MoS2 Sheets Research Articles

Design and fabrication OF Cu2O@MoS2/r-Go dendrite binary electrode for quasi – Symmetric capacitor- sustainable approach

Modified hummers method to synthesise GO from powdered graphite and sodium molybdate, then green synthesised Cu2O/MoS2/rGO nanostructure prepared by economical microwave approach. XRD analysis proved that Cu2O and MoS2/rGO were present in the sample. FTIR spectra revealed a Cu2O group at around 620 cm−1, whilst EDAX analysis revealed Mo, Cu, S, O, and C characteristic bands. rGO material resembles the SEM image of Cu2O/MoS2-rGo in appearance, with dendritic morphologies of Cu2O and MoS2 sheets on its exterior. When applied to nearby r-GO sheet formations, MoS2 thins down the layers. Incorporating rGO, a conductive material, into the MoS2/rGO composite greatly enhanced its capacity to store charges. Improved storage properties of the composite led to charge-discharge curves that were more symmetrical than those of pure MoS2. The significant heterostructure of 2D materials is responsible for their remarkable cyclic stability. Supercapacitors with a Cu2O/MoS2/r-GO nanostructure as manufactured are safe for use with batteries. Building 2D and 3D heterostructures to improve energy storage systems of the future is the goal of this endeavor.

Effect of Heterojunction Dynamics on Electrochemical Properties of ZnS/MoS2 Type-II Nanocomposite for Photovoltaic Application

In the present work, ZnS/MoS2 nanocomposite has been synthesized by hydrothermal route. X-ray diffraction analysis revealed ZnS and MoS2 phases, showing the crystallite size of 19.5 and 9.25 nm from W-H and S-S plots, respectively. The lattice parameters of MoS2 and ZnS were found to be a = b = 3.79 Å, c = 12.4 Å and a = b = 3.2 Å, and c = 9.5 Å, respectively. The dislocation density, stacking fault and strain from W-H and S-S plots were found to be 4.1 × 10−4, 2.4 × 10−3, −1.2 × 10-3 and −2.4 × 10−2, respectively. The absorbance peaks of the nanocomposite were observed at 209, 246 and 320 nm revealing a band gap of 3.3 eV with refractive index of 2.32. Scanning electron microscopy and transmission electron microscopy imaging demonstrated ZnS nanoparticles over MoS2 sheets with an average particle size of 45.9 and 23.8 nm, respectively. In cyclic voltammetry analysis, pure ZnS and nanocomposite showed maximum oxidation current of 0.25 and 0.51 mA, respectively. Electrochemical impedance spectroscopy analysis revealed the presence of Warburg diffusion with a high exchange current density of 2.5 mA along with electrolyte’s and working electrode’s resistance to be 1000 Ω and 100 Ω, respectively. Charge transfer resistance, Warburg impedance, electrical double layer capacitance and film’s capacitance was found to be 10 Ω, 1000 Ω·s−1/2, 100 μF and 1 μF, respectively.

Exfoliated MoS2 with tunable size effect towards anticorrosion application

MoS2 sheets are becoming more and more active in the field of anticorrosion coatings. In this work, different size of MoS2 were fabricated by a simple gradient centrifugation approach then introduced into epoxy coatings (EP). Composite coatings with smaller size and larger size of MoS2 were also prepared for comparison. Anticorrosion properties of the coatings were evaluated via electrochemical spectroscopy, salt spray tests and theoretical calculation in detail. The impedance arc of doping the 1.4±0.1 μm of EM2000 for EP was 4.8×107 Ω cm2 after 7d immersing, which is much higher than that of EM800/EP, EM1000/EP and EM3000/EP. Salt spray test and corrosion products analysis have also proved the proposed protection mechanism of EM2000/EP coating. Doping the optimized size of EM2000 could form nano-network covering the microcracks to impede the diffusion of corrosive medium. In addition, the theoretical calculation showed that the body-center adsorption of O2 show the weaker physisorption with adsorption energies of ∼ −0.64 eV and −0.14 eV for H2O and O2. Excellent barrier ability and enhanced dispersion of the optimized size of MoS2 sheets were responsible for the superior enhancement of the anticorrosion performance of EP coating.

