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    Rational Design of a Photosystem I Photoanode for the Fabrication of Biophotovoltaic Devices

    Year: 2021

    Journal: Adv. Energy Mater., Volume 11, DEC

    Authors: Wang, Panpan; Zhao, Fangyuan; Frank, Anna; Zerria, Sarra; Lielpetere, Anna; Ruff, Adrian; Nowaczyk, Marc M.; Schuhmann, Wolfgang; Conzuelo, Felipe

    Organizations: Deutsche Forschungsgemeinschaft (DFG) [390677874]; European Union [813006]; China Scholarship Council (CSC); Research Training Group 2341 MiCon (Microbial Substrate Conversion); Projekt DEAL

    Keywords: biophotovoltaics; electrode materials; gas-diffusion electrodes; Langmuir-Blodgett films; photosystem I; redox polymers

    Photosystem I (PSI), a robust and abundant biomolecule capable of delivering high-energy photoelectrons, has a great potential for the fabrication of light-driven semi-artificial bioelectrodes. Although possibilities have been explored in this regard, the true capabilities of this technology have not been achieved yet, particularly for their use as bioanodes. Here, the use of PSI Langmuir monolayers and their electrical wiring with specifically designed redox polymers is shown, ensuring an efficient mediated electron transfer as the basis for the fabrication of an advanced biophotoanode. The bioelectrode is rationally implemented and optimized for enabling the generation of substantial photocurrents of up to 17.6 mu A cm(-2) and is even capable of delivering photocurrents at potentials as low as -300 mV vs standard hydrogen electrode, surpassing the performance of comparable devices. To highlight the applicability of the developed light-driven bioanode, a biophotovoltaic cell is assembled in combination with a gas-breathing biocathode. The assembly operates in a single compartment cell and delivers considerable power outputs at large cell voltages. The implemented biophotoanode constitutes an important step toward the development of advanced biophotovoltaic devices.
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