Hydrogen peroxide sensing using ultrathin platinum-coated gold nanoparticles with core@shell structure

► Pt@Au nanoparticles have been developed by UPD redox replacement technique. ► Ultrathin Pt layer greatly enhances the electrocatalytic activity towards the reduction of H2O2. ► Pt@Au nanoparticles show high stability, good selectivity and precision for H2O2 sensing.