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Copolymer of Phenylene and Thiophene toward a Visible‐Light‐Driven Photocatalytic Oxygen Reduction to Hydrogen Peroxide
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Copolymer of Phenylene and Thiophene toward a Visible‐Light‐Driven Photocatalytic Oxygen Reduction to Hydrogen Peroxide
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Journal Article
Copolymer of Phenylene and Thiophene toward a Visible‐Light‐Driven Photocatalytic Oxygen Reduction to Hydrogen Peroxide
2021
Overview
π‐Conjugated polymers including polythiophenes are emerging as promising electrode materials for (photo)electrochemical reactions, such as water reduction to H2 production and oxygen (O2) reduction to hydrogen peroxide (H2O2) production. In the current work, a copolymer of phenylene and thiophene is designed, where the phenylene ring lowers the highest occupied molecular orbital level of the polymer of visible‐light‐harvesting thiophene entities and works as a robust catalytic site for the O2 reduction to H2O2 production. The very high onset potential of the copolymer for O2 reduction (+1.53 V vs RHE, pH 12) allows a H2O2 production setup with a traditional water‐oxidation catalyst, manganese oxide (MnOx), as the anode. MnOx is deposited on one face of a conducting plate, and visible‐light illumination of the copolymer layer formed on the other face aids steady O2 reduction to H2O2 with no bias assistance and a complete photocatalytic conversion rate of 14 000 mg (H2O2) gphotocat−1 h−1 or ≈0.2 mg (H2O2) cm−2 h−1. Metal‐free copolymer of phenylene and thiophene (PPT) works as a visible‐light‐harvester and highly selective and robust catalyst for the oxygen reduction to hydrogen peroxide (H2O2). Visible‐light‐illuminated PPT layer in combination with a manganese oxide (MnOx) catalyst exhibits the steady H2O2 production without bias voltage at pH 12 and with a very high gravimetric photocatalytic conversion rate of 14 000 mg (H2O2) gphotocat−1.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc,Wiley
