Electron Density Optimization of Molybdenum Disulfide for Enhanced Photocatalytic Hydrogen Production Performance

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL Catalysis Letters Pub Date : 2024-09-11 DOI:10.1007/s10562-024-04816-6

Yijin Qin, Yan Li, Liang Wei, Meng Li, Hongxi Zhang, Jing Yang, Xiande Yang

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Abstract

The heterojunction construction through the effective combination of two metal sulfides can significantly improve the photocatalytic performance in the visible light region. In order to improve the photocatalytic efficiency of molybdenum disulfide (MoS₂), we synthesized a series of CdS/MoS₂ (CM) composites using a simple hydrothermal method. Their photocatalytic activities were evaluated by the photocatalytic hydrogen production. The results showed that the photocatalytic hydrogen production rate of CM composites was significantly enhanced after visible light irradiation, which was attributed to the improvement of visible light absorption capacity, efficient separation of photogenerated carriers, strong photocurrent response, and fast charge mobility. What’s more, sample CM-3 exhibited the highest photocatalytic hydrogen production efficiency of 2809.4 μmol g⁻¹ h⁻¹ compared to pure MoS₂ (0 μmol g⁻¹ h⁻¹) and CdS (81.5 μmol g⁻¹ h⁻¹). Therefore, the successful construction of heterojunction can accumulate much more photogenerated electrons for MoS₂, which is favorable to enhance its photocatalytic hydrogen production. This study provides strong evidence that heterojunction construction can obviously improve the photocatalytic activity.

Graphical Abstract

Photocatalytic H2 production of CM-3 composite. MoS2 constructed heterojunction with CdS can effectively improve the photocatalytic activity. The photocatalytic H2 production rate of CdS/MoS2 composite can reach 2809.4 μmol g-1 h-1

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优化二硫化钼的电子密度以提高光催化制氢性能

通过两种金属硫化物的有效结合构建异质结，可以显著提高可见光区域的光催化性能。为了提高二硫化钼（MoS2）的光催化效率，我们采用简单的水热法合成了一系列 CdS/MoS2 (CM) 复合材料。通过光催化制氢评估了它们的光催化活性。结果表明，在可见光照射下，CM 复合材料的光催化产氢率显著提高，这主要归因于可见光吸收能力的提高、光生载流子的高效分离、光电流响应强以及电荷迁移率快。此外，与纯 MoS2（0 μmol g-1 h-1）和 CdS（81.5 μmol g-1 h-1）相比，样品 CM-3 的光催化制氢效率最高，达到 2809.4 μmol g-1 h-1。因此，异质结的成功构建可以为 MoS2 积累更多的光生电子，有利于提高其光催化制氢能力。该研究有力地证明了异质结的构建可以明显提高光催化活性。

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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.