Synthesis Of Cu-based Catalysts For Electrochemical Reduction Of CO₂

Electrochemical reduction of CO₂ can convert CO₂ to CO,formic acid,alcohols,and varieties of hydrocarbons in aqueous solution with the competitive reaction of hydrogen evolution reaction.Compared with other reduction method,CO₂ electrochemical reduction reaction can occur at normal temperature and pressure without hydrogen addition,which accords with the concept of environmental protection,and sustainable development.However,CO₂ molecule is thermodynamically stable,so it needs electrocatalysts to reduce the activation energy.Therefore the study on catalysts with efficient catalytic activity becomes important.Among those known catalysts,Cu shows unique performance that can convert CO₂ into many hydrocarbons with high economic value such as ethylene.However,its poor selectivity and high overpotential as well as its synthetic method still need to be improved.Based on these problems above,this paper is mainly focus on the synthesis method of Cu nanoparticles and Cu-Au bimetallic nanoparticles,and the study on liquid phase reduction system at low temperature in H-type electrolyte.The details are as follows:?1?Use Zinc porphyrin as photosensitizer and reductant to synthesize Cu nanoparticles in aqueous solution under light irradiation for electrochemical reduction of CO₂.It is a novel method to prepare metal nanomaterials and first used to prepare Cu.Compared with other Cu nanoparticles synthesized in aqueous solution,the size of photocatalytic synthesized Cu is smaller than 100 nm and shows electrochemical performance for CO₂ reduction.?2?Use oleylamine as solvent to synthesize Cu-Au nanoparticles with different morphologies and Cu/Au atomic ratio.Adding Au to adjust the morphology,oxidation resistance,and the selectivity of catalysts.?3?Use H-type electrolyzer as the reactor and gas chromatography to analyze gas products online.