Electrochemical Detection of H₂O₂ on Graphene Nanoribbons/Cobalt Oxide Nanorods-Modified Electrode

Figure 7

The Nyquist plots were recorded using (i) bare GCE, (ii) GNR/GCE, (iii) Co₃O₄ nanorods, and (iv) GNR/Co₃O₄/GCE in 0.1 M KCl with 5 mM [Fe(CN)₆]^3−/4− by applying an AC voltage with 5 mV amplitude in a frequency range from 100 MHz to 100 kHz.