Visible-light-driven CdS heterojunction photocatalysts of the MB degradation and water splitting

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Optical Materials Pub Date : 2025-03-12 DOI:10.1016/j.optmat.2025.116925

Marwah J. Kadhim , M.A. Mahdi , Atyaf M. Abdul Muttalib , N.A. Abdullah , Ali R. Naser , Zahraa H. Harz

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Abstract

Chemical bath deposition (CBD) is used to prepare Cadmium Sulfide (CdS) nanocrystalline thin films on glass and FTO/glass substrates. The CdS/Au nanocrystalline thin films were prepare by casting a solution of Au nanoparticles made using pulsed laser ablation technique. The successive ionic layer adsorption and reaction (SILAR) approach was used to create SnS thin films on CdS thin films, resulting in CdS/SnS heterojunction nanocrystalline thin films. The optical properties of prepared samples indicated that the optical band gap of the CdS and CdS/SnS nanocrystalline thin films created on a glass substrate is 2.34 and 1.51 eV, respectively. The optical band gaps of the CdS, CdS/Au, and CdS/SnS nanocrystalline thin films formed onto FTO/glass substrates are predicted to be 2.36, 2.29, and 2.19 eV, respectively. The photocatalytic activity of the synthesized CdS and CdS/Au nanocrystalline thin films was tested against the methylene blue (MB) dye under visible light irradiation. The photodegradation rate of the MB dye rose as the irradiation period increased. After 240 min of exposure, the photodegradation rate of MB dye was 76 % and 96 % for CdS and CdS/SnS nanocrystalline thin films, respectively. The linear sweep voltammetry (J-V) of CdS, CdS/Au, and CdS/SnS nanocrystalline thin films on FTO/glass substrates demonstrated a strong sensitivity to visible light. The Niqyst measurements of the CdS/SnS nanocrystalline thin film electrode have the smallest semicircle when compared to the CdS and CdS/Au thin films.

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可见光驱动的 CdS 异质结光催化剂的甲基溴降解和水分离功能

采用化学浴沉积法（CBD）在玻璃和FTO/玻璃衬底上制备硫化镉（CdS）纳米晶薄膜。采用脉冲激光烧蚀法制备了金纳米粒子溶液，浇铸了CdS/Au纳米晶薄膜。采用连续离子层吸附反应（SILAR）方法在CdS薄膜上制备了SnS薄膜，得到了CdS/SnS异质结纳米晶薄膜。制备样品的光学性质表明，在玻璃衬底上制备的CdS和CdS/SnS纳米晶薄膜的光学带隙分别为2.34和1.51 eV。在FTO/玻璃基板上形成的CdS、CdS/Au和CdS/SnS纳米晶薄膜的光学带隙分别为2.36、2.29和2.19 eV。在可见光下测试了合成的CdS和CdS/Au纳米晶薄膜对亚甲基蓝（MB）染料的光催化活性。随着辐照时间的延长，MB染料的光降解率呈上升趋势。曝光240 min后，CdS和CdS/SnS纳米晶薄膜对MB染料的光降解率分别为76%和96%。FTO/玻璃基板上CdS、CdS/Au和CdS/SnS纳米晶薄膜的线性扫描伏安（J-V）分析表明，CdS/Au纳米晶薄膜对可见光具有较强的灵敏度。与CdS和CdS/Au薄膜相比，Niqyst测量的CdS/SnS纳米晶薄膜电极具有最小的半圆。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.