Publication date: 8th October 2020
Biohybrid systems assembled from photosynthetic elements interfaced with electrode materials are envisioned as promising alternatives for light energy conversion. In analogy to the working principle of dye sensitized solar cells, the central feature of biohybrid cells is the light harvesting component needed for generation of the high-energy electrons. The main challenges for achieving efficient energy conversion reside in the wiring of the photosynthetic materials. This lecture focusses on electrochemical tools to study the electron delivery and collection from photosystems immobilized in thin films on electrode surface. Methods for quantification of the various steps of the electron transfer chain will be presented. The impact of the composition and geometry of the photoelectrocataytic film will be discussed with respect to both energy conversion efficiency and electron transfer mechanism. Importantly, charge recombination at the electrode or within the photosynthetic film, a process that decreases the energy conversion efficiency, will be delineated. Further development of electroanalytical methods and their combination with spectroscopic tools will help to gain the necessary information for rational design and optimization of the light-induced electron transfer chain in biohybrid photosynthetic systems.
Funding: Financial support by the ERC starting grant 715900 is gratefully acknowledged.
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