The artificial photosynthesis for visible-light-driven CO₂ reduction with H₂O is promising to solve both energy and environmental issues simultaneously. Herein, we have successfully fabricated all-solid-state Z-scheme ternary photocatalysts, consisting of two isolated photochemical systems of graphitic carbon nitride (g-C₃N₄) and three-dimensional ordered macroporous carbon-coated TiO₂ (3DOM-TiO₂@C) combined with Pt nanoparticles as electron-transfer system. Photonic crystal structure and carbon-coated nanolayers of 3DOM-TiO₂@C support enhance visible light-harvesting efficiency. The vectorial photoelectron transferring of TiO₂@C → Pt → g-C₃N₄ boosts the separation and surface enrichment efficiencies of photogenerated electrons and holes. All-solid-state Z-scheme ternary photocatalyst exhibits the outstanding yields of CH₄ (6.56 μmol h⁻¹, 0.1 g catalyst) and high-efficient quantum efficiency (5.67%) during visible-light-driven conversion of CO₂ with H₂O. The surface enrichment of electrons and CO₂ is the rate-determining step of selective CO₂ photoreduction. This study is expected to throw new light on the fabrication of high-efficient photocatalyst for CO₂ conversion to hydrocarbon.

借助H ₂ O进行可见光驱动的CO ₂还原的人工光合作用有望同时解决能源和环境问题。在这里，我们已经成功地制备了全固态Z方案三元光催化剂，该催化剂由两个孤立的石墨化碳氮化物（gC ₃ N ₄）和三维有序大孔碳包覆的TiO ₂（3DOM-TiO ₂ @ C）与Pt纳米粒子结合作为电子传输系统。光子晶体结构和3DOM-TiO ₂ @C载体的碳涂层纳米层提高了可见光收集效率。TiO ₂的矢量光电子转移@C→Pt→gC ₃ N ₄增强了光生电子和空穴的分离和表面富集效率。全固态Z-方案三元光催化剂显示出CH的优秀的产率₄（6.56微摩尔ħ ^-1 CO的可见光驱动转换过程中，将0.1g催化剂）和高效率的量子效率（5.67％）₂用H ₂ O.电子和CO ₂的表面富集是选择性CO _2光还原的决定速率的步骤。该研究有望为将CO ₂转化为烃的高效光催化剂的制备提供新的思路。