Fig. 2
From: Enhancement of Catalytic Activity of Reduced Graphene Oxide Via Transition Metal Doping Strategy
a–f CV (at a scan rate of 50 mV/s) of 0.015 M Cys solutions in PBS at bare GCEs (black lines) and at GCEs modified with 5 wt% a rGO, b Cr-rGO, c Mn-rGO, d Fe-rGO, e Co-rGO, and f Ni-rGO (red lines). g The oxidation currents observed at the bare GCEs are sluggish because of the intrinsically slow oxidation of Cys. h Currents resulting from the electrochemical oxidation of Cys in the presence of pristine rGO and the five TM-rGO catalysts