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

Abstract

Ab iohybrid photobioanode mimicking the Zscheme 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 ar ather negative water oxidation potential of about À0.55 Vv s. Ag/ AgCl, 1m KCl at neutral pH. The electrical linkage between both light-sensitive entities has been established through an Oscomplex-modified redox polymer (P Os ), whicha llows the formation of amulti-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.T he photobioanode was coupled to an ovel, transparent, inverseopal ATOc athode modified with an O 2 -reducing bilirubin oxidase for the construction of aH 2 O/O 2 photobioelectrochemical cell reaching ahigh open-circuit voltage of about 1V under illumination.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Semi-biological approaches to solar-to-chemical conversion

“…7e). 102,[119][120][121][122][123][124][125][126][127] This electrode architecture has interconnected macropores that provide a large surface area accessible by protein diffusion. The skeleton is made of a mesoporous structure consisting of (semi)conducting and hydrophilic nanoparticles (e.g., ITO or TiO 2 ) where proteins are adsorbed.…”

Membrane Protein Modified Electrodes in Bioelectrocatalysis

“…This was combined with an inverse opal antimony-doped tin oxide (ATO) cathode modified with bilirubin oxidase to catalyse oxygen reduction. This system achieved a high open-circuit voltage of about 1V under illumination (Figure 4a,b) [181].…”

Recent Progress in Applications of Enzymatic Bioelectrocatalysis

“…The electrons are then donated to substrates via enzymes and mediators, as shown in Figure 6. Photosensitizers such as TiO 2 [80,81,[160][161][162], PbS quantum dots [162], silver nanoclusters [80,81], and organic dyes [160,161] are incorporated in anodes of transparent electrode bases (ITO in general) with or without other catalysts. Particularly, in addition, the photosystem II (PSII) complex in the thylakoid membrane of cyanobacteria and higher plants is often used as a water-splitting anodic photo-bioelectrocatalyst [129,.…”