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The rational design of transition‐metal sulfide with two‐dimensional (2D) structure and tunable edges on the nanoscale can effectively improve their activity for variously catalytic reactions. Herein, the 2D PbS nanosheets with abundant zigzag edges (e‐PbS NS), which exhibited an excellent performance for CO2 photoconversion to CO, were constructed. The zigzag edges on the PbS NS are beneficial for exposing more active sites and promoting charge separation, thereby accelerating the kinetics process of CO2 photoreduction. This study provides a strategy to regulate structure with effective edge sites for the CO2 reduction. [ABSTRACT FROM AUTHOR]

Abstract: Photocatalytic CO2 reduction is an attractive approach for the direct conversion of solar energy into chemical fuels. In this study, we synthesized a composite material that consists of Ag, reduced graphene oxide (RGO), and CdS nanorods as a photocatalyst for CO2 reduction. The morphological, structural, optical, and electrochemical properties of the resultant nanocomposite (Ag‐RGO‐CdS) were investigated by using various physical techniques (e.g., XRD, SEM, TEM, X‐ray photoelectron spectroscopy, UV/Vis diffuse reflectance spectroscopy, and electrochemical impedance spectroscopy). Our results indicate that the Ag‐RGO‐CdS nanocomposites exhibit an enhanced photocatalytic activity for the conversion of CO2 into CO, and the optimum activity is achieved over 1.0 wt %Ag‐3.0 wt %RGO‐CdS. This enhanced performance can be ascribed to the multifunctional promoting effects of RGO and Ag in the composite. On one hand, RGO and Ag can act as electron acceptors, which enhances the separation efficiency of photogenerated carriers. On the other hand, the incorporation of RGO and Ag can improve the adsorption and activation of CO2, which results in the enhancement of the photocatalytic reduction of CO2 to CO. Furthermore, a possible mechanism for photocatalytic CO2 reduction over the Ag‐RGO‐CdS nanocomposites was proposed. This study demonstrates a semiconductor‐based hybrid for efficient photocatalytic CO2 reduction by virtue of the combinational effect of dual cocatalysts. [ABSTRACT FROM AUTHOR]