Synthesis Of Platinum-containing Nanowires And Their Performance In Electrochemical

Platinum-containing nanowires can be divided into platinum-based nanowires and platinum-doped nanowires according to the content of platinum.Due to their unique electronic structure,they have attracted a lot of attention from researchers in the fields of catalysis and detection.Especially in the electrocatalytic hydrogen evolution reaction,platinum has the best hydrogen binding ability and exhibits the lowest onset overpotential of the hydrogen evolution reaction under acidic conditions,and is considered to be the most promising candidate for the future practical electrocatalytic development,However,as a noble metal,platinum is still an important research direction because of its expensive use cost,limited catalytic performance and irreplaceability.In this paper,platinum-copper nanowires and Pb Te nanowires loaded with platinum on the surface were selected as the research objects,and porous spike-shaped platinum-copper nanowires（p-ST-Pt Cu）were successfully synthesized.The impact of chemical hydrogen production and the results were analyzed;on the basis of the reported literature,the synthesis conditions of lead telluride nanowires were preliminarily explored,and a series of noble metal supported lead telluride nanowires were successfully prepared.Its electrocatalytic hydrogen evolution reaction（HER）has been explored,and the specific research is as follows:1.Using platinum acetylacetonate and copper chloride dihydrate as raw materials,under the condition of oil bath,platinum-copper nanowires with uniform size and spike-like helical structure were obtained by two-step in situ growth,with a length of 300±50nm.,with a diameter of 20±5 nm,and further acid etching treatment obtained porous spike-like platinum-copper nanowires.The platinum-copper nanowires before and after etching were characterized by spherical aberration electron microscope,XPS and EPR.Large surface strain and surface oxidation and lone pair electrons brought about by etching.Afterwards,the obtained two kinds of platinum-copper nanowires before and after etching were tested for electrocatalytic hydrogen production by water splitting,and compared with commercial platinum-carbon under the same conditions,phs-Pt Cu NWs can provide excellent performance.At a potential of 400 m V,it can provide 185.01 m Acm^-2,which is2.57 times that of untreated hs-Pt Cu NWs at the same overpotential(87.12 m Acm^-2@400m V).In order to explore the reason,HER theoretical calculations were carried out,confirmed the influence of the strain generated by etching treatment on catalysis,and this study provides some support for the construction of better HER catalysts.2.Using potassium tellurite and lead chloride as raw materials,on the basis of the reported literature,successfully synthesized lead telluride ultra-long nanowires with uniform size and good dispersion with a length of 1.5±0.2μm by hydrothermal method,in the initial stage of material synthesis exploration,with the help of low-magnification transmission electron microscopy,the influence of a series of conditions on the morphology,such as reaction time,temperature,surfactant PVP addition,and storage conditions,etc.,was successfully synthesized after the successful synthesis of lead telluride nanoparticles.On the basis of the line,using the characteristics of tellurium atoms in the surfactant CTAB solution,a relatively mild and simple noble metal loading strategy was designed,and a series of common metals（platinum,silver,copper,cerium,etc.）were successfully loaded..In the end,the platinum-silver bimetallic lead telluride nanowires will be successfully supported.After high-concentration acid etching treatment to remove impurities,and electrocatalyzed water splitting under acidic conditions to produce hydrogen,the test results show that the platinum-silver bimetallic loading after etching Lead telluride nanowires are an excellent HER catalyst,providing a current density of 400 m Acm^-2 requires only 250m V overpotential,while the untreated catalyst requires 548 m V overpotential,which shows that etching greatly optimizes the catalyst Performance of acidic HER.This finding provides a certain reference for the application of noble metal supported materials,especially lead telluride materials,in the field of electrocatalysis.