Dual-functional electrocatalytic activity of MoS2 for hydrogen evolution and nitrate reduction reactions: coupling with mass spectroscopy

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2025-09-08 DOI:10.1016/j.jelechem.2025.119468

Fabio A. Gómez-Gómez, Eleazar Castañeda-Morales, Arturo Manzo-Robledo

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Abstract

A promising approach for hydrogen evolution reaction (HER) as energy source and nitrates reduction (NO₃_⁻-RR) towards control pollution and/or the generation of various nitrogenous added-value products is presented in this study. The investigation is focused on the electrocatalytic activity at acid conditions (0.5 M H₂SO₄ and 1.0 M HNO₃ solutions) of MoS₂ nanoflower-like morphology synthesized via hydrothermal route. The electrocatalytic characterization indicates that depending on the acid in turn, the overpotential for HER is altered. In this context, Tafel slopes and capacitance measurements give more insights on the interactions of MoS₂ catalyst in each acid. Whereas the charge-transfer resistance (ohms) was found to be R_HNO3 > R_H2SO4 as observed from galvanostatic-EIS experiments. Herein, DEMS results demonstrated that the reaction products are modulated by the acid nature, where hydrogen was observed as unique product in H₂SO₄; conversely, at HNO₃ electrolyte, the reduction of NO₃⁻ species was carried out leading to generation of N_2, N₂H₄ and NH₃, among other compounds, delaying HER-kinetic. Specialized techniques such XRD, SEM-EDS, RAMAN and XPS give some clues concerning the surface state of the materials in study.

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二硫化钼在析氢和硝酸还原反应中的双官能团电催化活性：与质谱的耦合

本研究提出了一种利用析氢反应（HER）作为能源和硝酸盐还原（NO3−-RR）来控制污染和/或产生各种含氮增值产品的有前途的方法。研究了水热法合成的二硫化钼纳米花在酸性条件下（0.5 M H2SO4和1.0 M HNO3溶液）的电催化活性。电催化表征表明，根据酸的不同，HER的过电位会发生改变。在这种情况下，Tafel斜率和电容测量可以更深入地了解MoS2催化剂在每种酸中的相互作用。而恒流电阻抗实验发现，电荷转移电阻（欧姆）为RHNO3 >； RH2SO4。其中，dms结果表明，反应产物受酸性质的调节，其中氢是H2SO4中唯一的产物；相反，在HNO3电解质下，NO3−的还原导致了N2、N2H4和NH3等化合物的生成，延迟了her -动力学。XRD、SEM-EDS、RAMAN和XPS等专业技术为研究材料的表面状态提供了线索。

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来源期刊

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.