Strategic harmonization of silica shell stabilization with Pt embedding on AuNPs for efficient artificial photosynthesis
Highly efficient, stable, selective and durable photocatalyst for CO2 reduction system is important to deal with the shortage of energy sources, carbon resources, and resolving the global warming problem. Here, we report Pt-AuNPs@SiO2 mediated efficient photo-conversion of CO2 to HCOOH at room temperature in full-spectrum. Three different morphologies of AuNPs with different SiO2 shell thickness control have been prepared. The silica shell stabilization was achieved with the PtNPs embedding which is an excellent co-catalyst with high selectivity for CO2 reduction. The prepared Pt-AuNPs@SiO2 nanocomplex has shown high efficiency with 1.79% of quantum yield and 3.07% of chemical yield for CO2 photo-conversion in visible light irradiation. The results highlighted the role of SiO2 and then the embedding of Pt nanoparticles which broadened the surface plasmon resonance band of core AuNPs and enhances photoconversion efficiency. Pt-AuNPs@SiO2 demonstrated excellent colloidal, morphological, and photocatalytic stability with 10 reaction recycles and shelf-life of at least six months.