Scalable Fabrication of Biophotoelectrodes by Means of Automated Airbrush Spray-Coating

Bobrowski, T. and Conzuelo, F. and Ruff, A. and Hartmann, V. and Frank, A. and Erichsen, T. and Nowaczyk, M.M. and Schuhmann, W.

Volume: 85 Pages: 1396-1400
DOI: 10.1002/cplu.202000291
Published: 2020

The fabrication and electrochemical evaluation of transparent photoelectrodes consisting of Photosystem I (PSI) or Photosystem II (PSII) is described, which are embedded and electrically wired by a redox polymer. The fabrication process is performed by an automated airbrush-type spray coating system, which ensures controlled and scalable electrode preparation. As proof of concept, electrodes with a surface area of up to 25 cm2 were prepared. The macro-porous structure of the indium tin oxide electrodes allows a high loading of the photoactive protein complexes leading to enhanced photocurrents, which are essential for potentially technologically relevant solar-powered devices. In addition, we show that unpurified crude PSII extracts, which can be provided in comparatively high yields for electrode modification, are suitable for photoelectrode fabrication with comparable photocurrent densities. © 2020 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

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