The Construction of Type II Cu2O/ZnFe2O4 Heterojunction Promoted the Photocatalytic Hydrogen Production Activity

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2024-09-15 DOI:10.1007/s10562-024-04830-8

Kai Wang, Qing Chen, Haiyan Xie, Miao Wang, Xu Kong, Kaiyuan Cheng, Zhiliang Jin

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Abstract

Photocatalytic hydrogen production by semiconductors is an optimal path to achieve solar energy conversion. In this work, Cu₂O/ZnFe₂O₄ type II heterostructure is composed of ZnFe₂O₄ nanoparticles loaded on the surface of Cu₂O microspheres, the photocatalytic hydrogen evolution performance is studied. Under the irradiation 5 h of 5 w LED lamp, the hydrogen production of Cu₂O/ZnFe₂O₄ composites was 30.8 and 12.7 times higher than pure Cu₂O and pure ZnFe₂O₄, respectively. In addition, after four cycles of experiments for 20 h, the hydrogen production is still maintained at 67.4% of the initial activity, indicating the relatively stable hydrogen evolution activity of the composite material. The electron transfer mechanism of the photocatalyst was confirmed through the utilization of density functional theory (DFT) and in-situ irradiation X-ray photoelectron spectroscopy. The effective interfacial contact between Cu₂O and ZnFe₂O₄ nanoparticles forms a type II heterojunction, which makes the effective separation of photogenerated charges, facilitates the reduction of protons to H₂, and achieves efficient hydrogen production. This work presents a strategy for simple design and fabrication of highly efficient composite photocatalysts.

Graphical Abstract

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构建 II 型 Cu2O/ZnFe2O4 异质结提高光催化制氢活性

半导体光催化制氢是实现太阳能转化的最佳途径。本研究将 ZnFe2O4 纳米颗粒负载在 Cu2O 微球表面，组成 Cu2O/ZnFe2O4 II 型异质结构，研究其光催化氢气进化性能。在 5 w LED 灯照射 5 小时后，Cu2O/ZnFe2O4 复合材料的产氢量分别是纯 Cu2O 和纯 ZnFe2O4 的 30.8 倍和 12.7 倍。此外，经过四个循环 20 h 的实验后，产氢量仍保持在初始活性的 67.4%，表明复合材料的氢进化活性相对稳定。利用密度泛函理论（DFT）和原位辐照 X 射线光电子能谱证实了光催化剂的电子传递机理。Cu2O 与 ZnFe2O4 纳米粒子之间的有效界面接触形成了 II 型异质结，从而有效分离了光生电荷，促进了质子还原为 H2，实现了高效制氢。这项工作提出了一种简单设计和制造高效复合光催化剂的策略。

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.