Anthraquinone Redox Relay for Dye‐Sensitized Photo‐electrochemical H2O2 Production

Anthraquinone (AQ) redox mediators are introduced to metal‐free organic dye sensitized photo‐electrochemical cells (DSPECs) for the generation of H2O2. Instead of directly reducing O2 to produce H2O2, visible‐light‐driven AQ reduction occurs in the DSPEC and the following autooxidation with O2 allow...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2020-06, Vol.59 (27), p.10904-10908
Main Authors: Sun, Jiaonan, Wu, Yiying
Format: Article
Language:English
Subjects:
Anthraquinone
Anthraquinone dyes
Aqueous electrolytes
Dyes
dyes/pigments
Electrochemical cells
Electrochemistry
Electrolytes
Electrolytic cells
Hydrogen peroxide
oxygen
peroxides
photochemistry
Photoelectric effect
Photoelectric emission
Regeneration
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Summary:Anthraquinone (AQ) redox mediators are introduced to metal‐free organic dye sensitized photo‐electrochemical cells (DSPECs) for the generation of H2O2. Instead of directly reducing O2 to produce H2O2, visible‐light‐driven AQ reduction occurs in the DSPEC and the following autooxidation with O2 allows H2O2 accumulation and AQ regeneration. In an aqueous electrolyte, under 1 sun conditions, a water‐soluble AQ salt is employed with the highest photocurrent of up to 0.4 mA cm−2 and near‐quantitative faradaic efficiency for producing H2O2. In a non‐aqueous electrolyte, under 1 sun illumination, an organic‐soluble AQ is applied and the photocurrent reaches 1.8 mA cm−2 with faradaic efficiency up to 95 % for H2O2 production. This AQ‐relay DSPEC exhibits the highest photocurrent so far in non‐aqueous electrolytes for H2O2 production and excellent acid stability in aqueous electrolytes, thus providing a practical and efficient strategy for visible‐light‐driven H2O2 production. Dye hard: The dye‐sensitized photo‐electrochemical cell for visible‐light‐driven H2O2 production is enhanced by simply dissolving anthraquinone redox mediators in either aqueous or non‐aqueous electrolytes. Photo‐electrochemical tests reveal high photocurrent density, H2O2 conversion efficiency, and acid stability. Therefore, the use of anthraquinone presents a universal method for O2 reductive H2O2 production in most photo‐electrochemical systems.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202003745