Figure 2. a) Cyclic voltammograms at GCE in 0.1 M HEPES buffer pH 7.4 for 2.2 mM of TPFPP(PEG)4 (black), MnIII-3 (red) and ZnII-3 (blue); b) Plot of the peak current versus square root of scan rate for the peaks IIIa/IIIc, corresponding to MnII/MnIII for the CV of 2.2 mM MnIII-3 in 0.1 M HEPES buffer pH 7.4 at scan rates 10-100 mV s-1
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