Stories
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Briefs: Physical Sciences
In a proposed direct methanol fuel-cell electric-power-generating system, the fuel-cells would consume neat methanol, in contradistinction to the dilute aqueous methanol solutions consumed in...
Briefs: Materials
A sol-gel process has been developed as a superior alternative to a prior process for making platinum-ruthenium alloy catalysts for electro-oxidation of methanol in fuel cells. The starting...
Briefs: Energy
Two perfluoroalkanesulfonic acids and perfluoroalkanesulfonimides have shown promise as anodecoating materials for improving the performances of direct methanol fuel cells (DMFCs)....
Briefs: Electronics & Computers
An improved cathode structure on a membrane/electrode assembly has been developed for a direct methanol fuel cell, in a continuing effort to realize practical power systems containing...
Briefs: Electronics & Computers
A modified chemical composition has been devised to improve the performance of the anode of a direct methanol fuel cell. The main feature of the modified composition is the incorporation of hydrous...
Briefs: Materials
A relatively economical method of chemical vapor deposition (CVD) has been developed for synthesizing diamond crystals and films. Unlike prior CVD methods for synthesizing diamond, this method does not...
Briefs: Electronics & Computers
Lightweight Stacks of Direct Methanol Fuel Cells
An improved design concept for direct methanol fuel cells makes it possible to construct fuel-cell stacks that can weigh as little as one-third as much as do conventional bipolar fuel-cell stacks of equal power. The structural-support components of the improved cells and stacks can be made of...
Briefs: Electronics & Computers
Direct Methanol Fuel Cells for Low-Power Applications
Direct methanol fuel cells integrated with fuel reservoirs have been proposed as power sources in applications that involve power demands up to about 50 W. A prior concept of direct methanol fuel cells as alternatives to re- chargeable batteries in such applications was reported previously in...
Briefs: Materials
Some changes have been made in the fabrication of PSSA/ PVDF-based membrane/electrode assemblies for direct methanol fuel cells. The effect of the changes is to improve the electrochemical...
Briefs: Materials
The fabrication of membrane/electrode assemblies (MEAs) for direct methanol fuel cells can be modified to make the cathodes hydro- phobic. These modifications improve the performances of the...
Briefs: Materials
A class of developmental membrane electrolyte materials for methanol/air and hydrogen/air fuel cells is exemplified by a composite of (1) a melt-processable polymer [in particular,...
Briefs: Electronics & Computers
Miniature fuel cells in a “flat-pack” configuration are being developed as alternatives to recharge- able batteries in cellular telephones, laptop computers, and other small,...
Briefs: Materials
Scientists at NASA's Jet Propulsion Laboratory are developing apparatuses for electrolysis of methanol to produce pure hydrogen for use at industrial sites, in scientific laboratories, and in fuel...
Briefs: Physical Sciences
Direct methanol fuel cells that would function with aerosol feed (instead of all-gas or all-liquid feed) have been proposed. As explained below, aerosol feed would afford the advantages of liquid...
Briefs: Energy
A number of matrix resins that contain thermosetting plasticizers have been developed for use in the resin-transfer molding (RTM) of composite-material (fiber/matrix) parts. These...
Briefs: Materials
Improved polymer electrolyte membranes for direct methanol fuel cells can be made by impregnating the baseline membrane material with cross-linked polystyrene (a copolymer of styrene...
Briefs: Materials
An improved method of fabricating electrodes for fuel cells includes the use of sputtering to deposit thin layers of catalytic electrode metals. Previously, catalytic electrode metals...
Briefs: Materials
Proton-conductive (solid-electrolyte) membranes made from sulfonated poly(phenylether sulfone), plus membrane/electrode assemblies containing these membranes, have been developed for use...
Briefs: Electronics & Computers
Relatively inexpensive, lightweight biplates for methanol fuel cells have been proposed. The reductions in weight and cost, relative to biplates now used in methanol fuel cells, would be...
Briefs: Physical Sciences
Improved HSPES-Based MEAs for Methanol Fuel Cells
Improved membrane/electrode assemblies (MEAs) made partly from hydrogen form of sulfonated polyether sulfone (HSPES) have been developed for use in methanol fuel cells. In comparison with traditional fuel-cell MEAs made partly from a commercial perfluorosulfonic acid-based polymer, these MEAs...
Briefs: Materials
Improved polymer electrolyte membranes for direct methanol fuel cells can be made by any of a variety of processes in which cross-linked polystyrene sulfonic acid (PSSA) is...
Briefs: Materials
An improved method of fabricating membrane electrode structures for methanol fuel cells is similar to the method described in the preceding article, except that in this method, the...
Briefs: Physical Sciences
A robust sensor based on the electrochemical oxidation of methanol has been developed for use in measuring the concentration of methanol dissolved in water. The sensor is expected to be...
Briefs: Materials
A method of fabricating membrane electrode structures for methanol fuel cells involves, among other things, the use of improved sprayers to deposit inks containing catalytic metals on...
Briefs: Mechanical & Fluid Systems
A surface-micromachining process has been devised for use in fabricating microscopic polycrystalline diamond structures (e.g., bridges and cantilevers) as integral parts...
Briefs: Physical Sciences
Methanol-Fuel-Cell Biplate Improved for Removal of Water
An improved design for a biplate in a methanol fuel cell provides increased efficiency in the removal of water, relative to older designs. For reasons explained below, this design both improves the performance of the fuel cell and increases the overall energy efficiency of the...
Briefs: Electronics & Computers
Focal-plane-array (FPA) hybrids of quantum-well infrared photodetectors (QWIPs) thinned to the membrane level are undergoing development. The developmental QWIPs in question are of the...
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