Photocatalytic conversion of low-concentration CO₂ with H₂O oxidation indicates an applicable way to achieve sustainable carbon cycling and solve the global warming problem. Enhancing photogenerated charge separation and surface adsorption and catalytic process of photocatalysts is the crucial point to compensate for the mass transfer limitation during low-concentration CO₂ conversion. Herein, a highly-crystalline Ag_xNa_1−xTaO₃-AgCl heterostructure composite was successfully fabricated via a one-step flux method. The in-situ formation of intimate heterojunction between Ag_xNa_1−xTaO₃ and AgCl facilitated the separation and transfer of photogenerated charges. Moreover, the simultaneous introduction of Ag cations and AgCl components promoted the adsorption and activation of CO₂ on the photocatalyst surface. When combined with metallic Ag cocatalysts, the Ag_xNa_1−xTaO₃-AgCl heterostructure photocatalyst exhibited an improved activity for the overall reaction of CO₂ reduction and H₂O oxidation at low CO₂ concentration condition. The design of photocatalysts active at low CO₂ concentration accounts for an alternative way to construct the practical CO₂ conversion system in the future.

低浓度CO ₂与H ₂ O 氧化的光催化转化为实现可持续碳循环和解决全球变暖问题提供了一种可行的方法。增强光催化剂的光生电荷分离和表面吸附和催化过程是补偿低浓度CO ₂转化过程中传质限制的关键点。在此，通过一步助熔剂法成功制备了高度结晶的 Ag _x Na _1−x TaO _{3 -AgCl 异质结构复合材料。}Ag _x Na _1−x TaO之间原位形成紧密异质结₃和AgCl促进了光生电荷的分离和转移。此外，Ag阳离子和AgCl组分的同时引入促进了CO ₂在光催化剂表面的吸附和活化。当与金属银助催化剂结合时，Ag _x Na _1−x TaO _{3 -AgCl 异质结构光催化剂在低 CO 2}浓度条件下对 CO ₂还原和 H ₂ O 氧化的整体反应表现出更高的活性。_{在低 CO 2}浓度下具有活性的光催化剂的设计提供了一种构建实用 CO _{2的替代方法}未来的转换系统。