INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2023
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IF 4.2
Huangcong Tang,Jiayang Dou,Zhixian He,Jingwen An,Wenhuan Liu,Sheying Dong
Heterostructured catalysts with the potential synergies between the polymetallic sulfides and the construction of 1T-phase MoS2 are a promising alternative and contribute to obtain the enhanced hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance. Herein, the porous hybrid nanostructures coupling FeS2 and NiS complexes with 1T/2H phase MoS2 (FeNiSx@MoS2–HZHx) are prepared via a facile one-pot pyrolysis strategy accompanied by hydrazine hydrate (HZH)-induced phase transformation without the assistance of a template. The hybrid nanostructures possessing crystalline–amorphous (c–a) interface need overpotentials of 139 mV to achieve the current density of 10 mA cm–2 (η10) in 0.5 M H2SO4, which have superior kinetics for the HER process with a Tafel slope value of 57.9 mV dec–1. The 24 h continuous HER operated at η10 exhibits negligible deterioration, which has only a decrease of 3 mV at η10 after the 5000 cyclic voltammetry cycle tests, indicating the desirable stability of FeNiSx@MoS2–HZH2. Beyond that, the resultant FeNiSx@MoS2 requires 335 mV at η10. Specifically, the electrochemical and structural characterization prove that the enhanced HER performance is contributed from the incorporation of HZH to form FeS2/MoS2/NiS heterostructures and c–a interface sites coupling with 1T/2H phase MoS2, which provide more exposed active sites benefiting from the larger surface area. The simple and convenient design strategy has certain enlightenment for the development of sustainable energy production.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yu-Gang Fu,Han-Qiao Liu,Cong Liu,Qiu-Feng Lü
Molybdenum disulfide (MoS 2 ) has a Gibbs free energy comparable to platinum (Pt), suggesting it can replace Pt as a hydrogen evolution reaction (HER) catalyst. However, the shortcomings of the restricted number of MoS 2 active sites and poor intrinsic electrical conductivity have resulted in impeding its widespread application. In this work, Co/MoS 2 @NPC electrocatalyst was prepared by using nitrogen-doped porous carbon (NPC) as a substrate material, and then hydrothermally anchoring cobalt-doped molybdenum disulfide (Co-doped MoS 2 ) on the substrate. Co/MoS 2 @NPC was subsequently applied to hydrogen evolution reaction in acidic and alkaline media. It was found that the overpotential of 0.2Co/MoS 2 @NPC was only 139 mV for HER at 10 mA cm −2 with a Tafel slope of 69 mV dec −1 in acidic medium; while in alkaline medium, its overpotential was 163 mV with a Tafel slope of 106 mV dec −1 , and it operated stably over 10 h. The superior HER performance may be related to the point that NPC as a substrate can uniformly disperse MoS 2 , exposing more active sites and ensuring high electronic conductivity of MoS 2 . In addition, the introduction of Co into MoS 2 changed the intrinsic activity of MoS 2 and interacted with CoS x and pyridine nitrogen in NPC, constituting a ternary catalytic interaction. Therefore, this study provides a novel strategy for optimizing the HER activity of MoS 2 .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Qingqing Li,Yingzhang Shi,Zhiwen Wang,Cheng Liu,Jinhong Bi,Jimmy C. Yu,Ling Wu
A series of dehydrated MoS 2 /UiO-66(SH) 2 (MS/UiS) composites has been prepared as photocatalysts for N 2 fixation. Typically, 10% MS/UiS exhibits the best performance with an NH 4 + yield rate of 54.08 μmol∙g −1 ∙h −1 . 15 N isotope test confirmed that the sample 10% MS/UiS was most effective for reducing N 2 to ammonia. Such enhanced activity was due to the presence of abundant unsaturated Zr and Mo sites which would synergistically promote the adsorption and activation of N 2 . The photogenerated electrons would transfer to the unsaturated Zr-O clusters while part of photogenerated electrons at the interface migrate to MS via Mo VI -O interactions between MS and UiS. These two electron transfer pathways effectively promote the separation of photogenerated carriers. The activated N 2 is reduced to ammonia by the synergistic effect of protonated hydrogen and photogenerated electrons. Finally, a possible N 2 fixation mechanism is proposed which emphasizes the significant roles of nitrogen activation and interface interaction in composites photocatalyst for improving photocatalytic performance.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jie Zhou,Nan Zhou,Mingjie Liu,Haokun Tan,Zhichao Wang,Xiaoyuan Zhang,Zhiqiang Su
Sensors in intelligent monitoring and personal healthcare generally face power supply problems, such as cycle charging, regular maintenance, and battery replacement, which greatly limit the applications of sensing devices. Self-powered sensing system with a visible-light-driven photo-fuel cell (PFC) exhibits the advantage of not requiring any external power source for the chemical sensing of analytes. In this work, an enzyme-free PFC self-powered sensing platform was established for sensing sweat lactate using photoelectric conversion technology. A NiTiO 3 /Bi 2 O 3 /MoS 2 double Z-type heterojunction system was prepared by electrostatic interaction and self-assembly as the anode of the PFC. NiTiO 3 , Bi 2 O 3 and MoS 2 formed a double Z-type heterojunction system accelerated the electron transfer and improved the light absorption and photocatalytic efficiency, which in turn improved the perception of LA. In addition. lactic acid sensing experiments showed that the prepared non-enzymatic photoelectrochemical sensors had good detection performance. The assay results showed that the prepared biosensor has a wide detection range (30 μM-5 mM), low detection limit (6 μM), high selectivity(8μA μM −1 cm −2 ) and long-term stability. These assay results demonstrate its potential for applications in fields such as biomedicine and drug analysis.
