JOURNAL OF CATALYSIS
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2023
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IF 7.3
Hao Zhang,Qing Zhang,Guang-Ren Qian,Hong Liu,Jia Zhang,Yang Yue,Chen-Qi Gao,Wen-ying Li,Rui-Sen Jing
A series of new NiS 2 -MoS 2 - x ( x = 0–0.5) sphere-flower hybrids with different Ni/Mo molar ratios, synthesized via a one-pot hydrothermal method, were used as catalysts for hydrodesulfurization (HDS) of thiophene (TP) and 4,6-dimethyl-dibenzothiophene (4,6-DMDBT). The characterizations show that the microstructure of MoS 2 , including the size of MoS 2 nano-flowers, the length of MoS 2 slabs, and the number of defects, was regulated by changing Ni/Mo ratios. Increasing the Ni/Mo ratio in the NiS 2 -MoS 2 - x catalysts significantly boosts their HDS activity, with the optimum ratio being 0.2. In addition, the NiS 2 -MoS 2 -0.2 catalyst exhibits the best direct desulfurization performance, which is associated with the minimum ratio of average slab length ( L av ) to average stacking number ( N av ) as well as the highest concentration of Ni-promoted Mo sites and sulfur vacancies. Moreover, Ni-containing NiS 2 -MoS 2 - x catalysts, characterized by a highly stable sphere-flower configuration, exhibit superior structural stability and catalytic durability than the Ni-free NiS 2 -MoS 2 -0 catalyst.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yiming Tang,Zexiao Zheng,Xianglin Sun,Xukai Li,Laisheng Li
Ternary CdS-MoS 2 coated ZnO nanobrush photoelectrode from chemical bath deposition was successfully fabricated on a FTO substrate for photocatalytic degradation of amoxicillin. The vertically grown ZnO core on FTO substrates provided a direct pathway for electron transfer; while the well-crystallized CdS/MoS 2 shell offered effective visible light absorption and increased active sites. Prolonged lifetime of charge carriers was demonstrated by transient photovoltage (TPV) measurement. The ternary brush-type electrode exhibited enhanced photoelectrochemical performance with a photocurrent density of 20.32 mA/cm 2 at 0 V vs . Ag/AgCl under visible light illumination (λ ≧ 420 nm), which was 5.2 times, 1.8 times and 3.6 times of that of pristine CdS, CdS-MoS 2 film and ZnO/CdS nanobrush, respectively. The improved photoelectrochemical activity was ascribed to the enhancement of light absorption, appropriate band alignment and prolonged charge carriers’ lifetime. The ZnO/CdS-MoS 2 nanobrush film degraded 94% of amoxicillin in 60 min, exhibiting promising photocatalytic activity under visible light illumination (λ ≧ 420 nm). The reusability and stability of the electrode were evaluated by recycling experiments. The intermediates of amoxicillin oxidation were also identified and the degradation pathway was proposed.
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Small
·
2023
·
IF 13.3
Mengxia Shen,Jiale Qi,Xinyu Xu,Jinbao Li,Yongjian Xu,Hao Yang,Kun Gao,Jianfeng Huang,Jiayin Li,Zhen Shang,Yonghao Ni
Multi-component composite materials with a magnetic-dielectric synergistic effect exhibit satisfactory electromagnetic wave absorption performance. However, the effective construction of the structure for these multi-component materials to fully exploit the advantages of each component remains a challenge. Inspired by natural biomass, this study utilizes wood as the raw material and successfully prepares high-performance MoS 2 @Gd 2 O 3 /Mxene loaded porous carbon aerogel (MGMCA) composite material through a one-pot hydrothermal method and carbonization treatment process. With a delicate structural design, the MGMCA is endowed with abundant heterogeneous interface structures, favorable impedance matching characteristics, and a magnetic-dielectric synergistic system, thus demonstrating multiple electromagnetic wave loss mechanisms. Benefiting from these advantages, the obtained MGMCA exhibits outstanding electromagnetic wave absorption performance, with a minimum reflection loss of −57.5 dB at an ultra-thin thickness of only 1.9 mm. This research proposes a reliable strategy for the design of multi-component composite materials, providing valuable insight for the design of biomass-based materials as electromagnetic wave absorbers.
