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. Author manuscript; available in PMC: 2023 Jun 1.
Published in final edited form as: Langmuir. 2022 Sep 19;38(39):11892–11898. doi: 10.1021/acs.langmuir.2c01385

Figure 2.

Figure 2.

Overlaid cyclic voltammograms showing the voltammetry of hexacyanoferrate(II) (black), cysteine (black dotted), and hexacyanoferrate(II) in the presence of cysteine (red) in 50 mM PB, 0.5 M KCl (pH = 6.4). (a) Bulk, continuous water—cyclic voltammetry of 0.5 mM hexacyanoferrate(II) (black), 5 mM cysteine (black dots), and 0.5 mM hexacyanoferrate(II) and 5 mM cysteine (red). (b) Microliter water droplet—cyclic voltammetry of 0.5 mM hexacyanoferrate(II) (black), 5 mM cysteine (black dots), and 0.5 mM hexacyanoferrate(II) and 5 mM cysteine (red). For all voltammograms in this figure, three electrodes were used: working, reference, and counter electrodes of glassy carbon, Ag/AgCl, and platinum coil, respectively. The scan rate for all experiments is 0.1 V/s, and in line with IUPAC convention, the anodic current is plotted as positive.