Copper Molybdenum Sulfide Research Articles

Copper molybdenum sulfide coupled with multi-walled carbon nanotube nanocomposite for robust water splitting process

Developing eco-friendly and efficient non-noble catalysts is crucial for cleaner energy production, nevertheless, optimizing the catalyst is challengeable. The Cu2MoS4 were successfully synthesized with various amount of MWCNTs. The suitable amount of high conductivity of MWCNT can greatly accelerate its HER and OER kinetics, which was demonstrated with the obtained results. XRD spectra revealed tetragonal Cu2MoS4 structure with I 4‾ 2 m space group. Carbon existence was substantiated by Raman spectra, and the ID/IG value of Cu2MoS4/MWCNT-100 was 0.98. The Cu2MoS4 nanoplates were strongly anchored to MWCNTs, as demonstrated by the morphological analysis of SEM and TEM images. The optimized catalyst (denoted as Cu2MoS4/MWCNT-100) exhibits high bifunctional with low 140 mV overpotential value and 193 mV@10 mA/cm2 for HER and OER and a lower Tafel slope value of 93 mV/dec and 51 mV/dec for HER and OER. Moreover, it revealed good catalytic activity with high electrical conductivity (0.361 Ω and 0.897 Ω for HER and OER) and high capacitance value (5.9 mF/cm2 and 9.4 mF/cm2 for HER and OER) with better stability. Lastly, we construct overall water splitting electrolyzer by optimized electrocatalyst as both anode and cathode entail cell voltage as 1.57 V only to deliver 10 mA/cm2 with a faradaic efficiency of 98.75 % for H2 and 93.28 % for O2 and it was believed as active material for water splitting.

Pullulan Polysaccharide as an Eco-Friendly Depressant for Flotation Separation of Chalcopyrite and Molybdenite.

It is difficult to separate molybdenite and chalcopyrite by froth flotation due to the good floatability of the two minerals. In this paper, the separation of copper-molybdenum sulfide minerals was realized by using pullulan polysaccharide (PU) as the depressant. The flotation test results showed that the copper concentrate grade increased from 16.24 to 29.86%, and the copper concentrate recovery reached 83.55% under low alkali conditions. The selective separation mechanism of the two minerals by PU was revealed through contact angle measurements, ζ-potential measurements, Fourier transform infrared (FTIR) spectroscopy analyses, and X-ray photoelectron spectroscopy (XPS) analyses. The ζ-potential and contact angle results showed that PU is more easily adsorbed on molybdenite to strengthen the hydrophilicity of molybdenite. The FTIR and XPS results showed that PU is adsorbed on molybdenite by physical interactions, and hydrophobic interactions and hydrogen bonding play a major role.

Flotation separation of chalcopyrite from molybdenite with sodium thioglycolate: Mechanistic insights from experiments and MD simulations

The pivotal roles of Cu and Mo in industrial applications accentuate the importance of effectively separating and recovering chalcopyrite and molybdenite. They commonly exist together in natural environments, necessitating their segregation prior to engaging in smelting processes. The separation is mainly accomplished through flotation. The inadequate comprehension of the mechanisms of thiol depressants, commonly used in the separation of chalcopyrite and molybdenite, poses challenges to both resource recovery and the development of depressants. Based on the bulk flotation practice of copper-molybdenum sulfide minerals, this study investigated the separation effect and mechanism of sodium thioglycolate (STG) on xanthate-treated chalcopyrite and molybdenite. Flotation and contact angle tests validate that STG enhances the hydrophilicity of chalcopyrite surfaces, leading to an 83.79% flotation separation efficiency for molybdenite. Various methodologies were employed to explore the mechanism of the depressant, encompassing open-circuit potential measurements, electrochemical impedance spectroscopy, X-ray photoelectron spectroscopy, infrared and ultraviolet spectroscopy, time-of-flight secondary ion mass spectrometry, classical molecular dynamics and ab initio molecular dynamics simulations. The stable adsorption layer of STG is established by the interaction of thiol groups from STG with Cu and Fe sites on the chalcopyrite surface, resulting in the formation of Cu(I)-S and Fe(III)-S structures. The adsorption density of STG layer on the chalcopyrite surface is four times greater than that on molybdenite. Additionally, following the adsorption of STG, the previously adsorbed xanthate chalcopyrite surface is desorbed with an efficiency of 65.88%. These findings contribute to the elucidation of the mechanistic understanding of thiol-containing depressants in the flotation separation process of copper-molybdenum sulfide minerals and establish a basis for the prospective advancement of mineral processing reagents.

Core–shell bimetallic copper–molybdenum sulfides nanomaterials derived from a Cu-based metal-organic framework as efficient bifunctional electrocatalyts

The critical depletion of fossil fuels and the alarming increase in environmental pollution highlight the urgent need to develop efficient and durable electrocatalysts to produce renewable energy. We propose a hydrothermal synthesis of a CuxS@MoS2 core–shell hybrid electrocatalyst with enhanced catalytic activity for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). Utilizing Cu-BTC as a template, our proposed hydrothermal synthesis results in a unique core–shell morphology comprising bimetallic metal sulfide components. This configuration effectively expands the electrochemically active surface area, enhancing charge transfer kinetics and improving catalytic activity. The optimized CuxS@MoS2 electrocatalyst presents low overpotentials of 141 and 334 mV for the OER and HER, respectively, achieving a current density of 10 mA cm−2. This novel synthesis offers a feasible strategy for the preparation of high-efficiency core–shell bimetallic metal sulfide nanomaterials suitable for application in various fields such as energy conversion and storage.

Dual-Phase Coexistence Design and Advanced Electrochemical Performance of Cu2MoS4 Electrode Materials for Supercapacitor Application

The tetragonal layered transition metal copper–molybdenum sulfide Cu2MoS4 (CMS) possesses a high theoretical electrochemical potential because of its abundant redox properties and large layered surface area, which is favorable for ion adsorption/desorption and transport. Cu2MoS4 contains P and I phases, exhibiting different crystal structures, ion transport characteristics, and electrochemical properties accordingly. In this work, for the first time, Cu2MoS4 electrode materials with dual-phase compositions are designed and prepared for supercapacitor application, providing a synergistic effect with high electron transport efficiency and structural stability. Upon an in-depth optimization process, the optimal CMS-4 sample having P and I phases coexisting yields the optimal electrochemical behavior. The CMS-4@carbon cloth (CC) electrode provides a specific capacity of 33.9 mAh g–1 at 1 A g–1, which is 12.6 and 4.0 times higher than the pure P and I phases, respectively. The assembled MnO2@CC//CMS-4@CC supercapacitor exhibits a high energy density of 16.8 Wh kg–1 at 800 W kg–1 power density. The results demonstrate that two-phase coexistence of Cu2MoS4 significantly enhances the electrochemical activities owing to the synergistic effects of P and I phases and provides a promising material for supercapacitor negative electrodes.

Copper molybdenum sulfide (Cu2MoS4) nanoplates as a proficient electrocatalytic interface for enhancing the electrochemical redox signals of ofloxacin for detection in pharmaceutical samples

In this study, a novel electrochemical sensor for the accurate determination of ofloxacin in a pharmaceutical sample was developed using active-site-rich Cu2MoS4 nanoplates as an excellent electrocatalytic platform.

Adsorption of a new reagent scheme on chalcopyrite and molybdenite surfaces causing an efficiency flotation separation: Insights from first-principles calculations

Herein, a new and environmentally friendly process scheme containing PGA as depressant and Z200 as collector for chalcopyrite-molybdenite bulk flotation and STG as depressant for chalcopyrite/molybdenite separation flotation was applied to the separation of pyritic Cu-Mo sulfide ore from Daye, Hubei Province, China. The flotation results showed that the new process scheme not only can efficiently achieve the flotation separation of chalcopyrite and molybdenite, but also can reduce the dosage of STG in chalcopyrite/molybdenite separation compared with the traditional process combining CaO and BX. The closed-circuit flotation experiment results further demonstrated this preferable result. Besides, the differences in the adsorption of STG on the chalcopyrite (112) surface in the presence of Z200 and BX were investigated by first-principles calculations at the atomic level. The calculation results showed that the STG adsorption on chalcopyrite (112) surface in the presence of Z200 was easier than that in the presence of BX, and the STG adsorption weakened the Z200 adsorption on chalcopyrite (112) surface, which provides atomic-scale explanations to the less STG dosage in chalcopyrite/molybdenite separation. This new reagent scheme has environmental advantages and great reference value for the separation of other pyritic copper-molybdenum sulfide ores.