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PubMed
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 48
·18342-18353
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IF 4
Minghao Dou,Mengjie Yao,Kai Ding,Yuye Cheng,Hongyu Shao,Shenjie Li,Yanyan Chen
Heterostructures formed by combining semiconductor materials with different band structures can provide work functions, d-band positions and electronic properties different from bulk materials and are considered as an effective strategy to improve the catalytic activity through electronic modification. In this study, an efficient MoS2/Fe-Ni3S2/NF heterojunction material was prepared by a two-step hydrothermal method. With the help of flake Ni(OH)2 synthesized in the first step, growth sites were provided for flake Ni3S2. The electronic structure of Ni3S2 was optimized by Fe doping, while the construction of the MoS2/Fe-Ni3S2 heterostructure allowed the catalyst to expose more active sites. MoS2/Fe-Ni3S2/NF exhibited a small charge transfer resistance and excellent electrocatalytic performance. At a current density of 10 mA cm−2, only low overpotentials of 148 mV and 118 mV were required for the oxygen precipitation reaction (OER) and hydrogen precipitation reaction (HER), respectively. Notably, when MoS2/Fe-Ni3S2/NF is used as the anode and cathode for overall hydrolysis, only 1.51 V is required to reach a current density of 10 mA cm−2, demonstrating its great potential for application in hydrolysis. This work provides a feasible idea for the rational construction of non-precious metal bifunctional electrocatalysts with excellent performance.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 47
·期 48
·22050-22062
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IF 3.3
Hui-Qin Zheng,Wen-Li Zhang,Min-Cai Yin,Yao-Ting Fan
In the present work, a ternary composite MoS2/soluble g-C3N4/CdS was synthesized using a facile one-pot hydrothermal reaction and conventional reflux reaction method. The composition, morphology, and properties of the ternary composite were characterized. The photocatalytic performance of the ternary composite was evaluated for hydrogen generation under LED lamp irradiation (450 nm < λ < 465 nm) with lactic acid (LA) used as a sacrificial reagent. The results demonstrated that the maximum hydrogen production reached 4869.6 μmol under the optimal hydrogen production conditions, including a composition of 20% soluble g-C3N4, 9% MoS2, a solution pH of 1, and an irradiation time of 6 hours. The corresponding hydrogen production rate for the ternary composite was calculated to be 8116 μmol g−1 h−1. Furthermore, a possible electron transfer mechanism of the ternary composite system was briefly explored. The interaction and synergistic effects between MoS2, soluble g-C3N4, and CdS in the ternary composite likely facilitate efficient electron transfer, resulting in enhanced photocatalytic activity for hydrogen production. Mechanistic research showed that the electron transfer pathway represented either a double or single type II heterojunction photocatalytic system.
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FlatChem
·
2023
·
IF 6.2
Chou-Kun Tang,Xi Zheng,Xiao-Liang Chen,Yu-Gang Fu,Qiu-Feng Lü
Electrocatalytic hydrogen production is an effective way to produce hydrogen energy, and the key is to find inexpensive and effective catalysts. Loading transition metal sulfides onto two-dimensional transition metal carbide (MXene) is an effective method to prepare cheap and high-performance hydrogen evolution reaction (HER) catalysts. In this study, Mo 2 TiAlC 2 was etched with hydrofluoric acid to prepare Mo 2 TiC 2 T x MXene, which was then composited with MoS 2 and CoS 2 to prepare defect-rich MoS 2 /CoS 2 @Mo 2 TiC 2 T x composite by a hydrothermal method. MoS 2 /CoS 2 provides a large number of active sites for electrocatalysis, while Mo 2 TiC 2 T x MXene as a carrier not only provides nucleation and growth sites for MoS 2 /CoS 2 , but also increases the rate of electron transfer in HER process, which achieves good synergy between MoS 2 /CoS 2 and Mo 2 TiC 2 T x MXene. Consequently, MoS 2 /CoS 2 -2@Mo 2 TiC 2 T x exhibits an excellent HER performance. When the current density reaches 10 mA cm −2 , the optimal MoS 2 /CoS 2 -2@Mo 2 TiC 2 T x catalyst only requires an overpotential of 80 mV, and exhibits good cycling stability and durability. This work gives a new idea for the preparation of efficient HER catalysts using non-precious metal composites to replace the precious Pt/C.
