Fig. 1 | Nature Communications

Fig. 1

From: Light-induced formation of partially reduced oxygen species limits the lifetime of photosystem 1-based biocathodes

Fig. 1

Overview of the charge transfer pathway in the PS1/Os-complex-modified redox polymer-based photocathode. a Schematic representation of the PS1 photocathode. The redox polymer acts simultaneously as immobilization matrix and as a mediator for the reduction of the photo-oxidized P700+ site at PS1. MV2+ is used as electron scavenger in solution for the uptake of electrons from the reduced Fe-S cluster FB− at the stromal side of PS1. The efficient reduction of O2 in solution by the generated MV+• allows fast regeneration of MV2+ in solution with the concomitant generation of superoxide radicals. (P700*: photo-excited P700 special chlorophyll pair). b Energy levels for the terminal cofactors involved in the electron-transfer sequence of PS1 and formal potentials of the Os-complex-modified polymer (Os-P), methyl viologen, and the O2/O2•− couple at pH 7.0 (25 °C)

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