JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Huaizhi Liu,Liao Xu,Weixu Liu,Bo Zhou,Yinyan Zhu,Lihua Zhu,Xiaoqing Jiang
Here, we report a facile salt-assisted direct liquid-phase exfoliation method for mass production of MoS 2 nanosheets . We choose organic solvent isopropanol (IPA) as exfoliation media and potassium ferrocyanide, potassium sodium tartrate, or sodium tartrate as salt, the assistant. The selected salts show universal and efficient assistant effect for the exfoliation of MoS 2 in IPA. Especially, potassium ferrocyanide (K 4 Fe(CN) 6 ) can enhance the exfoliation efficiency up to 73 times and a dispersion of MoS 2 nanosheets with concentration as high as 0.240 mg mL −1 can be easily obtained in IPA-K 4 Fe(CN) 6 system. Transmission electron microscopy, atomic force microscopy (AFM), and Raman spectroscopy show that bulk MoS 2 has been successfully exfoliated into mono- to few-layer MoS 2 nanosheets . AFM analysis indicates that nearly 60% flakes are monolayer in MoS 2 dispersion.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Qian Wu,Guo Feng,Lifeng Miao,Zijuan Tang,Weihui Jiang,Jian Liang,Jianmin Liu
Mesoporous petal-like MgAl 2 O 4 spinel has been prepared by molten salt assisted nonhydrolytic sol–gel method. The influence of Mg/Al molar ratio (0.45, 0.50, 0.55, 0.60, 0.70 and 0.80) on the morphology and surface area of MgAl 2 O 4 was investigated. The results reveal that Mg/Al molar ratio has a significant influence on the morphology. At Mg/Al molar ratio of 0.7, the achieved petal-like MgAl 2 O 4 is highly uniformed in morphology, the surface area and pore volume reached maximum values of 141 m 2 g −1 and 0.24 cm 3 g −1 , respectively. These properties make it have promising applications in the catalyst support field.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 6
·2629
·
IF 4.6
Xinru Ma,Xuxia Shai,Yu Ding,Jie Zheng,Jinsong Wang,Jiale Sun,Xiaorui Li,Weitao Chen,Tingting Wei,Weina Ren,Lei Gao,Shukang Deng,Chunhua Zeng
Thermoelectric (TE) technology, which can convert scrap heat into electricity, has attracted considerable attention. However, broader applications of TE are hindered by lacking high-performance thermoelectric materials, which can be effectively progressed by regulating the carrier concentration. In this work, a series of PbSe(NaCl)x(x = 3, 3.5, 4, 4.5) samples were synthesized through the NaCl salt-assisted approach with Na+and Cl−doped into their lattice. Both theoretical and experimental results demonstrate that manipulating the carrier concentration by adjusting the content of NaCl is conducive to upgrading the electrical transport properties of the materials. The carrier concentration elevated from 2.71 × 1019cm−3to 4.16 × 1019cm−3, and the materials demonstrated a maximum power factor of 2.9 × 10−3W m−1K−2. Combined with an ultralow lattice thermal conductivity of 0.7 W m−1K−1, a high thermoelectric figure of merit (ZT) with 1.26 at 690 K was attained in PbSe(NaCl)4.5. This study provides a guideline for chemical doping to improve the thermoelectric properties of PbSe further and promote its applications.Keywords:chemical doping;salt-assisted;NaCl doping;PbSe;thermoelectric material;thermoelectric performance
研究领域:
材料科学
·
物理学
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产品关联
DOI
PubMed
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2020
·
IF 2.615
Ze-peng LÜ,Kai-liang JIAN,Jie DANG
A simple method was proposed to produce tungsten (W) particles with controllable shape and size by employing the salt-assisted hydrogen reduction. W particles with controlled shape and size were prepared by adjusting the amount of chlorine salts and the temperature. After adding salt additives, the dispersibility of final particles was obviously improved and more adequate growth of particles was obtained. It was found that the effect of NaCl and LiCl is particularly significant. The average sizes of the obtained W particles at 1038 K after adding 0.1 wt.% NaCl and 0.1 wt.% LiCl were 0.924 and 1.128 μm, respectively. With the increase of temperature and amount of chlorine salts, the dispersity of the produced W particles became much better, the size of W sub-particles was increased, and the shape of W sub-particles was changed from spherical to polyhedral. At 1349 K, the addition of chlorine salts even multiplied the particle size, and the average sizes of W particles with 1 wt.% NaCl and 1 wt.% LiCl were raised up to 21.367 and 29.665 μm, respectively. Based on the conventional pseudomorphic transformation and chemical vapor transport mechanisms, the effects of adding salts on the reaction mechanism were investigated in detail as well.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yue An,Yiwei He,Mingtao Li,Wenying Yu,Na Tian,Yihe Zhang,Hongwei Huang
