Li Y J, Oslonovitch J, Mazouz N, Plenge F, Krischer K, Ertl G
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany.
Science. 2001 Mar 23;291(5512):2395-8. doi: 10.1126/science.1057830. Epub 2001 Feb 22.
We report stationary, nonequilibrium potential and adsorbate patterns with an intrinsic wavelength that were observed in an electrochemical system with a specific type of current/electrode-potential (I-phi(DL)) characteristic. The patterns emerge owing to the interplay of a self-enhancing step in the reaction dynamics and a long-range inhibition by migration currents rather than by diffusion. Theoretical analysis revealed that this self-structuring of the electrode occurs in all electrochemical systems with an S-shaped I-phi(DL) characteristic in wide and well-accessible parameter ranges. This unusual pattern-forming instability in electrochemical systems has all the characteristics of the mechanism proposed by Turing in 1952 in the framework of an early theory of morphogenesis. Our finding might account for structure formation in certain biological systems that have gradients in the electric potential and may open new paths for fabricating patterned electrodes.
我们报告了在具有特定类型电流/电极电位（I-phi(DL)）特性的电化学系统中观察到的具有固有波长的稳态、非平衡电位和吸附物模式。这些模式的出现是由于反应动力学中自增强步骤与迁移电流而非扩散的长程抑制之间的相互作用。理论分析表明，在宽且易于获取的参数范围内，具有S形I-phi(DL)特性的所有电化学系统中都会发生这种电极的自结构化。电化学系统中这种不寻常的模式形成不稳定性具有图灵在1952年早期形态发生理论框架中提出的机制的所有特征。我们的发现可能解释了某些在电位上具有梯度的生物系统中的结构形成，并可能为制造图案化电极开辟新途径。
