Catalyst Design And Synthesis Of Photothermal Synergistic Catalytic CO₂ Reduction To Fuel

From the perspective of alloy materials and ionic liquids favoring CO₂ adsorption and activation,AuCu/g-C₃N₄ and CuO/g-C₃N₄ composite catalysts were constructed.The morphology,structure,optical properties and chemical composition of the catalyst were analyzed through a series of characterizations,and the process of efficiently photothermally catalyzed reduction of CO₂ was systematically studiedAuCu/g-C₃N₄ was prepared by seed-mediated method,thermal polycondensation and hydrothermal.AuCu alloy provideds active sites for CO₂ adsorption and activation The positive charge on Au surface facilitates the adsorption of CO₂ molecules on the alloy surface.The charge transfers from Au to Cu enriches Cu with excessive negative charges.At the same time,the strong interaction between the alloy and g-C₃N₄ under light accelerates the migration of g-C₃N₄ photogenerated charges to the alloy,making Cu negative.The charge is further accumulated.The negative charge accumulate on Cu is conducive to the activation of CO₂ into*CO intermediates,and C-C coupling on the surface of the alloy,and then converte to ethanol.Under visible light irradiation at 120?,the 1.0 wt.%AuCu/g-C₃N₄ composite catalyst uses water as the solvent,and the yield and selectivity of ethanol are 0.89 mmol·g^-1·h^-1 and 93.1%,which are 4.2 times that of photocatalysis,7.6 times that of thermal catalysis,showing a high photothermal synergy and significantly inhibiting H2 evolution.CuO/g-C₃N₄ heterojunction catalyst was constructed by hydrothermal method.Amine-functionalized ionic liquid 1-aminopropy-3-methylimidazole bromide can increase the solubility of CO₂ and reduce the overpotential.The interaction between CuO and g-C₃N₄ significantly enhanced the charge transport and separation capabilities.Under visible light irradiation at 100?,the yield of 3.0 wt.%CuO/g-C₃N₄ for reducing CO₂ to ethanol in an aqueous solution containing a small amount of ionic liquid was 1.16 mmol·g^-1·h^-1,which was 1.8 times that of photocatalysis,7.1 times that of ethanol,the selectivity to ethanol is 100%.Figure 45;Table 4;Reference 93...