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. 2023 Sep 28;28(19):6845. doi: 10.3390/molecules28196845

Figure 3.

Figure 3

Stabilized cyclic voltammograms of a SiO2-modified electrode immersed in different concentrations of ferrocenium. Scan rate: 100 mV s−1. (A) A 0.06 mM solid line; 0.09 mM dashed line; 0.12 mM dotted line. (B) A 0.12 mM solid line; 0.15 mM dashed line. (C) A 0.18 mM solid line; 0.27 mM dashed line; and 0.36 mM dotted line. (D) Cathodic peak current vs. Fc+ concentration plot of the ITO electrode (blue circles), ITO/SiO2 electrode (red squares), and the theoretical values calculated using the Randles–Sevcik equation (black triangles).