Controlling C2+ Products Selectivity of Electrochemical CO2 Reduction on Electrosparyed Cu Catalyst
Cu catalysts prepared by modifying bulk Cu foils have achieved high performance for value-added C2+ componds from electrochemical CO2 reduction (CO2RR), but active sites transformation can be affected by the bulk substrate which make it complex to design catalyst. Here, we newly introduce a simple electrospray pyrolysis synthesis to take advantage of facile wet-chemical synthesis applicable on non-copper substrate such as porous carbon paper, and demonstrate highly enhanced selectivity for ethylene production from CO2RR. The improved performance is proposed to be related with having Cu mixed state and keeping the morphology of the electrosprayed catalyst on the carbon paper showing the importance of the substrate. In addition, the C2 production selectivity can be tuned by the electrospray synthesis time as affecting the size of the surface nanostructure as well as the prososity of the catalyst, which can provide an effective way regulate the C2/C1 ratio. Product analysis of a series of the electrosprayed Cu catalysts showed that the production of oxygenated chemicals such as formate or ethanol are associated with hydrogen production.