Efficient conversion of carbon dioxide (CO₂) into energy‐bearing compounds using abundant solar energy is a promising technique that simultaneously responds to the concerns on global warming and energy shortage. The purpose of this study was to find a photocatalyst that can efficiently utilize sunlight for an efficient reduction of CO₂ to energy‐bearing carbon monoxide (CO). Silver phosphate/titanium dioxide (Ag₃PO₄/TiO₂) hetero‐structured photocatalysts with different mole ratios of Ag₃PO₄ to TiO₂ were synthesized by a facile precipitation method, and for the first time used for photocatalytic CO₂ reduction by water vapor (H₂O). When the mole ratio of Ag3PO4 to TiO₂ was 0.15, the as‐synthesized photocatalyst exhibited the highest CO₂ reduction activity under ultraviolet (UV) and visible light irradiation, with the productivity of CO reaching as high as 74.84 μmol·g⁻¹ within a 3‐h experiment. This is 3.5 and 11.7 times higher than that for the bare Ag₃PO₄ and TiO₂, respectively. The characterization results indicate that a heterojunction was formed between Ag₃PO₄ and TiO₂, which significantly promoted the photocatalytic CO₂ reduction reactions through facilitating the separation and migration of the photogenerated charge carriers. This study verified that the Ag₃PO₄/TiO₂ catalyst can effectively utilize solar energy for reduction of CO₂ to CO.

中文翻译：

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Ag3PO4 / TiO2光催化剂在紫外和可见光照射下将CO2有效还原为CO

利用丰富的太阳能将二氧化碳（CO ₂）有效地转化为含能化合物是一项很有前途的技术，可同时应对全球变暖和能源短缺的担忧。这项研究的目的是找到一种可以有效利用阳光来将CO ₂有效还原为载能一氧化碳（CO）的光催化剂。通过简便的沉淀法合成了Ag ₃ PO ₄与TiO ₂摩尔比不同的磷酸银/二氧化钛（Ag ₃ PO ₄ / TiO ₂）异质结构光催化剂，首次用于光催化CO ₂通过水蒸气（H ₂ O）还原。当Ag3PO4与TiO ₂的摩尔比为0.15时，合成的光催化剂在紫外光和可见光照射下表现出最高的CO ₂还原活性，CO的产率在74.84μmol·g ^-1以内。 3小时实验。这分别比裸Ag ₃ PO ₄和TiO ₂高3.5和11.7倍。表征结果表明，Ag ₃ PO ₄与TiO ₂之间形成异质结，明显促进了光催化CO _{2的生成。}通过促进光生载流子的分离和迁移来进行还原反应。这项研究证明，Ag ₃ PO ₄ / TiO ₂催化剂可以有效地利用太阳能将CO ₂还原为CO。