Electrocatalytic Reduction Of Carbon Dioxide By Novel Copper-based Composite Catalyst

With the continuous advancement of society and technology,non-renewable energy sources such as petroleum are consumed in large quantities.This is followed by more and more serious environmental problems such as the greenhouse effect.Carbon dioxide is the culprit leading to the greenhouse effect,but the current capture and storage of carbon dioxide The method has many drawbacks,and the conversion of carbon dioxide into value-added products and chemicals is a promising method.Carbon dioxide is considered by scientists as the main carbon raw material in the future.Common ways to convert carbon dioxide gas such as chemical reduction and photocatalytic reduction,Biotechnology conversion and electrocatalytic reduction,etc.Among them,the reaction conditions of electrocatalytic reduction technology are mild and simple,and the reaction does not need to provide additional substances,saving energy.These unique advantages make the electrocatalytic reduction of carbon dioxide from many methods.To stand out among the transformation methods has become the focus of many researchers.In this paper,by controlling the amount of additive tannic acid added to the electrodeposition solution,four catalysts with different morphologies were prepared by a simple galvanostatic electrodeposition method.Among them,the unique morphology and structure of Cu-P-100 make it have more Catalytic reduction of carbon dioxide active sites and electron transfer ability.When the potential is-0.9 V vs.RHE,the Faraday efficiency of electrocatalytic reduction of carbon dioxide to acetic acid in a 0.1 M KHCO₃ solution can reach 33.4%.The addition of tannic acid significantly enhances the ability of the catalyst to electrocatalyze the reduction of carbon dioxide,at-1.0 At the potential of V vs.RHE,the partial current density of Cu-P-100 to reduce carbon dioxide is 6 times that of Cu-P-0 deposited without tannin.HKUST-1 is a widely used MOF material.Its unique octahedral structure and metal organic framework make it applicable to various catalytic reactions,but its easy decomposition in the water phase limits its application in electrocatalysis.In this thesis,Pd nanoparticles are doped in HKUST-1 and calcined at 260℃to obtain Pb@Cu-260,a catalyst that can be used for electrocatalytic reduction of carbon dioxide.The results show that the synergistic effect of Pd nanoparticles and MOF framework makes Pd nanoparticles The addition of Pd greatly improves the selectivity of CH₄.Under the potential of-0.9 V vs.RHE,the Faraday efficiency of CH₄ generation can reach 43.8%,which is about 5 times that of no Pd nanoparticles.