Photocatalytic CO₂ conversion efficiency is hampered by the rapid recombination of photogenerated charge carriers. It is effective to suppress the recombination by constructing cocatalysts on photocatalysts with high-quality interfacial contact. Herein, we develop a novel strategy to in-situ grow ultrathin N-doped graphene (NG) layer on TiO₂ hollow spheres (HS) with large area and intimate interfacial contact via a chemical vapor deposition (CVD). The optimized TiO₂/NG HS nanocomposite achieves total CO₂ conversion rates (the sum yield of CO, CH₃OH and CH₄) of 18.11 μmol g⁻¹ h⁻¹, which is about 4.6 times higher than blank TiO₂ HS. Experimental results demonstrate that intimate interfacial contact and abundant pyridinic N sites can effectively facilitate photogenerated charge carrier separation and transport, realizing enhanced photocatalytic CO₂ reduction performance. In addition, this work provides an effective strategy for in-situ construction of graphene-based photocatalysts for highly efficient photocatalytic CO₂ conversion.

光生电荷载流子的快速复合阻碍了光催化 CO ₂转换效率。通过在具有高质量界面接触的光催化剂上构建助催化剂来有效抑制复合。在本文中，我们开发了一种新的策略，以在-原位成长超薄Ñ在TiO掺杂石墨烯（NG）层_2个空心球（HS）与大面积，并通过化学汽相沉积（CVD）亲密界面接触。优化后的 TiO ₂ /NG HS 纳米复合材料的总 CO ₂转化率（CO、CH ₃ OH 和 CH ₄的总产率）为 18.11 μmol g ^-1 h^-1，比空白 TiO ₂ HS高约 4.6 倍。实验结果表明，紧密的界面接触和丰富的吡啶氮位点可以有效地促进光生电荷载流子的分离和传输，实现增强的光催化 CO ₂还原性能。此外，该工作提供了一种有效的策略用于在-原位施工高效的光催化CO基于石墨烯的光催化剂₂的转换。