2D Transition Metal Dichalcogenides and Their Composites with Carbon-Based Materials: Applications in the Electrochemical Detection of Antimicrobial Drugs in Aquatic Environments

The 2D layered transition metal dichalcogenides (TMDs), often described as analogues of graphene, are envisioned as the next generation of 2D nano-layered materials in the development of electrochemical-based sensors. Molybdenum disulfide, MoS2, is one of the best known and has received considerable attention, being considered as a semi-metal, with good conductivity, high surface area and low cost. In this study, MoS2 was chosen for its high mechanical strength, high surface area, and good charge carrying properties. The MoS2 was exfoliated into a few layered sheets using tannic acid to give an environmentally acceptable exfoliation routine. It was then combined with a carbon material and employed as a sensor for an antimicrobial drug in aquatic environments.The accumulation of antimicrobials in the aquatic environment is now a major concern with increasing evidence to show that they are contributing to the spread of antimicrobial resistance. There are a wide variety of antimicrobial drug families and one well known family is the sulfonamides. These synthetic drugs have the general formula R−SO2NH−R1, where R is an p-aminobenzoyl ring and the family differ in terms of the R1 substituent, which may be H or a 6− or 5−membered heterocyclic ring. They have the capacity to act on a wide range of bacterial infections and are employed in the fight against these infections. They are not easily biodegradable and therefore have the potential to accumulate in aquatic environments. Indeed, sulfonamides have been observed in rivers and coastal waters and concerning levels of sulfonamide resistant bacteria have also been reported in these environments [1]. Sulfanilamide (SFD) was chosen as the sulfonamide drug as it not only can be used to treat bacterial infections, but it is one of the main intermediates in the degradation of other family members [2]. The existing sensors for SFD have limited linear ranges in the vicinity of 1 to 100 mM and the LOD values are typically in the mM range and are not sufficiently low to detect low levels of SFD. Therefore, the aim of this study is to design an electrochemical sensor with a more extended linear region combined with a lower detection limit for the analysis of SFD in aqueous environments.Exfoliated MoS2 sheets were combined with reduced graphene oxide (rGO) and graphite flakes. The addition of the graphite flakes enhanced the overall stability of the sensor, making it more superior and efficient than the corresponding sensor fabricated with pure rGO. The rGO/G was firstly formed using electrodeposition from a slightly acidified sulfate solution and the exfoliated MoS2 sheets were then drop cast over the wrinkled rGO/G surface to form the final sensor, GCE/rGO/G/MoS2. The fabricated sensor exhibited an extended linear range from 0.1 to 566 μM, with a LOD of 86 nM, with good selectivity in the presence of various salts found in water and structurally related drugs from the sulfonamide family. The sensor showed very good reproducibility with the RSD at 0.39%, repeatability and acceptable long term stability over a 10-day period with good recovery from both tap and river water. This approach, combining exfoliated MoS2 sheets with rGO and graphite, has the potential to be used in formulating sensors for other analytes. References A. Adenaya, M. Berger, T. Brinkhoff, M. Ribas-Ribas, O. Wurl, Usage of antibiotics in aquaculture and the impact on coastal waters, Mar Pollut Bull. 188 (2023). https://doi.org/10.1016/j.marpolbul.2023.114645.Q. Cai, J. Hu, Decomposition of sulfamethoxazole and trimethoprim by continuous UVA/LED/TiO2 photocatalysis: Decomposition pathways, residual antibacterial activity and toxicity, J Hazard Mater. 323 (2017) 527–536. https://doi.org/10.1016/j.jhazmat.2016.06.006.

