Photosystem I on Graphene as a Highly Transparent, Photoactive Electrode

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• 作者：Darlene Gunther ; Gabriel LeBlanc ; Dhiraj Prasai ; Jamie R. Zhang ; David E. Cliffel ; Kirill I. Bolotin ; G. Kane Jennings
• 刊名：Langmuir
• 出版年：2013
• 出版时间：April 2, 2013
• 年：2013
• 卷：29
• 期：13
• 页码：4177-4180
• 全文大小：240K
• 年卷期：v.29,no.13(April 2, 2013)
• ISSN：1520-5827

文摘

We report the fabrication of a hybrid light-harvesting electrode consisting of photosystem I (PSI) proteins extracted from spinach and adsorbed as a monolayer onto electrically contacted, large-area graphene. The transparency of graphene supports the choice of an opaque mediator at elevated concentrations. For example, we report a photocurrent of 550 nA/cm² from a monolayer of PSI on graphene in the presence of 20 mM methylene blue, which yields an opaque blue solution. The PSI-modified graphene electrode has a total thickness of less than 10 nm and demonstrates photoactivity that is an order of magnitude larger than that for unmodified graphene, establishing the feasibility of conjoining these nanomaterials as potential constructs in next-generation photovoltaic devices.