One-Step Synthesis of Au@Pt-Graphene Nanocomposites and Their Electrochemical Properties.

A nanocomposite of gold@platinum core-shell nanoparticles on reduced graphene oxide (Au@Ptgraphene) was synthesized by a one-step method and further fabricated into a nanohybrid electrode. This approach not only allows for better structural integration of different components on the electrode but also improves the electrochemical properties in terms of the electrocatalytic activity and capacitive performance. As employed in the electrochemical sensor, the Au@Pt-graphene-modified glassy carbon electrode (GCE) has a wide linear range from 0.5 μmol·L to 22.3 mmol·L, a detection limit of 0.2 μmol·L, high selectivity, good reproducibility and long-term stability towards the nonenzymatic detection of hydrogen peroxide (H₂O₂). Furthermore, when used as a binder-free electrode in supercapacitors, this electrode exhibits a high specific capacitance of 345 F·g at a current density of 1 A·g, and the specific capacitance retention remains at 96% after 1000 times cycles. These merits enable a versatile electrode material for electrochemical applications.