Enhanced Photocurrent Generation From a Single‐Mediated Photo‐Bioelectrochemical Cell Using Wild‐Type <i>Anabaena Variabilis</i> Dispersed in Solution

Lee, Sung Yong; Cho, Hyejun; Kim, Sung-Hyun

doi:10.1002/celc.202001026

Cited by 11 publications

(14 citation statements)

References 45 publications

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“…Electrons produced from water oxidation with irradiation are taken by the Os 3+ ‐RP so that most Os moieties are in the reduced state (Os 2+ ), indicating that Os 2+ complex pendant groups readily have access to the TM and take electrons to the electrode. A similar behavior has been observed when benzoquinone was used as a mediator in the solar energy conversion using cyanobacteria as photocatalysts [37] . It is not certain, however, where in the Z‐scheme Os‐RP takes electrons.…”

Section: Resultssupporting

confidence: 67%

“…A similar behavior has been observed when benzoquinone was used as a mediator in the solar energy conversion using cyanobacteria as photocatalysts. [37] It is not certain, however, where in the Zscheme Os-RP takes electrons. Determining from the formal potential of Os-RP ( � 0.29 V vs. normal hydrogen electrode, NHE), possible species are Q A (0.08 V) or plastoquinone (0.12 mV), whose formal potentials are more negative than that of Os-RP.…”

Section: Os-rp-mediated Electron Transfermentioning

confidence: 99%

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Solar Energy Conversion through Thylakoid Membranes Wired by Osmium Redox Polymer and Indium Tin Oxide Nanoparticles

et al. 2021

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For several decades, much attention has been paid to thylakoid membranes (TMs) as photocatalysts for converting solar light to electricity. Despite extensive research, current technology provides only limited photocurrents. Here, a novel method based on TM-composite material was developed for achieving high photocurrent. When a thin film composed of TMs, osmium redox polymer (Os-RP), and indium tin oxide nanoparticles (ITOnp) was formed on a porous graphite surface, appreciable photocurrent as high as 0.5 mA cm À 2 was achieved at 0.4 V vs. Ag/AgCl. Each component plays its own role in transferring electrons from TMs to the anode, resulting in sharp drop in photocurrent with missing any component. Optimization between these three components showed 1 : 0.5 : 30 (TM/Os-RP/ ITOnp) was the best ratio. Action spectra confirmed that TMs was the origin of photocurrent. It was inferred from blocking experiments using 3-(3,4-dichlorophenyl)-1,1-dimethylurea as an inhibitor that about 41 % of photocurrent was transferred from Q A in photosystem II to the electrode via Os-RP and ITOnp. Quantum efficiencies at 430 and 660 nm were 12.2 and 18.5 %, respectively. Turnover frequency for water oxidation depended upon the amount of the composite. A complete cell with Pt/C cathode produced P max of 122 μW cm À 2 at 758 μA cm À 2 under one sun illumination, which is the highest power density to our knowledge. This study opened a possibility of using TMs as photocatalysts for solar energy conversion.

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Section: Resultssupporting

confidence: 67%

Section: Os-rp-mediated Electron Transfermentioning

confidence: 99%

Solar Energy Conversion through Thylakoid Membranes Wired by Osmium Redox Polymer and Indium Tin Oxide Nanoparticles

et al. 2021

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“…However, such a high salinity requires the utilization of biocompatible microorganisms whose natural habitat is in saltwater. Another possibility to enhance the photocurrent is the utilization of exogenous electron mediators such as potassium ferricyanide [38]. However, it is a toxic chemical and therefore may not be feasible for usage in large-scale applicative technologies [39].…”

Section: Introductionmentioning

confidence: 99%

Electron Mediation and Photocurrent Enhancement in Dunalliela salina Driven Bio-Photo Electrochemical Cells

et al. 2021

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In recent years, finding alternatives for fossil fuels has become a major concern. One promising solution is microorganism-based bio-photo electrochemical cells (BPECs) that utilize photosynthetic solar energy conversion as an energy source while absorbing CO2 from the atmosphere. It was previously reported that in cyanobacterial-based BPECs, the major endogenous electron mediator that can transfer electrons from the thylakoid membrane photosynthetic complexes and external anodes is NADPH. However, the question of whether the same electron transfer mechanism is also valid for live eukaryotic microalgae, in which NADPH must cross both the chloroplast outer membrane and the cell wall to be secreted from the cell has remained elusive. In this work, we show that NADPH is also the major endogenous electron mediator in the microalgae Dunalliela salina (Ds). We show that the ability of Ds to tolerate high salinity enables the production of a photocurrent that is 5–6 times greater than previously reported for freshwater cyanobacterial-based BPECs in the presence or absence of exogenous electron mediators. Additionally, we show that the electron mediator Vitamin B1 can also function as an electron mediator enhancing photocurrent production. Finally, we show that the addition of both FeCN and NADP+ to Ds has a synergistic effect enhancing the photocurrent beyond the effect of adding each mediator separately.

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“…Exogenous artificial electron mediators such as Ferricyanide 36 can also enhance the photocurrent by accepting electrons at the external surface of the cells. Recently, it was discovered that bio-photo electrochemical cells are not limited to unicellular organisms and can be directly produced from macroalgae (seaweeds) 37 and green tissues of terrestrial plants such as leaves and stems.…”

Section: Introductionmentioning

confidence: 99%

Roots fuel cell produces and stores clean energy

Shlosberg

2022

Preprint

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In recent years, extensive scientific efforts are conducted to develop clean bio-energy technologies that have the potential to compete with the contaminating fossil fuels. Electricity production was previously generated from photosynthetic organisms in bio-photo electrochemical cells (BPECs), and microbial fuel cells (MFCs). The main approach of such methods was to exploit the ability of the organisms to perform external electron transfer (EET) to reduce the anode of an electrochemical cell. By far, these methods were applied to microorganisms, seaweeds, and plant leaves. The ability of roots to perform EET was applied in solutions that consist of molecular electron acceptors, however, it was not used for electricity production yet. In this work, we integrate green onion roots in a bio-electrochemical cell and show that it can produce continuous bias-free electric current for more than 24 h. This current is enhanced upon irradiation of light on the onion leaves. We apply 2D fluorescence maps to show that NADH serves as a major electron mediator between the roots and the anode, while its concentration in the external root matrix is increased upon irradiation of the leaves. Direct electricity production from roots may be integrated with soil based MFCs or plant leaves-based BPECs and pave the way towards the establishment of novel renewable energy technologies.

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Enhanced Photocurrent Generation From a Single‐Mediated Photo‐Bioelectrochemical Cell Using Wild‐Type Anabaena Variabilis Dispersed in Solution

Cited by 11 publications

References 45 publications

Solar Energy Conversion through Thylakoid Membranes Wired by Osmium Redox Polymer and Indium Tin Oxide Nanoparticles

Solar Energy Conversion through Thylakoid Membranes Wired by Osmium Redox Polymer and Indium Tin Oxide Nanoparticles

Electron Mediation and Photocurrent Enhancement in Dunalliela salina Driven Bio-Photo Electrochemical Cells

Roots fuel cell produces and stores clean energy

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