Herein, the catalysts of ultrathin g-C₃N₄ surface-modified hollow spherical Bi₂MoO₆ (g-C₃N₄/Bi₂MoO₆, abbreviated as CN/BMO) were fabricated by the co-solvothermal method. The variable valence Mo⁵⁺/Mo⁶⁺ ionic bridge in CN/BMO catalysts can boost the rapid transfer of photogenerated electrons from Bi₂MoO₆ to g-C₃N₄. And the synergy effect of g-C₃N₄ and Bi₂MoO₆ components remarkably enhance CO₂ adsorption capability. CN/BMO-2 catalyst has the best performances for visible light-driven CO₂ reduction compared with single Bi₂MoO₆ and g-C₃N₄, i.e., its amount and selectivity of CO product are 139.50 μmol g⁻¹ and 96.88% for 9 h, respectively. Based on the results of characterizations and density functional theory calculation, the photocatalytic mechanism for CO₂ reduction is proposed. The high-efficient separation efficiency of photogenerated electron-hole pairs, induced by variable valence Mo⁵⁺/Mo⁶⁺ ionic bridge, can boost the rate-limiting steps (COOH*-to-CO* and CO* desorption) of selective visible light-driven CO₂ conversion into CO. It inspires the establishment of efficient photocatalysts for CO₂ conversion.

本文采用共溶剂热法制备了超薄gC ₃ N ₄表面修饰空心球形Bi ₂ MoO ₆催化剂（gC ₃ N ₄ /Bi ₂ MoO ₆，简称CN/BMO）。CN/BMO催化剂中可变价的Mo ⁵⁺ /Mo ^{6+离子桥可以促进光生电子从Bi} ₂ MoO ₆到gC ₃ N ₄的快速转移。_{以及gC 3} N ₄和Bi ₂ MoO ₆的协同作用组分显着提高CO ₂吸附能力。与单一的Bi ₂ MoO ₆和gC ₃ N ₄相比，CN/BMO-2催化剂在可见光驱动CO ₂还原方面具有最佳性能，即其CO产物的量和选择性分别为139.50 μmol g ⁻¹和96.88% 9小时，分别。基于表征和密度泛函理论计算的结果，提出了CO _{2还原的光催化机理。}^{变价Mo 5+} /Mo ⁶⁺诱导的光生电子-空穴对的高效分离效率_{离子桥，可以促进选择性可见光驱动的 CO 2}转化为 CO 的限速步骤（COOH*-to-CO* 和 CO* 解吸）。它激发了用于 CO ₂转化的高效光催化剂的建立。