Two-dimensional MoS nanosheets were in situ grown on TiO nanosheets to form two-dimensional (2D) hybrid nanojunctions, with which MoS nanosheets compactly contact with TiO to increase the interfacial area. MoS was identified as a promising cost-effective substitute for noble metal cocatalysts such as Pt, Au, and Ag, and shows superior activity and selectivity for reducing CO to CHOH in aqueous solution to these metal cocatalysts under UV-vis light irradiation. The photo-luminescence (PL) spectra and transient time-resolved PL decay measurements reveal that the fast electron transfer from TiO to MoS can minimize charge recombination losses to improve the conversion efficiency of photoreduction. It reveals that Mo-terminated edges of MoS nanosheets possess the metallic character and a high d-electron density, and the Mo cation sites may benefit the stabilization of CHO intermediates via electrostatic attraction to enhance the CHOH formation from the reduction of CO in aqueous solution.
Mimicking natural photosynthesis in green plants, an all-solid-state Z-scheme was constructed for photocatalytic reduction of CO2 in the presence of water vapor, consisting of CdS nanospheres (CdS NSs) and TiO2nanoparticles as photocatalysts, and reduced graphene oxide (rGO) as a solid electron mediator. In this Z-scheme system, the photogenerated electrons from conductor band of TiO2 transfer to rGO, and then recombine with existing holes of CdS NSs, allowing that the photogenerated electrons enrich on the CdS semiconductor andholes on TiO2.The photocatalystic efficiency of the Z-scheme system exhibits remarkable enhancement relative to pure CdS, CdS/TiO2, and CdS/rGO.An all-solid-state Z-scheme was constructed for photocatalytic reduction of CO 2 , consisting of Cd Sand TiO 2 as photocatalysts, and reduced graphene oxide (rGO) as a solid electron mediator. The rapid electrontransfer between rGO and photocatalysts contributes to extension of the lifetime of photogenerated electrons,relative to higher photocatalytic CH 4 generation
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