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Tuesday, August 11, 2020 | History

3 edition of Catalysts for ultrahigh current density oxygen cathodes for space fuel cell applications found in the catalog.

Catalysts for ultrahigh current density oxygen cathodes for space fuel cell applications

Catalysts for ultrahigh current density oxygen cathodes for space fuel cell applications

final report, February 1, 1989 to January 31, 1990

  • 248 Want to read
  • 30 Currently reading

Published by Case Center for Electrochemical Sciences and the Chemistry Dept., Case Western Reserve University, National Aeronautics and Space Administration in Cleveland, Ohio, [Washington, D.C .
Written in English

    Subjects:
  • Cell cathodes.,
  • Current density.,
  • Electrocatalysts.,
  • Electrode materials.,
  • Fuel cells.,
  • Lead compounds.,
  • Ruthenium compounds.

  • Edition Notes

    Statementprincipal investigators: D. Tryk, E. Yeager.
    Series[NASA contractor report] -- NASA CR-180650.
    ContributionsYeager, Ernest B., 1924-, United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL16137929M

    Fuel cell cathode catalyst layers deposited from a water-based catalyst ink formulation, using high water content and minimum volatile organic compounds, are investigated. Cathodes fabricated from a dispersion medium containing 96 wt% water are compared with cathodes fabricated from conventional alcohol-based inks containing 1-propanol– water 3: 1 (w/w).Cited by:   This reaction is key to the production of hydrogen as a fuel to be used in cars; the operation of some rechargeable batteries, including zinc-air batteries; and to generate electricity in devices called fuel cells. Two catalysts are needed for such a reaction — one that liberates the hydrogen atoms, and another for the oxygen atoms — but.

      Bimetallic catalysts platinum-cobalt, platinum-chromium, and platinum-tungsten, deposited onto highly dispersed carbon black from complex cluster-type compounds of corresponding metals with a 1: 1 atomic ratio of metals are developed. The catalysts are characterized by methods of x-ray diffraction analysis and energy dispersive analysis of x-rays. The procedure involving use of a thin-film Cited by: STRUCTURE AND CHEMISTRY OF MODEL CATALYSTS IN ULTRAHIGH VACUUM by Joshua D. Walker The University of Wisconsin-Milwaukee, Under the Supervision of Professor W. T. Tysoe The study of catalysis is a key area of focus not only in the industrial sector but also in the nature and biological systems.

    Christenn, Claudia und Schulze, Mathias und Steinhilber, Gudrun und Kaz, Till und Friedrich, Kaspar Andreas () Physical and Electrochemical Characterization of Catalysts for Oxygen Reduction in Fuel Cells. 5th International Conference on Electrocatalysis (5th ECS'06) "Aleksandar R. Despic" - From Theory to Industrial Applications, - , Kotor, by: 9.   Even minute amounts of oxygen can deactivate molecular catalyst that is added to fuel cells. Consequently, this problem has hindered the use of such a catalyst, based on copious metal; which imitates the active center of the natural biocatalyst, in technological-related applications.


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Catalysts for ultrahigh current density oxygen cathodes for space fuel cell applications Download PDF EPUB FB2

I k c,c fl / /-xr // %.O -// '7 / c- CATALYSTS FOR ULTRAHIGH CURRENT DENSITY OXYGEN CATHODES FOR SPACE FUEL CELL APPLICATIONS Final Report - February 1, to Ap Principal Investigators: D.

Tryk, Senior Research Associate E. Yeager, Hovorka Professor of Chemistry. @article{osti_, title = {Catalysts for ultrahigh-current-density oxygen cathodes for space fuel-cell applications. Final Report, 1 Feb. - 30 Apr. }, author = {Tryk, D.A. and Yeager, E.}, abstractNote = {The objective was to identify promising electrocatalyst/support systems for oxygen cathodes capable of operating at ultrahigh current densities in alkaline fuel cells.

Get this from a library. Catalysts for ultrahigh current density oxygen cathodes for space fuel cell applications: final report, February 1, to Ap [D Tryk; E Yeager; United States. National Aeronautics and Space Administration.]. At V, the cathode made with 1/20/Z °C min exhibits an increase in power density by a factor of compared with the cathode made with Cited by: Fuel cell reactions invariably involve an oxygen reduction reaction (ORR) at the cathode, which is one of the main rate-decreasing steps on platinum (Pt)-catalysts in the water formation reaction and energy conversion efficiency in polymer electrolyte membrane fuel cells (PEMFCs).

The Pt scarcity and cost haCited by: • Decrease the platinum content of the oxygen reduction catalysts in fuel cell cathodes to meet the DOE precious-metal-loading goals of g/rated kW and electrode costs of $5/kW.

• Achieve catalyst loadings of mg Pt/cm2 and stability greater than hours. • Optimize catalyst performance for low overpotentials.