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TALANTA
·
2023
·
IF 6.1
A. Ravikumar,S. Kavitha,Amutha Arul,P. Rajaji,Tamilselvan G,Xuesong Li,Beibei Wu,Velappa Jayaraman Surya,Jun Tang,Yuvaraj Sivalingam,Zhen Zhang
The rational development of efficient nanozymes for the colorimetric detection of targets is still challenging. Herein, Prussian blue analogues of Ni–Co–MoS 2 nano boxes were fabricated for colorimetric detection of glyphosate and copper ions owing to its peroxidase like activity. At the sensing system, the Ni–Co–MoS 2 nano boxes display high peroxidase activity, which could catalytically oxidize the colourless TMB to blue colour oxTMB. In presence of glyphosate in this sensing system the blue colour is diminished, ascribed to the inhibit the catalytic activity of Ni–Co–MoS 2 nano boxes. Concurrently, the addition of copper ion, which result in blue colour was reappear due to the generation of glyphosate-copper complex formation. The Ni–Co–MoS 2 nano boxes based colorimetric sensing platform was developed to sensitive detection of glyphosate and copper ions with low detection limit of 3 nM for glyphosate and 3.8 nM for copper. This method also displays satisfactory outcomes from real samples analysis and its good accuracy. Therefore, this work provides a great potential for rapid detection of the targets from the environments.
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Materials Today Physics
·
2023
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IF 11.5
Ziqing Yang,Xiaosi Qi,Chen Li,Qiqing Liang,Lei Wang,Junfei Ding,Yunpeng Qu,Xiu Gong,Wei Zhong
Interfacial polarization had a great impact on the attenuation of electromagnetic wave . To aggrandize interfacial polarization, a strategy of constructing the abundant interfaces was proposed and investigated. Herein, CoNi nanospheres , CoNi@SiO 2 nanospheres and core@shell CoNi 2 S 4 /Co 9 S 8 @SiO 2 @MoS 2 flower-like multicomponent nanocomposites (MCNCs) were elaborately designed and successfully fabricated through a simple continuous hydrothermal process, classical Stöber method and hydrothermal treatment . The obtained results demonstrated that the elaborately constructed abundant interfaces greatly boosted the polarization loss ability, which resulted in the enhanced interfacial polarization. Therefore, the as-prepared CoNi 2 S 4 /Co 9 S 8 @SiO 2 @MoS 2 flower-like MCNCs presented the superior electromagnetic wave absorption properties (EMWAPs) compared to the CoNi and CoNi@SiO 2 precursors. Furthermore, the EMWAPs of CoNi 2 S 4 /Co 9 S 8 @SiO 2 @MoS 2 flower-like MCNCs could also be further improved by optimizing the hydrothermal temperature and filler loading. The obtained CoNi 2 S 4 /Co 9 S 8 @SiO 2 @MoS 2 flower-like MCNCs presented the excellent comprehensive EMWAPs including strong absorption capability, broad absorption bandwidth and thin matching thickness, which could be attributed to the unique structure, excellent interfacial polarization and synergistic effect. Therefore, this finding not only demonstrated that introducing the abundant interfaces was an effective strategy to strengthen interfacial polarization for the promotion of EMWAPs, but also provided an alternative approach to exploit the novel high-efficiency microwave absorbers.
