B. van den Bosch
- Photosystem I-based Biophotovoltaics on Nanostructured Hematite
- Advanced Functional Materials
- Volume | Issue number
- 24 | 47
- Pages (from-to)
- Document type
- Faculty of Science (FNWI)
- Van 't Hoff Institute for Molecular Sciences (HIMS)
The electronic coupling between a robust red algal photosystem I (PSI) associated with its light harvesting antenna (LHCI) and nanocrystalline n-type semiconductors, TiO2 and hematite (α-Fe2O3) is utilized for fabrication of the biohybrid dye-sensitized solar cells (DSSC). PSI-LHCI is immobilized as a structured multilayer over both semiconductors organized as highly ordered nanocrystalline arrays, as evidenced by FE-SEM and XRD spectroscopy. Of all the biohybrid DSSCs examined, α-Fe2O3/PSI-LHCI biophotoanode operates at a highest quantum efficiency and generates the largest open circuit photo-current compared to the tandem system based on TiO2/PSI-LHCI material. This is accomplished by immobilization of the PSI-LHCI complex with its reducing side towards the hematite surface and nanostructuring of the PSI-LHCI multilayer in which the subsequent layers of this complex are organized in the head-to-tail orientation. The biohybrid PSI-LHCI-DSSC is capable of sustained photoelectrochemical H2 production upon illumination with visible light above 590 nm. Although the solar conversion efficiency of the PSI-LHCI/hematite DSSC is currently below a practical use, the system provides a blueprint for a genuinely green solar cell that can be used for molecular hydrogen production at a rate of 744 μmoles H2 mg Chl-1 h-1, placing it amongst the best performing biohybrid solar-to-fuel nanodevices.
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