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Issue 3, 2017
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Biomimetic electron transport via multiredox shuttles from photosystem II to a photoelectrochemical cell for solar water splitting

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Abstract

A bio-hybrid system integrating photosystem II (PSII) with artificial photocatalysts is considered as a platform to understand the solar-to-chemical energy conversion process. However, the electron transfer from PSII to artificial components remains inefficient, which hinders the favorable conversion performance. Herein, a CdS–PSII hybrid photoelectrochemical (PEC) cell is proposed for overall water splitting, where PSII and the CdS-based PEC cell are connected by an ordered multi-step electron transfer pathway comprising two redox shuttles quinone/hydroquinone and ferricyanide/ferrocyanide coupled by a graphite-based galvanic cell. The hybrid system allows overall water splitting with 8.5 μmol O2 h−1 and 17.7 μmol H2 h−1 under simulated solar light, corresponding to a solar-to-hydrogen efficiency of 0.34%. Moreover, the tandem light absorption from CdS to PSII both improves the light utilization efficiency and prolongs the lifetime of PSII. This work may inspire new approaches to achieve Z-scheme water splitting in the field of artificial photosynthesis.

Graphical abstract: Biomimetic electron transport via multiredox shuttles from photosystem II to a photoelectrochemical cell for solar water splitting

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Publication details

The article was received on 22 Nov 2016, accepted on 03 Jan 2017 and first published on 03 Jan 2017


Article type: Paper
DOI: 10.1039/C6EE03401B
Citation: Energy Environ. Sci., 2017,10, 765-771
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    Biomimetic electron transport via multiredox shuttles from photosystem II to a photoelectrochemical cell for solar water splitting

    Z. Li, W. Wang, C. Ding, Z. Wang, S. Liao and C. Li, Energy Environ. Sci., 2017, 10, 765
    DOI: 10.1039/C6EE03401B

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