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Modification of eosin Y and cobalt molecular catalyst system with reduced graphene oxide for enhanced photocatalytic hydrogen production

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Abstract

By using reduced graphene oxide (RGO) as a support for the molecular cobalt catalyst (Co(bpy)32+), a new composite material RGO–Co(bpy)32+ for photocatalytic hydrogen production was prepared. The photocatalytic system, containing eosin Y (EY) as a sensitizer, Co(bpy)32+ 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)32+ 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.

Graphical abstract: Modification of eosin Y and cobalt molecular catalyst system with reduced graphene oxide for enhanced photocatalytic hydrogen production

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Supplementary files

Article information


Submitted
07 May 2020
Accepted
19 Jun 2020
First published
22 Jun 2020

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

Modification of eosin Y and cobalt molecular catalyst system with reduced graphene oxide for enhanced photocatalytic hydrogen production

A. Lewandowska-Andralojc, A. Malolepszy, A. Stritt and A. Grohmann, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/D0CY00937G

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