Constructing Covalent Triazine Frameworks/N-Doped Carbon-Coated Cu2O S-Scheme Heterojunctions for Boosting Photocatalytic Hydrogen Production

IF 10.8 2区化学 Q1 CHEMISTRY, PHYSICAL

物理化学学报 Pub Date : 2024-12-01 DOI:10.3866/PKU.WHXB202407020

Kaihui Huang , Dejun Chen , Xin Zhang , Rongchen Shen , Peng Zhang , Difa Xu , Xin Li

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Abstract

The development of efficient photocatalysts for hydrogen production is crucial in sustainable energy research. In this study, we designed and prepared a Covalent Triazine Framework (CTF)-Cu₂O@NC composite featuring an S-scheme heterojunction structure aimed at enhancing the photocatalytic hydrogen production. The light absorption capacity, electron-hole separation efficiency and H₂-evolution activity of the composite were significantly enhanced due to the synergistic effects of the nitrogen-doped carbon (NC) layer and the S-scheme heterojunction. Structural and photoelectrochemical characterization of the system reveal that the S-scheme heterojunctions not only enhance the separation efficiency of photogenerated carriers but also maintain the strong redox capabilities to further promote the photocatalytic reactions. Moreover, the NC layer could simultaneously reduce the photocorrosion of Cu₂O and promote the electron transfer. Experimental results demonstrate that the CTF-7% Cu₂O@NC composite shows outstanding hydrogen-production performance under visible light, achieving 15645 μmol∙g⁻¹∙h⁻¹, significantly surpassing the photocatalytic activity of pure CTF (2673 μmol∙g⁻¹∙h⁻¹). This study introduces a novel approach to the development of efficient and innovative photocatalytic materials, strongly supporting the advancement of sustainable hydrogen energy.

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构建共价三嗪框架/ n掺杂碳包覆Cu2O s方案异质结促进光催化制氢

开发高效的光催化剂用于制氢是可持续能源研究的关键。在本研究中，我们设计并制备了一种具有s型异质结结构的共价三嗪框架(CTF)-Cu2O@NC复合材料，旨在增强光催化制氢。由于氮掺杂碳（NC）层与s -图式异质结的协同作用，复合材料的光吸收能力、电子-空穴分离效率和h2 -析出活性显著增强。系统的结构和光电化学表征表明，s型异质结不仅提高了光生载体的分离效率，而且保持了较强的氧化还原能力，进一步促进了光催化反应。此外，NC层可以同时减少Cu2O的光腐蚀和促进电子转移。实验结果表明，CTF-7% Cu2O@NC复合材料在可见光下的产氢性能优异，达到15645 μmol∙g−1∙h−1，明显超过纯CTF的2673 μmol∙g−1∙h−1。本研究为高效创新光催化材料的开发提供了一条新途径，有力地支持了可持续氢能的发展。下载：下载高分辨率图片（131KB）下载：下载全尺寸图片

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