Technical. Nanostructured Pt-Cu/C alloy catalysts synthesized by a reduction procedure with different reducing agents are investigated to find the origin of the enhanced activity of the oxygen reduction reaction for fuel cell applications.

Prepared catalysts are characterized by various techniques, such as energy dispersive X-ray spectrometry, X-ray Cited by:   The catalyst has good performance and promising durability for fuel cell applications. The fuel cell performance under a MPa air atmosphere at 80 °C of A cm −2 at V is especially Cited by: The cathode catalysts in low temperature fuel cells are associated with major cell efficiency losses, because of kinetic limitations of the oxygen reduction reaction.

Shingler, W. Aldred, D. Tryk, and E. Yeager, Final Report: Catalysts for Ultrahigh Current Density Oxygen Cathodes for Space Fuel Cell Applications, Contract No. NAG with NASA— Lewis Research Center, prepared by Case Center for Electrochemical Sciences, Case Western Reserve University, May, Google ScholarCited by: 6.

8 Carbon-Based, Metal-Free Catalysts for Metal–Air Batteries ionic-liquid electrolytes have been used to modif y electrochemical performance of CNT cathodes in Li–O 2 b atteries [26, 27]. Unlike oxygen ion-conducting fuel cells (OCFCs), protonic ceramic fuel cells (PCFCs) generate steam at the cathodes.

Many different catalysts have been developed for OCFC anodes; therefore, in this work, potential catalysts for steam-generating cathodes of PCFCs were by: 4. The catalysts were tested under practical fuel cell conditions.

Figure 3a shows I-V performance curves for the membrane electrode assembly (MEA) prepared using Fe/PI()III-NH 3 and Fe/PI(60)III-NH 3 as cathode catalysts. The MEA with the Fe/PI()III-NH 3 cathode showed open circuit voltages of and V under pure O 2 and air, respectively, and the current density Cited by: High energy density regenerative fuel cell systems for terrestrial applications / by: Burke, Kenneth A., Published: () A comparison of flow-through versus non-flow-through proton exchange membrane fuel cell systems for NASA's exploration missions by: Hoberecht, Mark A.

Published: (). Fuel cell membrane electrode assemblies with Pt loading of mg Pt/cm2 at the anode and ultralow Pt loadings of 6 μg Pt/cm2 and 12 μg Pt/cm2 at the cathode have been fabricated using thin films of multiwalled carbon nanotube supported Pt catalysts (Pt/MWNTs) at the cathode.

The Pt/MWNTs have a Pt weight loading of wt % and a uniform and small Pt particle size of by: An investigation of preleached PtCo/C catalysts for the oxygen reduction reaction (ORR) was carried out at 75 °C in sulphuric acid electrolyte by using a gas‐fed half‐cell in order to evaluate their stability.

The proposed research attempted to identify novel biochemical catalysts, catalyst support materials, high-efficiency electron transfer agents between catalyst active sites and electrodes, and solid-phase electrolytes in order to maximize the current density of biochemical fuel cells that utilize various alcohols as.

(A) Durability (of catalysts and membrane electrode assemblies [MEAs]) (B) Cost (of catalysts and MEAs) (C) Performance (of catalysts and MEAs) Technical Targets. This project addresses the severe corrosion and fuel cell.

cathode electrode degradation that takes place when using carbon-black-supported Pt catalysts in automotive applications. This emphasizes the importance of the water uptake in the ionomer film for reducing oxygen transport in the CL. From a fuel cell design perspective, the operation strategy and CL design to maintain high water partial pressure in the cathode CL are.

To enable the development of low temperature fuel cells, significant improvements are required to the efficiency of the Pt electrocatalysts at the cathode, where oxygen reduction takes place.

Herein, we study the effect of subsurface solute metals on the reactivity of Pt, using a Cu/Pt() near-surface alloy. Our investigations incorporate electrochemical measurements, ultrahigh vacuum.

V.D Fuel Cells / Catalysts Turner – National Renewable Energy Laboratory V– DOE Hydrogen and Fuel Cells Program FY Annual Progress Report Figure 3. Electronic conductivity of WO 3 (a) and WO x (b) with various additions of graphitized carbon nano-fibers (GCNF).

Corresponding density of each mixture is shown in (c) and (d.h, and so on. During the fuel cell operation, the cell temperature was maintained at 80°C with H 2/Air at a backpressure of psig ( psig in the actual DOE AST).

The gas stoichiometry was controlled at / (/ in DOE AST) for hydrogen and air, with respect to the operating current densities.Advanced Cathode Catalysts Subject: This presentation, which focuses on advanced cathode catalysts, was given by Piotr Zelenay of Los Alamos National laboratory at a February meeting on new fuel cell projects.

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