Full solar spectrum driven plasmonic-assisted efficient photocatalytic CO2 reduction to ethanol

Abstract

Photocatalytic carbon dioxide (CO2) reduction to valuable chemicals (ethanol) is an ideal way to realize artificial photosynthesis. It is still extremely difficult to achieve the challenge for photocatalytic CO2 reduction to multi-electronic products (C2H5OH). Here, we design the SrTiO3 (La Cr)/Cu @ Ni/TiN (STO/Cu @ Ni/TiN) to realize the high efficiency of photocatalytic CO2 reduction conversion into ethanol in the absence of sacrificial reagents. Furthermore, we use non-noble metallic materials such as Cu, Ni, and TiN to enhance the plasmonic effect for efficiently capturing solar full-spectrum energy instead of noble metals. Meanwhile, the TPD results show that Cu@Ni nanoparticles can enhance the chemical adsorption of CO2 molecules. STO/Cu @ Ni/TiN exhibit an optimal ethanol evolution rate of 21.3 μmol/(h·gcat.) and the ethanol selectivity of 79%, which is the highest value for photocatalytic CO2 reduction to ethanol, among the best values of our knowledge. Furthermore, the pathway of ethanol is confirmed by density functional theory (DFT) calculations and the 13C isotope experiment.