Preparation Of Tungstate Material And Its Performance On Electrocatalytical Water Oxidation For Producing H₂o₂

As a compound that plays an important role in industrial production and practical applications,hydrogen peroxide（H₂O₂）is currently synthesized mainly through the oxidation process of anthraquinone.However,this method is not only expensive,but also brings a lot of environmental pollution.Relatively speaking,the electrochemical synthesis of H₂O₂ is a more economical and effective method.Catalysts play a decisive role in this process.Due to their rarity,the wide application of precious metal catalysts is limited.The main work of this paper is to explore the tungstate catalyst and its performance optimization for the electrochemical synthesis of H₂O₂by anodic water oxidation.The first chapter mainly introduces the synthesis method of H₂O₂,the reaction mechanism of H₂O₂ electrocatalytic production,the types of catalysts used in H₂O₂production,and the optimization method of the reaction device in the electrocatalytic process.The second chapter mainly introduces the preliminary exploration work of studying the oxidation of two-electron water to produce hydrogen peroxide.That is,tin tungstate（SnWO₄）catalytic materials prepared by hydrothermal synthesis are loaded on different electrode substrates,and the it curve,Faraday efficiency and stability test chart under different conditions are obtained,and the comparison and analysis are carried out to infer different catalyst loadings.The influence of the substrate on the process of two-electron water oxidation to produce hydrogen peroxide,and finally concluded that FTO conductive glass is a better supporting substrate.The third chapter mainly introduces our second part of our work,which is also an in-depth exploration of the excellent catalyst materials for the two-electron water oxidation to produce hydrogen peroxide.That is,calcium tungstate（CaWO₄）,bismuth tungstate（Bi₂WO₆） and a series of Bi₂WO₆@CaWO₄ composite catalyst materials in different ratios are prepared by the same method of hydrothermal synthesis,and then loaded on FTO conductive glass under high temperature conditions Above and using2M potassium bicarbonate as the electrolyte solution,a series of it curves,Faraday efficiency and hydrogen peroxide yield graphs were obtained,and they were comprehensively analyzed with the SEM and TEM characterization graphs of the catalytic material.Experiments show that Bi₂WO₆@CaWO₄（BC=2:1）with a Bi/Ca atomic ratio of 2:1 reaches a current density of 0.52m A·cm^-2 at an overpotential of230m V.Compared with the reversible hydrogen electrode,when the potential is 2.87V,the Faraday efficiency of hydrogen peroxide generated by the oxidation of two electrons of water reaches 64.94%,and the current density attenuation is very small after 36 hours at this potential,so the stability is In other words,it has obvious advantages over previous electrocatalysts.In general,Bi₂WO₆@CaWO₄（BC 2:1）has a good prospect in the field of hydrogen peroxide production through two-electron water oxidation.The fourth chapter is mainly to summarize and sort out our entire research work of tungstate in the oxidation of two-electron water to produce hydrogen peroxide,and on this basis,we will look forward to the future work of this research group in this research direction.