Sensing hydrogen peroxide using a glassy carbon electrode modified with in-situ electrodeposited platinum-gold bimetallic nanoclusters on a graphene surface

Platinum-gold nanoclusters (PtAu NCs) were electrodeposited on graphene placed on the surface of a glassy carbon electrode (GCE). The PtAu-graphene nanocomposite was characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and electrochemical methods. The PtAu NCs display excellent electrocatalytic activity towards the reduction of hydrogen peroxide. This effect was exploited in a sensor that responds (at a working voltage of 100 mV) to H₂O₂ in the 15 nM to 8.73 μM concentration range, with a limit of detection at 8.0 nM. (author)