The limited CO₂ content in aqueous solution and low adsorption amount of CO₂ on catalyst surface lead to poor photocatalytic CO₂ reduction activity and selectivity. Herein, the design and fabrication of a novel photocatalytic architecture is reported, accomplished via chemical vapor deposition of polymeric carbon nitride on carbon paper. The as-obtained samples with a hydrophobic surface exhibit excellent CO₂ transport and adsorption ability, as well as the building of triphase air-liquid-solid (CO₂-H₂O-catalyst) joint interfaces, eventually resulting in the inhibition of H₂ evolution and great promotion of CO₂ reduction with a selectivity of 78.6%. The addition of phosphate to reaction environment makes further improvement of CO₂ photoreduction into carbon fuels with a selectivity of 93.8% and an apparent quantum yield of 0.4%. This work provides new insight for constructing efficient photocatalytic architecture of CO₂ photoreduction in aqueous solution and demonstrates that phosphate could play a key role in this process.

水溶液中有限的CO ₂含量和催化剂表面对CO _{2 的}吸附量低导致光催化CO ₂还原活性和选择性较差。本文报道了一种新型光催化结构的设计和制造，该结构通过聚合氮化碳在碳纸上的化学气相沉积实现。所获得的具有疏水表面的样品表现出优异的 CO ₂传输和吸附能力，以及三相气-液-固（CO ₂ -H ₂ O-催化剂）联合界面的建立，最终导致对 H 的抑制₂ CO _{2 的}演化与大促进选择性为 78.6%。在反应环境中加入磷酸盐进一步提高了CO _{2 光}还原成碳燃料的选择性，选择性为93.8%，表观量子产率为0.4%。这项工作为构建水溶液中CO ₂光还原的高效光催化结构提供了新的见解，并证明磷酸盐可以在该过程中发挥关键作用。