THE BEHAVIORS OF PERFLUORINATED SURFACTANTS AT PLATINUM-ELECTRODE

The electrochemical behaviors of perfluorinated anionic (FC-99), catio nic (FSD), and nonionic (FSN) surfactants (SAS) were studied at the Pt electrode in dilute H2SO4 solutions by measuring the effects of vario us types of SAS on the adsorption/desorption of atomic H, the formatio n of O-ad, and the double layer capacitance of the electrode-electroly te interface, together with their inhibiting effects on the kinetics o f oxygen reduction, methanol oxidation, and oxygen evolution processes . Differences in the electrochemical behaviors of the various types of perfluorinated SAS are discussed in correlation with the chemical str ucture of the hydrophilic parts of the SAS molecules and their electro static interaction with the surplus charge at the surface of the elect rode.