Accession Number : AD0647691

Title :   EFFECTS OF PH ON THE ELECTROSORPTION OF OXYGEN ON FUEL CELL ELECTRODES.

Descriptive Note : Research and development rept.,

Corporate Author : NAVY MARINE ENGINEERING LAB ANNAPOLIS MD

Personal Author(s) : Icenhower,D. E. ; Urbach,H. B. ; Harrison,J. H.

Report Date : JAN 1967

Pagination or Media Count : 36

Abstract : A new potential-step method was used to determine oxygen coverage on platinum, gold, and rhodium. The procedure was based, in part, on the use of a novel electronic coulometer. Experimental evaluation of the coverage and its theoretical interpretation were obtained by the use of the potential-step method in conjunction with the potential-sweep method. The pH was found to have profound effects upon the oxygen coverage. In general, increasing pH increases the degree of coverage by oxygen-containing species. This effect may be correlated with the amphoteric properties of bulk metals wherein it is observed that pH influences the formation of hydroxide species and finally the reaction of the hydroxide species to form oxides. The hydroxide species appears to represent an intermediate in the formation of the oxide. The oxygen coverage on platinum is a linear function of potential above 0.8 volt. (Author)

Descriptors :   (*PH FACTOR, *ELECTROCHEMISTRY), (*FUEL CELLS, OXYGEN), ELECTRONIC EQUIPMENT, ELECTRODES, OXIDATION, TIME, PLATINUM, HYDROXIDES, ADSORPTION

Subject Categories : Physical Chemistry
      Electrical and Electronic Equipment
      Electric Power Production and Distribution

Distribution Statement : APPROVED FOR PUBLIC RELEASE