High-sensitivity amperometric hydrazine sensor based on AuNPs decorated with hollow-structured copper molybdenum sulfide nanomaterials

Hollow-structured hybrid nanomaterials were superior electrocatalysts on account of their unique structures and preeminent properties. This study showed the synthesis of Au decorated with hollow-structured Cu2MoS4 (H-CMS) nanohybrid via hydrothermal and chemical reduction methods. Furthermore, novel hydrazine (N2H4) electrochemical sensor was fabricated based on the as-prepared nanocomposites. The characterization results revealed that homogeneous AuNPs with an average diameter of 13 nm were anchored on the surface and internal cavity of hollow CMS spheres. In addition, the sensor exhibited some excellent electrochemical performance for N2H4 detection. The linear range obtained by the as-proposed sensor was 0.02–377.7 μM, a much lower detection limit with 7 nM (S/N＝3), and a higher sensitivity with 440.1 μA mM−1 cm−2. The linear range of the sensor was maintained at the same level as the widest or better in some cases compared with the similar type of N2H4 sensors previously reported. At least two orders of magnitude reduced the detection limit of the as-proposed sensor. It was about 21-fold lower than that of the TiO2 @PANI@Au/glassy carbon electrode (GCE) sensor with the lowest detection limit. A factor of 1.5 times improved the sensitivity compared with the analogous type Au-Fe3O4-GO/GCE sensor. Additionally, the Au/H-CMS/GCE sensor displayed fast responses, high selectivity, and superior stability for N2H4 detection.

Ternary copper molybdenum sulfide (Cu2MoS4) nanoparticles anchored on PANI/rGO as electrocatalysts for oxygen evolution reaction (OER)

A trinuclear heterobimetallic complex with general formula [Cu(PPh3)S2MoS2Cu(PPh3)2]·CHCl3 (SSP) has been synthesized, and its characterization executed using FTIR, NMR, electronic absorption spectroscopies, and single‐crystal X‐ray technique. The complex is solvothermally decomposed in octadecylamine (ODA) to yield ternary copper molybdenum sulfide nanoparticles and successfully grafted onto 2D materials, namely, reduced graphene oxide (rGO) or polyaniline (PANI), and these composites are utilized for oxygen evolution half‐cell reaction (OER). The copper molybdenum sulfide nanoparticles as well as their composites with rGO and PANI and rGO + PANI were characterized using powder X‐ray diffraction, SEM, and EDX analyses. Electrochemical measurements suggested that the modified electrodes have notable electrocatalytic activity toward OER with onset overpotential 400 mV for CMS + PANI and 395 mV for CMS + rGO + PANI. This is the first study on the use of copper molybdenum sulfide nanoparticles composites with rGO and PANI as electrocatalysts for OER displaying substantial synergistic activity.

Self-assembled cotton-like copper–molybdenum sulfide and phosphide as a bifunctional electrode for green energy storage and production

As the world's energy needs grow and environmental concerns intensify, there is an increasing need for research into developing new materials that may be used in energy production and storage. Herein, we developed copper-molybdenum (Cu–Mo) sulfide and phosphide-based cotton-like nanoarchitectures via hydrothermal strategy and they were characterized using various analytical techniques. The prepared sulfide and phosphide-based materials showed HER overpotentials of 207 mV and 147 mV, respectively, as well as Tafel slope values of 118 mV/dec and 109 mV/dec at 10 mA/cm2. While OER at the same current density showed 270 mV and 213 mV overpotentials with 82 mV/dec and 48 mV/dec Tafel slope, respectively. In addition, the prepared sulfide and phosphide-based materials showed significant performance towards supercapacitors, displaying specific capacitances of 3.5 and 5.2 F/cm2 at 3 mA/cm2, and retaining their specific capacitances by 86.9 and 69.4%, respectively, after 4,000 cycles with 100% Coulombic efficiency. These materials have the potential to be employed for energy production and storage because of their excellent electrochemical characteristics and bifunctional performance.

