Dual-functional Pt-on-Pd supported on reduced graphene oxide hybrids: Peroxidase-mimic activity and an enhanced electrocatalytic oxidation characteristic

• Pt-on-Pd supported on reduced graphene oxide (Pt-on-Pd/RGO) hybrids was synthesized.
• Pt-on-Pd/RGO had superior catalytic activity in H2O2 reduction and TMB oxidation.
• A sensing approach for H2O2 was developed with a linear range from 0.98 to 130.7 μM.
• Methanol electro-catalytic activity of Pt-on-Pd/RGO was higher than that of Pt black.
• The dual-functional Pt-on-Pd/RGO was first reported.

In this study, a facile hydrothermal method was developed to synthesize Pt-on-Pd supported on reduced graphene oxide (Pt-on-Pd/RGO) hybrids. Because of the synergistic effect between Pt-on-Pd and RGO, the obtained Pt-on-Pd/RGO had superior peroxidase-mimic activities in H2O2 reduction and TMB oxidation. The reaction medium was optimized and a sensing approach for H2O2 was developed with a linear range from 0.98 to 130.7 μM of H2O2. In addition, the characteristic of electrocatalytic oxidation of methanol was investigated. The peak current density value, jf, for the Pt-on-Pd/RGO hybrid (328 mA mg−1Pt) was about 1.85 fold higher than that of commercial Pt black (177 mA mg−1Pt) and, also, more durable electrocatalytic activity could be obtained. For the first time, the dual-functional Pt-on-Pd/RGO with peroxidase-mimic activity and an enhanced electrocatalytic oxidation characteristic was reported.

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