AuCu双金属合金修饰共价有机框架用于高效光催化析氢

doi:10.3866/PKU.WHXB202312014

Abstract

Abstract:

Covalent organic frameworks (COFs) represent a kind of novel crystalline porous organic substances with extended π-conjugation framework and tunable structures, which display great promise in photocatalysis. However, unadorned COFs suffer from sluggish reaction kinetics, and a cocatalyst is essentially needed to reduce the activation barrier toward specific surface reaction and accelerate reaction kinetics. In this work, bimetallic alloys serving as co-catalysts were decorated on COFs to enhance the photocatalytic hydrogen evolution performance. By precisely-tuning the ratio of AuCu alloy, the resultant Au₁Cu₅/COF-TpPa displays the highest photocatalytic hydrogen generation rate (8.24 mmol∙g⁻¹∙h⁻¹), even surpassing the Pt modified COF-TpPa (6.51 mmol∙h⁻¹∙g⁻¹). According to the systematic characterizations and theoretical calculation, Au₁Cu₅/COF-TpPa exhibits the significantly enhanced charge carrier separation efficiency and reduced H* formation energy barrier, thus possessing high photocatalytic performance. This work affords a valuable approach to advancing COF-based photocatalysts by employing bimetallic alloy cocatalysts.

Key words: Photocatalysis, H₂ generation, Covalent organic framework, Bimetallic cocatalyst

Wenxiu Yang, Jinfeng Zhang, Quanlong Xu, Yun Yang, Lijie Zhang. Bimetallic AuCu Alloy Decorated Covalent Organic Frameworks for Efficient Photocatalytic Hydrogen Production[J]. Acta Phys. -Chim. Sin. 2024, 40(10), 2312014. doi: 10.3866/PKU.WHXB202312014

Figures/Tables 6

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References 66

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Bimetallic AuCu Alloy Decorated Covalent Organic Frameworks for Efficient Photocatalytic Hydrogen Production

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