Platinum-nickel bimetallic nanoclusters ensemble-on-polyaniline nanofilm for enhanced electrocatalytic oxidation of dopamine

We report a new approach to design flexible functional material platforms based on electropolymerized polyaniline (PANI) polymer nanofilms modified with bimetallic nanoclusters (NCs) for efficient electro-oxidation of small organic molecules. Composition defined ligand free Pt0.75Ni0.25 NCs were synthesized in gas phase using the Cluster Beam Deposition (CBD) technology and characterized using RTOF, HAADF-STEM, XAFS and XPS. NCs were then directly deposited on PANI coated templates to construct eletrodes. Dopamine (DP) molecule was used as representative organic analyte and the influence of NCs-PANI hybrid’s atomistic structure on the electrochemical and electrocatalytic performance was investigated. As prepared, nearly monodispersed, Pt0.75Ni0.25 NCs of ca. 2 nm diameter featuring a PtOx surface combined with a shallow platelet like Ni-O(OH) phase formed a densely packed active surface on PANI at ultralow metal coverages. Electrochemical measurements (EIS and CV) show a 2.5 times decrease in charge transfer resistance and a remarkable 6-fold increase at lower potential in the mass activity for Pt0.75Ni0.25 NCs in comparison to their pure Pt counterparts. The enhanced electrochemical performance of the Pt0.75Ni0.25 NCs hybrid interface is ascribed to the formation of mixed Pt metal and Ni-O(OH) phases at the surface of the alloyed PtNi cores of the bimetallic NCs under electrochemical conditions combined with an efficient charge conduction pathway between NCs.