Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 43 for “"Direct Methanol"”.
-
Direct Methanol Fuel Cells Using Pure Methanol
… gas emissions. Of the various fuel cell types, direct methanol fuel cells (DMFCs) hold a set of distinct advantages for stationary and small portable applications. These advantages include faster refueling compared to battery charging, high gravimetric energy density, and ease of production and …
-
Direct methanol fuel cell catalysts with controllable interface
… for room temperature electrooxidation of methanol to prove the existence of Pt-oxophilic metal pair sites and to delineate their contributions to methanol eletrooxidation by bifunctional catalysis. Model bimetallic and multi-component catalysts with customizable and easily identifiable …
-
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 …
-
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 …
-
Design of high-ionic conductivity electrodes for direct methanol fuel cells
… 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 a small fraction of the catalyst facilitates the bulk of the oxidation reaction. In this thesis, the porous carbon …
-
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 …
-
NICKEL HYDROXIDE NANORIBBONS FOR EFFICIENT WATER SPLITTING AND DIRECT METHANOL FUEL CELL
Oxygen evolution reaction (OER) and methanol oxidation reaction (MOR) are very important reactions in hydrogen harvesting system and direct methanol fuel cell (DMFC). However, these two reactions are sluggish processes, due to the multi-proton coupled reactions. In this work, we report the first …
-
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 …
-
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 …
-
Synthesis and characterization of cathode catalysts for use in direct methanol fuels cells
In this work a modified polyol method was developed to synthesize in-house catalysts. The method was modified for maximum delivery of product and proved to be quick and efficient as well as cost effective. The series of IH catalysts were characterized using techniques such as UV-vis and FT-IR …
-
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 …
-
Synthesis and characterisation of proton conducting membranes for direct methanol fuel cell (DMFC) applications
For a direct methanol fuel cell (DMFC), the proton exchange membrane must conduct protons and be a good methanol barrier. In addition to the high methanol permeability achieved by these membranes, they are very expensive and contribute greatly to theoverall cost of fuel cell set up. The high cost …
-
Investigation of Novel Electrolytes for Use in Lithium-Ion Batteries and Direct Methanol Fuel Cells
… use as a proton exchange membrane electrolyte in direct methanol fuel cells. The characterization of these novel electrolytes is a step towards the development of the next generation of improved energy storage and energy conversion devices.</p>
-
Direct methanol fuel cell with extended reaction zone anode : PtRu and PtRuMo supported on fibrous carbon
The direct methanol fuel cell (DMFC) is considered to be a promising power source for portable electronic applications and transportation. At present there are several challenges that need to be addressed before the widespread commercialization of the DMFC technology can be implemented. The …
-
Electrochemical investigation of platinum nanoparticles supported on carbon nanotubes as cathode electrocatalysts for direct methanol fuel cell
… Pt/LPGMWCNT also showed better tolerance toward methanol, however it was not highly active towards methanol, and hence the methanol oxidation peak current observed between 0.75 and 08 potential was the smallest. In this study a wide range of instruments was used to characterize the properties and …
-
Performance Characteriztion and Modeling of a Passive Direct Methanol Fuel Cell (DMFC) over a Range of Operating Temperatures and Relative Humidities
… 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 passive air breathing direct methanol fuel cell would be ideal. However, successful use of the passive DMFC in …
-
The development of inorganic and organic/inorganic membranes for DMFC application
… cells, namely the hydrogen fuel cell and the direct methanol fuel cell are preferred amongst other fuel cell types for stationary and vehicular applications, due to their small size and their low operating temperature. The direct methanol fuel cell has several advantages over the hydrogen fuel …
-
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.
-
Preparation and Catalytic Properties of Supported Nanoscale Metal Particles
… were active catalysts for the decomposition of methanol to CO and H$\sb2,$ but the catalyst derived from $\rm Pt\sb2Ru\sb4(CO)\sb{18}$ displayed enhanced activity and stability. The behavior of these materials as thermal catalysts is expected to relate to their behavior as electrooxidation …
Page 1 of 3