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Impedance spectra at 0.7 V (vs. Ag pseudo-reference electrode) for the particular modifications of the screen-printed electrodes: SPCE—black curve, SPCE/MWCNT—red curve, SPCE/MWCNT/NiO0.3—blue curve, SPCE/MWCNT/NiO1—pink curve, SPCE/MWCNT/NiO1.5—green curve.
