Redox hydrogels with adjusted redox potential for improved efficiency in Z-scheme inspired biophotovoltaic cellsElectronic supplementary information (ESI) available. See DOI: 10.1039/c4cp00380b
The improvement of Z-scheme inspired biophotovoltaics is achieved by fine tuning the properties of redox hydrogels applied as immobilization and electron conducting matrices for the photosystem-protein complexes. The formal potentials of the redox hydrogels are adjusted to the respective redox sites...
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Main Authors | , , , , , , , |
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Format | Journal Article |
Language | English |
Published |
28.05.2014
|
Online Access | Get full text |
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Summary: | The improvement of Z-scheme inspired biophotovoltaics is achieved by fine tuning the properties of redox hydrogels applied as immobilization and electron conducting matrices for the photosystem-protein complexes. The formal potentials of the redox hydrogels are adjusted to the respective redox sites in the photosystems for optimized electron transfer without substantial voltage loss. The anode is based on photosystem 2 (PS2) integrated in a phenothiazine modified redox hydrogel with a formal potential of −1 mV
vs.
SHE, which is 59 mV more positive than the Q
B
acceptor site in PS2. The cathode is based on photosystem 1 (PS1) contacted
via
an Os-complex based redox hydrogel with a formal potential of 395 mV
vs.
SHE,
i.e.
28 mV more negative than the primary P
700
electron acceptor of PS1. The potential difference between the two redox hydrogels is 396 mV. An open circuit voltage (
V
OC
) of 372.5 ± 2.1 mV could be achieved for the biophotovoltaic cell. The maximum power output is 1.91 ± 0.56 μW cm
−2
and the conversion efficiency (
η
) is 4.5 × 10
−5
, representing a 125-fold improvement in comparison to the previously proposed device exploiting the photosynthetic Z-scheme for electrical energy production.
Efficient Z-scheme inspired biophotovoltaics based on an anode with photosystem 2 integrated in a redox dye modified hydrogel in combination with a cathode with photosystem 1 integrated in an Os-complex modified hydrogel. |
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Bibliography: | 10.1039/c4cp00380b Electronic supplementary information (ESI) available. See DOI |
ISSN: | 1463-9076 1463-9084 |
DOI: | 10.1039/c4cp00380b |