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Title: Photosynthetic apparatus of Rhodobacter sphaeroides exhibits prolonged charge storage
Authors: Ravi, S.K. 
Rawding, P.
Elshahawy, A.M.
Huang, K.
Sun, W.
Zhao, F.
Wang, J. 
Jones, M.R.
Tan, S.C. 
Issue Date: 2019
Publisher: Nature Publishing Group
Citation: 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 10 (1) : 902. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: 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 . © 2019, The Author(s).
Source Title: Nature Communications
ISSN: 2041-1723
DOI: 10.1038/s41467-019-08817-7
Rights: Attribution 4.0 International
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