Photoelectrochemical complexes for solar energy conversion that chemically and autonomously regenerate

Nat Chem. 2010 Nov;2(11):929-936. doi: 10.1038/nchem.822. Epub 2010 Sep 5.

Abstract

Naturally occurring photosynthetic systems use elaborate pathways of self-repair to limit the impact of photo-damage. Here, we demonstrate a complex consisting of two recombinant proteins, phospholipids and a carbon nanotube that mimics this process. The components self-assemble into a configuration in which an array of lipid bilayers aggregate on the surface of the carbon nanotube, creating a platform for the attachment of light-converting proteins. The system can disassemble upon the addition of a surfactant and reassemble upon its removal over an indefinite number of cycles. The assembly is thermodynamically metastable and can only transition reversibly if the rate of surfactant removal exceeds a threshold value. Only in the assembled state do the complexes exhibit photoelectrochemical activity. We demonstrate a regeneration cycle that uses surfactant to switch between assembled and disassembled states, resulting in an increased photoconversion efficiency of more than 300% over 168 hours and an indefinite extension of the system lifetime.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Electrochemistry*
  • Lipid Bilayers
  • Nanotubes, Carbon
  • Phospholipids / chemistry
  • Photochemistry*
  • Recombinant Proteins / chemistry
  • Solar Energy*

Substances

  • Lipid Bilayers
  • Nanotubes, Carbon
  • Phospholipids
  • Recombinant Proteins