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Closing the green gap of photosystem I with synthetic fluorophores for enhanced photocurrent generation in photobiocathodes

  • One restriction for biohybrid photovoltaics is the limited conversion of green light by most natural photoactive components. The present study aims to fill the green gap of photosystem I (PSI) with covalently linked fluorophores, ATTO 590 and ATTO 532. Photobiocathodes are prepared by combining a 20 μm thick 3D indium tin oxide (ITO) structure with these constructs to enhance the photocurrent density compared to setups based on native PSI. To this end, two electron transfer mechanisms, with and without a mediator, are studied to evaluate differences in the behavior of the constructs. Wavelength-dependent measurements confirm the influence of the additional fluorophores on the photocurrent. The performance is significantly increased for all modifications compared to native PSI when cytochrome c is present as a redox-mediator. The photocurrent almost doubles from −32.5 to up to −60.9 μA cm−2. For mediator-less photobiocathodes, interestingly, drastic differences appear between the constructs made with various dyes. While the turnover frequency (TOF) is doubled to 10 e−/PSI/s for PSI-ATTO590 on the 3D ITO compared to the reference specimen, the photocurrents are slightly smaller since the PSI-ATTO590 coverage is low. In contrast, the PSI-ATTO532 construct performs exceptionally well. The TOF increases to 31 e−/PSI/s, and a photocurrent of −47.0 μA cm−2 is obtained. This current is a factor of 6 better than the reference made with native PSI in direct electron transfer mode and sets a new record for mediator-free photobioelectrodes combining 3D electrode structures and light-converting biocomponents.

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Metadaten
Author:Sascha MorlockORCiD, Senthil Kumar Subramanian, Athina ZouniORCiD, Fred LisdatORCiDGND
URN:urn:nbn:de:kobv:526-opus4-17022
DOI (Version of Record):https://doi.org/10.1039/D2SC05324A
Parent Title (English):Chemical Science
Publisher:Royal Society of Chemistry (RSC)
Document Type:Article
Language:English
Year of Publication:2023
Publishing Institution:Technische Hochschule Wildau
Release Date:2023/02/17
Volume:14
First Page:1696
Last Page:1708
Source:Chem. Sci., 2023,14, 1696-1708
Faculties an central facilities:Fachbereich Ingenieur- und Naturwissenschaften
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 572 Biochemie
Licence (German):Creative Commons - CC BY-NC 3.0 - Namensnennung-Nicht kommerziell 3.0 Unported
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