Oxygen-Evolving Porous Glass Plates Containing the Photosynthetic Photosystem II Pigment–Protein Complex
| Autor: | Tomoyasu Noji, Shigeru Itoh, Jian Ren Shen, Takehisa Dewa, Tetsuro Jin, Nobuo Kamiya, Mamoru Nango, Keisuke Kawakami |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Hydrogen
Photosystem II chemistry.chemical_element 02 engineering and technology Manganese Porous glass Cyanobacteria 010402 general chemistry Photochemistry Photosynthesis 01 natural sciences Artificial photosynthesis Nanopores Bacterial Proteins Electrochemistry General Materials Science Spectroscopy chemistry.chemical_classification Chemistry Photosystem II Protein Complex Surfaces and Interfaces Electron acceptor 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Oxygen Water splitting 2 6-Dichloroindophenol Glass 0210 nano-technology Porosity |
| Zdroj: | Langmuir. 32:7796-7805 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/acs.langmuir.6b02106 |
| Popis: | The development of artificial photosynthesis has focused on the efficient coupling of reaction at photoanode and cathode, wherein the production of hydrogen (or energy carriers) is coupled to the electrons derived from water-splitting reactions. The natural photosystem II (PSII) complex splits water efficiently using light energy. The PSII complex is a large pigment-protein complex (20 nm in diameter) containing a manganese cluster. A new photoanodic device was constructed incorporating stable PSII purified from a cyanobacterium Thermosynechococcus vulcanus through immobilization within 20 or 50 nm nanopores contained in porous glass plates (PGPs). PSII in the nanopores retained its native structure and high photoinduced water splitting activity. The photocatalytic rate (turnover frequency) of PSII in PGP was enhanced 11-fold compared to that in solution, yielding a rate of 50-300 mol e(-)/(mol PSII·s) with 2,6-dichloroindophenol (DCIP) as an electron acceptor. The PGP system realized high local concentrations of PSII and DCIP to enhance the collisional reactions in nanotubes with low disturbance of light penetration. The system allows direct visualization/determination of the reaction inside the nanotubes, which contributes to optimize the local reaction condition. The PSII/PGP device will substantively contribute to the construction of artificial photosynthesis using water as the ultimate electron source. |
| Databáze: | OpenAIRE |
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