Synergistic effects of oxygen vacancies and mesoporous structures in amorphous C@TiO2 for photocatalytic CO2 reduction
Binxia Yuan, Yuhao Liu, Hong Qian, Rui Zhu, Chengxi Zhang, Weiling Luan
Abstract
In this study, the theoretical calculations proves that the combination of oxygen vacancy and amorphous carbon films in TiO 2 (V O -CT) can effectively reduce the energy bandgap and work function. The minimum Gibbs free energies required for the CO 2 RR reaction of V O -CT are 0.20 eV, which is lower than pure TiO 2 . The amorphous c@TiO 2 nanomaterials with oxygen vacancy and mesoporous structures (V O -MCT) are prepared with the P123 surfactant as the template and oxalic acid as an inducer. The electron paramagnetic resonance indicates the presence of abundant oxygen vacancy defects in the samples. UV-vis spectra indicate that the mesoporous structure enhances light absorption capacity. The photocatalytic CO 2 reduction tests show that the highest conversion rates for CH 4 and CO of V O -MCT are 14 μmol g −1 h −1 and 10.66 μmol g −1 h −1 , respectively. The electron consumption rate of V O -MCT is 12.43 times higher than that of commercial TiO 2 (P200).