Modification of eosin Y and cobalt molecular catalyst system with reduced graphene oxide for enhanced photocatalytic hydrogen production. Issue 14 (26th June 2020)

• Record Type: Journal Article
• Authors: Lewandowska-Andralojc, Anna; Malolepszy, Artur; Stritt, Anika; Grohmann, Andreas
• Is Part Of: Catalysis science & technology. Volume 10:Issue 14(2020)
• Page Start: 4693
• Page End: 4702
• Publication Date: 2020-06-26
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/d0cy00937g
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : Reduced graphene oxide enhances photocatalytic hydrogen production in the system composed of Eosin Y and molecular catalyst Co(bpy)3 2+ . Abstract : By using reduced graphene oxide (RGO) as a support for the molecular cobalt catalyst (Co(bpy)3 2+ ), a new composite material RGO–Co(bpy)3 2+ for photocatalytic hydrogen production was prepared. The photocatalytic system, containing eosin Y (EY) as a sensitizer, Co(bpy)3 2+ as a catalyst, RGO as a support and triethylamine (TEA) as a sacrificial electron donor, exhibited under visible light irradiation a 2.2 times increase in hydrogen production in comparison to the system without RGO. The composites display a higher turnover number (TON), up to 185 based on Co(bpy)3 2+ and the highest apparent quantum yield reached 7.4% at 505 nm. Hydrogen production enhancement in the presence of RGO is attributed to the more efficient electron-transfer to the catalyst and retardation of the self-degradation path of EY radical anion mediated by RGO, which was verified using steady-state and time-resolved spectroscopy.