Accelerating fronts during the electrodissolution of cobalt

Negative coupling during oscillatory pattern formation on a ring electrode

“…In the bistable region transitions from one state to another, such as from passive to active, can be associated with accelerating reaction fronts. 3,4 In the oscillatory region periodic and chaotic oscillations are often accompanied by spatial patterns that vary with time; [5][6][7][8][9][10][11][12][13][14] rotating waves have also been observed 15,16 in the oscillatory region. Lev et al 17 during the electrodissolution of nickel ribbon electrodes obtained modulated oscillations under galvanostatic and under potentiostatic conditions with an external resistor.…”

“…This coupling has been shown to cause the front acceleration that was mentioned above. 3,4,21 In addition, however, a global coupling can be imposed on electrochemical systems simply through the addition of an external resistance. When an overall potential is imposed on a system ͑potentiostatic operation͒, potential drops through the resistance influence the potential of the working electrode ͑reacting surface͒: Thus, this coupling is global.…”

Experimental and Model Spatiotemporal and Spatial Patterns in Electrochemical Systems

“…Other experimental examples of the electrochemical accelerated fronts include the dissolution of Co [25,26] and Fe [11,12] (see Sect. 2.1) electrodes.…”

Evolution of spatiotemporal patterns during the electrodissolution of metals: Experiments and simulations

“…Visible accelerating fronts occur during the passive-active transition in both bistable and oscillatory conditions on ribbon cobalt electrodes in buffered phosphoric acid electrolytes. 23 A position-time plot concave upward depicted in Fig. 3 represents an accelerating front in the bistable system.…”