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. 2024 Jun 1;191(6):361. doi: 10.1007/s00604-024-06427-9

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© The Author(s) 2024

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Fig. 2 — A Current intensity of the anodic peak and B peak-to-peak separation (ΔE) collected from cyclic voltammetry carried out in 5 mM [Fe(CN)₆]^3−/4− in 0.1 M KCl (black) and 5 mM [Ru(NH₃)₆]^2+/3+ in 0.1 M KCl (blue) at 25 mV s⁻¹, using rGO and rGO-nCe sensors obtained with different amounts of Ce³⁺ precursor reported as subscript (mM). GO sensor has been not taken into account since it was not conductive