Construction Of Novel Cu-based Nanomaterials For Catalysis

Excessive exploitation and consumption of fossil fuels has created a series of energy crisis and environmental problems.Developing clean and sustainable new energy and actively taking measures to deal with environmental pollution are effective measures to solve the above problems.Hydrogen as new green energy,hydrogen production by electrochemical water splitting has been widely concerned because of its simple operation,normal temperature and pressure and high purity of the product.In addition,photocatalytic technology as a promising way is also widely used in dealing with environmental problems.Nanomaterials have been widely studied in catalytic fields,copper-based nanomaterials have attracted the interests of researchers due to their abundant reserves,low price,good electrical conductivity and special physical and chemical properties as 3d transition metals.In this paper,the ternary alloy,amorphous alloy and metal-supported TiO₂catalyst were successfully prepared by the addition of copper as cheap transition metal,and they were applied to water splitting and the photocatalytic treatment of pollutants in the water.The following parts are our main research contents of this paper:(1)Construction of mesoporous PtRhCu nanoalloy for electrocatalytic hydrogen evolution reactionThe mesoporous PtRhCu nanoalloy was prepared by soft template method.The composition and size of the material were changed by adjusting the ratio of metal precursor solution,and then the structure-activity relationship between the catalyst and the hydrogen evolution reaction performance was obtained.Due to the synergistic enhancement effect of the alloy and mesoporous structure,compared with the commercial Pt/C,the HER activity of ternary PtRhCu nanoalloy has been significantly improved and shows high stability.(2)Preparation of a novel CuCoB amorphous alloy for electrocatalytic oxygen evolution reactionA new kind of CuCoB amorphous alloy with novel porous chain morphology was synthesized by surfactant self-assembly method and we investigated the catalytic performance of water splitting for oxygen evolution.The addition of Cu can not only reduce the agglomeration phenomenon,control the ordered morphology of amorphous alloys,but also increase the electrical conducticity of the catalysts and further promote their catalytic activity of OER.In addition,the amorphous alloys have a large number of suspended chemical bonds and abundant low coordination atoms,which are beneficial to the absorption and activation of the catalyst on water molecules,and the combined chain-like structure is conducive to the electron transfer,so the chain-like CuCoB amorphous alloy has the best catalytic activity.(3)Construction of novel PdCu-TiO₂for photocatalytic Nitrate Removal PerformanceWe used microwave assisted synthesis and photodeposition to prepare for the PdCu-TiO₂,which was used in the photocatalytic removal of nitrate.By combining bimetallic Pd andCu with semiconductor material TiO₂,the composite of photogenerated electrons and holes can be effectively reduced.At the same time,the hole oxidation formic acid is used to generate CO₂^·-,and the water pollutant nitrate is converted into cleaning product N₂in collaboration with photogenerated electrons,achieving effective closed loop of pollutants.