Journal
LANGMUIR
Volume 31, Issue 5, Pages 1675-1682Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la503776b
Keywords
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Funding
- National Science Foundation [ECS-0335765]
- Photosynthetic Antenna Research Center (PARC), an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Basic Energy Science [DE-SC 0001035]
- McDonnell International Scholars Academy
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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.
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