Preparation and Electrochemical Properties of Nitrogen-Doped MXenes Porous Hydrogen Evolution Cathode Materials by Molten Salt Method

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2025-05-13 DOI:10.1007/s10562-025-05040-6

Jinjing Du, Yu Zhou, Xinxin Cui, Yuxiang Yangxuan, Qian Li, Xiao Feng, Jun Zhu, Heng Zuo

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Abstract

In the domain of hydrogen evolution reaction (HER) cathode catalysts, MXenes-containing materials are considered to possess considerable potential owing to their unique two-dimensional layered architecture. Conversely, the production processes of these materials, together with the selection of diverse nitrogen doping strategies and the underlying mechanisms, remain subjects requiring further investigation. This experiment employed the molten salt method for the synthesis of MXenes. This approach is beneficial as it effectively mitigates the influence of fluorine groups on the electrochemical characteristics of MXenes. A study was conducted on the effects of doping with two distinct nitrogen sources: urea and lithium nitride. The microstructures and electrochemical characteristics were analyzed to ascertain the most effective preparation and nitrogen doping methods. The Ti₃AlC₂ precursor was specifically etched with CoCl₂ in a eutectic salt solution of KCl and LiCl to produce Ti₃C₂. Subsequently, lithium nitride was selected as the nitrogen source, resulting in the synthesis of MXenes with enhanced hydrogen evolution reaction performance. The studied HER cathode material exhibited a distinctly defined layered structure with significantly increased interlayer gap. This led to an increased surface area and a higher density of active sites. The electrochemical test findings indicated an overpotential of 82 millivolts at a current density of 10 milliamperes per square centimeter, with a Tafel slope of 120.4 millivolts per degree. The electrochemical impedance spectroscopy (EIS) analysis revealed that the series resistance (Rs) is 1.571 Ω, indicating a low value. The charge transfer resistance (Rct) was measured at 78.56 Ω, corroborating the superior performance. The material exhibited exceptional stability throughout the testing phase.

Graphical Abstract

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熔盐法制备氮掺杂MXenes多孔析氢阴极材料及其电化学性能

在析氢反应（HER）阴极催化剂领域，含mxenes材料由于其独特的二维层状结构被认为具有相当大的潜力。相反，这些材料的生产过程，以及不同氮掺杂策略的选择和潜在机制，仍然需要进一步研究。本实验采用熔盐法合成MXenes。这种方法是有益的，因为它有效地减轻了氟基团对MXenes电化学特性的影响。研究了尿素和氮化锂两种不同氮源的掺杂效果。通过对其微观结构和电化学特性的分析，确定了最有效的制备方法和氮掺杂方法。用CoCl2在KCl和LiCl共晶盐溶液中蚀刻Ti3AlC2前驱体，生成Ti3C2。随后，选择氮化锂作为氮源，合成了析氢反应性能增强的MXenes。所研究的HER正极材料呈现出明显的层状结构，层间间隙显著增加。这导致了表面积的增加和活性位点的密度的增加。电化学测试结果表明，在电流密度为10毫安/平方厘米时，过电位为82毫伏，塔菲尔斜率为120.4毫伏/度。电化学阻抗谱（EIS）分析显示，串联电阻（Rs）为1.571 Ω，值较低。电荷转移电阻（Rct）为78.56 Ω，证实了其优越的性能。该材料在整个测试阶段表现出优异的稳定性。图形抽象

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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.