Photoelectrocatalytic Reduction Of Carbon Dioxide By Metal Organic Framework With Hexaamino-triphenylene As Ligand

In recent years,the human has realized that the rapid development of the global economy leads to the global warming.Research on CO₂ emissions has become the academic focus on the world.Climate scientists and international organizations such as the United Nations have called for people to cut carbon dioxide emissions,but global carbon dioxide emissions still hit a record high in 2020.In the future,the world may face the depletion of natural resources thus energy production has gradually become a major issue of global concern.However,the photosynthesis of green vegetation is an important revelation from nature,and it is currently the most attractive process that sunlight and electricity are used to convert CO₂ into value-added fuels or chemicals.To achieve that goal,a lot of efforts have been made to develop high efficient heterogeneous homogeneous catalysts,including photosensitive semiconductors,metal complexes,carbonitrides and so on.Metal organic frameworks?MOFs?is a new material,CO₂ reduction in catalytic system can be initiated by ligands or metal nodes.In this paper,MOFs were synthesized,and the morphology and specific surface area were also changed.So the initial concentration of CO₂increased in reaction and conducted catalytic reduction of CO₂ in the reaction tank.The following works were done:First,for hexaamino-triphenylene?HATP?,the spherical morphology with an average diameter of 0.75?m was obtained by three-step synthesis method.And the absorption performance of the ligand in visible light?400⁷00 nm?was demonstrated by UV.Second,Sb and amino have a strong effect of electronic,and the Sb-MOF material with HATP as the ligand is obtained by hydrothermal.The material has a high adsorption performance on CO₂ and the adsorption capacity of CO₂ was 1.24 nmol?cm^-2.Not only does it preserve a good light response of the ligand,but also has a stronger absorption than HATP in visible light.The band gap was 2.53 eV,and the methanol yield was 55.36?mol?L^-1?cm^-2under the photoelectrocatalytic in 6 h.Third,Cu-MOF material with stacked honeycomb structure was synthesized by hydrothermal method.And the catalyst has good electrocatalytic performance when the applied voltage at-0.7 V,and the yield of methanol could reach 59.2?mol?L^-1?cm^-2 in 6 h.