(513w) Nano Ag Decorated MoS2 Nanosheets through 1T to 2H Phase Conversion for Photocatalytically Reducing CO2 to Methano

The exfoliated MoS₂ with 2H phase has unique semiconductor properties and was employed for photocatalytic reduction of CO₂ in our work. First of all we synthesized MoS₂ assembled with its nanosheets by hydrothermal method, and used it to fabricate an enlarged lamellar structure with 1T phase of MoS₂ in the presence of lithium ion under sonication, the 1T to 2H phase conversion of MoS₂ was realized by heating in o-dichlorobenzene solution. In order to improve the photocatalytic performance we combined Ag nanoparticles with the as prepared 2H-MoS₂ to form the Schottky knot. The obtained composites were characterized and evaluated for their compositions, morphologies, microstructures and photocatalytic activities in reduction of CO₂ to methanol. We found the electron and hole excited by light on the composites to be more effectively separated through deposited nano Ag and their photocatalytic ability of reducing CO₂ to methanol to be promoted simultaneously. The highest yield of methanol up to 365.08 μmol/g/h appeared at 20wt% Ag on MoS₂. Finally a reasonable photocatalytic reaction mechanism was proposed.