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.

中文翻译：

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银纳米粒子修饰的还原氧化石墨烯-硫化镉纳米棒，可在可见光下有效地光催化还原二氧化碳

光催化还原CO ₂是将太阳能直接转化为化学燃料的一种有吸引力的方法。在这项研究中，我们合成了一种复合材料，该复合材料由Ag，还原的氧化石墨烯（RGO）和CdS纳米棒作为光催化剂来还原CO ₂。通过各种物理技术（例如XRD，SEM，TEM，X射线光电子能谱，UV / Vis漫反射光谱，和电化学阻抗谱）。我们的结果表明，Ag-RGO-CdS纳米复合材料对CO ₂的转化具有增强的光催化活性。进入一氧化碳，并在1.0 wt％Ag-3.0 wt％RGO-CdS上获得最佳活性。这种增强的性能可归因于RGO和Ag在复合材料中的多功能促进作用。一方面，RGO和Ag可以充当电子受体，从而提高了光生载流子的分离效率。在另一方面，RGO和Ag的掺入可以提高CO的吸附和活化₂，这导致光催化还原的CO的提高₂至CO。此外，用于光催化CO的可能机制₂还原比Ag的提出了RGO-CdS纳米复合材料。这项研究证明了基于半导体的杂化剂可以有效地催化CO ₂ 由于双重助催化剂的联合作用而减少了碳。