Accession Number : AD0803439

Title :   REVERSIBLE OXYGEN ELECTRODES.

Descriptive Note : Quarterly rept. no. 5, 15 Apr-14 Jul 66,

Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA ELECTROCHEMISTRY LAB

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

Report Date : OCT 1966

Pagination or Media Count : 158

Abstract : The mechanism of oxygen reduction at Pt electrodes in acid(1 N an 0.1 N H2SO4) solutions is greatly affected by the presence of Cl(-) ions in the solution. The path changed from one in which O2 is reduced to H2O to the path in which O2 is reduced to H2O2. Tungsten bronzes are found to operate also after prolonged polarization. Depolarization of tungsten bronzes after long (20 days) polarization is probably due to residual impurities in the solution. When the solution is changed, the electrode potential for a given current density recovers its initial value. Fe(2+)/Fe(3+) and Tl(+)/Tl(3+) redox couples are considered as possible redox catalysts for oxygen reduction. The rates of electrode reactions for both couples are sufficiently high. (Author)

Descriptors :   *ENERGY CONVERSION), (*FUEL CELLS, (*ELECTRODES, FUEL CELLS), (*OXYGEN, REDUCTION(CHEMISTRY)), (*ELECTROCHEMISTRY, FUEL CELLS), SULFURIC ACID, SOLUTIONS(MIXTURES), CATALYSTS, PLATINUM, TUNGSTEN ALLOYS, BRONZE, OXIDATION REDUCTION REACTIONS, HYDROGEN PEROXIDE.

Subject Categories : Physical Chemistry
      Electric Power Production and Distribution

Distribution Statement : APPROVED FOR PUBLIC RELEASE