Preparation And Study On Properties Of Pt-M Alloy Nanocatalyst

In this study,Pt-Cu worm-like nanocatalyst,Pt-Pd core-shell nanocatalyst and Pt-Mn spherical nanocatalyst were prepared by solvothermal method.The effects of reactants,reaction time and reaction temperature on the morphology and structure were investigated.The morphologies and structures of the as-obtained samples were characterized by transmission electron microscopy（TEM）,X-ray diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）,inductively coupled plasma atomic emission spectroscopy（ICP）and fourier transform infrared spectroscopy（FT-IR）.In addition,the electrochemical performance of Pt-M nanocatalysts was investigated by cyclic voltammetry（CV）.Compared with the commercial Pt black,the prepared Pt-M nanocatalysts showed better performance toward methanol and formic acid oxidation.1.One-pot synthesis method has been proposed for preparing Pt-Cu worm-like nanocatalyst.The obtained nanowires were characterized by TEM,XRD,XPS,ICP and FT-IR.According to the experiment results,it could be found that the reaction time,the temperature and the amounts of surfactants could influence the morphology of Pt-Cu nanowires.Moreover,the prepared Pt-Cu alloys and commercial Pt black were used as catalysts to test their electrocatalytic activity by means of CV in a solution containing 0.5M H₂SO₄ and 1 M CH₃OH,and Pt-Cu nanowires exhibited significantly enhanced catalytic activity and stability toward methanol oxidation compared with commercial Pt black.2.A simple method was adopted to fabricate Pt-Pd core-shell nanocatalyst.The morphology and structures of the obtained Pt-Pd nanoparticles were characterized by TEM and HAADF-STEM,the composition and electric structures were determined by XRD,EDS,XPS and ICP.Based on the above results,it could be noticed that Pt-Pd core shell nanostructures with truncated-octahedral morphology were produced,where the core nanoparticles consisted of Pd atoms and the shell layers consisted of Pt atoms.In order to test the catalytic activities of the prepared sample,CV was carried out in 0.5 M H₂SO₄+1 M CH₃OH and 0.5 M H₂SO₄+1 M HCOOH.Compared with commercial Pt black,the Pt-Pd core shell nanostructures with truncated-octahedral morphology exhibited higher activities toward methanol and formic acid oxidation due to the special nanostructures.3.Spherical Pt-Mn nanocatalyst was prepared by solvothermal method.The morphology and structure of Pt-Mn nanocatalyst were characterized by TEM,XRD,XPS and ICP.According to the characterization results,it could be concluded that the Pt-Mn particles with the best morphology could be prepared by changing the reaction time,reaction temperature and the amount of surfactant.The products had a spherical shape,uniform size and good dispersibility.The average diameter was 2.8-4.1 nm.Moreover,the prepared Pt-Mn alloys and commercial Pt black were used as catalysts to test their electrocatalytic activity,and the test results showed that the spherical Pt-Mn nanocatalyst possessed better activity and stability than commercial Pt black.