Accession Number:

AD0442413

Title:

A STUDY OF THE ADSORPTION MECHANISMS ON OXYGEN ELECTRODES.

Descriptive Note:

Rept. no. 4 (Final) 6 Sep 62-5 Mar 64,

Corporate Author:

WESTINGHOUSE RESEARCH LABS PITTSBURGH PA

Personal Author(s):

Report Date:

1964-03-05

Pagination or Media Count:

56.0

Abstract:

Different type of oxygen chemisorption were found on silver and their proxerties were investigated. Other materials studied were silvergold alloys, palladium and platinum. Pressuretemperature scans, various types of isotopic exchange reactions, measurements of desorption rates and the magnetic ortho-para conversion of hydrogen were used to obtain information on the modes of adsorxtion. At least two types of oxygen chemisorption, differing considerably in binding energy and presumably in their coordination with silver atoms, contribute to the exchange reaction between 016 and 018 above 160 C, but only the weaker chemisorption is directly involved in the adsorption-desorption process. Some firmly bound oxygen is located below the surface. The rate of desorption is affected by high-temperature pretreatment with oxygen. Hydrogen pretreatment at high temperatures produces very firmly bound hydroxyl groups which change the activation energy of the desorption process. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE