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Electrochemically Synthesized Anthraquinone-Diphenylamine Polymer Photocatalyst for Enhanced Hydrogen Peroxide Production
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DOI：10.1002/asia.70753.png)
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Abstract
En 中文
The photochemical method is a promising approach for H2O2 production, requiring only sunlight and water. Electropolymerization and the use of the resulting electrode-supported DA polymers for photocatalytic H2O2 generation represent an attractive pathway for harvesting light energy. In this study, we synthesized the D-A polymer poly(2,6-bis(diphenylamino)anthraquinone) via two approaches: an electrochemical route (p-AQDPA/EP) and FeCl3-mediated chemical polymerization (p-AQDPA/CP). Both polymers show extended absorption up to 800 nm. The photocatalytic activity of p-AQDPA/EP and p-AQDPA/CP was examined towards H2O2 production. The p-AQDPA/EP efficiently reduces molecular oxygen and produces H2O2 in a neutral aqueous medium at a rate up to 6128 & micro;mol g-1 h-1 under light irradiation (lambda >= 400 nm) without any sacrificial agents. The p-AQDPA/EP photocatalyst demonstrated higher activity of H2O2 generation as compared to p-AQDPA/CP, attributed to its lower charge-transfer resistance (electrochemical impedance spectroscopy (EIS)), higher photocurrent, reduced photoluminescence intensity, and longer average lifetime relative to p-AQDPA/CP. These results indicate a higher concentration of surface charge carriers and more efficient charge transfer. The catalyst reduces oxygen through a direct two-electron oxygen reduction pathway. The metal catalyst-free synthesis of electropolymers offers a sustainable method to create polymeric photocatalysts for H2O2 production.
Keywords:
anthraquinone
donor-acceptor polymer
electrochemical polymerization
hydrogen peroxide
photochemical reaction
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