Photocatalytic Hydrogen Evolution Under Visible Light Using MoS2/g-C3N4 Nano-Photocatalysts

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL Catalysis Letters Pub Date : 2023-06-26 DOI:10.1007/s10562-023-04389-w

Zahra Moghimifar, Farshad Yazdani, Kourosh Tabar-Heydar, Meisam Sadeghi

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Abstract

Water splitting using solar light and an efficient photocatalyst is one of the new methods of hydrogen production that has attracted much attention today because of its importance in the energy crisis. Hence, a composite material containing molybdenum disulfide (MoS₂) and g-C₃N₄ was synthesized and used in the photocatalytic process. For this purpose, in the first instance, the photocatalytic activity of MoS₂/g-C₃N₄ was confirmed by the decolorization pathway of Rhodamine B (Rh B) under visible light irradiation. Then, MoS₂/g-C₃N₄ was carefully identified by SEM, XRD, PL, UV–Vis, EDS, and FT-IR analysis. Results of characteristic peaks and composite surface morphology confirm that the structural integrity of the primary photocatalyst sample was intact after combination with MoS₂ despite chemical interactions. The Brunner–Emmet–Teller (BET) surface area, total per valume, and average pore diameter of the sample are close to 15 m²g⁻¹, 0.07 cm³g⁻¹, and 19.5 nm, respectively. Then, the hydrogen production process under solar light was simulated using MoS₂/g-C₃N₄ photocatalyst and the Production rate was measured using a gas chromatography system (GC). In addition, the Eosin-Y dye solution is also used as a sensitizer to increase the photocatalyst activity under visible light. The g-C₃N₄/MoS₂-Triethanolamine (TEOA) mixture showed the best quantum efficiency when compared to all other sacrificial agents. Investigation of the factors affecting the catalyst activity showed that the parameters of exposure time, the concentration of photocatalyst, and triethanolamine (TEOA) percent used as a sacrificial agent affect water-splitting reaction efficiency. Further measurements showed that the highest hydrogen production rate of 1905 µmol g⁻¹ h⁻¹ is accessible. Accordingly, the g-C₃N₄ composite with MoS₂ can be a promising photocatalyst for high-efficiency water splitting. Besides, the photocatalytic mechanism is demonstrated to well-fit into the S-scheme pathway with apparent evidence.

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MoS2/g-C3N4纳米光催化剂在可见光下的光催化析氢

利用太阳光和高效光催化剂进行水分离是当今备受关注的制氢新方法之一，因为它在能源危机中具有重要意义。因此，我们合成了一种含有二硫化钼（MoS2）和 g-C3N4 的复合材料，并将其用于光催化过程。为此，首先通过可见光照射下罗丹明 B（Rh B）的脱色途径证实了 MoS2/g-C3N4 的光催化活性。然后，通过 SEM、XRD、PL、UV-Vis、EDS 和 FT-IR 分析对 MoS2/g-C3N4 进行了仔细鉴定。特征峰和复合表面形态的结果证实，尽管存在化学作用，但与 MoS2 结合后，原生光催化剂样品的结构完整性完好无损。样品的布鲁纳-艾美特-泰勒（BET）表面积、总体积和平均孔径分别接近 15 m2g-1、0.07 cm3g-1 和 19.5 nm。然后，使用 MoS2/g-C3N4 光催化剂模拟了太阳光下的制氢过程，并使用气相色谱仪（GC）测量了制氢率。此外，还使用了 Eosin-Y 染料溶液作为增敏剂，以提高光催化剂在可见光下的活性。与所有其他牺牲剂相比，g-C3N4/MoS2-三乙醇胺（TEOA）混合物的量子效率最高。对影响催化剂活性的因素进行的研究表明，曝光时间、光催化剂浓度和用作牺牲剂的三乙醇胺（TEOA）百分比等参数都会影响水分离反应的效率。进一步的测量表明，最高产氢率可达 1905 µmol g-1 h-1。因此，含有 MoS2 的 g-C3N4 复合材料有望成为高效率水分离的光催化剂。此外，光催化机理也被证明与 S 型途径十分吻合。

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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.