Hydrothermally Synthesized Transition Metal Oxide-MoS2 Composite for Efficient Hydrogen Evolution Reaction

IF 2 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

ChemistrySelect Pub Date : 2025-06-05 DOI:10.1002/slct.202502877

A. Dhariwal, D. Banerjee, N. Sen, N. S. Das, K. K Chattopadhyay

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Abstract

Manganese, cobalt oxide-based molybdenum disulphide (Mn-Co-MoS₂) composite was synthesized via hydrothermal method and its potential towards hydrogen evolution reaction (HER) performance was evaluated. Structural and morphological studies confirmed successful Mn and Co incorporation, enhancing electro-catalytic properties of the sample. X-ray diffraction validated phase formation, while field-emission scanning microscopy revealed changes in morphologies in pristine MoS₂ and the composite. X-ray photoelectron spectroscopy revealed that the oxidation states of constituent elements in the composite. Electrochemical studies demonstrated efficient HER activity of Mn-Co-MoS₂, superior compared to pristine MoS₂. Linear sweep voltammetry showed higher current density and improved catalytic efficiency. The composite exhibited a lower Tafel slope (243 mV/decade) than pristine MoS₂ (638 mV/decade), indicating enhanced reaction kinetics following a Volmer-Heyrovsky mechanism. Electrochemical impedance spectroscopy was performed to evaluate the charge transfer resistance of the samples. Electrochemically active surface areas of both the samples were evaluated by means of cyclic voltammetry analysis. The study highlights the potential of the composite as a promising electrocatalyst for HER, offering a favorable balance of catalytic activity, process simplicity, and cost-effectiveness.

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水热合成过渡金属氧化物-二硫化钼复合材料的高效析氢反应

采用水热法制备了锰钴氧化物基二硫化钼（Mn-Co-MoS2）复合材料，并对其析氢性能进行了评价。结构和形态研究证实了锰和钴的成功结合，增强了样品的电催化性能。x射线衍射证实了相的形成，而场发射扫描显微镜显示了原始二硫化钼和复合材料的形态变化。x射线光电子能谱揭示了复合材料中组成元素的氧化态。电化学研究表明Mn-Co-MoS2具有高效的HER活性，优于原始的MoS2。线性扫描伏安法显示了更高的电流密度和催化效率。复合材料的Tafel斜率（243 mV/decade）低于原始MoS2 (638 mV/decade)，表明其反应动力学遵循Volmer-Heyrovsky机制。采用电化学阻抗谱法测定样品的电荷转移电阻。用循环伏安法测定了两种样品的电化学活性表面积。该研究强调了复合材料作为HER电催化剂的潜力，提供了催化活性、工艺简单性和成本效益的良好平衡。

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来源期刊

ChemistrySelect Chemistry-General Chemistry

CiteScore

3.30

自引率

4.80%

发文量

1809

审稿时长

1.6 months

期刊介绍： ChemistrySelect is the latest journal from ChemPubSoc Europe and Wiley-VCH. It offers researchers a quality society-owned journal in which to publish their work in all areas of chemistry. Manuscripts are evaluated by active researchers to ensure they add meaningfully to the scientific literature, and those accepted are processed quickly to ensure rapid online publication.