P-doped MoS2 nanosheets embedded in 3D porous carbon for electrocatalytic hydrogen evolution reaction

Due to its inherent electrochemical catalytic activity, molybdenum sulfide (MoS2) is a potential electrocatalyst for hydrogen evolution reaction (HER). However, the limited exposure of its active sites resulting from the easy stacking of nanosheets and inert basal plane hampered its optimal catalytic activity. Herein, we developed a novel facile hydrothermal method to prepare phosphorus-doped MoS2 nanosheets anchored on agar-derived 3D nitrogen-doped porous carbon (P-MoS2/NC). The synthesized P-MoS2/NC electrocatalyst possesses high HER catalytic activity with a low overpotential of 167 mV at 10 mA cm−2 and a small Tafel slope of 45 mV dec−1. The excellent performance is attributed to the unique 3D network carbon structure, which avoids the stacking of the MoS2 sheets resulting in more exposed active sites. Additionally, the P atom introduced on the surface of MoS2 sheets successfully activated the in-plane inertness. This work provides an efficient strategy for designing and preparing high-quality catalysts with enhanced electrocatalytic HER activity.

CoS2 nanoparticles encapsulation promotes stable MoS2@CoS2@CNFs heterostructure and durable sodium-ion storage

Layered MoS2 are promising anode materials due to the applicable interlayer spacing (0.62 nm) and high theoretical specific capacity (669mAh g−1). Nevertheless, the low electric conductivity, large structure variation and sluggish ionic kinetics result in rapid capacity decay and suboptimal cycle performance of MoS2-based sodium-ion batteries (SIBs). Here, the two-step methodology was used to grow MoS2 sheets on the surface of N-doped carbon fibers with CoS2 nanoparticles encapsulated in. The obtained MoS2@CoS2@CNFs exhibit a distinctive hierarchical structure, which increases the electrode-electrolyte interface, thereby minimizing the diffusion distance of Na+. Experiment and calculation results demonstrates that the incorporation of CoS2 not only enhances the ion mobility and pseudocapacitance contribution of the electrode material, but also amplifies its conductivity and adsorption energy of Na+, ultimately elevating the rate performance and ensuring long cycle stability of SIBs. Consequently, the MoS2@CoS2@CNFs composite enabled a commendable capacity of 494.5 mAh g−1 after 700 cycles at 0.5 A g−1. Impressively, when the current density was increased to 2 A g−1, it reserved a capacity of 310 mAh g−1 for 2000 cycles. To encapsulation of CoS2 nanoparticles in the MoS2@CoS2@CNFs composite promotes the stability of the anodes and boosts durable Na+ storage, making it a promising method for designing high performance SIBs.

Sono-photocatalytic degradation of Tetracycline and Ciprofloxacin antibiotics using microwave-reflux of NiO-MoS2/rGO ternary nanocomposite

In this study, NiO-MoS2/rGO nanocomposites were synthesized successfully by a simple microwave assisted refluxing method by varying the mass ratios of rGO. The NiMG-50 ternary nanocomposite has been applied by sonocatalytic, photocatalytic and sono-photocatalytic degradation for the removal of tetracycline (TTC) and ciprofloxacin (CIP) antibiotics. Physicochemical properties of the synthesized samples were characterized by Powder X-ray Diffraction (PXRD), Energy Dispersive X-ray Spectroscopy (EDAX) and X-ray Photoelectron Spectroscopy (XPS) corroborated the phase purity of NiMG-50 nanocomposite. The High Resolution Scanning Electron Microscopy (HR-SEM) image reveals the zigzag arrangements of NiO nanoflakes over MoS2 and rGO sheets. The tight contact of platelet shaped-NiO NP’s and curled layer-MoS2 on the sheets of rGO results in the separation of photo-induced e--h+ pairs as demonstrated by the High Resolution Transmission Electron Microscopy (HR-TEM) analysis. Optical properties reveal a reduced band gap and enhanced separation efficiency with fast charge transfer rate, improving the organic pollutant degradation efficiency. NiMG-50 demonstrated a good catalytic activity against TTC and CIP in sono-photocatalytic process with an efficiency of 94.10 % and 83.96 % at 35 and 90 min, respectively. Simultaneously, the experimental results showed that the NiMG-50 composite follows the pseudo-first order reaction kinetics with a rate constant (KSP) value of 0.077 min−1 and 0.015 min−1 for TTC and CIP. The radical trapping test and degradation mechanism indicated that the continuous contribution of ̇OH and ̇O2– reactive radicals are the major ones responsible for the active involvement in the degradation reaction. This research work gives a fresh prospects to the as prepared NiMG catalyst as an efficient composite with a good applicability for the sono-photocatalytic degradation of pharmaceutical products.

