Design of SrTiO 3 -based catalysts for photocatalytic CO 2 reduction

• Published in: Catalysis science & technology
• Main Authors: Boga, Bíborka, Moustakas, Nikolaos G., Han, Yunyan, Jiao, Haijun, Kreyenschulte, Carsten, Naliwajko, Pawel, Duong, Thi Thanh Hoa, Ding, Shuoping, Ngo, Anh Binh, Hezam, Abdo, Peppel, Tim, Cristea, Vasile-Mircea, Steinfeldt, Norbert, Strunk, Jennifer
• Format: Journal Article
• Language: English
• Published: 2024
• ISSN: 2044-4753; 2044-4761
• DOI: 10.1039/D4CY00313F

Herein, the preparation of SrTiO 3 -based catalysts ( i.e. , NiO/support, Au-support and Au–NiO/support, where the supports were SrTiO 3 and SrTiO 3 –SrCO 3 ) for photocatalytic CO 2 reduction considering strategic design principles is presented. The samples were comprehensively analyzed via complementary methods, such as SEM-EDX, XRD, nitrogen sorption, XPS and UV-vis (DRS), in situ EPR and in situ DRIFTS. The CO 2 photoreduction activity of the samples was assessed in a high-purity gas-phase photoreactor under batch conditions. The investigations highlighted that the reaction pathway ( i.e. , selective H 2 and C 2 H 6 production vs. CH 4 ) can be influenced by the modification of the electronic properties ( i.e. , Fermi level alignment), the interaction between Au NPs and oxygen vacancies ( i.e. , in situ EPR) and the enhanced charge separation in the presence of SrCO 3 . The participation of the structural carbonates in the reaction in association with the functionality of the components is discussed.