Theoretical Specific Capacity Research Articles

A Sustainable and Cost-Effective Nitrogen-Doped Three-Dimensional Porous Carbon for High-Performance Lithium-Sulfur Batteries.

Affordable clean energy is one of the major sustainable development goals that can transform our world. At present, researchers are working to develop cheap electrode materials to develop energy storage devices, the Lithium-sulfur (Li-S) battery is considered a promising energy storage device owing to its excellent theoretical specific capacity and energy density. Herein, utilizing the ramie degumming waste liquid as raw materials, after freeze-drying and high-temperature calcination, a sustainable and cost-effective three-dimensional (3D) porous nitrogen-doped ramie carbon (N-RC) was synthesized. The N-RC calcined at 800 °C (N-RC-800) shows a superior high specific surface area of 1491.85 m2 ⋅ g-1 and a notable high pore volume of 0.90 cm3 ⋅ g-1. When employed as a sulfur host, the S@N-RC-800 cathode illustrates excellent initial discharge capacity (1120.6 mAh ⋅ g-1) and maintains a reversible capacity of 625.4 mAh ⋅ g-1 after 500 cycles at 1 C. Simultaneously, the S@N-RC-800 cathode also shows excellent coulombic efficiency and ideal rate performance. Such exceptional electrochemical performance of S@N-RC-800 can be primarily attributable to N-RC's high specific surface area, high porosity, and abundant polar functional groups. This green and low-cost synthesis strategy offers a new avenue for harnessing the potential of waste biomass in the context of clean energy storage.

Fabrication of binder-free iron nanosheet arrays by an electrodeposition method for flexible Fe//I2 batteries anodes

Aqueous iron-iodine batteries (Fe//I2) are considered as a promising for portable and wearable electronics by virtue of the high theoretical specific capacity (∼960 mA h g−1) and rich natural abundance of Fe. However, the low actives utilization ratio of Fe foil and poor flexibility limit their practical usage. Here, we fabricate binder-free Fe nanosheet arrays electrode (Fe-CC) as anode by a simple and controllable electrochemical technique for flexible Fe//I2 batteries, which dramatically improve actives utilization ratio, avoid electrode damage/fracture caused by chemical corrosion and enhance the reaction kinetics. As a result, the assembled aqueous Fe-CC//I2@AC/CNT battery exbibits a stable cycling of 400 cycles, superior to that of Fe foil and anode-free Fe//I2 batteries. With the use of polyacrylamide-FeSO4 hydrogel electrolyte, a flexible quasi-solid-state Fe-CC//I2@AC/CNT battery is further designed. It has a high specific capacity of ∼195.4 mAh g−1 at a high rate of 3 A g−1, better than previous zinc ion batteries and Fe//I2 batteries. We also demonstrate the good ambient stability in terms of temperature and pressure and excellent flexibility of the quasi-solid-state Fe-CC//I2@AC/CNT battery. This work promotes the development of low-cost and high safety flexible iron-ion batteries on portable and wearable electronics.

Electrochemical Characteristics of Lignin in CTMP for Paper Battery Electrodes.

Lignin has been extensively researched as a cathode active material in secondary batteries. In the present work, the energy storage potential of lignin naturally present in papers made of softwood chemi-thermomechanical pulp (CTMP) is explored. More specifically, effects from softwood CTMP fines on the electrochemical characteristics have been studied. Compared to pulp fibers, fines are higher in lignin content and have higher specific surface area. It was expected that this would be positive for the electrode performance; however, the result points to the opposite. The fines do not significantly contribute to a higher lignin specific capacity, and they deteriorate the cycling stability. Higher fines content was found to result in a higher oxidative activity as well as more abundant competing reactions. These competing reactions are believed to be linked to the cycle stability. Therefore, we hypothesize that the electrochemical stability of lignin can be better understood by studying differences between fines and fiber lignin. As the theoretical specific capacity of this material is about 20 times larger than obtained here, identification of the reasons for this capacity discrepancy is needed to realize the full potential of lignin-based paper batteries.

Crystal Facet Control of Nickel–Cobalt Sulfide Nanostructure and Study of Supercapacitor Performance

Supercapacitors require excellent cycling stability and rate capability for electrodes. The NiCo2S4 spinel structure has caught much attention for its high conductivity and high theoretical specific capacity. However, due to the lack of active sites, it has been restricted in supercapacitors. In this research, the NiCo2S4 nano-material with needle, sheet and porous network morphologies were prepared by the addition of different kinds of surfactants via a simple hydrothermal method. At 1[Formula: see text]mA/cm2, capacitance of these NiCo2S4 nanomaterials is measured as 2.09[Formula: see text]F/cm2, 3.22[Formula: see text]F/cm2, and 4.42[Formula: see text]F/cm2, respectively. It was found that the exposure ratio of (111) and (220) crystal facets also has an effect on electrochemical performance, and NiCo2S4 with I[Formula: see text]/I[Formula: see text] of 3:1 showed better performance. Furthermore, NiCo2S4-PN//AC asymmetrical supercapacitor was assembled with NiCo2S4-PN serving as positive electrode and activated carbon (AC) as negative electrode. At a power density of 7.284[Formula: see text]mW/cm2, energy density achieved was 0.625[Formula: see text]mWh/cm2. Additionally, capacitance retention rate remained at 79.6% of initial capacitance after 1500 cycles. These outcomes are of great significance for developing more efficient, stable and reliable transition metal sulfide-based supercapacitors.

CoN//Co9S8 co-embedded in reduced graphene oxide as catalyst for catalytic conversion of polysulfides

Lithium-sulfur (Li–S) batteries with high theoretical specific capacity of 1675 mAh g−1 and energy density of 2600 Wh kg−1 are considered as a promising candidate for energy conversion and storage devices in future. However, some critical dilemmas such as low real energy density, high solubility of ether-based electrolytes and slow redox kinetics of long-chain polysulfides remain unsettled hindering their development. Here we design and propose a high-performance sulfur host material constructed by growing CoN/Co9S8 nanoparticles enclosed in reduced graphene oxide (RGO) and Co9S8 modified separator to enhance the electrochemical performance of Li–S batteries. The results of first principal calculations confirm that the calculated adsorption energies of Li2S8, Li2S6, Li2S4 and Li2S2 on the Co9S8 (111) surface are lower than that of the CoN (111) surface, indicating that the Co9S8 has stronger adsorbing effect with polysulfides. Furthermore, the catalytic effect in Li2S6 symmetric batteries and the nucleation of the Li2S tests display that the CoN/Co9S8@RGO has a fast conversion reaction kinetics and catalytic effect of polysulfides, thereby inhibiting the leakage of the polysulfides. Consequently, the S@CoN/Co9S8@RGO cathode with Co9S8 layer represents a high discharge capacity of 1367.7 mAh g−1 at 0.1C and a prolonged lifespan over 700 cycles at 1 C with an extremely low decay rate of 0.06 % per cycle and high cycling stability.

Facile synthesis of porous ZnCo2O4 micro–flower decorated with SWCNTs toward superior lithium storage performance

Binary metal oxides ZnM2O4 (A = Co, Fe, Mn) with spinel structures have been widely studied for their high theoretical specific capacity, relatively low cost, controllable morphology and synergistic effect between metal oxides with different charging and discharging mechanisms. However, the electrochemical properties are seriously affected by the huge volume change during cycles and poor electronic conductivity. In this work, porous ZnCo2O4 micro–flowers self–assembled from nano–sheets are successfully prepared by a simple solvothermal method followed by a heat treatment process without the aid of any soft/hard templates, and the resulting ZnCo2O4 active material is further decorated with SWCNTs. The phase composition, morphology characteristic, specific surface area, pore size distribution, elemental valence state and other information of the as–prepared samples are analyzed by relevant techniques such as XRD, FTIR, FESEM, (HR)TEM, TGA, Raman, N2 adsorption/desorption measurement and XPS. As anode materials in Li–ion batteries, the ZnCo2O4/SWCNTs product exhibits high charge/discharge specific capacity, excellent cycling stability and remarkable rate capability. Excellent electrochemical performance benefits from the special micro–/nano–structure characteristics of the as–synthesized ZnCo2O4/SWCNTs electrode material and good dynamic characteristics during cycling.