Improved performance of TiN nano buds decorated MoS2 sheets in asymmetric supercapacitors

Improved performance of TiN nano buds decorated MoS2 sheets in asymmetric supercapacitors

Antibacterial activity of molybdenum disulfide and green silver nanoparticles reduced by tea tree essential oil compounds

The increasing resistance of microorganisms against antibiotics puts at risk the human being. This event requires urgently developing strategies for producing alternative antibacterial agents. The combination of green silver nanoparticles (reduced by essential oil) and molybdenum disulfide can be synergistically explored given the interaction of components. Herein, it is reported the response of isolated and combined components with resulting outstanding kinetics of kill-time (complete elimination of Staphylococcus aureus and Escherichia coli after four hours of contact), effective action against biofilm formation (~99% of inhibition in the biofilm formation). These results confirm that the intercalation of silver nanoparticles between exfoliated sheets of MoS2 represents a promising strategy to develop efficient antibacterial agents against Gram-positive and Gram-negative bacteria.

Mediation of Interfacial Mo2C Bridging Effect in MoS2@Carbon Colloid Dots Featuring Improved Photovoltaic Performances of Si‐Based Hybrid Solar Cells

AbstractAdvances in silicon‐based hybrid solar cells with high photovoltaic performance, low synthetic cost, and sound environmental resistance are emerged as potential candidate for solar conversion. Solution‐processed few‐layer MoS2 sheets are regarded as compelling constitutes that paves ways for tailoring the solar harvesting capability; yet the improvement on charge separation of photoexcited carriers remains demanded, and the lack of environmental stability due to intentionally grabbing electrons from adsorbed moistures constrains the scope of practical assessment. In this work, the employment of MoS2/Mo2C/carbon colloid dots (CCDs) heterostructures within PEDOT:PSS matrix is invoked, where the transfer of photoexcited electrons from MoS2 is mediated with Mo2C electron‐transport channels, which further couple out the creation of positive trions by combining with defect‐bound excitons at CCD surfaces. These features dynamically involve with slow recombination probability and further improve the photovoltaic gain. Thus, the noticeable improvement of conversion efficiency of 16.1% with 1.6 times of efficiency enhancement outperforming the bare conventional hybrid solar cells is accomplished, and further exhibits a sound long‐term stability, which opens new avenues for exploiting the photophysical bound‐carrier transition on advanced photovoltaic applications.

Zinc Sensing Advancements for Prostate Cancer Detection: Insights from Zincon-MoS2 Electrochemical Characterization

Epidemiological research has illuminated the pivotal role of zinc (Zn) in prostate cancer detection. Among its noteworthy attributes, a healthy prostate is characterized by a higher zinc content, while in a malignant prostate, there is a marked decrease in zinc aggregation. Electrochemical sensing techniques have proven to be valuable in studying zinc behaviour; In this study, we examined the electrochemical characteristics of a glassy carbon electrode that underwent modification with Zincon-MoS2. Our primary objective was to achieve a sensitive and selective approach for detecting zinc in the context of prostate cancer. The synthesis of the Zincon-MoS2 composite was executed through hydrothermal, and subsequent chemical functionalization with zinc was employed to augment its affinity for zinc ions. Conducting cyclic voltammetry measurements, we sought to gain deeper electrochemical insights when exposed to zinc ions. The Zincon-MoS2-modified electrode that we created exhibited exceptional electrochemical capabilities for precisely detecting zinc. We studied the behaviour of MoS2 sheet on microlevel and rest of the studies are done on nano dimensions. We reported 0.912 μM Limit of detection which is quite low then the limit of the zinc concentration in healthy prostate i.e 12 μM. Additionally, the limit of quantification was calculated to be 3.04 μM, indicating the minimum detectable concentration of zinc. The sensitivity of the sensor was found to be 0.086 μAmp/nM-cm2, emphasizing its ability to detect zinc accurately. Furthermore, the effect of pH variations in the electrolyte on the maximum current levels was studied, providing valuable information on the response of the sensor under different physiological conditions. The electrochemical insights obtained through this investigation contribute to a deeper understanding of zinc behaviour in prostate cancer.