Bifunctional P-Intercalated and Doped Metallic (1T)-Copper Molybdenum Sulfide Ultrathin 2D-Nanosheets with Enlarged Interlayers for Efficient Overall Water Splitting.

Metallic (1T) molybdenum disulfide (MoS2) is a much better electrocatalyst than the semiconducting (2H) MoS2 because of its superior conductivity, presence of active basal planes, and bulky interlayers. However, the lack of thermodynamic stability has hindered its practical uses. The insertion of transition metals and nonmetals in the interlayers and the crystal is known to improve both the thermodynamic stability and the catalytic efficacy of 1T-MoS2. In this study, for the first time we have developed an electrocatalyst for water splitting based on metallic copper molybdenum sulfide (1T-CMS). The present catalyst, P-doped and intercalated 1T-CMS ultrathin 2D nanosheets on carbon cloth (P-1T-CMS@CC), demonstrates excellent catalytic efficacy for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). It required an overpotential of 95 mV for HER and of 284 mV for OER at a current density of 10 mA cm-2. The P-1T-CMS@CC(+ -) device also shows excellent performance, requiring a cell voltage of only 1.51 V at a current density of 10 mA cm-2.

An Integrated Cathode Engineered by Hierarchical Honeycomb-Like Copper-Molybdenum Sulfide Nanosheets for Hybrid Supercapacitor with Improved Energy Storage Capability

An Integrated Cathode Engineered by Hierarchical Honeycomb-Like Copper-Molybdenum Sulfide Nanosheets for Hybrid Supercapacitor with Improved Energy Storage Capability

An Integrated Cathode Engineered by Hierarchical Honeycomb-Like Copper-Molybdenum Sulfide Nanosheets for Hybrid Supercapacitor with Improved Energy Storage Capability

An Integrated Cathode Engineered by Hierarchical Honeycomb-Like Copper-Molybdenum Sulfide Nanosheets for Hybrid Supercapacitor with Improved Energy Storage Capability

An Integrated Cathode Engineered by Hierarchical Honeycomb-Like Copper-Molybdenum Sulfide Nanosheets for Hybrid Supercapacitor with Improved Energy Storage Capability

An Integrated Cathode Engineered by Hierarchical Honeycomb-Like Copper-Molybdenum Sulfide Nanosheets for Hybrid Supercapacitor with Improved Energy Storage Capability

MXene-supported copper-molybdenum sulfide nanostructures as catalysts for hydrogen evolution

The synthesis and enhanced HER performance of Cu2MoS4/Ti3C2Tx-30% was demonstrated.

The depression behavior and mechanism of tragacanth gum on chalcopyrite during Cu-Mo flotation separation

In this work, tragacanth gum (TG), a nontoxic and environmental friendly organic polymer, was used to replace the traditional inorganic depressants of chalcopyrite during the flotation separation of copper-molybdenum sulfides. The single mineral flotation and artificial mixed minerals flotation experiments were conducted to investigate the effect of TG on flotation separation behaviour of molybdenite and chalcopyrite. The TG’s adsorption mechanism on molybdenite and chalcopyrite was investigated by X-ray photoelectron spectroscopy (XPS) and Time-of-flight secondary ion mass spectrometry (ToF-SIMS). The flotation experiment results showed that at pH 3–8, TG had a significant selective depressive effect on chalcopyrite flotation and it was enhanced with increasing TG concentration, but hardly affected the molybdenite flotation. XPS analysis showed that TG was chemically adsorbed on both molybdenite and chalcopyrite surfaces and ToF-SIMS results demonstrated that the interaction of TG and chalcopyrite was stronger than that of TG and molybdenite. Further, XPS narrow scanning analysis suggested that TG might chemisorb onto chalcopyrite via chemical bond between the carboxyl groups and Fe sites on bulk chalcopyrite surface as well as the hydrogen bond between the hydroxyl groups and surface Fe oxides/hydroxides. The strong TG adsorption on chalcopyrite hindered the subsequent adsorption of PBX on chalcopyrite surface, thus chalcopyrite was significantly depressed and Cu-Mo flotation separation was achieved.

