidity, while the DMFCs operate in an aqueous environment with a methanol-water mixture …
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Controlling the mechanical and transport properties of layer-by-layer films and electrospun mat composite membranes for fuel cell applications
… need for clean, portable energy devices, such as fuel cells and high energy batteries to replace or reduce the world's dependence on fossil fuels. The continued development of thin-film solid polymer electrolytes with improved mechanical and ion transport properties is critical for the further …
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High Performance Disulfonated Poly(arylene Sulfone) Co- and Terpolymers For Proton Exchange Membranes For Fuel Cell And Transducer Applications: Synthesis, Characterization And Fabrication Of Ion Conducting Membranes
… exchange membranes (PEM) for hydrogen-air and direct methanol fuel cells (DMFC) that perform as well or better than the state of the art Nafion perfluorosulfonic acid membrane. Direct aromatic nucleophilic substitution polycondensations of disodium 3,3′ S-disulfonate-4,4′ …
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