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<p>The effect of chloride ion on the dynamical behavior of nickel electrodissolution in an aqueous sulfuric acid solution was studied by means of cyclic voltammetry and potentiostatic experiments. Experiments were conducted with and without an external resistor. In the absence of the externally added resistance, only bistable behavior was observed both without chloride and with the presence of 10&#xa0;mM and 30&#xa0;mM chloride in the electrolyte. With the addition of the external resistor, both bistability and oscillations were seen. In the absence of chloride, the current oscillations under potentiostatic conditions near the Hopf bifurcation point was periodic. With 10&#xa0;mM and 30&#xa0;mM chloride in the electrolyte, low-dimensional chaotic current oscillations were observed. At the highest concentration studied (500&#xa0;mM), the nickel electrode did not passivate. The system displayed irregular oscillations of current at this concentration. The nickel-sulfuric acid system exhibits more complex oscillations of current under potentiostatic conditions when chloride ions are present.</p> Graphical abstract <p></p>

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Current oscillations during electrodissolution of nickel in a sulfuric acid solution containing chloride ions

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Levent Organ

摘要

The effect of chloride ion on the dynamical behavior of nickel electrodissolution in an aqueous sulfuric acid solution was studied by means of cyclic voltammetry and potentiostatic experiments. Experiments were conducted with and without an external resistor. In the absence of the externally added resistance, only bistable behavior was observed both without chloride and with the presence of 10 mM and 30 mM chloride in the electrolyte. With the addition of the external resistor, both bistability and oscillations were seen. In the absence of chloride, the current oscillations under potentiostatic conditions near the Hopf bifurcation point was periodic. With 10 mM and 30 mM chloride in the electrolyte, low-dimensional chaotic current oscillations were observed. At the highest concentration studied (500 mM), the nickel electrode did not passivate. The system displayed irregular oscillations of current at this concentration. The nickel-sulfuric acid system exhibits more complex oscillations of current under potentiostatic conditions when chloride ions are present.

Graphical abstract