Accession Number : AD0698311

Title :   THE EFFECT OF ADSORBED LAYERS ON THE ANODIC OXIDATION OF SIMPLE ORGANIC COMPOUNDS. 1. TIME VARIATIONS DURING THE OXIDATION OF HCOOH AND THE EFFECT OF ADDED Cl(-).

Descriptive Note : Interim technical rept. no. 5,

Corporate Author : TYCO LABS INC WALTHAM MASS

Personal Author(s) : Taylor,A. H. ; Pearce,R. D. ; Brummer,S. B.

Report Date : NOV 1969

Pagination or Media Count : 18

Abstract : The deterioration of currents with time (time effects) during the oxidation of 0.1M HCOOH on Pt electrodes in 1M H2SO4 at 40C has been examined. The effect of added Cl(-) on the HCOOH oxidation rate at 0.65 and 0.75 V (versus RHE) has been studied. HCOOH oxidation currents have been measured at 0.75 V (versus RHE) as a function of HCOOH purity. The current decays with time; results indicate that this decay is, to a large extent, due to an anionic type impurity in the solution. This impurity is present at very low levels and the behavior is similar to that with a solution containing 5 x 10 to the -7th M Cl(-). Results are reported for HCOOH oxidation at 0.65 and 0.75 V (versus RHE) as a function of Cl(-) concentration. The reaction is extensively inhibited by increased addition of Cl(-) as a direct consequence of Cl(-) adsorption on the electrode. These observations imply that the electroactive species in HCOOH oxidation at these potentials is HCOO(-). (Author)

Descriptors :   (*FORMIC ACID, *OXIDATION), (*ELECTROCHEMISTRY, FORMIC ACID), (*ELECTRODES, ADSORPTION), CHLORIDES, SURFACE PROPERTIES, IMPURITIES

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE