Abstract
The nanocatalysts of Au nanoparticles (NPs) supported on hollow microsphere structured Bi2MoO6 (HMS-BMO) were successfully synthesized by template solvent thermal and in-situ ammonium hydroxide-assisted deposition methods. The hollow microsphere morphology of Bi2MoO6 support contributes to light absorption and possesses high surface area. Supported Au NPs with surface plasmon resonance effect are favorable for enhancing visible light absorption and high-energy electron enrichment. The Au1.5/HMS-BMO catalyst shows the highest conversion efficiency (96.6%) of CO2 and selectivity of CH4 product (94.2%) under visible light irradiation. The apparent quantum efficiency of CH4 formation can reach to 1.71%. Based on the results of in-situ diffuse reflection infrared spectroscopy and density functional theory calculation, the photocatalytic mechanism of Au/HMS-BMO catalyst for CO2 reduction is researched. The possible hydrogenation path of CO2 methanation is proposed: CO2* → COOH* → HCO* → CH3O* → CH4. It provides a novel strategy for designing efficient photocatalysts for CO2 reduction.
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