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The plot of log of peak current vs. scan rate for (a) SPE/LPE/ZnO NPs, (b) SPE/GPE/ZnO NPs, and (c) SPE/OPE/ZnO NPs and log of peak current vs. log of scan rate for (d) SPE/LPE/ZnO NPs, (e) SPE/GPE/ZnO NPs, and (f), SPE/OPE/ZnO NPs in 10 mM K3[Fe(CN)6] in 0.1 M KCl at pH ≈ 7.