Single‐Atom Cobalt Catalyst Boosting Reaction Kinetics in Li–Organosulfur Battery

AbstractOrganosulfur compounds are regarded as a kind of prospective cathode materials for lithium batteries due to their high theoretical specific capacity. However, they still suffer from the issues of sluggish redox kinetics and low utilization. The rational design of the cathode host for effectively confining active materials and accelerating the sluggish sulfur kinetics is an effective strategy. Herein, the study synthesizes an atomic‐scale single‐atom cobalt catalyst and interweave it with CNTs to fabricate an ideal host material (donated as CoSANC@CNTs) for the cathode in Li–PTS batteries. Electrochemical measurements reveal that CoSANC not only efficiently accelerates the redox kinetics in the whole reaction process but also shows excellent adsorption capacity, which is corroborated by the theoretical calculation results as well. As excepted, the Li–PTS battery equipped with CoSANC@CNTs electrode delivers an outstanding long cycling stability with a high initial specific capacity of 550.2 mAh g−1 and a slow capacity decay rate of 0.05% per cycle over 700 cycles at 1 C. Even under a high PTS loading of 8.6 mg cm−2, the PTS/CoSANC@CNTs cathode is still maintained with an excellent capacity retention of 91.1% at 0.1 C after 50 cycles.

A DFT modeling of 4-cyclohexene-1,3-dione embedded in covalent triazine framework as a stable anode material for Li-ion batteries

Developing porous organic anode materials with outstanding electrical conductivity and high capacity is crucial to enhancing the performance of Li-ion batteries (LIBs). Herein, 4-cyclohexene-1,3-dione-functionalized covalent triazine framework (CYC-CTF0) monolayer as a new anode material in LIBs was explored through density functional theory calculations. The monolayer demonstrates good thermal, mechanical, and cycling stability and has a strong affinity for Li-ions to bind to the C=O and C=N redox-active sites. The adsorption of Li-ions transforms the CYC-CTF0 monolayer from being semiconducting to becoming metallic, reflecting its high electrical conductivity. Remarkably, the lattice undergoes a minimal expansion of 1.1 % throughout the charging and discharging process, suggesting an extended cycle life. The unit cell of the monolayer can be fully loaded with four Li-ions at different adsorption sites, exhibiting a specific theoretical capacity of 585.41 mAh g−1 and a low open-circuit voltage of 0.12 V. Moreover, the adsorbed Li-ions display a low diffusion energy barrier of 0.17 eV, enabling effective rates of charging and discharging. Our findings reveal the unique characteristics of the CYC-CTF0 monolayer as a promising anode material in LIBs.

Organic nano carbon source inducing 3D silica nanoparticles-graphene nanosheet layer on Cu current collector for high-performance anode-free lithium metal batteries

Anode-free lithium metal batteries (AFLBs) have attracted considerable attention due to their high theoretical specific capacity and absence of Li. However, the heterogeneous Li deposition and stripping on the lithiophobic Cu collector hamper AFLBs in practice. To achieve a uniform and reversible Li deposition, a carbon-based layer on the Cu collector has attracted intense interest due to its high conductivity. However, the 2D single-component carbon-based interface is inadequate lithiophilic for obtaining the homogeneous Li deposition and preventing the lithium dendrite from piercing the separator. Herein, we present a 3D embedded lithiophilic SiO2 nanoparticles-graphene nanosheet matrix (SiO2@G-M) on the Cu collector by organic nano carbon source. In this structure, the lithiophilic SiO2 nanoparticles as active points promote the homogeneous lithium nucleation and the 3D graphene nanosheet matrix offers homogenous electron distribution and voids to prevent the piercing. Finally, SiO2@G-M/Li cell shows a high coulombic efficiency of 98.62 % after 100 cycles at a high current density of 2 mA cm−2 with an areal capacity of 1 mAh cm−2.

