Photosystem I/molecular wire/metal nanoparticle bioconjugates for the photocatalytic production of H2

Rebecca A. Grimme, Carolyn E. Lubner, Donald A. Bryant, John H. Golbeck

Research output: Contribution to journalArticlepeer-review

102 Scopus citations

Abstract

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 ∼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.

Original languageEnglish (US)
Pages (from-to)6308-6309
Number of pages2
JournalJournal of the American Chemical Society
Volume130
Issue number20
DOIs
StatePublished - May 21 2008

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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