Linker-Free Deposition and Adhesion of Photosystem I onto Nanostructured TiO2 for Biohybrid Photoelectrochemical Cells

详细信息    查看全文

• 作者：Vivek B. Shah ; William R. Henson ; Tandeep S. Chadha ; Gerard Lakin ; Haijun Liu ; Robert E. Blankenship ; Pratim Biswas
• 刊名：Langmuir
• 出版年：2015
• 出版时间：February 10, 2015
• 年：2015
• 卷：31
• 期：5
• 页码：1675-1682
• 全文大小：469K
• ISSN：1520-5827

文摘

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^鈥? 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.