One-pot solvothermal route to stannite-like Cu2CoSnS4 microspheres as pseudocapacitive material for electrochemical energy storage

This study explores the potential of stannite-like Cu2CoSnS4 (CCTS) microspheres for electrochemical energy storage applications. To fabricate Cu2CoSnS4, a facile solvothermal route was employed using ethylene glycol (EG) as the solvent and polyvinyl pyrrolidone (PVP) as the capping and structure-directing agent. Thorough characterization techniques, including X-ray diffraction, Raman spectroscopy, energy-dispersive X-ray analysis, and electron microscopy were employed to investigate the crystallinity, morphology, lattice structure, and growth mechanism of CCTS microspheres. UV–vis–NIR spectroscopy revealed that the material exhibits absorption in the visible and near-infrared range, with an optimal bandgap of 1.4 eV, suggesting potential applications in photovoltaics. We also analyzed the disordered stannite structure by a combined study of Raman spectroscopy and elemental analysis. Furthermore, the prepared CCTS microspheres were tested as active materials of supercapacitor electrodes, and the results showed promising electrochemical performance with a specific capacitance of 1700 F g−1 at 5 mV s−1, which is close to 70 % of the theoretical specific capacitance of Cu2CoSnS4. The electrode maintained 80.2 % capacitance retention and a Coulombic efficiency of 99.8 % after 500 cycles. This research highlights CCTS microspheres as promising candidates for energy harvesting and storage applications.

Pristine and defective 2D SiCN substrates as anode materials for sodium-ion batteries

Exploring more high-performance anode materials for sodium-ion batteries (SIBs) can smoothly help to build a more sustainable, cleaner, and reliable energy system. This study systematically investigates the potential of 2D pristine SiCN (p-SiCN) and defective (d-SiCN) substrate as candidate materials for SIBs anodes using first-principles computational method. The computational results reveal that the p-SiCN possesses excellent thermal stability and structural cyclical performance, good conductivity, high theoretical specific capacity (1486 mAh·g−1), low diffusion barrier (0.177 eV), and appropriate open-circuit voltage (0.340 V), which allows the p-SiCN substrate more suitable as a potential anode material for SIBs. Furthermore, by investigating the effects of intentionally designed defects on p-SiCN, it is observed that the adsorption energy and diffusion barrier of the Na atom on the d-SiCN substrate increase. Our work demonstrates that investigating the effect of defects on p-SiCN can better explore the properties of anode materials, thus further optimizing the battery performances.

Leonardite humic acid activated carbon/MnO\(_{2}\) composite nanostructures for supercapacitors

Abstract This work reports the preparation and electrochemical studies of activated carbon derived from leonardite humic acid composited with MnO2 for supercapacitors. Activated carbon contains high conductivity, high specific surface area, and accommodates large volume expansion/contraction during charging/discharging process. Meanwhile, MnO2 has very high theoretical specific capacity (1370 F∙g‒1). Their composite could significantly improve both the storage performance and cycle stability of supercapacitors. Moreover, humic acid from leonardite was selected to add value to this waste and reduce environmental pollution. By varying the carbonization temperature (500℃ to 800℃), the prepared samples carbonized at 800℃ exhibited fascinating properties. The oxidation state of Mn ions was in the mixed state of Mn+2 (41.2%) and Mn+2, +3 (52.8%). A gravimetric capacitance of 329 F∙g‒1 and 294 F∙g‒1 were observed at 2 mVs-1 and 0.5 Ag-1, respectively. The remaining gravimetric capacitance of 193 F∙g‒1 was evaluated at 1000 cycles, indicating its high cycle performance. Moreover, the gravimetric energy of 37.51 Wh∙kg‒1 and gravimetric power of 272.96 W∙kg‒1 were observed. When combined, the interesting electrochemical properties of leonardite humic acid-activated carbon/MnO2 composite nanostructures make them important options for supercapacitor application.

Three-dimensional ZnO/CC coupled with external magnetic field for controlled sodium deposition

Abstract Sodium-metal batteries are garnering increasing attention due to their utilization of abundant resources and high theoretical specific capacity. However, the growth of sodium dendrites has remained a challenging issue, which makes it difficult to apply. In this study, we employ carbon cloth as a substrate to mitigate the sodium dendrite growth, onto which sodium-affinitive material ZnO is grown to facilitate uniform nucleation. Furthermore, we enhance the cycling stability and rate performance significantly by introducing an external magnetic field. Under a 200 mT applied magnetic field and deposition/stripping at 1 mA/cm2 and 1 mAh/cm2, symmetric cells exhibit a remarkable cycling stability exceeding 1200 hours. Additionally, in full cells, NVP is used for the positive electrode, and ZnO/CC is the negative electrode, with a capacity of 108 mAh/g, and energy density maintained at 429.4 Wh/kg over 200 cycles under the influence of a 200 mT magnetic field.

