Accession Number : AD0708413

Title :   THE EFFECT OF ADSORBED LAYERS ON THE ANODIC OXIDATION OF SIMPLE ORGANIC COMPOUNDS. III. Cu ABSORPTION ON Pt AND ITS EFFECT ON THE OXIDATION OF HCOOH.

Descriptive Note : Interim technical rept. no. 7,

Corporate Author : TYCO LABS INC WALTHAM MASS

Personal Author(s) : Taylor,A. H. ; Kirkland,S. ; Brummer,S. B.

Report Date : JUL 1970

Pagination or Media Count : 23

Abstract : The adsorption and desorption of Cu on a smooth Pt electrode from 1M H2SO4 solutions which contain a range of Cu(2+) concentrations has been studied as a function of potential. The effect of adsorbed Cu on the oxidation rate of HCOOH has been examined at +0.60 V (RHE). Cu(2+) adsorption is controlled largely by an activation process. The slow step in this process is apparently the discharge of Cu(2+) at the electrode to Cu(+). Analysis of the oxidation state of the adsorbing layer by charge and coverage measurements yields a value of 1.92 electrons/site. This indicates that the major part of the layer is Cu(ads) attached to a single Pt surface site. The rate of adsorption of Cu(2+) is decreased slightly in the presence of 0.1 M HCOOH. At low coverages a slight enhancement of the HCOOH oxidation rate is observed at +0.60 V. Results are interpreted in terms of Cu(2+) adsorption mechanisms on Pt and the effect of the adsorbed layer on the mechanisms of HCOOH electrooxidation on Pt. (Author)

Descriptors :   (*FORMIC ACID, *OXIDATION), (*ELECTROCHEMISTRY, FORMIC ACID), (*ELECTRODES, *ADSORPTION), (*COPPER, ELECTROCHEMISTRY), SURFACE PROPERTIES, PLATINUM

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE