Photoinduced Electron Transfer Pathways in Hydrogen-Evolving Reduced Graphene Oxide-Boosted Hybrid Nano-Bio Catalyst

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• 作者：Peng Wang ; Nada M. Dimitrijevic ; Angela Y. Chang ; Richard D. Schaller ; Yuzi Liu ; Tijana Rajh ; Elena A. Rozhkova
• 刊名：ACS Nano
• 出版年：2014
• 出版时间：August 26, 2014
• 年：2014
• 卷：8
• 期：8
• 页码：7995-8002
• 全文大小：506K
• ISSN：1936-086X

文摘

Photocatalytic production of clean hydrogen fuels using water and sunlight has attracted remarkable attention due to the increasing global energy demand. Natural and synthetic dyes can be utilized to sensitize semiconductors for solar energy transformation using visible light. In this study, reduced graphene oxide (rGO) and a membrane protein bacteriorhodopsin (bR) were employed as building modules to harness visible light by a Pt/TiO₂ nanocatalyst. Introduction of the rGO boosts the nano-bio catalyst performance that results in hydrogen production rates of approximately 11.24 mmol of H₂ (渭mol protein)^鈭? h^鈥?. Photoelectrochemical measurements show a 9-fold increase in photocurrent density when TiO₂ electrodes were modified with rGO and bR. Electron paramagnetic resonance and transient absorption spectroscopy demonstrate an interfacial charge transfer from the photoexcited rGO to the semiconductor under visible light.

Keywords:

graphene; bacteriorhodopsin; Pt/TiO₂ nanoparticles; visible light; hydrogen fuels; nano-bio materials