Fig. 4
From: Enhancement of Catalytic Activity of Reduced Graphene Oxide Via Transition Metal Doping Strategy
CV results at a scan rate of 50 mV/s for 0.015 M Cys solutions in PBS at GCEs modified with 5 wt% a Cr-rGO, b Fe-rGO, and c Co-rGO. HRPES S 2p core-level spectra of the products of the photocatalytic oxidations of Cys (after 180 L exposure) carried out in the presence (red lines: TM3+ and blue lines: TM2+) of 5 wt % d Cr-rGO, e Fe-rGO, and f Co-rGO. g Values of the S3-to-S1 ratio after 180 L Cys exposure. h Catalytic currents resulting from the electrochemical oxidations of Cys in the presence of the various types of pristine rGO and the three TM-rGO (red lines: TM3+ and blue lines: TM2+)