Investigating and optimizing the variation of selenium infused MoS2 as electrode material for supercapacitor applications

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL FlatChem Pub Date : 2024-05-27 DOI:10.1016/j.flatc.2024.100688

Pardeep Khichi , Priya Siwach , Latisha Gaba , Vijay Kumar , Jagdish Kumar , Anil Ohlan , Rahul Tripathi

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Abstract

Molybdenum disulfide (MoS₂) has been immensely explored for its potential usage in energy storage applications owing to its high theoretical specific capacitance and layered structure. Here, we have investigated the effect of selenium addition in MoS₂ forming MoS_2(1-_x₎Se₂_x alloys and studied their electrochemical performance. Selenization was performed through a simple hydrothermal method. The electrochemical performance of MoS₁Se₁ was evaluated in a two-electrode configuration. The selenization is found to improve the electrochemical performance of MoS₂ and the MoS₁Se₁ alloy with the optimal S (sulfur) to Se (selenium) ratio of 1:1 exhibits an excellent areal capacitance of 2629.45 mF/cm² at 1 mA/cm², with an appreciable specific capacitance of 266.51 F/g at a current density of 0.5 A/g and excellent cycle stability of 81.64 % after 6000 cycles. Along with the experimental findings, Density functional theory calculations were also performed, revealing that the electronic properties of MoSSe systems can be tuned by varying the ratio of S and Se.

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研究和优化超级电容器应用中作为电极材料的渗硒 MoS2 的变化

二硫化钼（MoS）因其高理论比电容和层状结构而被广泛应用于储能领域。在这里，我们研究了在 MoS 中添加硒形成 MoSSe 合金的效果，并研究了它们的电化学性能。硒化是通过简单的水热法进行的。在双电极配置中对 MoSSe 的电化学性能进行了评估。发现硒化改善了 MoS 的电化学性能，最佳 S（硫）与 Se（硒）比为 1:1 的 MoSSe 合金在 1 mA/cm 的电流密度下显示出 2629.45 mF/cm 的优异等面积电容，在 0.5 A/g 的电流密度下显示出 266.51 F/g 的显著比电容，并且在 6000 次循环后显示出 81.64 % 的优异循环稳定性。除了实验结果之外，我们还进行了密度泛函理论计算，结果表明可以通过改变 S 和 Se 的比例来调整 MoSSe 系统的电子特性。

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来源期刊

FlatChem Multiple-

CiteScore

8.40

自引率

6.50%

发文量

104

审稿时长

26 days

期刊介绍： FlatChem - Chemistry of Flat Materials, a new voice in the community, publishes original and significant, cutting-edge research related to the chemistry of graphene and related 2D & layered materials. The overall aim of the journal is to combine the chemistry and applications of these materials, where the submission of communications, full papers, and concepts should contain chemistry in a materials context, which can be both experimental and/or theoretical. In addition to original research articles, FlatChem also offers reviews, minireviews, highlights and perspectives on the future of this research area with the scientific leaders in fields related to Flat Materials. Topics of interest include, but are not limited to, the following: -Design, synthesis, applications and investigation of graphene, graphene related materials and other 2D & layered materials (for example Silicene, Germanene, Phosphorene, MXenes, Boron nitride, Transition metal dichalcogenides) -Characterization of these materials using all forms of spectroscopy and microscopy techniques -Chemical modification or functionalization and dispersion of these materials, as well as interactions with other materials -Exploring the surface chemistry of these materials for applications in: Sensors or detectors in electrochemical/Lab on a Chip devices, Composite materials, Membranes, Environment technology, Catalysis for energy storage and conversion (for example fuel cells, supercapacitors, batteries, hydrogen storage), Biomedical technology (drug delivery, biosensing, bioimaging)