Figure 3

SEM images of lead film electrode surface prepared without (A) and with (B) the use of a zinc mediator. The solution for electrode preparation contained 0.1 mol L−1 acetate buffer pH = 4.6 ± 0.1, 2 × 10−5 mol L−1 Pb(II) and 0 (A) or 1 × 10−5 mol L−1 (B) Zn(II). Zn and Pb were deposited at −1.6 V for 180 s. The potential and time of zinc oxidation and further deposition of lead were −0.95 V and 5 s, respectively. The EDS spectrum of highlighted fragment of the lead film electrode surface prepared with the mediator (C).

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