Review of properties, synthesis, and energy applications of borophene, a novel boron-based 2D material

At least 16 bulk polymorphs of linked icosahedrons exist in boron that are not found in other materials, due to the low covalent radius and sp2 hybridization capacity of boron atoms. One of these is borophene, an exciting new nanomaterial with a wide range of possible energy uses. The existence of borophene, a two-dimensional (2D) material, has been proven by both theoretical and experimental studies. Borophene's high theoretical specific capacities, magnetic conductivity, and ion transport properties make it a promising candidate in energy applications. In this study, firstly, the structure, chemical, and physical properties of borophene were mentioned. Then, in terms of synthesis approaches, both top-down and bottom-up techniques (such as atomic layer deposition (ALD), chemical vapor deposition (CVD), exfoliation by sonochemistry, molecular beam epitaxy (MBE), and multi-step thermal decomposition (MTD) for ultrahigh-vacuum borophene deposition technologies) were discussed. Finally, its use as a catalyst in high-metal-ion batteries, hydrogen storage (HS), Nanoelectronics applications hydrogen evolution reaction (HER) was mentioned.

The Lithium Storage Mechanism of Zero-Strain Anode Materials with Ultralong Cycle Lives.

At present, graphite is a widely used anode material in commercial lithium-ion batteries for its low cost, but the large volume expansion (about 10%) after fully lithiated makes the material prone to cracking and even surface stripping in the cycle. Therefore, the development of zero-strain anode materials (volume change <1%) is of great significance. LiAl5O8 is a zero-strain insertion anode material with a high theoretical specific capacity. However, the Li+ storage mechanism remains unclear, and the cycle life as well as fast-charging capability need to be greatly improved to meet the practical requirements. In this study, LiAl5O8 nanorods are prepared by utilizing aluminum ethoxide nanowires as a soft template and doped with the Zr element to further improve the Li+ diffusion coefficient and electronic conductivity, which in turn improves cycle and rate performances. The Zr-doped LiAl5O8 presents a high reversible capacity of 227.2 mAh g-1 after 20,000 cycles under 5 A g-1, which significantly outperforms the state-of-the-art anode materials. In addition, the Li+ storage mechanisms of LiAl5O8 and Zr-doped LiAl5O8 are clearly clarified with a variety of characterization techniques including nuclear magnetic resonance. This work greatly promotes the practical process of zero-strain insertion anode materials.

Synthesis of binder-free hydrated vanadium oxide-polyaniline electrodes via in situ polymerization for high-performance aqueous zinc-ion batteries

Hydrated vanadium oxide, a kind of layered electrode material with high theoretical specific capacity, has great potential for developing high-performance, low-cost, and eco-friendly aqueous zinc-ion batteries. However, its characteristics of poor electronic conductivity, vanadium dissolution, and unstable structure lead to poor electrochemical performance, such as low specific capacity, poor rate performance and short cycle life. Combining PANI with layered hydrated vanadium oxide is expected to overcome the shortcomings and achieve high zinc storage performance. In this work, binder-free hydrated vanadium oxide-polyaniline inorganic–organic hybrid compounds deposited on carbon cloth (VOH-PANI/CC) are developed by combination of layer-by-layer and in-situ polymerization process. Benefiting from synergistic effect between polyaniline and hydrated vanadium pentoxide, the hybrid electrode (VOH-PANI/CC) delivers high capacities of 290 mA h/g at 0.5 A/g and 165 mA h/g at 4 A/g. In contrast, the specific capacities of VOH/CC are only 185 and 70 mA h/g at 0.5 and 4 A/g, respectively. This in-situ polymerization of aniline via layer-by-layer strategy on hydrated vanadium oxide provides a novel synthesis scheme for the use of vanadium oxide as cathode material for aqueous zinc-ion batteries.