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Foods
·
2023
·Vol. 12
·期 23
·4363
·
IF 5.2
Zhiping Yu,Chengqiang Li,Jiashuai Sun,Xia Sun,Guodong Hu
The accumulation of pesticide residues poses a significant threat to the health of people and the surrounding ecological systems. However, traditional methods are not only costly but require expertise in analysis. An electrochemiluminescence (ECL) aptasensor was developed using chitosan and molybdenum disulfide (CTS-MoS2), along with acetylene black (AB@CTS) for the rapid detection of malathion residues. Due to the weak interaction force, simple composite may lead to uneven dispersion; MoS2and AB were dissolved in CTS solution, respectively, and utilized the biocompatibility of CTS to interact with each other on the electrode. The MoS2nanosheets provided a large specific surface area, enhancing the utilization rate of catalytic materials, while AB exhibited excellent conductivity. Additionally, the dendritic polylysine (PLL) contained numerous amino groups to load abundant luminol to catalyze hydrogen peroxide (H2O2) and generate reactive oxygen species (ROS). The proposed ECL aptasensor obtained a low detection limit of 2.75 × 10−3ng/mL (S/N = 3) with a good detection range from 1.0 × 10−2ng/mL to 1.0 × 103ng/mL, demonstrating excellent specificity, repeatability, and stability. Moreover, the ECL aptasensor was successfully applied for detecting malathion pesticide residues in authentic samples with recovery rates ranging from 94.21% to 99.63% (RSD < 2.52%). This work offers valuable insights for advancing ECL sensor technology in future applications.Keywords:electrochemiluminescence;aptamer;CTS-MoS2;AB@CTS;PLL-luminol;nano gold
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaofu Tang,Yan Liang,Shengjing Guan,Lichun Xu,Meiyu Zhu,Wenmin Guo,Lihua Zou,Changlong Sun,Fuzhou Chen
Metallic phase molybdenum disulfide (1 T MoS 2 ) is one of the most promising anode materials for lithium-ion batteries. The 1 T MoS 2 is metastable and synthesis of 1 T MoS 2 without harsh and hazardous conditions is remain challenging. In this work, stable 1 T MoS 2 is prepared by the hydrothermal method utilizing the boron nitride co-doping graphite (BNG) nanosheets as substrates. The doping strategy changed the electron states in the graphite realizing the electron redistribution when combined with MoS 2 . The BNG nanosheets act as the electron donor stabilizing the 1 T MoS 2 and guiding the vertical growth of the MoS 2 without agglomeration. As a result, the as-prepared BNG-MoS 2 presents an outstanding lithium storage performance of 1056.3 mAh/g after 500 cycles and 248.3 mAh/g of capacity at a high rate of 20 A/g after 2000 cycles. Electrochemical measurements indicate the enhanced lithium storage kinetics is derived from the elevated electron conductivity and lithium-ion migration. The DFT calculation further confirms the origin of the phase transition and fast lithium storage kinetics is the electron redistribution at the interface of BNG-MoS 2 . This novel strategy gives a new perspective on the synthesis of stable 1 T phase MoS 2 for advanced anode materials.
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ChemistrySelect
·
2023
·Vol. 8
·期 34
·e202300119
·
IF 2.1
Yu Liu,Taojun Wang
Graphical The natural wood and MoS 2 are combined to construct composites, which can be used for highly efficient removing organic pollutants from water under light irradiation in virtue of synergistic effect of adsorption and photocatalysis mechanism. Organic dye-contained wastewater is a major threat to the global environment and public health. In this study, natural wood and MoS 2 are combined to create effective photocatalysts for removing organic pollutants from water under light irradiation. The results show that the photocatalytic degradation activity of wood/MoS 2 composites are obviously superior to that of natural wood under solar light as well as possess outstanding stability after three reaction cycles. The improvement in photocatalytic performance for photodegradation is primarily due to an increase in specific surface area and the introduction of catalytic active sites from the edge S, which favors adsorption of organic pollutants and accelerates the degradation process. The synergistic effect of adsorption and photocatalysis also ensures that the composited catalyst is highly universal in its application to organic dye degradation, including RhB (Rhodamine B), MB (Methylene Blue), and MO (Methyl Orange); the kinetic constant for the photocatalytic degradation of RhB, MO, and MB are 0.040, 0.035, and 0.032 min −1 , respectively and the degradation performance can be well maintained after three cycle tests. Our study has proved that the wood/MoS 2 composite is a novel, low-cost photocatalyst that plays an important role in environmental protection.