Bifunctional CuMoS4 for Green Energy Production

The growing need for energy and sustainability issues demand green energy production. Research in this field needs better materials that can efficiently produce energy. Modified electrode materials with better electrochemical properties that can work as bifunctional materials to produce energy are much needed. In this work, copper-molybdenum sulfide synthesized using a self-assembled synthetic route was dip-coated onto nickel foam for energy generation (hydrogen and oxygen via water splitting). For water splitting applications, CuMoS4 displayed an overpotential of 207 mV to reach a current density of 10 mA/cm2 for hydrogen evolution reaction (HER). The Tafel slope associated with the HER activity of this material was 118 mV/dec. The overpotential needed to reach a current density of 10 mA/cm2 for oxygen evolution reaction (OER) was 270 mV. The OER activity of copper-molybdenum sulfide showed a Tafel slope of 82 mV/dec. Moreover, the material showed great stability over a long period water splitting reaction. CuMoS4 produced results comparable to many other materials in literature and has promising results for applications for water splitting.

Near-Infrared-Active Copper Molybdenum Sulfide Nanocubes for Phonon-Mediated Clearance of Alzheimer's β-Amyloid Aggregates.

Ternary chalcogenide materials have attracted significant interest in recent years because of their unique physicochemical and optoelectronic properties without relying on precious metals, rare earth metals, or toxic elements. Copper molybdenum sulfide (Cu2MoS4, CMS) nanocube is a biocompatible ternary chalcogenide nanomaterial that exhibits near-infrared (NIR) photocatalytic activity based on its low band gap and electron-phonon coupling property. Here, we study the efficacy of CMS nanocubes for dissociating neurotoxic Alzheimer's β-amyloid (Aβ) aggregates under NIR light. The accumulation of Aβ aggregates in the central nervous system is known to cause and exacerbate Alzheimer's disease (AD). However, clearance of the Aβ aggregates from the central nervous system is a considerable challenge due to their robust structure formed through self-assembly via hydrogen bonding and side-chain interactions. Our spectroscopic and microscopic analysis results have demonstrated that NIR-excited CMS nanocubes effectively disassemble Aβ fibrils by changing Aβ fibril's nanoscopic morphology, secondary structure, and primary structure. We have revealed that the toxicity of Aβ fibrils is alleviated by NIR-stimulated CMS nanocubes through in vitro analysis. Moreover, our ex vivo evaluations have suggested that the amount of Aβ plaques in AD mouse's brain decreased significantly by NIR-excited CMS nanocubes without causing any macroscopic damage to the brain tissue. Collectively, this study suggests the potential use of CMS nanocubes as a therapeutic ternary chalcogenide material to alleviate AD in the future.

Tiopronin as a novel copper depressant for the selective flotation separation of chalcopyrite and molybdenite

In this work, an environmental-friendly surfactant named tiopronin was tested as a novel copper depressant in copper-molybdenum sulfide separation for the first time. The separation performances were evaluated by micro-flotation and the depression mechanism was revealed by means of Zeta potential, Scanning Electron Microscope and Energy Dispersive Spectrometer (SEM-EDS), X-ray Photoelectron Spectroscopy (XPS) and Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) measurements. The micro-flotation tests demonstrated that tiopronin exhibited powerful depressing effect on chalcopyrite and it could achieve satisfactory separation results with high selectivity in wide pH range. The novel depressant had promising application prospect due to its high selectivity and low toxicity in compared with conventional one. Zeta potential, SEM-EDS, XPS and ToF-SIMS measurements manifested that tiopronin was chemisorbed on chalcopyrite surface through the strong chemical reaction of copper sites with CO and SH groups in tiopronin molecular to form five-membered chelating rings. In addition, a possible depression model was proposed.

Efficient electrochemical water splitting using copper molybdenum sulfide anchored Ni foam as a high-performance bifunctional catalyst

A self-powered water electrolyzer system was constructed via integration of a solar cell with the fabricated CMS/Ni electrolyzer (acts as both anode (OER) and cathode (HER), which demonstrated potential application towards next-generation energy conversion and management systems.