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Consideration about a voltammogram as the bifurcation diagram of oscillating electrochemical systems: a case study of the copper|1 M trifluoroacetic acid oscillator

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Abstract

The anodic dissolution of copper electrode in 1 M trifluoroacetic acid (TFA) was investigated by applying linear sweep and cyclic voltammetry. The current–potential (I–E) polarization curves (voltammograms) were interpreted from the perspective of non-linear dynamics. The obtained results showed that the voltammogram can be divided into three separate regions. As the system was moved away from the thermodynamical equilibrium, the first to appear is the region of stable steady-state (marked as SSS1 region). This region was followed by the region of oscillatory states (the OsS region). The SSS1 → OsS transition is characterized by bifurcation potential, E BIF1 = 0.558 VSCE. The third region, the region of stable steady-state (marked as the SSS2 region) occurs after the OsS → SSS2 transition, and is characterized by the potential bifurcation, E BIF2 = 0.657 VSCE. The cyclic voltammetry measurement has revealed the lack of hysteresis at the SSS1 ↔ OsS transition, and its existence at the OsS ↔ SSS2 transition (the hysteresis width was 34 mV). The results of this study are presented to demonstrate that the voltammograms of the Cu|1 M TFA oscillating electrochemical system can be considered as a bifurcation diagram, experimentally constructed under dynamical conditions.

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Acknowledgements

This work was supported by the Ministry of Education, Science and Technological Development of Republic of Serbia, throughout Projects No. 172015. Author would also like to express its deepest gratitude to the Professor Dr. Ljiljana Kolar-Anić for her wise guidance throughout wonderful world of the oscillatory phenomena.

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  1. Chemical Dynamics Laboratory, Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001, Belgrade, Serbia

    Nebojša I. Potkonjak

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  1. Nebojša I. Potkonjak
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Correspondence to Nebojša I. Potkonjak.

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Potkonjak, N.I. Consideration about a voltammogram as the bifurcation diagram of oscillating electrochemical systems: a case study of the copper|1 M trifluoroacetic acid oscillator. Reac Kinet Mech Cat 123, 155–163 (2018). https://doi.org/10.1007/s11144-017-1325-5

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  • DOI: https://doi.org/10.1007/s11144-017-1325-5

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