NDLI: Cathode catalysts for primary phosphoric acid fuel cells

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Cathode catalysts for primary phosphoric acid fuel cells

Content Provider	NASA Technical Reports Server (NTRS)
Copyright Year	1981
Description	Alkylation or carbon Vulcan XC-72, the support carbon, was shown to provide the most stable bond type for linking cobalt dehydrodibenzo tetraazannulene (CoTAA) to the surface of the carbon; this result is based on data obtained by cyclic voltammetry, pulse voltammetry and by release of 14C from bonded CoTAA. Half-cell tests at 100 C in 85% phosphoric acid showed that CoTAA bonded to the surface of carbon (Vulcan XC-72) via an alkylation procedure is a more active catalyst than is platinum based on a factor of two improvement in Tafel slope; dimeric CoTAA had catalytic activity equal to platinum. Half-cell tests also showed that bonded CoTAA catalysts do not suffer a loss in potential when air is used as a fuel rather than oxygen. Commercially available polytetrafluroethylene (PTFE) was shown to be unstable in the fuel cell environment with degradation occurring in 2000 hours or less. The PTFE was stressed at 200 C in concentrated phosphoric acid as well as electrochemically stressed in 150 C concentrated phosphoric acid; the surface chemistry of PTFE was observed to change significantly. Radiolabeled PTFE was prepared and used to verify that such chemical changes also occur in the primary fuel cell environment.
File Size	2205228
Page Count	62
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19820013835
Archival Resource Key	ark:/13960/t5hb3z545
Language	English
Publisher Date	1981-12-01
Access Restriction	Open
Subject Keyword	Energy Production And Conversion Polyethylenes Phosphoric Acid Stability Voltmeters Cell Cathodes Electrocatalysts Phosphoric Acid Fuel Cells Cobalt Alkylation Platinum Electrochemistry Ligands Bonding Thermal Stresses Isotopic Labeling Thermal Degradation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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