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ACS Applied Materials & Interfaces
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2023
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IF 9.5
Jing Wu,Tingting Zhang,Jin Qu,Fan-Zhen Jiao,Chen Hu,Hao-Yu Zhao,Xiaofeng Li,Zhong-Zhen Yu
Although the emerging interfacial solar steam generation technology is sustainable and eco-friendly for generating clean water by desalinating seawater and purifying wastewaters, salt deposition on the evaporation surface during solar-driven evaporation severely degrades the purification performances and adversely affect the long-term performance stability of solar steam generation devices. Herein, to construct solar steam generators for efficient solar steam generation and seawater desalination, three-dimensional (3D) natural loofah sponges with both macropores of the sponge and microchannels of the loofah fibers are hydrothermally decorated with molybdenum disulfide (MoS2) sheets and carbon particles. Benefiting from fast upward transport of water, rapid steam extraction, and effective salt-resistant capacity, the 3D hydrothermally decorated loofah sponge with MoS2 sheets and carbon particles (HLMC) with an exposed height of 4 cm can not only obtain heat by its top surface under the downward solar light irradiation based on the solar–thermal energy conversion but also gain environmental energy by its porous sidewall surface, achieving a competitive water evaporation rate of 3.45 kg m–2 h–1 under 1 sun irradiation. Additionally, the 3D HLMC evaporator exhibits long-term desalination stability during the solar-driven desalination of an aqueous salt solution with 3.5 wt % NaCl for 120 h without apparent salt deposition because of its dual type of pores and uneven structure distribution.
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Chemistry-An Asian Journal
·
2023
·Vol. 18
·期 10
·e202300166
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IF 4.1
Yu Zhang,Douxin Xiao,Alideertu Dong
Graphical A dopamine-modified oxidized hyaluronic acid was used as the backbone of a hydrogel, which was physically mixed with Fe 3+ , poly(lysine) and glucose oxidase loaded onto PEI-coated MoS 2 nanosheets to construct a multimodal synergistic antibacterial hydrogel. It is combined with the cationic antimicrobial properties of the hydrogel and the photothermal effect of MoS 2 to achieve multimodal synergistic bactericidal action. Given the poor antibacterial activity of hydrogels, a multimodal synergistic antibacterial hydrogel based on dopamine-modified oxidized hyaluronic acid was developed, and its antibacterial activity and biocompatibility were demonstrated. First, dopamine-modified oxidized hyaluronic acid (OHA-DA) was used as the hydrogel backbone. A dual-dynamically cross-linked injectable hydrogel was constructed by mixing OHA-DA, Fe 3+ with cationic antimicrobial peptide polylysine (EPL) via Schiff base and coordination complexation. Next, glucose oxidase-loaded MoS 2 nanosheets were synthesized through electrostatic interaction and loaded into the hydrogel through physical mixing. Finally, a multimodal synergistic antibacterial hydrogel OD/EPL/GM was obtained. Antibacterial experiments show that the hydrogel has good antibacterial activity against E. coli and S. aureus , and the antibacterial rate can reach 99.99%.
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ADVANCED POWDER TECHNOLOGY
·
2023
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IF 5.2
Tingting Mao,Qihui Ding,Qian Shan,Xiaochen Chang,Wei Wu
In this paper, a magnetic ferrosoferric oxide/two-dimensional molybdenum disulfide (Fe 3 O 4 /2D-MoS 2 ) composite material was successfully prepared by combining liquid phase exfoliation and in-situ liquid phase co-precipitation methods with scalable and facile characteristics and applied to catalyze the degradation of tetracycline (TC) during the peroxymonosulfate-based advanced oxidation processes (PMS-AOPs), which is a typical and widely used antibiotic. The morphology and crystallinity of the composites were determined by scanning electron microscopy, transmission electron microscope and X-ray diffraction, respectively. And its BET surface area was tested by N 2 adsorption and desorption curves. For the PMS-AOPs, the effects of iron loading, different systems, initial concentration of pollutants, dosage of the composites, concentration of peroxymonosulfate (PMS) and solution initial pH on the removal of TC were researched in details. The results showed that it could reach 89.0% degradation efficiency within 90 min for 50 mg/L TC with the as-prepared composites as catalyst, showing good catalytic performances. In addition, the mechanisms of the reaction were deduced by quenching experiments and X-ray photoelectron spectroscopy analysis. It was turned out that the as-synthsized material has a broad applying prospect in PMS-AOPs.