Electrochemical active interlayer with porous architecture for reliable lithium–sulfur batteries

Although lithium–sulfur batteries have excellent theoretical specific capacity (1675 mAh g−1) and high energy density (2600 wh kg−1), their practical application is hampered by the severe “shuttle effect” of polysulfides in ether-based electrolytes. Soluble polysulfides can migrate across separator and react with lithium metal, resulting in a rapid capacity decay. In this study, we proposed an electrochemical active porous architecture (EPA) interlayer to address this tricky issue. Firstly, the porous architecture guarantees efficient electrolyte diffusion. Additionally, the catalytic vanadium nitride particles within the conductive skeleton can capture soluble polysulfides, accelerate their redox reaction, and suppress the “shuttle effect”, thereby further restraining the parasitic reaction between lithium metal anode and polysulfides. Therefore, integrating the EPA interlayer in the battery enables an initial capability of 1465.8 mAh g−1 at 0.1C and delivers a good rate performance at 2.0C (668.0 mAh g−1). The battery achieves an average capacity of 796.7 mAh g−1 within the first 500 cycles under 0.5C, with a high average Coulombic efficiency of 99.8 %, indicating the practical potential of EPA interlayer design for application in reliable lithium–sulfur batteries.

Heterostructure CoSe2/Sb2Se3 nanocrystals embedded into nanocage-in-nanofiber carbon framework for ultralong-life sodium-ion batteries

Transition metal selenides are considered as one of the most promising anode materials for sodium-ion batteries (SIBs) on account of their high theoretical specific capacity. However, the poor conductivity, sluggish kinetics and volume expansion during the (de)sodiation process hinder its application. Herein, a novel heterostructure of CoSe2/Sb2Se3 nanocrystals embedded into nanocage-in-nanofiber carbon framework is designed and constructed via electrospinning, carbonization, ion exchange and selenization processes. In this structure, bimetallic selenide heterostructure accelerates electron/ion transfer kinetics and Na+ adsorption capacity, carbon nanocages structure alleviates the volume expansion and maintains structural integrity during the (de)sodiation process, and carbon nanofibers connect the nanocages in series to shorten the electron transmission path and enhance electrical conductivity. As a self-supporting anode for SIBs, as-synthesized CoSe2/Sb2Se3@C@CNF shows a high reversible capacity of 406 mAh g-1 at 0.2 A g-1 after 200 cycles and displays excellent rate capability. More remarkably, the CoSe2/Sb2Se3@C@CNF anode manifests an outstanding cycling stability for over 2000 and 12,000 cycles at 1 and 5 A g-1, with the capacity retention being 97 % and 103 % respectively. Meanwhile, the excellent sodium storage performance is revealed by kinetic analysis, energy level analysis and density functional theory calculations.

High Safety Electrolyte Design for Enabling High Energy-Density System of LiNi0.8Co0.1Mn0.1O2//Phosphorus by Simultaneously Adjusting Dual Electrode/Electrolyte Interfaces.

The demand for state-of-the-art high-energy-density lithium-ion batteries is increasing. However, the low specific capacity of electrode materials in conventional full-cell systems cannot meet the requirements. Ni-rich layered oxide cathodes such as Li(Ni0.8Co0.1Mn0.1)O2 (NCM811) have a high theoretical specific capacity of 200 mAh g-1, but it is always accompanied by side reactions on the electrode/electrolyte interface. Phosphorus anode possesses a high theoretical specific capacity of 2596 mAh g-1, but it has a huge volume expansion (≈300%). Herein, a highly compatible and secure electrolyte is reported via introducing an additive with a narrow electrochemical window, Lithium difluoro(oxalato)borate (LiDFOB), into 1m LiPF6 EC/DMC with tris (2,2,2-trifluoroethyl) phosphate (TFEP) as a cosolvent. LiDFOB participates in the formation of organic/inorganic hybrid electrode/electrolyte interface layers at both the cathode and anode sides. The side reactions on the surface of the NCM811 cathode and the volume expansion of the phosphorus anode are effectively alleviated. The NCM811//RP full cell in this electrolyte shows high capacity retention of 82% after 150 cycles at a 0.5C rate. Meanwhile, the electrolyte shows non-flammability. This work highlights the importance of manipulating the electrode/electrolyte interface layers for the design of lithium-ion batteries with high energy density.

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

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 MoS2(1-x)Se2x 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.