JOURNAL OF MOLECULAR LIQUIDS
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2019
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IF 4.561
Zhigang Yin,Longhua Xu,Jianyong He,Houqin Wu,Shuai Fang,Sultan Ahmed Khoso,Yuehua Hu,Wei Sun
Herein, we employed a range of instrumental techniques to investigate the performance of l -cysteine as a biodegradable and selective depressant in the flotation separation of molybdenite (MoS 2 ) from galena (PbS), demonstrating that this amino acid exhibited a superior depressing efficiency toward PbS and enabled the separation of the above minerals under alkaline conditions. In the presence of l -cysteine, the zeta potentials of PbS shifted to more negative values, which was indicative of chemisorption . Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy measurements indicated that the above chemisorption involved the formation of a five-membered chelate ring via coordination of Pb by S (–SH) and N (–NH 2 ) atoms, as was further confirmed by time-of-flight secondary ion mass spectrometry measurements. Moreover, the detection of l -cysteine dimer on the surface of PbS was ascribed to the occurrence of oxidation processes. The predicted adsorption modes suggested an appreciable extent of surface interaction between l -cysteine and PbS, whereas density functional theory calculations demonstrated that the interaction between l -cysteine and the PbS (100) slab corresponds to both physical and chemical adsorption.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Yongkang Liu,Bin Hu,Shide Wu,Minghua Wang,Zhihong Zhang,Bingbing Cui,Linghao He,Miao Du
We have explored a nanocomposite composed of a bimetallic CoNi-zeolitic imidazole framework embedded by MoS 2 nanosheets (MoS 2 @CoNi-ZIF), as a bifunctional electrocatalyst for non-Pt methanol oxidation reaction (MOR) and overall water splitting in an alkaline solution. The series of MoS 2 @CoNi-ZIF nanocomposites exhibit different catalytic activities. Significantly, the MoS 2 @CoNi-ZIF nanosheet with a ratio of MoS 2 :CoNi-ZIF = 3:1 (MoS 2 @CoNi-ZIF(3-1)) shows the excellent electrocatalytic activity for MOR, affording an oxidation potential at 1.6 V, also with high catalytic current density and durability. Moreover, the MoS 2 @CoNi-ZIF(3-1) nanocomposite shows a superior electrocatalytic performance toward HER and OER. When the MoS 2 @CoNi-ZIF(3-1) was applied as the bifunctional catalyst for both the anode and cathode, the voltage applied to a two-electrode cell is 1.55 V to achieve a current density of 10 mA cm −2 for overall water splitting. This work provides a promising electrocatalyst for developing high-performance non-Pt-based clean energy and fuel cells in alkaline solution.
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ELECTROCHIMICA ACTA
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2018
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IF 5.116
Ling Li,Xue Zhang,Dongyang Wang,Wenming Zhang,Xiaowei Li,Xiaohui Zhao,Qinghua Zhang,Lin Gu,Ze Yu,Mingxing Wu
Molybdenum sulfide/carbon nanofibers (MoS 2 /CNFs) composite with high density of flower-like nanosheets are prepared via the combination of electrospinning technology and hydrothermal method . The MoS 2 /CNFs composite exhibits good performance as a counter electrode (CE) in dye-sensitized solar cells (DSSCs). The DSSCs employing MoS 2 /CNFs delivers a power conversion efficiency (PCE) of 8.46%, which is higher than that of the devices with CNFs CE (6.59%) and platinum CE (7.65%) under the same conditions. Thus, the excellent stability and facile preparation of the MoS 2 /CNFs electrode provide precondition for DSSCs application, while greatly enhancing the electrocatalytic activities of the DSSCs.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2014
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IF 2.93
Weijia Han,Chen Zang,Zongyu Huang,Han Zhang,Long Ren,Xiang Qi,Jianxin Zhong
A novel graphene-based three-dimensional (3D) aerogel embedded with two types of functional nanomaterials had been prepared by a facile one-pot hydrothermal process. During the hydrothermal reaction , graphene, TiO 2 nanoparticles and MoS 2 nanosheets were self-assembled into the 3D interconnected networks aerogel, where the uniformly dispersed TiO 2 nanoparticles were densely anchored onto the graphene nanosheets and decorated with the ultrathin MoS 2 nanosheets. The UV–vis DRS and PL spectra measurement shows that the MoS 2 /P25/graphene aerogel exhibits enhanced light absorption and efficient charge separation properties. As a new photocatalyst , the photocatalytic activity was evaluated by photoelectrochemical test and photodegradation methyl orange (MO) under UV irradiation , an improvement of photocurrent was observed, as 6 times higher for MoS 2 /P25/graphene aerogel (37.45 mA/cm 2 ) than pure P25 at +0.6 V, and the fastest photodegradation of MoS 2 /P25/graphene aerogel was found within 15 min. The improved photocatalytic activity is attributed to the porous structure , good electrical conductivity and the maximization of accessible sites of the unique 3D graphene aerogel, the increasing active adsorption sites and photocatalytic reaction centers for the introduction of MoS 2 nanosheets, and the positive synergetic effect between the three components in this hybrid. This work demonstrates that the as-prepared MoS 2 /P25/graphene aerogel may have a great potential application in photoelectrochemical hydrogen production and pollution removal.