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CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Baoyun Ye,Hongyi Chen,Binhao Shen,Chang Liu,Chongwei An,Jingyu Wang,Yong Zhang
In this work, a novel CuO-based nanocomposite was successfully prepared by hydrothermal method . The results of FT-IR, XRD , XPS and SEM indicated that the nano CuO was successfully loaded on GO/MoS 2 sheets. The catalytic ability of the CuO-based composite was researched by the AP thermal decomposition behavior and the combustion behavior of AP/HTPB. The CuO-based composite could significantly enhance the AP thermal decomposition performance through decreasing the activation energy of AP during the thermal decomposition process. Especially for CuO(90)@MG(10), the AP thermal decomposition temperature was reduced from 437.5 to 334.9 °C and the heat release increased from 396.7 to 1576.8 J/g by adding 4% of the CuO-based nanocomposite. After adding the CuO-based nanocomposite, the ignition delay time of AP/HTPB solid propellant decreased obviously from 0.346 s to 0.109 s with a higher flame height and a stronger flame brightness during the combustion process, indicating that the CuO-based nanocomposite could effectively promote the combustion behavior of AP/HTPB composite solid propellant. In summary, the CuO-based nanocomposite could be applied as an excellent catalyst for improving AP thermal decomposition and a combustion catalyst for AP-based composite solid propellants.
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Journal of Materials Chemistry B
·
2019
·Vol. 7
·期 15
·2549-2556
·
IF 5.047
Yaping Zhong,Tao Yi
We report a one-step hydrothermal method for the preparation of fluorescent molybdenum disulfide quantum dots (MoS2 QDs) and demonstrate the feasibility of fluorescent “turn-off–on” sensing of adenosine triphosphate (ATP) by using the MoS2 QDs. MoS2 QDs having strong blue-green fluorescence at 506 nm and good water-solubility were successfully synthesized by using ammonium tetrathiomolybdate as a single precursor. The fluorescence of MoS2 QDs was first quenched by Fe3+ through the formation of a MoS2 QDs/Fe3+ complex. ATP with the ability to coordinate with Fe3+ caused the dissociation of MoS2 QDs/Fe3+, resulting in the final release of MoS2 QDs and the recovery of fluorescence through a one-step competitive chelating process that took only 10 min to reach equilibrium at room temperature (RT). Facile and rapid sensing of Fe3+ and ATP could thus be achieved through the fluorescent “turn-off–on” strategy. Good linear relationships were obtained over the concentration ranges of 0–200 μM for Fe3+ and 0–140 μM for ATP with a lowest detectable concentration of 5 μM for ATP. Satisfactory results were obtained when the method was applied to a standard addition recovery trial of ATP in human serum samples. No complex surface modification during the preparation or detection process was needed based on the fluorescent “turn-off–on” method of the MoS2 QDs, which suggests its great potential in fluorescent sensing.
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Nanomaterials
·
2019
·Vol. 9
·期 8
·1139
·
IF 4.034
Bo Zhang,Zhenhai Wang,Xiangfeng Peng,Zhao Wang,Ling Zhou,QiuXiang Yin
An atmospheric plasma treatment strategy was developed to prepare two-dimensional (2D) molybdenum disulfide (MoS2) and graphitic carbon nitride (g-C3N4) nanosheets from (NH4)2MoS4and bulk g-C3N4, respectively. The moderate temperature of plasma is beneficial for exfoliating bulk materials to thinner nanosheets. The thicknesses of as-prepared MoS2and g-C3N4nanosheets are 2–3 nm and 1.2 nm, respectively. They exhibited excellent photocatalytic activity on account of the nanosheet structure, larger surface area, more flexible photophysical properties, and longer charge carrier average lifetime. Under visible light irradiation, the hydrogen production rates of MoS2and g-C3N4by plasma were 3.3 and 1.5 times higher than the corresponding bulk materials, respectively. And g-C3N4by plasma exhibited 2.5 and 1.3 times degradation rates on bulk that for methyl orange and rhodamine B, respectively. The mechanism of plasma preparation was proposed on account of microstructure characterization and online mass spectroscopy, which indicated that gas etching, gas expansion, and the repulsive force of electron play the key roles in the plasma exfoliation. Plasma as an environmentally benign approach provides a general platform for fabricating ultrathin nanosheet materials with prospective applications as photocatalysts for pollutant degradation and water splitting.Keywords:dielectric barrier discharge plasma;MoS2nanosheets;g-C3N4nanosheets;photodegradation;water splitting;gas etching;repulsive force
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