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4 Polish Journal of Chemistry

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Periodic and Chaotic Current Oscillations During Anodic Dissolution of Cobalt

Dolata M., Kawczyński A. L.

Polish Journal of Chemistry

2008

Vol. 82, nr 10

2031-2037

Simple, multi-periodic and chaotic current oscillations during anodic cobalt dissolution in potentiostatic conditions with rotating disk electrode are described and analyzed.

On the Role of Specific Characteristics of the Streaming Mercury Electrode in the Generation of the Ni=onlinear Electrochemical Dynamical Phenomena

Orlik M., Jurczakowski R.

Polish Journal of Chemistry

2004

Vol. 78 / nr 9

1221-1234

The streaming mercury electrode was recently found by us a very powerful electrode type for the observation of sustained oscillations and multistability accompanying the electrode processes with the region of the negative differential resistance (NDR) in their I-E characteristics. Following our earlier experimental and theoretical studies of the electroreduction of the pseudohalogenide complexes of nickel(II) at the streaming mercury electrode, we discuss the conditions for the onset of oscillations and multistability in these processes, taking into account the dependence of the double layer capacitance on the electrode potential. The improved stability criteria, involving both the differentialCd and integral K capacitances are derived and compared with our earlier simplified theory. Based on the experimental characteristics of the Ni(II)-SCN- electroreduction it is quantitatively shown, how the two factors specific to the streaming electrodes: the permanent flow of the capacitive current and - in particular - the relatively small thickness of the diffusion layer determine the characteristics of the bistable and oscillatory behaviour.

Experimental investigations of chaotic and periodic oscillations during anodic dissolution of copper on rotating disc electrode

Dolata M., Kawczyński A.

Polish Journal of Chemistry

1999

vol. 73 nr 3

519-526

Periodic (up to period 8) and chaotic oscillations observed during anodic dissolution of copper on rotating disc electrode (RDE) in a copper sulphate-sulphuric acid solution under potentiostatic conditions are described and analyzed. Limit cycles and strange attractors are reconstructed. The Poincare' sections and 1D return maps are presented and discussed.

Digital simulation of electrochemical oscillations and associated reagents concentration profiles with the finite differences method

Orlik M.

Polish Journal of Chemistry

1998

Vol. 72, nr 10

2272-2293

A classical differences algorithm of simulation of electrode processes was applied for strict modelling of electrochemical oscillations induced by interplay of ohmic drops and negative polarization resistance of the charge-transfer process. The linear and spherical geometry of diffusion was implemented. A numerical way of incorporating constant and potential-dependent double layer capacitances is described. Examples of shapes of oscillations and associated full diffusion profiles of electroactive species are presented. A comparison of this strict modelling of oscillations and typical approximated way of calculations, suggesting the importance of precise calculations, was outlined.