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.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1970
- Accession Number
- AD0708413
Entities
People
- A. H. Taylor
- S. B. Brummer
- S. Kirkland