Abstract: Under the lab-condition of temperature controlled by heat compensation, the fictitious isothermal electrochemical oscillation in type of limit cycle will degenerate owing to the undulation of temperature in the range allowed by controlled accuracy. In this paper we show that the Pt-electrode BZ reaction system under the lab-condition of temperature controlled can be reduced to a three-variables dynamic system with two slow varying parameters. Furthermore, by a linearized stability analysis for the quasi-steady states of this kind of electrode reaction system on the slow-manifold, it turns out that in every undulating period of the temperature the corresponding quasi-steady state shuttle back and forth between both the oscillation regime and the non-oscillation regime a long with the slow variation of the temperature of the thermostat. As a result, a kind of intermittent torus-like oscillation will appear in this system. The argument formed in this paper was verified by computerized simulation.

Key words: Pt-electrode BZ reaction system, Temperature controlling of heat compensation type, Limit-cycle electrochemical oscillation, Torus-like electrochemical oscillation