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1: J Am Chem Soc. 2008 May 21;130(20):6308-9. Epub 2008 Apr 26.
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Photosystem I/molecular wire/metal nanoparticle bioconjugates for the photocatalytic production of H2.

Grimme RA, Lubner CE, Bryant DA, Golbeck JH.

Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, USA. rug132@psu.edu

Photosystem I (PS I) is a robust photosynthetic complex that adeptly captures photons to create a charge-separated state with a quantum efficiency that approaches 1.0. This charge-separated state is stable for approximately 100 ms, and the low-potential reductant that is produced is poised at a redox potential favorable for H2 evolution. PS I has been covalently linked to Pt and Au nanoparticle surfaces by 1,6-hexanedithiol which serves as a molecular wire to both connect PS I to the particles and transfer electrons from the terminal electron transfer cofactor of PS I, FB, to the nanoparticle. Illumination of these Photosystem I/molecular wire/nanoparticle bioconjugates is able to catalyze the reaction: 2H+ + 2e(-)--> H2. Transfer of the electrons from PS I to the nanoparticle through the molecular wire is not rate-limiting for H2 evolution. Supplying the system with more efficient donor-side electron donating species results in a 5-fold increase in the rate of H2 evolution.

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PMID: 18439011 [PubMed - indexed for MEDLINE]