Preparation Of Copper/copper Oxide-based Catalysts And Electrocatalytic Of CO₂

Developed carbon dioxide conversion technology to turn waste products into energy treasures.The electrocatalytic reduction of CO₂ reaction（CO₂RR）driven by renewable electricity to convert the greenhouse gas（CO₂）into chemical fuels with added value is of great significance.The synthesis of high-performance and robust catalysts was a key issue in CO₂RR.In order to solve the problems of low current density and narrow active potential range,the bimetallic tin-copper nanorods and copper oxide cubic catalyst doped with indium oxide were designed using the metal Cu as the main raw material.The main conclusions are as follows:Sn precursors were prepared by hydrothermal synthesis,and bimetallic tin-copper（Sn-Cu）nanorods were prepared by ion exchange method.The catalytic performance of the catalyst in the electrocatalytic reduction of CO₂ is studied.The catalyst has high selectivity to C₁ products（such as CO and HCOOH）,and complets carbon conversion in CO₂molecules.When the electrode potential was-0.8 V（vs.reversible hydrogen electrode RHE）,the Faraday efficiency of C₁ product has higher value,and the product HCOOH reached 70%,and the product CO was 20%.The rod-shaped nanostructures increased the electrochemically active area of the catalyst and provide a charge transfer path,thus promoted the conversion process of CO₂ molecules.Cubic Cu₂O precursor was prepared by solvothermal method,and In₂O₃ doped Cu O catalyst（In₂O₃/Cu O）with Cubic porous structure was obtained by precipitation method,and its catalytic performance in electrocatalytic reduction of CO₂ reaction was studied.When the electrode potential was-0.7 V（vs.RHE）,the Faraday efficiency of the product CO has high value（about 89%）,and also the active current density was high（10 m A/cm²）.During the reaction,the highest active current density reached 14.7 m A/cm².In the potential range of-0.6 V～-0.8 V（vs.RHE）,the Faraday efficiency of the product CO was more than 80%,and the active current density was more than 8 m A/cm².The porous structure of the catalyst provided a good mass transfer channel and electronic transport path for the electrocatalytic reduction of CO₂,and realized the efficient conversion.To sum up,the bimetallic Sn-Cu nanorod catalyst and In₂O₃ doped Cu O cubic porous structure catalyst prepared in this paper were characterized and tested.These two catalysts have high current density,high product selectivity and good catalytic performance in a wide potential range,which were of great significance for the study of electrocatalytic reduction of CO₂.