Robust Low-Friction and Low-Wear TiNbMoTaCr High-Entropy Film Enabled by Periodically Inserting Curved MoS2 Sheets.

The well-known integration of physical, chemical, and mechanical properties enables high-entropy alloys (HEAs) to be applied in various fields; however, refractory HEAs are brittle and susceptible to abrasive wear at high coefficients of friction (COF), resulting in insufficient mechanical durability against abrasion. Herein, curved MoS2 nanosheets are periodically introduced into the TiNbMoTaCr film for triggering the self-assembly mixed metal oxides @MoS2 nanoscrolls, which contain hard mixed metal oxides cores and the low-shearing lubricant MoS2 shells, during the friction in the air environment; such mixed metal oxides@MoS2 nanoscrolls in the friction interfaces can contribute to the robust low friction and low wear. Compared to the pure TiNbMoTaCr film (with high COF of ∼0.78, low abrasive durability identified by worn-out event), the periodic incorporation of 10 nm thickness curved MoS2 sheets can successfully achieve a low COF of ∼0.08 and low wear rate of ∼9.561 × 10-8 mm3/ Nm, much lower than the pure MoS2 film (COF = ∼ 0.21, wear rate = ∼ 1.03 × 10-6 mm3/ Nm). Such superior tribological properties originate from the cooperative interaction of TiNbMoTaCr nanolayers and curved MoS2 nanosheets, accompanied by the self-assembly of mixed metal oxides@MoS2 nanoscrolls. In these nanoscrolls, TiNbMoTaCr can act as an 'air-absorbing agent' to form high-loading mixed metal oxide cores and serve as an 'oxygen sacrificer,' preventing the low-shearing lubricant curved MoS2 nanosheets from oxidation. In addition, even with the soft MoS2, the hardness of the TiNbMoTaCr/MoS2 nanomultilayers can still be well maintained and increased above the calculated values by mixing law, further favoring superior mechanical durability. The synergetic effect of TiNbMoTaCr and curved MoS2 nanosheets during the friction in air can provide a route to design HEA films with enhanced tribological properties for better mechanical durability and broader application prospects.

Simultaneous electrochemical detection of dopamine and uric acid based on tri-composite of poly-pyrrole and α-Fe2O3 embedded MoS2 sheets modified electrode

Poly-pyrrole (Ppy) with α-Fe2O3 and MoS2 has served as an attractive catalyst for biosensor applications due to their versatility and structural diversity. The abnormal concentrations of dopamine (DA) and uric acid (UA) causes serious health issues in human. Hence, rapid and sensitive method requires to monitor DA and UA levels. In this esteem, a electrochemical biosensor based on Ppy-α-Fe2O3-MoS2 composite for rapid and accurate estimation of DA and UA in physiological conditions were reported. The ternary components like Ppy, MoS2 sheets, and α-Fe2O3 attribute the heterogeneous interfacial contact which leads to enhanced catalytic behavior. The Ppy-α-Fe2O3-MoS2/GCE electrocatalyst demonstrates the linear response of DA, and UA in the concentration range of 300 nM-1 mM with a detection limit of 73 nM, and 61 nM for DA and UA, respectively (S/N = 3σ/n). The sensitivity of the sensor was found to be 1.26 μA μM−1 cm2.The proposed methodology is highly selective, sensitive and cheaper to detect the DA and UA simultaneously. This approach could be utilized to employ in the fabrication of biosensor devices for practical utility in clinical diagnostics and health care centers.

