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The international journal for inorganic, organometallic and bioinorganic chemistry
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Paper
Dalton Trans., 2009, 10106 - 10113, DOI: 10.1039/b909137h
Maximizing H2 production in Photosystem I/dithiol molecular wire/platinum nanoparticle bioconjugates
Rebecca Ann Grimme, Carolyn Elizabeth Lubner and John Harvey Golbeck
Photosystem I/dithiol molecular wire/nanoparticle bioconjugates have been shown to photocatalytically generate dihydrogen at linear rates when continuously illuminated. In an effort to maximize H2 production, the pH and ionic concentration of the solution, the mobility of the electron donor, the length and degree of saturation of the molecular wire, and the intensity of the light were systematically investigated. Optimal conditions included a solution buffered at pH 6.0, cross-linked plastocyanin, rebuilt spinach PS I, and the use of 1,4-benzenedithiol to connect PS I to the Pt nanoparticle. Illumination of this optimized Photosystem I/dithiol molecular wire/nanoparticle bioconjugate at a light intensity of 70
E m-2 s-1 generated a measured one time H2 production rate of 312 mol H2 mg Chl-1 h-1.
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