Photosynthetic apparatus of Rhodobacter sphaeroides exhibits prolonged charge storage
| Autor: | Abdelnaby M. Elshahawy, Piper A Rawding, Kevin Huang, Michael R. Jones, Wanxin Sun, Fangfang Zhao, Sai Kishore Ravi, John Wang, Swee Ching Tan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Bioelectric Energy Sources Science Photoprotein Light-Harvesting Protein Complexes General Physics and Astronomy BrisSynBio 02 engineering and technology Rhodobacter sphaeroides 010402 general chemistry Photosynthesis 01 natural sciences 7. Clean energy Capacitance Electric charge General Biochemistry Genetics and Molecular Biology Article Electron Transport Electrochemistry lcsh:Science Synthetic biology Multidisciplinary biology Bristol BioDesign Institute Charge (physics) General Chemistry 021001 nanoscience & nanotechnology biology.organism_classification 0104 chemical sciences Solar energy harvesting Photoexcitation Chemical physics lcsh:Q 0210 nano-technology Electromagnetic Phenomena |
| Zdroj: | Nature Communications, Vol 10, Iss 1, Pp 1-10 (2019) Nature Communications Ravi, S K, Rawding, P, Elshahawy, A M, Huang, K, Sun, W, Zhao, F, Wang, J, Jones, M R & Tan, S C 2019, ' Photosynthetic apparatus of Rhodobacter sphaeroides exhibits prolonged charge storage ', Nature Communications, vol. 10, no. 1, 902 . https://doi.org/10.1038/s41467-019-08817-7 |
| ISSN: | 2041-1723 |
| Popis: | Photosynthetic proteins have been extensively researched for solar energy harvesting. Though the light-harvesting and charge-separation functions of these proteins have been studied in depth, their potential as charge storage systems has not been investigated to the best of our knowledge. Here, we report prolonged storage of electrical charge in multilayers of photoproteins isolated from Rhodobacter sphaeroides. Direct evidence for charge build-up within protein multilayers upon photoexcitation and external injection is obtained by Kelvin-probe and scanning-capacitance microscopies. Use of these proteins is key to realizing a ‘self-charging biophotonic device’ that not only harvests light and photo-generates charges but also stores them. In strong correlation with the microscopic evidence, the phenomenon of prolonged charge storage is also observed in primitive power cells constructed from the purple bacterial photoproteins. The proof-of-concept power cells generated a photovoltage as high as 0.45 V, and stored charge effectively for tens of minutes with a capacitance ranging from 0.1 to 0.2 F m−2. Photosynthetic proteins are used to harvest solar energy in bio-photovoltaics, but are typically not investigated for charge storage. Here the authors report prolonged charge storage in multilayers of photoproteins as well as a proof-of-principle biophotonic power cell with purple bacterial photoproteins. |
| Databáze: | OpenAIRE |
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