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Inorganic Chemistry Frontiers
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2017
·Vol. 4
·期 4
·683-691
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IF 4.036
Xiongwei Wang,Ludan Zhang,Peiyi Wu
In this work, a novel nanocomposite with few-layered ultrasmall MoS2 nanosheets uniformly anchored on a three-dimensional (3D) flower-like carbon (FC) was designed and prepared, where zinc oxide was used as a sacrificial template to prepare a biomass-based FC skeleton by a hydrothermal method and subsequent high-temperature carbonization. When evaluated as an anode material for lithium ion batteries (LIBs), the three-dimensional FC matrix can not only improve the electronic conductivity of the hybrid, but also enable fast electrolyte diffusion to MoS2. The FC–MoS2 hybrid exhibits a high second reversible capacity of 1033 mA h g−1 at 0.2 A g−1, excellent cycling stability with negligible capacity loss after 200 cycles at 1.6 A g−1, and good rate performance. Additionally, the hybrid also shows enhanced electrocatalytic performance for hydrogen evolution. We believe that our method may provide a cost-effective and eco-friendly route to prepare 3D biomass-based composites for energy generation or storage.
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Journal of Materials Chemistry A
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2016
·Vol. 4
·期 36
·13980-13988
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IF 8.262
Zhibin Fang,Xueyan Huang,Yaozhu Wang,Wenhui Feng,Yan Zhang,Sunxian Weng,Xianzhi Fu,Ping Liu
Defective MoS2 nanosheets have been demonstrated to be a superior catalyst for hydrogen evolution; however, mediocre interfacial contact between the MoS2 cocatalyst and the light harvester still impedes the pursuit of composite photocatalyst systems with highly efficient performance. Herein, we propose a dual-defective assembly methodology following the chemical similarity principle to construct effectively-binding MoS2/In2S3 photocatalysts, in which luxuriant defects on layered In2S3 nanosheets serve as in situ growth sites for defective MoS2 layers with abundant exposed edges. The resulting dual-defective system is endowed with improved separation of electron–hole pairs, beneficial interfacial migration and utilization of electrons, and decreased photocorrosion from holes. By this method, the system achieves dramatically enhanced hydrogen evolution activity as well as considerable stability. The imperfections in both MoS2 and In2S3 are indispensable for desirable performance. The present strategy can not only direct the manufacture of defective MoS2-incorporated photocatalysts but may also contribute to the design of other highly active cocatalyst/light harvester systems with effective interfacial contacts.
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CHEMICAL ENGINEERING JOURNAL
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2016
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IF 5.31
Yongbing Lou,Dan He,Zhifei Wang,Yuhang Hu,Ying Shen,Jing Ming,Jinxi Chen
A novel nanocomposite, ultrasmall Co 3 O 4 nanoparticles decorated on ultrathin surface of MoS 2 nanosheets, namely MoS 2 /Co 3 O 4 , was synthesized as an anode material for lithium ion battery. The discharge capacity of MoS 2 /Co 3 O 4 nanocomposite reached 1100.0 mAh g −1 after 50 cycles at 200 mA g −1 , much higher than the pure Co 3 O 4 nanoparticles. Moreover, it could maintain reversible capacity of 946.6 mAh g −1 even after 50 cycles at a high current density of 500 mA g −1 . While increasing the current densities step by step from 100 to 200, 500, and 800 mA g −1 , the capacities of MoS 2 /Co 3 O 4 nanocomposite are 1474.9, 1209.9, 952.6 and 801.9 mAh g −1 , respectively. The excellent electrochemical performance resulted from the designed nanocomposite composed of uniformly distributed ultrasmall Co 3 O 4 nanoparticles and ultrathin MoS 2 nanosheets, which maximally utilized electrochemical active MoS 2 nanosheets and Co 3 O 4 nanoparticles for lithium ion batteries. Moreover, this composite structure may provide more extra spaces for the storage of lithium ions and help to accommodate the volume change through a synergistic interaction between two active materials.
