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(-).
Interim technical rept. no. 5,
TYCO LABS INC WALTHAM MASS
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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
- Physical Chemistry