A Z‐Scheme‐Inspired Photobioelectrochemical H₂O/O₂ Cell with a 1 V Open‐Circuit Voltage Combining Photosystem II and PbS Quantum Dots

Abstract

Abstract A biohybrid photobioanode mimicking the Z‐scheme has been developed by functional integration of photosystem II (PSII) and PbS quantum dots (QDs) within an inverse opal TiO 2 architecture giving rise to a rather negative water oxidation potential of about −0.55 V vs. Ag/AgCl, 1 m KCl at neutral pH. The electrical linkage between both light‐sensitive entities has been established through an Os‐complex‐modified redox polymer (P Os ), which allows the formation of a multi‐step electron‐transfer chain under illumination starting with the photo‐activated water oxidation at PSII followed by an electron transfer from PSII through P Os to the photo‐excited QDs and finally to the TiO 2 electrode. The photobioanode was coupled to a novel, transparent, inverse‐opal ATO cathode modified with an O 2 ‐reducing bilirubin oxidase for the construction of a H 2 O/O 2 photobioelectrochemical cell reaching a high open‐circuit voltage of about 1 V under illumination.

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Identifiers

DOI

10.1002/ange.201811172

Journal

Angewandte Chemie

Year

2018