Dual Z-scheme black phosphorus quantum dots (BPQDs)/ Cu2O crystalline/amorphous Ti, Fe-layered double hydroxides (LDH) heterojunction construction with enhanced electron transfer property for photocatalytic nitrogen fixation

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-03-31 DOI:10.1016/j.jallcom.2025.180135

Wanquan Ma , Yuan Yu , Yanning Qu , Dongfeng Sun , Huayun Du , Lei Zhang , Linyin Huang , Shihu Lei , Qingmei Su , Beibei Lou , Min Zhang , Xinyue Wei , Bingshe Xu

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引用次数: 0

Abstract

Photocatalytic nitrogen (N₂) reduction efficiency of the catalysts can be enhanced through Z-scheme heterojunctions. However, challenges related to electron transfer efficiency and interactions within these systems remained to be addressed. In this study, a dual Z-scheme heterojunction composed of black phosphorus quantum dot (BPQDs)/Cu₂O crystalline/amorphous Ti, Fe-layered double hydroxides (LDH) heterojunction (BPCTF) was successfully synthesized for photocatalytic N₂ reduction. The dual Z-scheme heterojunction significantly enhanced charge separation efficiency, and the crystalline/amorphous structure broadened electron transport pathways, thereby enhancing photocatalytic activity. The synthesized BPCTF catalyst achieved a photocatalytic N₂ reduction rate of 47.316 µ mol/g/h, corresponding to 5.12-, 2.14-, and 1.16-fold enhancements compared to Cu₂O, Ti, Fe-LDH, and Cu₂O/Ti, Fe-LDH, respectively. This work advanced the mechanistic understanding of dual Z-scheme photocatalysts by elucidating synergistic contributions from free radical dynamics and intrinsic electric fields, providing valuable insights into the electron transfer processes for photocatalytic N₂ reduction.

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用于光催化固氮的双 Z 型黑磷量子点 (BPQDs) / Cu2O 晶体/非晶态 Ti、Fe 层状双氢氧化物 (LDH) 异质结结构具有更强的电子传递性能

催化剂的光催化氮（N2）还原效率可通过 Z 型异质结得到提高。然而，与这些系统内的电子传递效率和相互作用有关的挑战仍有待解决。本研究成功合成了由黑磷量子点（BPQDs）/Cu2O 晶体/非晶态 Ti、Fe 层状双氢氧化物（LDH）异质结（BPCTF）组成的双 Z 型异质结，用于光催化还原 N2。双 Z 型异质结显著提高了电荷分离效率，结晶/非晶结构拓宽了电子传输途径，从而提高了光催化活性。合成的 BPCTF 催化剂实现了 47.316 µ mol/g/h 的光催化 N2 还原速率，与 Cu2O、Ti、Fe-LDH 和 Cu2O/Ti、Fe-LDH 相比分别提高了 5.12、2.14 和 1.16 倍。这项工作通过阐明自由基动力学和固有电场的协同贡献，推进了对双 Z 型光催化剂的机理认识，为光催化还原 N2 的电子传递过程提供了宝贵的见解。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.