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. 2020 Mar 20;13(6):1417. doi: 10.3390/ma13061417

Figure 7.

Figure 7

Cyclic voltammetries of the screen-printed electrodes (SPEs) modified with different NiO samples for the detection of a 20 mmol [Fe(CN)6]3−/4− solution in 50 mM phosphate buffer (pH 7.4) with 0.1 M KCl. The samples are indicated by the labels in the figures.