DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 48
·18342-18353
·
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
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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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 48
·22050-22062
·
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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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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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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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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ACS Omega
·
2021
·
IF 3.512
Xue Zhang,Juan Du,Dongping Wu,Xiaoyi Long,Dan Wang,Jianhua Xiong,Wanming Xiong,Xiaoning Liao
Carbendazim, a very common contamination to the traditional Chinese medicines (TCMs), has posed serious threat to the environment and human health. However, sensitive and selective detection of carbendazim (MBC) in the TCMs is a big challenge for their complex chemical constituents. In this work, a 0D/1D nanohybrid was developed by anchoring 1T-phased MoS2 quantum dots (QDs) over multiwall carbon nanotubes (MWCNTs) via a facile assembly method. High-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis (TGA) together with EIS reveal that the 1T-phased QDs can anchor over MWCNTs via van der Waals forces, and the anchoring improves the nanohybrid surface area and conductivity. Therefore, the electrochemical sensor fabricated based on the MoS2 QDs@MWCNT nanohybrid shows excellent catalytic activity to MBC oxidation. Under optimized conditions, the sensor presents a linear voltammetry response to MBC concentration from 0.04 to 1.00 μmol·L–1, a low detection limit of 2.6 × 10–8 mol·L–1, as well as high selectivity, good reproducibility, and long-term stability. Moreover, the sensor has been successfully employed to determine MBC in two typical TCMs and the obtained recoveries are in good accordance with the results achieved by HPLC, showing that the constructed sensor plate holds great practical application in MBC analysis with complex matrix.
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Small Methods
·
2023
·
IF 12.4
Wending Pan,Yulong Zhang,Kee Wah Leong,Yingguang Zhang,Jianjun Mao,Yifei Wang,Xiaolong Zhao,Shijing Luo,D.Y.C Leung
In recent years, there have been significant advancements in Al-ion battery development, resulting in high voltage and capacity. Traditionally, only carbon-based materials with layered structures and strong bonding capabilities can deliver superior performance. However, most other materials exhibited low discharge voltages of 1.4 V, especially in aqueous Al-ion battery systems lacking anion intercalation. Thus, the development of high-voltage cathode materials has become crucial. This study introduces 2D MoS 2 as a high-performance cathode for aqueous Al-ion batteries. The material's interlayer structure enables the intercalation of AlCl 4 − anions, resulting in high-voltage intercalation. The resulting battery achieved a high voltage of 1.8 V with a capacity of 750 mAh g −1 , contributing to a high energy density of 890 Wh kg −1 and an impressive retention rate of ≈100% after 200 cycles. This research not only sheds light on the high-voltage anion-intercalation mechanism of MoS 2 but also paves the way for the further development of advanced cathode materials in the field of Al-ion batteries. By demonstrating the potential of using 2D MoS 2 as a cathode material, this finding can lead to the development of more efficient and innovative energy storage technologies, ultimately contributing to a sustainable and green energy future.
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JOURNAL OF CATALYSIS
·
2023
·
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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JOM
·
2023
·Vol. 75
·期 12
·5167-5175
·
IF 2.6
Li Guanghui,Huang Jiahao,Sun Hu,Mang Changye,Hou Yanrui,Luo Jun
The novel one-step oxidation–volatilization process for separating MoO 3 from pelletized MoS 2 concentrate supported on a porous Al 2 O 3 -SiO 2 skeleton has been demonstrated to have superior diffusion efficiency compared to the traditional two-step oxidative roasting-sublimation approach. Optimal control of pellet phase and micro-structure evolutions is crucial for maintaining a stable and breathable pellet bed throughout the roasting process, which is essential for industrial application of the new process. This work determined the phase transformations of MoS 2 concentrate pellets during roasting, revealed the formation mechanisms of mullite whiskers from MoS 2 -Al 2 O 3 -SiO 2 system and thus achieved toughening control of roasted MoS 2 concentrate pellets with temperature programmed roasting (TPR). It is found that the intermediate product Al 2 (MoO 4 ) 3 can induce the low-temperature formation of mullite whisker. With TPR, the volatilization rate of molybdenum is 97.2%, and the compressive strength of mullite pellets reach 124.8 N. This study puts forward a feasible route with industrial significance.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Wenliang Wang,Jiale Huang,Yishuai Fu,Weikun Jiang,Yutong Chen,Yujun Ma,Sizhe Han
Improving the yield of target monophenols plays an important role in increasing the economic competitiveness of lignin valorization. In this study, a 3D porous Fe-MoS 2 /CMF catalyst with nanoflower microstructure was successfully fabricated by a simple one-step hydrothermal method. The catalytic depolymerization of the lignin β-O-4 model showed that Fe-doping increased the efficiency of the catalytic conversion reaction and promoted the cleavage of the β-O-4 ether bond, in agreement with theoretical calculations. Reforming of lignin depolymerization vapor revealed that the Fe-MoS 2 /CMF catalysts significantly improved the selectivity of phenol (30.01 wt%) and styrene (16.34 wt%) with the decrease of oligomers . Moreover, finite element simulation showed that the Fe-MoS 2 /CMF catalysts can also enhancing the local thermal effect by creating hot spots on the surface, thereby facilitate the lignin vapor reforming. Consequently, this work provides a promising method for the efficient production of phenol and styrene from lignin using bimetallic nanoarray microwave responsive catalyst.
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