Pd nanoparticles supported on 1,10-phenanthroline-5,6-dione modified graphene oxide as superior bifunctional electrocatalyst for highly sensitive sensing

Pd nanoparticles supported on electrochemically reduced graphene oxide (ER-GO) were prepared by an effective electrochemical strategy. Electroactive 1,10-phenanthroline-5,6-dione (phen-dione) was anchorded on the surface of ER-GO by one step potential cycling of GO modified glassy carbon electrode (GCE) in 1,10-phenanthroline (phen) solution from −1 to 1 V (phen-dione/ER-GO/GCE), and Pd2+ was then absorbed on the phen-dione/ER-GO/GCE through coordination interaction followed by electro-reduction to form Pd/phen-dione/ER-GO/GCE. The prepared electrode exhibited excellent electrocatalytic activity towards the oxidation of hydrazine as well as the reduction of hydrogen peroxide (H2O2), which was used to achieve highly sensitive electrochemical sensing of hydrazine and H2O2. In addition, applicability of Pd/phen-dione/ER-GO/GCE for electrochemical detection of hydrazine in real sample was also successfully demonstrated.