Photocatalytic Enhancement for CO2 Reduction Using Au Nanoparticles Supported on Fe‐Doped SrTiO3−δ Perovskite

This study focuses on the use of Au nanoparticles supported on the SrTiO 3− δ perovskite doped with Fe ions as a photocatalyst for CO 2 reduction and methanol production using water as the hydrogen supplier. The photocatalytic evaluation of the synthesized materials shows that Au nanoparticles supported on the SrTi (1− x ) Fe x O 3− δ perovskites can enhance photocatalytic CO 2 reduction. The sample with the doping level x = 0.125 has the highest methanol production, 9.5 times more than the undoped sample and 3.5 times more than its counterpart without Au nanoparticles. The results of the DFT + U calculations show that the contributions from the iron atoms states reduce the energy gap in the perovskite composite, SrTi (1− x ) Fe x O 3− δ . Additionally, Fe incorporation endows the system with the capacity to create electron–hole pairs via direct band transitions at the high‐symmetry point R with the doping levels of x = 0.125 and x = 0.250.