Derivative Preparation And Photocatalytic Properties Of Graphene Grown Nickel-based Nanosheet Composites

With the increasing urgency of the world's demand for green and sustainable energy,obtaining hydrogen energy,especially by photolysis of water,has become one of the most important research directions of people.Its core is to seek breakthroughs in photocatalytic materials.Among them,cheap transition metals or these metal oxidation state materials are one of the research hotspots.Compared with conventional nanoparticle catalysts,considering the adverse effects of their limited light-receiving surface and charge transfer cross-section caused by particle discontinuity,this paper proposes Design and preparation of nanosheet-type nickel-based catalysts for photocatalytic hydrogen production performance,the specific results are as follows:(1)The preparation of the target sample was attempted by the redox synthesis method,which was characterized by powder X-ray diffraction(XRD),transmission electron microscopy(TEM)and X-ray photoelectron spectroscopy(XPS),etc.,to verify that the synthesized sample was Ni(OH)2 nanosheet material,under 90 ml water,10 ml triethanolamine,20 mg eosin,20 mg catalyst,hydrogen production of 1.8 mmol g-1 h-1 can be achieved under visible light irradiation at normal temperature and pressure.Add 300?L of nitrobenzene under the same conditions of hydrogen production to reduce the nitrobenzene with the hydrogen produced in situ by photocatalysis,and the conversion rate can reach 98%;and roast it into NiO-Ni(OH)2 compound After the nanomaterials,the hydrogen production has increased.The analysis of impedance(EIS)shows that the interface charge transfer impedance of the Ni(OH)2 nanosheet material is higher than that of the composite material,which shows that further reduction of the interface impedance is to increase the nickel base.The key aspect of the electrocatalytic performance of the nanosheet material,for this purpose,a subsequent study on the introduction of graphene oxide sheet materials to construct nickel-graphene composite materials was carried out.(2)In the synthesis system,the graphene oxide sheet material is introduced,and the nickel-based nanosheets are attempted on it.The comprehensive characterization analysis shows that nickel-based nanosheets can be obtained when the nickel loading is between 2.0-12.0 wt.%-Graphene composite nanosheet material;photocatalytic tests show that,after the introduction of graphene,compared with a single nickel-based nanosheet material,the interface charge transfer impedance can be significantly reduced,and the lower the load,the more significant the impedance reduction,while photocatalysis The hydrogen production performance and photo-induced hydrogen production in situ hydrogenation performance can be improved by 35.4 times and 48.5 hours to 98.5%conversion rate,these results show that by constructing nano-sheet nickel-graphene composite materials,it is expected to get excellent performance and cheap Practical photocatalyst for water production and hydrogen production.