Phase-selective fabrication of Cu-based films by magnetic field-assisted sparking process for improved photocatalytic dye degradation and CO2 reduction

IF 5.7 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Surfaces and Interfaces Pub Date : 2024-11-06 DOI:10.1016/j.surfin.2024.105400

Winai Thongpan , Teera Butburee , Kasidid Yaemsunthorn , Niwat Jhuntama , Arisara Panthawan , Nidchamon Jumrus , Manikandan Maruthappan , Posak Tippo , Tewasin Kumpika , Ekkapong Kantarak , Wattikon Sroila , Pisith Singjai , Wiradej Thongsuwan

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Abstract

Copper-based films (Cu₂(OH)₃NO₃, Cu₂O, and CuO) were successfully synthesized using a sparking process under an external magnetic field, without requiring an annealing process. We thoroughly investigate the impact of magnetic field orientation on the structural, morphological, and optical properties of the films, along with their performance in photocatalytic degradation of methylene blue (MB) and carbon dioxide (CO₂) reduction. Field-emission scanning electron microscopy (FE-SEM) images reveal that the CuEB(S) sample displays secondary particles forming spherical, dense clusters, whereas the CuEB(N) sample exhibits larger, loosely packed clusters. In contrast, the cluster-like structures disperse in the CuEB(P) sample, resulting in a smoother film surface aligned with the parallel magnetic flux direction. Upon close observation, rice-shaped particles of varying sizes (26.3–60.3 nm) were found stacked together. This study presents a facile method to selectively fabricate films comprising single-phase Cu₂(OH)₃NO₃, a CuO/Cu₂O composite, or a combination of all phases by manipulating the external magnetic field orientation during the sparking process. All synthesized materials exhibit photocatalytic activity, with the heterojunction composed of CuO, Cu₂O, and Cu₂(OH)₃NO₃ demonstrating superior performance. This heterostructure achieved up to a 180 % enhancement in MB degradation and approximately doubled the CO₂-to-CO conversion rate to 16.09 μmol g^–¹ h^–¹ compared to the sample prepared without a magnetic field.

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利用磁场辅助火花工艺相位选择性制造铜基薄膜，改善光催化染料降解和二氧化碳还原能力

在外加磁场下，利用火花工艺成功合成了铜基薄膜（Cu2(OH)3NO3、Cu2O 和 CuO），无需退火过程。我们深入研究了磁场取向对薄膜结构、形态和光学特性的影响，以及它们在光催化降解亚甲基蓝（MB）和还原二氧化碳（CO2）方面的性能。场发射扫描电子显微镜（FE-SEM）图像显示，CuEB(S) 样品显示出形成球形致密团簇的次生颗粒，而 CuEB(N) 样品则显示出较大的松散团簇。相比之下，CuEB(P) 样品中的簇状结构较为分散，导致与平行磁通方向对齐的薄膜表面更为光滑。经过仔细观察，发现大小不一（26.3-60.3 nm）的米粒状颗粒堆叠在一起。本研究提出了一种简便的方法，通过在火花过程中操纵外部磁场方向，选择性地制造由单相 Cu2(OH)3NO3、CuO/Cu2O 复合材料或所有相组合而成的薄膜。所有合成材料都具有光催化活性，其中由 CuO、Cu2O 和 Cu2(OH)3NO3 组成的异质结性能更优。与无磁场制备的样品相比，这种异质结构的甲基溴降解率提高了 180%，CO2-CO 转化率提高了约一倍，达到 16.09 μmol g-¹ h-¹。

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来源期刊

Surfaces and Interfaces Chemistry-General Chemistry

CiteScore

8.50

自引率

6.50%

发文量

753

审稿时长

35 days

期刊介绍： The aim of the journal is to provide a respectful outlet for ''sound science'' papers in all research areas on surfaces and interfaces. We define sound science papers as papers that describe new and well-executed research, but that do not necessarily provide brand new insights or are merely a description of research results. Surfaces and Interfaces publishes research papers in all fields of surface science which may not always find the right home on first submission to our Elsevier sister journals (Applied Surface, Surface and Coatings Technology, Thin Solid Films)