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JOURNAL OF MEMBRANE SCIENCE
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2024
·
IF 8.4
Qing Fang,Qin Liu,Zongli Xie,Matthew R. Hill,Kaisong Zhang
Solvent-resistant nanofiltration membranes , capable of breaking “trade-off” between permeability and selectivity while resisting physical aging, hold crucial utility in developing advanced membrane materials and reducing energy consumption associated with solvent recovery. Herein, the development of scalable, mixed matrix membranes (MMMs) was presented based on polysulfone (PSf) substrate with ultra-high permeability and aging resistance. The upper selective layer was composed of poly-trimethylsilylpropyne (PTMSP) and two types of nano-fillers, namely poly-dichloroxylene ( p -DCX) and sodium dodecylbenzene sulfonate-molybdenum sulfide (SDBS-MoS 2 ). Under the influence of the additives, the redistribution of the free volume of the polymer as well as the internal spaces within additives creates additional pathways for solvent diffusion, thus increasing solvent permeance. Additionally, the combined effect of the two additives is likely to inhibit filler agglomeration and improve the overall effectiveness of the additives. Compared to pure PTMSP membranes, the p -DCX/SDBS-MoS 2 PTMSP MMMs exhibited enhanced methanol permeance (10.58 vs. 3.14 L m −2 h −1 bar −1 ) and RB rejection (99.23 vs. 96.13 %), which greatly exceeded that of current OSN MMMs. As anticipated, aging of the prepared membranes decelerated with the addition of the additives, and the methanol permeation loss rate decreased from 50.32 % to 13.23 % after 300 h. Molecular dynamics simulations explored by structural analysis revealed the mechanism for the significant improvement in methanol permeance and aging resistance. The membranes obtained were found to be highly industrially applicable, thereby offering the potential to reduce operation costs in energy-intensive separation processes.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Chang Xi,Wenxiu Xu,Shaobo Zhou,Yucheng Wang,Sheng Han,Jibo Jiang
The construction of non-uniform interfaces with inert metal-free electroactive materials is essential to achieve rapid kinetics and high ion/electron transfer rates for HER. Herein, an efficient synthesis strategy is employed, which is the construction of single-atom phosphorus-doped MoS 2 nano-arrays on nitrogen-doped graphene oxide aerogel (P–MoS 2 /NGA), providing a good guarantee for rapid charge transfer and the long-term stability by preventing the massive accumulation of P–MoS 2 . Benefiting from this strategy, the optimized catalyst (P–MoS 2 /NGA) with more surface active sites exhibited unexpected hydrogen precipitation reaction (HER) activity. A current density of 10 mV cm -2 was achieved in 1.0 M KOH with a voltage of only 79 mV and a Tafel slope dec -1 of 97 mV. Density Functional Theory (DFT) confirms the formation of strong P 2p-S 2p-Mo 3d hybridization at the Fermi energy level, resulting in deeper d-band centers and more optimized hydrogen adsorption sites. Therefore, P–MoS 2 nanosheets/nitrogen-doped graphene 3D hybrid aerogel has great potential to become excellent electrochemical hydrogen precipitation material.
