Application of Cyclic Voltammetry to the Kinetic Study of Electro-Oxidation of Organic Compounds

Abstract

Information concerning the kinetics of electro ‐oxidation of methanol and formic acid in acid solution at a stationary platinum electrode can be obtained from the study of cyclic voltamgrams. The voltamgrams are obtained by recording the current density of the working electrode while its potential is scanned back and forth at constant rate between adequate potentials. The analysis of the shape of cyclic voltamgrams and of the effect of the rate of scanning on this shape sustains the hypothesis that the electro‐oxidation of organic compounds to carbon dioxide and water is limited by the rate of formation of some intermediate platinum‐carboxo surface compound. The thermodynamic yield of the electrode reaction seems to be limited by the stability of this intermediate compound.

Electronic Properties of Conjugated Polyelectrolyte Thin Films

“…Cyclic voltammetry (CV) studies have been carried out on CPEs and have shown no difference in the energy levels for a given backbone, whether the pendant groups are charged or not (Supporting Information). However, this information is obtained in contact with solution and in the presence of an electrolyte . The situation in neat films is thus expected to be different.…”

The Mechanism of Electrochemical Oxidation of Organic Fuels

“…At high values of the coverage where ()eq ~ 1, this reduces to i = k exp (-~~) exp ~::) (164) Differentiating equation (164) with respect to time at constant potential one has hence and…”

Benchmarking Catalysts for Formic Acid/Formate Electrooxidation

“…Pt was the first metal catalyst employed in the FA electrooxidation reaction [ 29 , 35 , 36 , 37 , 38 ], before Pd [ 39 ] or any other metal [ 30 ], and it is one of the most widely studied catalysts to date. As mentioned above, it is generally accepted that formic acid/formate oxidation follows a dual-pathway mechanism composed of a main reaction pathway (known as direct or primary pathway) where formic acid/formate is oxidized to CO 2 through a reactive intermediate and an indirect or secondary pathway involving an adsorbed poisoning species.…”