Abstract: Avariety of nonlinear phenomena, which was observed during the electrochemical oxidation of ethanol and methanol at a platinized platinum electrode, is described. The cyclic voltammetric responses of ethanol and methanol that are oxidized at a platinized platinum working electrode in alkaline medium with Na₂MoO₄show the periodic and aperiodic cyclic voltammetric oscillatory behavior. The periodic and aperiodic cyclic voltammetric oscillatory responses were obtained under given experiment conditions. The period of oscillation can be controlled by changing little low potential limit. The alkalinity has an important effect on the oscillation. The periodic oscillations appear when the concentration of ethanol vary between 0.5 mol/Land 1.0 mol/Land the solution contain Na₂MoO₄. Without Na₂MoO₄in the solution, the oscillation doesnt appear in such an alkalinity. The periodic and aperiodic oscillation have the properties of chaos. We consider that the nonlinear behavior is the surface.

Key words: Electrochemical oscillation, Chaos, Nonlinearity