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Anthraquinone Redox Relay for Dye‐Sensitized Photo‐electrochemical H 2 O 2 Production
Anthraquinone (AQ) redox mediators are introduced to metal‐free organic dye sensitized photo‐electrochemical cells (DSPECs) for the generation of H 2 O 2 . Instead of directly reducing O 2 to produce H 2 O 2 , visible‐light‐driven AQ reduction occurs in the DSPEC and the following autooxidation with...
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| Published in: | Angewandte Chemie 2020-06, Vol.132 (27), p.10996-11000 |
|---|---|
| Main Authors: | , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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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 H
2
O
2
. Instead of directly reducing O
2
to produce H
2
O
2
, visible‐light‐driven AQ reduction occurs in the DSPEC and the following autooxidation with O
2
allows H
2
O
2
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 H
2
O
2
. 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 H
2
O
2
production. This AQ‐relay DSPEC exhibits the highest photocurrent so far in non‐aqueous electrolytes for H
2
O
2
production and excellent acid stability in aqueous electrolytes, thus providing a practical and efficient strategy for visible‐light‐driven H
2
O
2
production. |
|---|---|
| ISSN: | 0044-8249 1521-3757 |
| DOI: | 10.1002/ange.202003745 |