Keto-anthraquinone covalent organic framework for H2O2 photosynthesis with oxygen and alkaline water

Xiangcheng Zhang, Silian Cheng, Chao Chen, Xue Wen, Jie Miao, Baoxue Zhou, Mingce Long () and Lizhi Zhang ()
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Xiangcheng Zhang: Shanghai Jiao Tong University
Silian Cheng: Shanghai Jiao Tong University
Chao Chen: East China Normal University
Xue Wen: Shanghai Jiao Tong University
Jie Miao: Shanghai Jiao Tong University
Baoxue Zhou: Shanghai Jiao Tong University
Mingce Long: Shanghai Jiao Tong University
Lizhi Zhang: Shanghai Jiao Tong University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Hydrogen peroxide photosynthesis suffers from insufficient catalytic activity due to the high energy barrier of hydrogen extraction from H2O. Herein, we report that mechanochemically synthesized keto-form anthraquinone covalent organic framework which is able to directly synthesize H2O2 (4784 μmol h−1 g−1 at λ > 400 nm) from oxygen and alkaline water (pH = 13) in the absence of any sacrificial reagents. The strong alkalinity resulted in the formation of OH-(H2O)n clusters in water, which were adsorbed on keto moieties within the framework and then dissociated into O2 and active hydrogen, because the energy barrier of hydrogen extraction was largely lowered. The produced hydrogen reacted with anthraquinone to generate anthrahydroquinone, which was subsequently oxidized by O2 to produce H2O2. This study ultimately sheds light on the importance of hydrogen extraction from H2O for H2O2 photosynthesis and demonstrates that H2O2 synthesis is achievable under alkaline conditions.

Date: 2024
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DOI: 10.1038/s41467-024-47023-y

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