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ENERGY & FUELS
·
2023
·
IF 5.3
Jun Tang,Jinzhao Huang,Sixuan Zhang,Zehui Liu,Xiaolong Deng
Metal-phase MoS2 (1T-MoS2) is considered a promising candidate as a catalyst for the hydrogen evolution reaction (HER). However, the instability of 1T-MoS2 limits its electrocatalytic activity. Herein, we first synthesized 1T-MoS2 with excellent HER catalytic performance by a simple one-pot hydrothermal strategy of introducing the d-electron-rich transition metal atom Ni into MoS2. A bimetallic monatomic catalyst (Pt@1T-MoS2–Ni) was also prepared by modifying 1T-MoS2–Ni with Pt single atoms (Pt SAs). Experiments show that the electron transfer caused by Ni doping leads to the 1T phase transition, and the modification of Pt SAs further improves the electrical conductivity. These two factors synergistically modulate the electronic composition of MoS2 and increase the number of reactive sites. In consequence, the Pt@1T-MoS2–Ni catalyst exhibits significantly enhanced HER activity, achieving an overpotential as low as 76 mV at 10 mA/cm2 with the corresponding Tafel slope of only 46 mV/dec. Moreover, the current attenuation is negligible within 12 h, surpassing the performance of MoS2. This study offers ideas for improving the efficiency and stability of 1T-MoS2 catalyst designs.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Jianjun Zhu,Xinyu Zheng,Yikai Lu,Huamei Tong,Mengyue Qi,Yu Liu,Di Li,Deli Jiang
The construction of multicomponent coupled interfaces is crucial to designing highly effective and robust bifunctional electrocatalysts for water splitting. Transition metal sulfides are widely applied as efficient catalysts, but building strong coupling interfaces to enhance electrocatalytic properties remains a tremendous challenge. Here, we reported a distinctive heterostructure electrocatalyst consisting of conductive polypyrrole (PPy)-decorated cobalt–molybdenum sulfide (CoS2/MoS2) nanosheets supported on nickel foam (CoS2/MoS2@PPy/NF) using a simple two-step hydrothermal and subsequent electrodeposition approach. Experimental results reveal that the interfacial coupling and synergistic effect between the conductive PPy and CoS2/MoS2 with tunable electronic configuration are favorable for the charge transport and the electronic structure optimization of the coupled interface, where this integrated PPy can improve the conductivity and offer a guarantee for the durability of CoS2/MoS2@PPy/NF. Density functional theory (DFT) calculations verify that electronic interaction and charge redistribution in heterogeneous CoS2/MoS2 can flexibly adjust the interfacial electronic configuration and lower the d-band center. Thanks to the advantages mentioned above, the obtained CoS2/MoS2@PPy/NF exhibits outstanding catalytic properties with the overpotentials of 46 mV for the hydrogen evolution reaction (HER) and 231 mV for the oxygen evolution reaction (OER) at 10 mA cm–2. Remarkably, assembled CoS2/MoS2@PPy/NF || CoS2/MoS2@PPy/NF only acquires 1.52 V at 10 mA cm–2 in 1.0 M KOH with a durability of 50 h. This study affords a significant reference for designing bimetallic sulfide/polymer catalysts toward high-efficiency overall water splitting.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Hao Lin Zou,Ling Yun Qin,Hong Qun Luo,Bang Lin Li,Nian Bing Li
Semiconducting MoS 2 obtained from the liquid-phase exfoliation is oxidized at the potentials higher than 0.65 V via applied electrochemical processes, and high-valence Mo(VI) are formed. The oxidized MoS 2 exhibits comparable performance to the electrochemical oxidation of nitrite, promoting the construction of sensors based on the assembly of nanomaterials. The signal amplification mechanism is exploited, and enhanced sensing responses are confirmed considering the strong coupling effect of Mo(VI) to nitrite. In order to optimize the sensing performance, the measurement parameters including the pH of buffer solutions, scan rates, and modification conditions are discussed. The cyclic voltammetry and chronoamperometry are successfully employed, and the oxidized MoS 2 performs satisfactory linear relationship to nitrite concentrations ranging from 1.0 μM to 386.0 μM, with the detection limit of 0.028 μM. The oxidation state and enhanced electrochemical responses of semiconducting MoS 2 as well as the developed nitrite sensing strategy inspire emerging characteristics of layered nanostructures and achieve the high potential in practical environmental and food safety monitoring.
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危险品化学品经营许可证（带存储）