Fabrication and High Electrocatalytic Activity of Three-Dimensional Porous Nanosheet Pt/Boron-Doped Diamond Hybrid Film

A three-dimensional (3-D) Pt nanosheet perpendicular to boron-doped diamond (BDD) hybrid film surface was prepared by the double template method, with a hydrogen bubble template and subsequent metallic Zn template to control the morphology of the Pt catalyst on the BDD surface. The porous Zn nanostructured template on oxygen-terminated BDD was first synthesized by electrodeposition with a concomitant hydrogen bubble as a dynamic template. Then a porous Pt nanostructure was obtained by immersing the Zn nanostructure in H2PtCl6 aqueous solution for a typical displacement reaction. Field emission scanning electron microscopy (FESEM) revealed that the morphology of the Zn template obtained was a 3-D porous nanosheet structure perpendicular to the BDD thin film surface, and Pt kept the morphology of the Zn template after the displacement reaction. Energy dispersive spectrometry (EDS) and X-ray diffraction (XRD) revealed that the Pt nanosheet obtained was the classical face-centered cubic (fee) pattern. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were performed to evaluate methanol electro-oxidation performance of the 3-D Pt nanosheet/BDD electrode. The results indicated that the electrode had a high electrocatalytic ability resulting from the large surface area and porous structure, which efficiently facilitates the transportation of reactants and products, and an antipoisoning ability due to the support activity of BDD.