A series of Ag/Ag₂O/BiOCl photocatalysts were prepared by chemically reducing Ag/Ag₂O, and loaded it onto BiOCl with the creation of oxygen vacancies. The composite photocatalysts have greatly improved the CO₂ photoreduction efficiency. Among them, the yields of 4% Ag/Ag₂O loaded BiOCl for CO and CH₄ could reach 30.7 μmol∙g⁻¹∙h⁻¹ and 16.0 μmol∙g⁻¹∙h⁻¹ (under simulated sunlight irradiation), 10.8 μmol∙g⁻¹∙h⁻¹ and 1.8 μmol∙g⁻¹∙h⁻¹ (under visible light irradiation), respectively. These yields are 4.7 and 5.3 times, 6.9 and 5.4 times higher than that of pure BiOCl (CO: 6.6 μmol∙g⁻¹∙h⁻¹, CH₄: 3.0 μmol∙g⁻¹∙h⁻¹ under simulated sunlight irradiation, CO: 1.6 μmol∙g⁻¹∙h⁻¹, CH₄: 0.3 μmol∙g⁻¹∙h⁻¹ under visible light irradiation, respectively). Ag⁰ exhibits the surface plasmon resonance (SPR) effect, thereby enabling efficient absorption of visible light and subsequent generation of high-energy hot electrons. Ag⁰ not only enhances the visible light response of photocatalysts, but the generated hot electrons by Ag⁰ can also actively participate in CO₂ reduction reactions. In addition, the formation of Ag₂O/BiOCl p-n heterojunction can promote the separation of photogenerated carriers while maintaining the overall redox ability of the semiconductor, leading to a significant improvement in photocatalyst efficiency. Furthermore, the Ag/Ag₂O structure is exceptionally self-stable due to mutual electron transport, thereby improving the overall photocatalytic stability of the samples. Density functional theory (DFT) calculations elucidate the formation of the system's ohmic contact and p-n heterojunction. This study provides valuable insights into the significant potential of Ag/Ag₂O/BiOCl composite photocatalysts for CO₂ photocatalytic reduction.

_{通过化学还原Ag/Ag 2} O制备了一系列Ag/Ag ₂ O/BiOCl光催化剂，并将其负载到BiOCl上并产生氧空位。复合光催化剂大大提高了CO ₂光还原效率。其中，负载4% Ag/Ag ₂ O的BiOCl对CO和CH ₄的产率可达30.7 μmol∙g ⁻¹ ∙h ⁻¹和16.0 μmol∙g ⁻¹ ∙h ⁻¹ (在模拟太阳光照射下)， 10.8 μmol∙g ⁻¹ ∙h ⁻¹和 1.8 μmol∙g ⁻¹ ∙h ⁻¹（在可见光照射下）分别。这些产率分别是纯 BiOCl 的 4.7 和 5.3 倍、6.9 和 5.4 倍（在模拟太阳光照射下，CO: 6.6 μmol∙g ⁻¹ ∙h ⁻¹ , CH ₄ : 3.0 μmol∙g ⁻¹ ∙h ⁻¹ ， CO: 1.6 μmol∙g ^-1 ∙h ^-1 , CH ₄ : 0.3 μmol∙g ^-1 ∙h ^-1 (可见光照射下)。Ag ⁰表现出表面等离子体共振（SPR）效应，从而能够有效吸收可见光并随后产生高能热电子。银⁰不仅增强了光催化剂的可见光响应，Ag ⁰产生的热电子也能积极参与CO ₂还原反应。此外，Ag ₂ O/BiOCl pn异质结的形成可以促进光生载流子的分离，同时保持半导体的整体氧化还原能力，从而显着提高光催化剂效率。此外，Ag/Ag ₂O结构由于相互电子传输而具有异常的自稳定性，从而提高了样品的整体光催化稳定性。密度泛函理论 (DFT) 计算阐明了系统欧姆接触和 pn 异质结的形成。_{这项研究为Ag/Ag 2} O/BiOCl复合光催化剂在CO ₂光催化还原方面的巨大潜力提供了有价值的见解。