Controlled construction of Co3S4@CoMoS yolk-shell sphere for efficient hydrodesulfurization promoted by hydrogen spillover effect

A yolk-shell structured Co3S4@CoMoS catalyst was prepared through Oswald ripening method and subsequently used for hydrodesulfurization (HDS) reaction. The shells, constructed from Co-promoted MoS2 nanosheets, possess abundant active sites and facilitate the adsorption of reactants through the development of pore channels. The MoS2 sheets are arranged in a staggered and convoluted manner, creating numerous defect sites. The shorter MoS2 slabs provide a wide distribution of reactive sites, ensuring efficient reactions. The Co3S4 species within the inner core acts as an auxiliary active phase, inducing the hydrogen spillover effect in the HDS system. This facilitates the transfer of active hydrogen species to the CoMoS shell, where both CoMoS and Co3S4 phases synergistically enhance the HDS reaction. The Co3S4@CoMoS catalyst achieved up to 99.2% dibenzothiophene (DBT) conversion and 94.9% 4,6-dimethyldibenzothiophene conversion at the lower dosage (30 mg). The structure-activity relationships between active phase and HDS activity were investigated via in-situ infrared spectroscopy and other characterizations as well as density functional theory calculations.

Electrochemical detection of sulfanilamide using tannic acid exfoliated MoS2 nanosheets combined with reduced graphene oxide/graphite

Sulfonamides are a family of synthetic drugs with a broad-spectrum of antimicrobial activity. Like other antimicrobials, they have been found in aquatic environments, making their detection important. Herein, an electrochemical sensor was designed using tannic acid exfoliated few-layered MoS2 sheets, which were combined with a mixture of reduced graphene oxide (rGO) and graphite flakes (G). The rGO/G was formed using electrodeposition, by cycling from −0.5 to −1.5 V in an acidified sulfate solution with well dispersed GO and G. The exfoliated MoS2 sheets were drop cast over the wrinkled rGO/G surface to form the final sensor, GCE/rGO/G/ta-MoS2. The mixture of rGO/G was superior to pure rGO in formulating the sensor. The fabricated sensor exhibited an extended linear range from 0.1 to 566 μM, with a LOD of 86 nM, with good selectivity in the presence of various salts found in water and structurally related drugs from the sulfonamide family. The sensor showed very good reproducibility with the RSD at 0.48 %, repeatability and acceptable long term stability over a 10-day period. Good recovery from both tap and river water was achieved, with recovery ranging from 90.4 to 98.9 % for tap water and from 83.5 to 94.4 % for real river water samples.

Multi-synergies of hollow CdS cubes on MoS2 sheets for enhanced visible-light-driven photocatalysis

Formation of intimate interfaces in semiconductor-based heteronanostructures (HNSs) is widely adopted to enhance the efficiency of photocatalytic hydrogen evolution via water splitting because of their efficient light harvesting, charge carrier separation, and transfer capability originating from intimate interface. Here, we employ a multi-step approach, involving the direct growth of the photocatalytically active semiconductor (Cu2O) on MoS2 sheets, along with anion exchange and cation exchange methods to design hollow CdS cube/MoS2 sheet HNSs (H-CdS/MoS2 HNSs) consisting of intimate interfaces between hollow CdS cubes and MoS2 sheets. These distinctive morphological and compositional features endow H-CdS/MoS2 HNSs with exceptional charge transfer capability, intrinsic catalytic activity, and light-harvesting capacity. Consequently, H-CdS/MoS2 HNSs demonstrate significantly enhanced photocatalytic performance and stability for hydrogen evolution reactions and pollutant degradation under visible light irradiation compared to their binary and unary photocatalyst counterparts. This design strategy demonstrates the significance of forming intimate interfaces using hollow semiconductors in HNSs for advanced photocatalysis.

Enhanced second harmonic generation by an atomically thin MoS2 sheet attached to a resonant metasurface.

