Preparation and Evaluation of Advanced Electrocatalysts for Phosphoric Acid Fuel Cells PDF Download
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781724683731
Category :
Languages : en
Pages : 28
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Book Description
The highest performance fuel cell cathode electrocatalyst combination ever observed gives 755 mV vs hydrogen at 100 ASF on air at 180 C and shows a potential improvement to 775 mV vs hydrogen for better electrode structures. A pressurized fuel cell (UTC at 5 atm) would then give 805 mV at 320 ASF and 180 C. Another activity diagnostic is the performance of this electrocatalyst on oxygen at 900 mV vs hydrogen. The value for electrocatalyst is 44 mA per milligram of platinum and is projected to reach 60 mA per milligram of platinum with improved electrode structures. Since the electrocatalyst surface area and the electrode structure are not yet optimized there is considerable room for performance enhancement beyond these values, especially at higher temperatures. Stonehart, P. and Baris, J. and Hochmuth, J. and Pagliaro, P. Unspecified Center NASA-CR-165425, DOE/NASA/0176-81/2, QR-6 DEN3-176; DE-A103-80ET-17088
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781724683731
Category :
Languages : en
Pages : 28
Get Book Here
Book Description
The highest performance fuel cell cathode electrocatalyst combination ever observed gives 755 mV vs hydrogen at 100 ASF on air at 180 C and shows a potential improvement to 775 mV vs hydrogen for better electrode structures. A pressurized fuel cell (UTC at 5 atm) would then give 805 mV at 320 ASF and 180 C. Another activity diagnostic is the performance of this electrocatalyst on oxygen at 900 mV vs hydrogen. The value for electrocatalyst is 44 mA per milligram of platinum and is projected to reach 60 mA per milligram of platinum with improved electrode structures. Since the electrocatalyst surface area and the electrode structure are not yet optimized there is considerable room for performance enhancement beyond these values, especially at higher temperatures. Stonehart, P. and Baris, J. and Hochmuth, J. and Pagliaro, P. Unspecified Center NASA-CR-165425, DOE/NASA/0176-81/2, QR-6 DEN3-176; DE-A103-80ET-17088
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ISBN:
Category :
Languages : en
Pages : 71
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Author:
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ISBN:
Category :
Languages : en
Pages :
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The overall objective of this electrocatalysis program was to define the feasibility of lowering the electrocatalyst cost and to increase the electrocatalyst activity in phosphoric acid fuel cells to improve the commercial viability of fuel cells for producing electric power. Highly dispersed platinum was placed on carbon supports. These catalysts were characterized for both the platinum surface areas and crystallite sizes. For a given carbon impregnation technique with the noble metal salt, a definite correlation between the specific surface area of the derived platinum crystallites and the BET surface area of the carbon support was found. A high dispersion of platinum was achieved on a novel high surface area catalyst support - CONSEL. Using high resolution phase contrast electron microscopy, the crystal lattice of highly dispersed platinum on carbon was resolved and, with the lattice images of graphitic carbon black as an internal calibration, the lattice spacing for a small crystallite of platinum was measured within 2% of the value for bulk platinum. Twenty-one catalysts were formulated with variations in the type of carbon support, the platinum metal loading, and the platinum crystallite size. Characteristics and test results are described. (WHK).
Author:
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Category : Power resources
Languages : en
Pages : 664
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Author:
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ISBN:
Category :
Languages : en
Pages :
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Highly dispersed platinum has been placed on carbon supports so that they may be used as phosphoric acid fuel cell electrocatalysts. These catalysts were characterized for both the platinum surface areas and crystallite sizes. For a given carbon impregnation technique with the noble metal salt, a definite correlation between the specific surface area of the derived platinum crystallites to the BET surface area of the carbon support was found.
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ISBN:
Category : Aeronautics
Languages : en
Pages : 1148
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Author: Francisco Javier RodrÃguez-Varela
Publisher: Springer
ISBN: 3319990195
Category : Science
Languages : en
Pages : 302
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This book introduces the reader to the state of the art in nanostructured anode and cathode electrocatalysts for low-temperature acid and alkaline fuel cells. It explores the electrocatalysis of anode (oxidation of organic molecules) and cathode (oxygen reduction) reactions. It also offers insights into metal-carbon interactions, correlating them with the catalytic activity of the electrochemical reactions. The book explores the electrocatalytic behaviour of materials based on noble metals and their alloys, as well as metal-metal oxides and metal-free nanostructures. It also discusses the surface and structural modification of carbon supports to enhance the catalytic activity of electrocatalysts for fuel-cell reactions.
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Category : Aeronautics
Languages : en
Pages : 310
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ISBN:
Category : Fuel
Languages : en
Pages : 476
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Author:
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ISBN:
Category : Fossil fuels
Languages : en
Pages : 820
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