Accession Number : AD0489312

Title :   REVERSIBLE OXYGEN ELECTRODES.

Descriptive Note : Quarterly rept. no. 4, 15 Jan-14 Apr 66,

Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA ELECTROCHEMISTRY LAB

Personal Author(s) : Wong, K. ; Sepa, D. ; Damjanovic, A. ; Gileadi, E.

Report Date : APR 1966

Pagination or Media Count : 37

Abstract : The rate of electroreduction of oxygen on Pt in alkaline solutions was found to be reduced in the presence of Ba and Cs ions. The effect of the bivalent Ba ions is larger than that of Cs ions. Both ions accelerate the rate of reduction of peroxide ion HO2 to OH ions. Sulfate ions at 0.6 volt accelerate and at 0.2 volt decrease the rate of reduction of HO2 ions. Chloride ions generally decrease the rate, while fluoride ions were found to have essentially no effect in alkaline solutions up to a concentration of 0.1 N. A new type of electrode materials, known as bronzes, proved to be fairly active for O2 reduction in acid solutions, particularly at higher pH values (pH = 2). The potential in respect to N.H.E. at a given current density is pH independent. (Author)

Descriptors :   *OXYGEN), (*ELECTRODES, FUEL CELLS, ELECTROCHEMISTRY, IONS, REDUCTION(CHEMISTRY), SOLUTIONS(MIXTURES), ENERGY CONVERSION, REACTION KINETICS, HYDROXIDES, CATALYSTS, TUNGSTEN COMPOUNDS, OXIDES.

Subject Categories : Inorganic Chemistry
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE