JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jinzhu Wu,Yue Liu,Yuan Yao,Yanbin Shao,Xiaohong Wu
Superabsorbers can find application in the fields of solar cells, blackbody radiation, thermal control systems, and stray light elimination devices. Herein, graphene-like 2H/1T-molybdenum diselenide (MoSe 2 ) was synthesized via a hydrothermal method and shows superhigh solar absorption (~99%) within a range of 200–2500 nm. In the synthesis, selenium dioxide (SeO 2 ) was used as a Se source instead of Se powder, which plays an important role in manipulating the graphene-like morphology and the multiphasic composition of the MoSe 2 . Consequently, the as-prepared MoSe 2 nanoflowers possess desired band structure and abundant pores and pore channels for strong optical absorption. DFT calculations clarify that the 1T-MoSe 2 primarily contributes to the superior optical absorption over the 2H-MoSe 2 . This work provides a facile strategy for enhancing the optical absorption of two-dimensional transition metal dichalcogenides (2D TMDCs) by engineering morphology and phase.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Yinggang Liu,Shuai Liu,Hanxiao Li,Lijun Yu,Lan Sun,Jiale Xue,Ruojun Xu,Guoxiang Chen
Transition metal dichalcogenides (TMDCs) are considered as the potential electrocatalysts for hydrogen evolution reaction (HER) owing to the two-dimensional (2D) geometry and tunable band gap. However, both the inefficient electron transferring and high Gibbs free energies for hydrogen adsorption (ΔG H *) in MoSe 2 limit its further improvement in catalytic performance. Herein, the few-layered 1T@2H–MoSe 2 composite nanosheets are synthesized by one-pot hydrothermal reaction . It is found that the morphology and composites of nanosheets could be influenced by hydrothermal reaction parameters. As compared to pure 2H–MoSe 2 , 1T@2H–MoSe 2 electrode exhibits remarkable activity for HER with a low overpotential (118 mV), small Tafel slope (65.8 mV·dec −1 ) as well as large electrochemical active area (C dl = 37.5 mF cm −2 ) in acid electrolytes. Density functional theory (DFT) calculations demonstrate that ΔG H * of 1T@2H–MoSe 2 (0.232 eV) is much lower than these of pure 1T-MoSe 2 and 2H–MoSe 2 . It could be ascribed to both the optimized charge transfer and increased density of active sites in 1T@2H–MoSe 2 nanosheets.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Zhifeng He,Yuchen Jiang,Xin Cui,Zeyi Liu,Xin Meng,Jiafeng Wan,Fangwei Ma
Recently, molybdenum (Mo)-based catalysts have been proved to be effective NRR catalysts due to the high affinity of nitrogen to Mo. The design of a heterostructure and the introduction of defects, such as vacancies and heteroatom doping, are effective means to regulate the microstructure of catalysts and further improve their electrocatalytic N2 into NH3 performance. In this paper, VS-Fe-doped 1T/2H mixed-phase MoS2/C (VS means sulfur vacancies) heterostructure sphere-like nanoflowers with rich sulfur vacancies are prepared through a pectin-assisted hydrothermal reaction, followed by calcination and treatment with NaBH4 solution. VS-Fe-MoS2/C exhibits good electrocatalytic NRR performance with a high ammonia yield rate of 17.8 ± 0.7 μg h–1 mg–1 at −0.5 V versus reversible hydrogen electrode (vs RHE) and a Faraday efficiency (FE) of 9.2% at −0.3 V (vs RHE) under ambient conditions. Introducing sulfur vacancies, iron doping, and preparing 2H-phase MoS2 have greatly improved the performance of electrocatalytic nitrogen reduction to ammonia.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2023
·
IF 13.1
Fei Wu,Mengyun Ling,Lei Zhang,Qiuyu Zhang,Baoliang Zhang
Herein, we propose a combination strategy to induce robust room-temperature electromagnetic coupling in non-magnetic MoS 2 semiconductor (2H–MoS 2 ). The introduction of ascorbic acid (AA) is intended to introduce sulfur vacancies ( sv ) in the process of 2H–MoS 2 nano-sheet shells coating on the surface of three-dimensional (3D) matrix. It promotes the transformation of local lattice (2H–MoS 2 ) into metal phase (1T-MoS 2 ). The transformed 1T-MoS 2 phase improves the conductivity ( σ ) of the composite by 1.48 times. Due to the Mo 4+ 4 d energy state within the bandgap, the exchange interaction between the sv and the Mo 4+ 4 d bandgap state produces a robust intrinsic electromagnetic response of more than 1.2 emu/g. Density functional theory (DFT) calculations are used to analyze the above results, and a novel electromagnetic-coupling-enhanced microwave absorption mechanism is proposed. The results indicates that microwave absorption performance can be effectively improved by the phase-incorporation effect. The minimum reflection loss (RL min ) reaches −53.1 dB (1.7 mm) and the adjustable effective absorption bandwidth (EAB) covers 14.5 GHz (3.5–18 GHz) at the various matching thicknesses. This work might shed light on a new possibility of manipulating electromagnetic interaction to promote microwave absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Siyu Pang,Zhihao Si,Guozhen Li,Hanzhu Wu,Yuhui Cui,Changwei Zhang,Cong Ren,Shuai Yang,Shusheng Pang,Peiyong Qin
A high-quality mixed matrix membrane (MMM) with high flux and separation factor is fostered to enhance ethanol pervaporation . In this study, a fluorinated and defect-free ZIF-8/PDMS membrane was prepared by the covalent bonding among fluoromonomer, ZIF-8 particles and PDMS using a one-pot method. ZIF-8 is first modified with 3-amino-1,2,4-triazole (Atz) to graft –NH 2 groups, and then modified with glycidyl methacrylate (GMA). This was achieved by the amine-epoxide addition reaction (named GZIF-8) to facilitate covalent bonding with methacrylate-functionalized PDMS, where the interfacial compatibility ZIF-8 and PDMS is improved. Moreover, 1H,1H,2H,2H-perfluorooctyl methacrylate (13F) as F-monomer is introduced into the membrane formation process by the polymerization of methacrylate groups among 13F, ZIF-8 and PDMS, where a fluorinated structure with high hydrophobicity and low surface energy is formed. The pervaporation performance for a 5 wt% ethanol solution at 60 °C shows that the resulting MMM has a high separation factor of 9.5 and total flux of 1681 g m −2 h −1 under the optimized parameters of 3 wt% GZIF-8 loading and 12 wt% 13F amounts.
研究领域:
材料科学
·
化学工程
·
膜技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Xiao Zhu,Shasha Feng,Shuaifei Zhao,Feng Zhang,Chong Xu,Min Hu,Zhaoxiang Zhong,Weihong Xing
Polytetrafluoroethylene (PTFE) nanofiber membranes have been widely used in various air purification applications attributed to their excellent thermal and chemical stabilities. However, in oily fume purification, oil aerosols can easily permeate through the oleophilic membrane, which may lead to pore blocking, and increased filtration resistance and energy consumption, finally reducing the filtration efficiency and lifespan of the membrane. Herein, we report a hierarchical SiO 2 @PTFE nanofiber membrane by coaxial electrospinning of SiO 2 nanoparticle dispersion as the shell spinning solution and PTFE emulsion as the core spinning solution, followed by in-situ surface grafting of 1H,1H,2H,2H-perfluorooctyltrimethoxysilane. The prepared amphiphobic membrane has both superhydrophobicity and oleophobicity with the water and oil contact angles of 173° and 134°, respectively. It possesses uniform pore structures , high gas permeability (697 m 3 m −2 h −1 kPa −1 ), excellent oily fume filtration efficiency (˃99%), as well as a low pressure drop (2.5 kPa) during 60-min filtration. Furthermore, our perfluorinated amphiphobic SiO 2 @PTFE nanofiber membrane exhibits good reusable and stable properties. This work opens a versatile approach to design efficient functionalized membranes in the field of oily fume purification.
研究领域:
材料科学
·
环境工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Huimin Xu,Zhonghua Zhang,Jiajia Li,Lixin Qiao,Chenglong Lu,Kun Tang,Shanmu Dong,Jun Ma,Yongjun Liu,Xinhong Zhou,Guanglei Cui
Highly reductive magnesium borohydride [Mg(BH4)2] is compatible with metallic Mg, making it a promising Mg-ion electrolyte for rechargeable Mg batteries. However, pure Mg(BH4)2 in ether-based solutions displays very limited solubility (0.01 M), low oxidative stability (<1.8 V vs Mg), and nucleophilic characteristic, all of which preclude its practical utilization for any battery applications. Herein, we present a multifunctional additive of tris(2H-hexafluoroisopropyl)borate (THFPB) for preparing Mg(BH4)2-based electrolytes. By virtue of the strong electron-acceptor ability of the THFPB molecule, a transparent and high-concentration Mg(BH4)2/THFPB-diglyme (DGM) electrolyte (0.5 M, almost 50 times higher than that of the pristine Mg(BH4)2-DGM electrolyte) is first obtained, which shows dramatic performance improvements, including high ionic conductivity (3.72 mS cm–1 at 25 °C) and high Mg plating/stripping Coulombic efficiency (>99%). The newly-generated active cation and anion species revealed by Raman, NMR and MS spectra, increase the electrochemical potential window from 1.8 V to 2.8 V vs Mg on stainless steel electrode, rendering electrolytes the ability to examine high voltage cathodes. More importantly, on account of the non-nucleophilicity of active electrolyte species, we present the first example of magnesium–sulfur (Mg–S) batteries using Mg(BH4)2-based electrolytes, which exhibit a high discharge capacity of 955.9 and 526.5 mA h g–1 at the initial and 30th charge/discharge cycles, respectively. These achievements not only provide an efficient and specific strategy to eliminate the major roadblocks facing Mg(BH4)2-based electrolytes but also highlight the profound effect of functional additives on the electrochemical performances of unsatisfied Mg-ion electrolytes.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Kunjie Wang,Yanan Li,Dongxu Yang,Yunsi Wang,Fuan Wei,Bingxin Liu,Peng Zhang,Benhua Xu,Yongcheng Li
Coupling noble metals on molybdenum disulfide (MoS 2 ) has emerged as a promising strategy for triggering inert basal plane and boosting hydrogen evolution reaction (HER) performances. Herein, ultrafine Ru nanoparticles (NPs) are decorated on vertical 2H MoS 2 nanosheets via a facile hydrothermal method. Benefiting from new active site centers triggered by ultrafine Ru NPs and vertically grown 2H MoS 2 nanosheets on carbon cloth (CC), Ru 0.15 @2H MoS 2 exhibits impressive HER performances in dual pH media, with low overpotentials of 20 and 111 mV and small Tafel slope of 67.6 and 76.3 mV dec ‑1 in alkaline and acid solutions to drive a current density of 10 mA cm -2 . DFT calculation results prove that ultrafine Ru NPs decorated on 2H MoS 2 nanosheets endow Ru 0.15 @2H MoS 2 with low hydrogen adsorption free energy and fast charge transfer kinetics. This work provides an effective and simple method for designing MoS 2 -based catalysts with high catalytic activity to decorate precious metal in a wide pH medium.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Zhuangzhi Wu,Rongbin Zhang,Hao Fei,Ruoqi Liu,Dezhi Wang,Xinli Liu
The NH 3 is generally synthesized by the traditional Haber–Bosch method, which is energy-consuming and releases a lot of CO 2 . Electrocatalytic fixation of N 2 is highlighted as a carbon-free route to generate NH 3 by the nitrogen reduction reaction (NRR), but strongly demands highly efficient and durable electrocatalysts. Herein, we propose the multiphasic 1T@2H-MoSe 2 as a highly active NRR catalyst for the first time, which exhibits excellent activity for the NRR with a NH 3 yield of 19.91 ± 0.89 μg h −1 mg cat . −1 and a FE of 2.82% ± 0.1% at −0.6 V in 0.1 M Na 2 SO 4 . Moreover, a good durability is also demonstrated.
研究领域:
材料科学
·
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL RESEARCH
·
2015
·
IF 0.633
Fang-Ming Wang,Dan Bao,Bing-Xiang Hu,Ze-Yu Zhou,Deng-Deng Huang,Li-Zhuang Chen,Yuan-Yuan Dan
A series of novel 10-substituted 3,6-diphenyl-9-aryl-3,4,6,7,9,10-hexahydroacridine-1,8(2H,5H)-dione derivatives synthesised by condensation of different amines with xanthenes, was prepared from 5-phenylcyclohexane-1,3-dione and aromatic aldehydes by a Knoevenagel and Michael reaction and cyclisation catalysed by a trace of l-proline at room temperature. In addition, the molecular structure of a xanthene was determined by single-crystal X-ray diffraction analysis.
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Shiting Li,Yuehan Wang,Chang Cai,Hong Huang,Honggen Peng,Xiaoxiao Fu,Zhimin Ao,Chunyang Nie
MoS 2 polytypes are emerging as compelling metal-sulfide catalysts for peroxymonosulfate (PMS) activation in water decontamination. The catalytic properties of the 1 T and 2H phases have been extensively explored, the performance of the 3 R polytype remains largely unknown. This work presents a comparative investigation of bulk 2H-MoS 2 and 3R-MoS 2 for activating PMS to remove phenol, with a specific focus on the understudied 3 R phase. A ball-milling pretreatment was employed to create sulfur vacancies, a critical active site, in both polytypes. Through a combined experimental and theoretical approach, we demonstrate that sulfur-defective 2H-MoS 2 exhibits superior catalytic activity for PMS activation, with a phenol degradation reaction rate constant 4.3 times higher than that of its 3 R counterpart. More importantly, we unveil that both polytypes activate PMS predominantly via a nonradical pathway mediated by surface Mo-PMS⁎ complexes, rather than generating free radicals. However, in-situ Raman spectroscopy and DFT calculations reveal that the distinct electronic structures of the two polytypes lead to the formation of Mo-PMS complexes with different configurations and oxidative capabilities, explaining their disparate selectivity towards various organic pollutants. This study provides the first mechanistic insight into PMS activation by 3R-MoS 2 and establishes that the crystal polytype is a critical, previously overlooked factor governing the efficiency and oxidation pathway in MoS 2 -based advanced oxidation processes, offering a vital guideline for selecting suitable MoS 2 catalysts in environmental applications.
研究领域:
环境催化
·
高级氧化工艺
·
材料科学
·
水处理
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 48
·20471-20480
·
IF 7.79
Qiang Yu,Shun Wang,Yan Zhang,Zhuo Dong,Haiqin Deng,Kun Guo,Tao Wang,Xinyao Shi,Fangqi Liu,Tianhao Xian,Sicong Zhu,Jian Wu,Ziyang Zhang,Kai Zhang,Li Zhan
Tantalum disulfide (TaS2), an emerging group VB transition metal dichalcogenide, with unique layered structure, rich phase diagrams, metallic behavior, higher carrier concentration and mobility is emerging as a prototype for revealing basic physical phenomena and developing practical applications. However, its photonics properties and even engineering-related processes are still rare. Here, the top-down experiment demonstration, including synthesis, thickness optimization and nonlinear optical application, has been reported. In addition, the ultrafast (∼373 fs) erbium-doped fiber pulse with a small time-bandwidth product (∼0.34) and long-term stability (∼25 days) was realized using the nonlinear absorption properties of the high-quality 2H-TaS2 nanosheet. These results suggest an experimental route for further ultrafast photonics exploration based on metallic transition metal dichalcogenides.
研究领域:
光子学
·
纳米材料
·
非线性光学
·
激光物理
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）