Linker-free deposition and adhesion of photosystem i onto nanostructured TiO2 for biohybrid photoelectrochemical cells

Vivek B. Shah, William R. Henson, Tandeep S. Chadha, Gerard Lakin, Haijun Liu, Robert E. Blankenship, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


Photosystem I (PSI) from oxygenic photosynthetic organisms is an attractive sensitizer for nano-biohybrid solar cells as it has a combined light-harvesting and reaction center in one protein complex and operates at a quantum yield close to one in biological systems. Using a linker-free deposition technique enabled by an electrospray system, PSI was coupled to 1-D nanostructured titanium dioxide thin films to fabricate an electrode for a photoelectrochemical cell. After deposition, the surfactant in the PSI aggregate was dissolved in the surfactant-free electrolyte, ensuring that partly hydrophobic PSI was not resuspended and stayed in contact with titanium dioxide. A maximum current density of 4.15 mA cm-2 was measured after 10 min of electrospray deposition, and this is the highest current density reported so far for PSI-based photoelectrochemical cells. The high current is attributed to 1D nanostructure of titanium dioxide and orientation of the PSI onto the surface, which allows easy transfer of electrons.

Original languageEnglish (US)
Pages (from-to)1675-1682
Number of pages8
Issue number5
StatePublished - Feb 10 2015
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry


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