Pb-N Chemically Anchors CsPbBr₃ on 1D Porous Tubular g-C₃N₄ for Enhanced Photocatalytic CO₂ Reduction

Halide perovskite CsPbBr₃ (CPB) quantum dots (QDs) are considered as a promising candidate for solar-driven CO₂ conversion for their unique optoelectronic properties and suitable band structures. However, the CO₂ conversion efficiency of pristine CsPbBr₃ quantum dots is severely limited due to their rapid electron-hole pair recombination and insufficient active sites. In this study, by immobilizing CPB QDs onto one-dimensional (1D) porous tubular g-C₃N₄ (TCN), an effective 0D/1D CPB@TCN heterojunction photocatalyst for CO₂ reduction is fabricated. Density functional theory (DFT) calculations combined with experimental studies demonstrate that CPB QDs are uniformly anchored on the surface of TCN through Pb-N chemical bonding, resulting in efficient separation and transfer of photogenerated carriers in CPB@TCN photocatalysts. The resultant CPB@TCN photocatalysts exhibit significantly enhanced photocatalytic activity for CO₂ reduction with the highest conversion rate of 22.62 μmol g^-1 h^-1, which is 5.33-times higher than that of pristine CPB QDs. This work unveils the interfacial bonding mechanism of CPB@TCN heterojunction through Pb-N chemical bond, which provides new insights for the development perovskite-based heterojunction photocatalysts.