Two-dimensional transition metal dichalcogenides have shown large second-order nonlinear responses due to their broken crystal inversion symmetry. However, their nonlinear interaction with light is restricted to an atomically thin layer. Placing a sheet of transition metal dichalcogenides on a resonant metasurface enhances the field interacting with the nonlinear material thus compensating for this shortcoming. But, it remains a challenge to tune resonances such, that they coincide with fundamental and second harmonic frequencies simultaneously. Here we demonstrate two independent methods to achieve that goal and numerically illustrate our findings for a MoS2 layer combined with silicon nitride photonic crystals. We numerically demonstrate 20-fold and 170-fold enhancement of second-harmonic generation compared with a design based on a single resonant structure. Although we focus on that specific configuration our approach can likewise be applied to other dielectrics combined with highly nonlinear 2D materials.

Non-volatile memory field effect transistor composed of ferroelectric Mn-doped InP thin films and single-layer MoS2 channel

Ferroelectric properties can be generated by doping semiconductor thin films of ZnO and InP with a transition metal such as Mn. Furthermore, ferroelectric thin films exhibiting ferroelectric properties can be utilized as non-volatile memory components, potentially replacing conventional flash memory. In this study, we investigated non-volatile memory properties using field-effect transistors (NVMFET) fabricated from Mn-doped InP (MIP) thin films and single-layer MoS2 sheets. The 5 % Mn-doped MIP thin films exhibited a larger remanent polarization of 8.2 μC/cm2 compared to the 3 % Mn-doped films with 5.1 μC/cm2. The NVMFET devices, operating as non-volatile memory devices, demonstrated a distinct memory window for current changes. Notably, enhancing the remanent polarization of the 5 % Mn-doped MIP thin film further improved the memory window of the corresponding NVMFET.

Co@MoS2 Nanocatalyst: Enhanced Activation of Peroxymonosulfate for Effective Degradation of Sulfadiazine

To improve the activation efficiency of PMS to efficiently degrade antibiotic sulfadiazine (SD), herein, a Co@MoS2 catalyst was prepared by a one-step hydrothermal process. The unique petal-like structure of MoS2 enables the transition metal Co to achieve high dispersion and avoid agglomeration. Mo(IV) and unsaturated S accelerate the electron transfer between Co[Formula: see text] and Co[Formula: see text] to improve the cycling efficiency and thus realize the efficient activation of PMS. The results of active substance quenching experiment and ESR analysis show that the main active substance for the efficient degradation of SD by Co@MoS2 is the non-radical 1O2, while the other three radicals [Formula: see text], ⋅OH and [Formula: see text] contribute significantly to the efficient degradation of SD. And after 5 cycles, the degradation could still be as high as 90%. The strong consolidation of Co on the petal-shaped sheet of MoS2 ensures the stability of Co@MoS2 catalyst.

Two-dimensional architecture of N,S-codoped nanocarbon composites embedding few-layer MoS2 for efficient lithium storage.

The exploration and advancement of highly efficient anode materials for lithium-ion batteries (LIBs) are critical to meet the growing demands of the energy storage market. In this study, we present an easily scalable synthesis method for the one-pot formation of few-layer MoS2 nanosheets on a N,S dual-doped carbon monolith with a two-dimensional (2D) architecture, termed MoS2/NSCS. Systematic electrochemical measurements demonstrate that MoS2/NSCS, when employed as the anode material in LIBs, exhibits a high capacity of 681 mA h g-1 at 0.2 A g-1 even after 110 cycles. The exceptional electrochemical performance of MoS2/NSCS can be attributed to its unique porous 2D architecture. The few-layer MoS2 sheets with a large interlayer distance reduce ion diffusion pathways and enhance ion mobility rates. Additionally, the N,S-doped porous carbon matrix not only preserves structural integrity but also facilitates electronic conductivity. These combined factors contribute to the reversible electrochemical activities observed in MoS2/NSCS, highlighting its potential as a promising anode material for high-performance LIBs.