Graphene–Pt nanocomposite for nonenzymatic detection of hydrogen peroxide with enhanced sensitivity

A sensitive hydrogen peroxide (H2O2) sensor was fabricated based on graphene–Pt (GN–Pt) nanocomposite. The GN–Pt was synthesized by photochemical reduction of K2PtCl4 on GNs, and characterized by atomic force microscope (AFM), transmission electron microscope (TEM), and energy-dispersive X-ray spectroscopy (EDS). Electrochemical investigations indicated that the GN–Pt exhibited a high peak current and low overpotential towards the reduction of H2O2. The GN–Pt modified glass carbon electrode displayed a wide linear range (2–710 μM), low limit of detection (0.5 μM) and good selectivity for detection of H2O2 with a much higher sensitivity than that of Pt nanoparticles or graphene modified electrode.

► Graphene-Pt composite with high coverage of Pt nanoparticles is synthesized by a photochemical approach for the first time.
► Graphene-Pt exhibits larger peak current and lower overpotential for H2O2 reduction than Pt nanoparticles.
► Graphene-Pt displays much higher sensitivity and lower detection limit for H2O2 sensing than Pt nanoparticles or graphene.