Composition-controlled Synthesis of PtCuNPs Shells on Copper Nanowires as Electrocatalysts

摘要

abstract_textpPtCuNPs-shells with adjustable composition on copper nanowires (CuNWs) are synthesized in an organic solvent. Transmission electron microscopy, X-ray diffraction, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy (XPS) measurement techniques are used to analyze the structure and surface composition of the as- prepared PtCuNPs-coated CuNWs (PtCu/CuNWs). The XPS results verify that the incorporation of Cu in the PtCuNPs-shells modified electronic state of Pt, which could further tune the formic acid oxidation (FAO) activity. Electrochemical measurements show that their FAO activities are strongly dependent on the PtCuNPs-shells composition. Our results show that PtCu/CuNWs with atom Pt: Cu ratio of 2: 15 (PtCu/CuNWs-(2: 15)) have the optimal shell composition and show the best FAO performance, with a specific activity of 0.92 mA cm(Pt)(-2) and a mass activity of 0.54 A mg(pt-1) at 0.5 V (vs. RHE), which are 6.6- and 6.0- fold enhancements over those of the commercial Pt/C (0.14 mA cmPt(-2) and 0.09 A mg(pt)(-1)) catalyst./p/abstract_text