Electrocatalytic Reduction Of Carbon Dioxide With Novel Cu-based Derivatives Catalysts

With the continuous improvement of the degree of industrialization of the country,the burning of non-renewable energy such as fossil fuels continues to consume,producing a large amount of polluting gas.Current conventional CO2 removal technologies to remove CO2 through air carbon capture or biological carbon capture are very limited.Therefore,the processing of carbon dioxide into chemicals with higher added value through catalysts is an important carbon dioxide removal strategy.Common carbon dioxide gas conversion methods include chemical reduction,photocatalytic reduction,electrocatalytic reduction,photoelectric catalytic reduction,piezoelectric catalytic reduction,etc.The development of catalysts with higher catalytic activity,lower catalytic overpotential,higher selectivity and stability has become a research hotspot in recent years.First,the MOF material was modified in this paper.HKUST-1 material with typical octahedral structure was synthesized by hydrothermal method,and gold nanoparticles were successfully loaded into the surface and internal pores of MOF material by impregnation method.The calcined Au@Cu-MOF-265 exposes more metal active sites while still maintaining the typical octahedral structure,which enables it to maintain good catalytic activity.At-1.0 V vs.RHE voltage,the catalyst achieves a Faradaic efficiency of 45% for CH4 generation and maintains good electrocatalytic activity for CO2 reduction within 6 h.Furthermore,we successfully loaded copper-zinc bimetals onto copper foam.By controlling different calcination temperatures,Cu-Zn/CF-400 with unique spherical morphology was successfully synthesized.We found that the introduction of Zn can tune the flocculent Cu metal oxide structure into a Cu-Zn bimetallic spherical structure with higher catalytically active area and more metal active sites.This structure leads to a certain increase in the selectivity of the catalyst to C2 products.When the catalyst was at-1.1V vs.RHE,the Faradaic efficiency of the C2 product reached the maximum value of 46.85%,of which the Faradaic efficiency of C2H4 was 31.25%,and the catalyst could still maintain good electrocatalytic activity within 9 h.