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Understanding the onset of those non-equilibrium phenomena in electrochemical reactions has far reaching impacts. The observation of Turing-type patterns on electrode surfaces，for example，points to a prospective exploitation of pattern-forming mechanism to manufacture structured electrodes similar of those being developed for the(bio)sensors.Strasser and co-workers have classified electrochemical oscillations into fourcategories. According to their methods，the double-layer potential is a negative feedback variable for N-NDR(Negative Differential Resistance)and HN-NDR(Hidden Negative Differential Resistance)oscillators，but it isnot necessary for strictly potentiostatic oscillator. Therefore，the study of nonlinear phenomena can provide newinsight into the mechanism of electrochemical reaction.