LED-driven controlled deposition of Ni onto TiO2 for visible-light expanded conversion of carbon dioxide into C1–C2 alkanes. Issue 13 (21st May 2021)

• Record Type: Journal Article
• Authors: Sanz-Marco, Arturo; Hueso, José L.; Sebastian, Víctor; Nielsen, David; Mossin, Susanne; Holgado, Juan P.; Bueno-Alejo, Carlos J.; Balas, Francisco; Santamaria, Jesus
• Is Part Of: Nanoscale advances. Volume 3:Issue 13(2021)
• Page Start: 3788
• Page End: 3798
• Publication Date: 2021-05-21
• Subjects: 620.5
• DOI: 10.1039/d1na00021g
• Languages: English
• ISSNs: 2516-0230

Abstract

Abstract : Photodeposited 5 nm Ni nanoparticles on TiO2 P25 catalysts promote the photocatalytic hydrogenation of CO2 under visible light to CH4 and C2 H6 . Abstract : Photocatalytic gas-phase hydrogenation of CO2 into alkanes was achieved over TiO2 -supported Ni nanoparticles under LED irradiation at 365 nm, 460 nm and white light. The photocatalysts were prepared using photo-assisted deposition of Ni salts under LED irradiation at 365 nm onto TiO2 P25 nanoparticles in methanol as a hole scavenger. This procedure yielded 2 nm Ni particles decorating the surface of TiO2 with a nickel mass content of about 2%. Before the photocatalytic runs, Ni/TiO2 was submitted to thermal reduction at 400 °C in a 10% H2 atmosphere which induced O-defective TiO2− x substrates. The formation of oxygen vacancies, Ti 3+ centers and metallic Ni sites upon photocatalytic CO2 hydrogenation was confirmed by operando EPR analysis. In situ XPS under reaction conditions suggested a strong metal–support interaction and the co-existence of zero and divalent Ni states. These photoactive species enhanced the photo-assisted reduction of CO2 below 300 °C to yield CO, CH4 and C2 H6 as final products.