关键词: 电极B-Z反应系, 双电层稀疏区电势跃变, 滞后性与耗散, 电化学振荡

Abstract: On the basis of a perfect analysis of the dissipations in the successive steps of a steady Pt- electrode B-Z reaction processes, the hesitation of electro-chemical step comparing with the diffusion step was expressed quantitatively by their contributions to the dissipation of electrode chemical reaction system. A theory of non-equilibrium thermodynamics of the potential jump ψ across the loose region of double electric layer was established. Consequently, an explicit formula for the calculation of ψ was given under the approximation of Boltzmann distribution. Meanwhile, a generalized dynamical model for Pt electrode B-Z reaction was suggested, by means of which the influence of ψ on the evolutionary dynamic behavior is further discussed in this paper. It turns out that the existence of ψ will further increase the non-linearity of dynamical mechanism of this electrode chemical reaction system. As one of the important results, it will degenerate the electro-chemical oscillation region. The corresponding degeneration of phase region favorable to the electro-chemical oscillation was plotted explicitly on the plane of externally controlled parameter-intrinsic parameter, simultaneously together with a computer simulation.

Key words: Pt Electrode B-Z reaction, Potential jump ψ across the loose region of double electrical layer, Hesitation and Dissipation, Electro-chemical oscillation