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MICROCHEMICAL JOURNAL
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2024
·
IF 4.9
Haiyan Zhao,Yi Zhou,Shanshan Li,Kemei Shi,Na Li,Min Cui,Cong Zhang
Hydrogen peroxide (H 2 O 2 ) is an important reactive oxygen species, and its abnormal concentration can cause cell distortion and apoptosis, leading to occurrence of various diseases. Therefore, real-time and sensitive monitoring of H 2 O 2 is essential for early disease diagnosis and pathological research. Herein, a novel nanocomposite of Fe-porphyrin covalent organic frameworks decorated with molybdenum disulfide and multi-walled carbon nanotubes (Fe-pCOFs/MoS 2 -MWCNTs), which had glorious enzyme-like activity, was reported for efficient electrochemical detection of H 2 O 2 . The prepared Fe-pCOFs nanosheets with a large specific surface area and fully dispersed Fe 2+ active sites, could enhance mass transfer and atomic utilization, thereby contributing to excellent catalytic efficiency toward H 2 O 2 . The flower-like MoS 2 nanoflakes not only could catalyze the reduction reaction of H 2 O 2 , but also could serve as co-catalyst and form a catalytic cycle with Fe 2+ of Fe-pCOFs, contributing the continuous emergence of catalytic active sites. The highly conductive MWCNTs was employed to promote electron transfer rate. Ultimately, the obtained Fe-pCOFs/MoS 2 -MWCNTs exhibited excellent electrocatalytic activity and conductivity, significantly amplifying the H 2 O 2 response signal. Under the optimal conditions, the sensor had a wide detection range from 20 to 2650 μΜ for H 2 O 2 with a detection limit as low as 2.2 μΜ. Moreover, the sensor successfully recorded trace amounts of H 2 O 2 released from RAW264.7 cells, showing promising application for real-time and sensitive monitoring of H 2 O 2 in clinic or pathological research.
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Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Siyuan Diao,Lili Meng,Lanlan Feng
The application of peroxymonosulfate (PMS)-based advanced oxidation processes , facilitated by the incorporation of metal-deposited MoS 2 catalyst, has attracted considerable interest in recent years within the scientific community. Nevertheless, investigating the structure-performance relationship between MoS 2 and deposited metal still presents a formidable challenge, yet a highly desirable pursuit. In this study, a Cu-MoS 2 single-atom catalyst (SAC) was successfully synthesized by a photo-deposition method, wherein Cu ions were deposited on the MoS 2 surface. The Cu-MoS 2 /PMS system exhibits exceptional degradation performance for tetracycline (TC), with a removal efficiency reaching 96% at 60 min. Furthermore, the density functional theory (DFT) is applied to investigate the coordination microenvironment of the catalyst by depositing of Cu. Experimental and theoretical calculations results exhibit that, on one hand, the introduction of Cu decreases the adsorption energy barrier and enhances the adsorption capacity of the catalyst for PMS. On the other hand, the abundant presence of Cu on the surface of the MoS 2 facilitates an accelerated transfer of electron , availing the formation of reactive oxygen species (ROS) via the distinct pathway: MoS 2 → transition metal → PMS. Concurrently, the synergistic interaction between Mo and Cu expedites rapid valence evolution of Mo 4+ /Mo 5+ /Mo 6+ and Cu + /Cu 2+ , thereby further enhancing the PMS activation. Hence, adjusting the coordination microenvironment of the catalyst represents a promising strategy for enhancing the catalytic activity.
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Nanoscale Advances
·
2024
·Vol. 6
·期 24
·6386-6397
·
IF 4.6
Meng Wei,Hanqing Lu,Zhen Wang,Baowen Lu,Pengtao Wang,Xinxin Zhang,Bingjie Feng,Yingjie Xie,Tao Zhang,Guanghui Liu,Song Xu
The slow redox kinetics and shuttle effect of polysulfides severely obstruct the further development of lithium–sulfur (Li–S) batteries. Constructing sulfur host materials with high conductivity and catalytic capability is well acknowledged as an effective strategy for promoting polysulfide conversion. Herein, a well-designed MoS2 QDs-CNTs/S@Ni(OH)2 (labeled as MoS2 QDs-CNTs/S@NH) cathode was synthesized via a hydrothermal process, in which conductive polar MoS2 quantum dot-decorated carbon nanotube (CNT) networks coated with an ultrathin Ni(OH)2 layer acted as an efficient electrocatalyst. MoS2 QD nanoparticles with a high conductivity and catalytic nature can enhance the kinetics of polysulfide conversion, expedite Li2S nucleation, and decrease the reaction energy barrier. The thin outer Ni(OH)2 layer physically confines active sulfur and meanwhile provides abundant sites for adsorption and conversion of polysulfides. Benefiting from these merits, a battery using MoS2 QDs-CNTs/S@NH as the sulfur host cathode exhibits excellent electrochemical performances with rate capabilities of 953.7 mA h g−1 at 0.1C and 606.6 mA h g−1 at 2.0C. A prominent cycling stability of a 0.052% decay rate per cycle after 800 cycles is achieved even at 2C.
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