Fullerene C<sub>70</sub>‐Encapsulated Tetrathiafulvalene‐Co Porphyrin Covalent Organic Framework: Driving Multistep Charge Transfer to Boost CO<sub>2</sub> Photoreduction
Ying Jiang, Chong Wang, Chong Wang, Tian Dong, Yupeng Song, Tao Wang, Haibing Che, Hua Sheng, Bo Wu, Chunru Wang, Chunru Wang
Abstract
Abstract Constructing an efficient charge transfer system can significantly enhance photocatalytic CO 2 reduction, yet efficient construction strategies remain to be explored. In this work, fullerene C 70 is encapsulated into the tetrathiafulvalene‐Co porphyrin (TTF‐CoTPP) COF to fabricate an efficient photocatalyst C 70 @COF. Transient absorption (TA) spectra indicate that C 70 significantly promotes photogenerated charge separation (0.3 ps), subsequently driving multistep charge transfer within the composite system. This process ultimately yields a long‐lived charge‐separated state, TTF •+ ‐CoTPP‐C 70 •− (>5 ns). Density functional theory (DFT) calculation reveals that the encapsulation of C 70 forms a new electron transfer pathway and reduces the energy barrier for * COOH intermediate formation. The C 70 @COF exhibits a remarkable CO production rate of 4963.24 µmol g h −1 , a 1.95‐fold enhancement over the pristine COF. This work highlights the potential of fullerene in boosting photocatalytic CO 2 reduction performance and offers a facile strategy to design novel COF‐based photocatalysts.