Graphitic phase carbon nitride (g-C 3 N 4 ) is considered one of the most promising catalysts for photocatalytic production of hydrogen peroxide (H 2 O 2 ) due to its green and non-polluting nature and stability. However, the conventional g-C 3 N 4 prepared by direct thermal polymerization has insufficient reaction sites due to its excessive bulk defects derived from incomplete polymerization and low specific surface area, leading to rapid carrier recombination and limited photocatalytic activity. In this work, a series of crystalline g-C 3 N 4 (CN-UxM) with large specific surface areas have been prepared by a molten salt post-treatment strategy with regulating the precursor ratio of urea to melamine . In-situ KPFM, photoelectrochemical experiment and DFT calculation results show that the sample with an optimized urea/melamine ratio of 20 (CN-U20M) has the highest charge separation and transfer efficiency derived from the internal electric field. And its H 2 O 2 production rate under simulated visible light reaches as high as 10.94 mmol∙g −1 ∙h −1 , far exceeding that of most g-C 3 N 4 -based photocatalysts in reported literatures. The present work provides an effective strategy to enhance the photocatalytic activity of g-C 3 N 4 , which is expected to be applied to other organic semiconductor catalytic systems.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2025
·
IF 4.3
Xiangwei Huang,Kai Liu,Bojun Shao,Lunchun Guo,Wugang Liao,Congwei Liao,Peng Yang
The growth of monolayer MoS2 via chemical vapor deposition typically necessitates high temperatures over 700 °C, which presents challenges for application in the integrated circuit industry where back-end-of-line processes require temperatures possibly below 500 °C. In this study, we demonstrate a method that combines potassium chloride mixed with a MoO3 precursor and perylene-3,4,9,10-tetracarboxylic acid tetra potassium salt as a seeding promoter for substrate pretreatment, which can effectively lower the growth temperature of MoS2 on sapphire and SiO2/Si substrates to 460 °C. The reduced growth temperature is achieved without compromising the material’s quality, making this method potentially transformative for the semiconductor industry. Our first-principles calculations and theoretical modeling accurately describe the observed morphological evolution of monolayer MoS2 crystals during growth. The crystal growth is governed by the probability of atom attachment to different edge types, which is determined by the varying formation energies of the nuclei at these edges. The grown monolayer MoS2 was characterized through atomic force microscopy, Raman and photoluminescence spectroscopy, and electrical transport measurements, confirming its high quality and suitability for electronic applications.
研究领域:
材料科学
·
半导体技术
·
理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·Vol. 19
·期 33
·2302465
·
IF 13.3
Pengye Du,Pengpeng Lei,Yuan Liang,Ran An,Hongjie Zhang
Lanthanide-doped upconversion luminescent materials (LUCMs) have attracted much attention in diverse practical applications because of their superior features. However, the relatively weak luminescence intensity and low efficiency of LUCMs are the bottleneck problems that seriously limit their development. Unfortunately, most of the current major strategies of luminescence enhancement have some inherent shortcomings in their implementation. Here, a new and simple strategy of molten salt-assisted synthesis is proposed to enhance lanthanide upconversion luminescence for the first time. As a proof-of-concept, a series of rare earth oxides with obvious luminescence enhancement are prepared by a one-step method, utilizing molten NaCl as the high-temperature reaction media and rare earth chlorides as the precursors. The enhancement factors at different reaction temperatures are systematically investigated by taking Yb 3+ /Er 3+ co-doped Y 2 O 3 as an example, which can be enhanced up to more than six times. In addition, the molten salts are extended to all alkali chlorides, indicating that it is a universal strategy. Finally, the potential application of obtained UCL materials is demonstrated in near-infrared excited upconversion white light-emitting diodes (WLEDs) and other monochromatic LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Zijun Niu,Weifeng Liu,Kexiang Wang,Weiwei Sun,Xiaonan Huo,Yanqin Miao,Tingting You,Penggang Yin
Inorganic CsPbI2Br carbon-based perovskite solar cells (C-PSCs) are considered as an alternative promising contender in the field of photovoltaics, attributed to their remarkable thermal stability and cost-effectiveness. However, the defects located at the electron transporting layer (ETL)/perovskite interface (i.e., buried interface) and unsatisfactory crystallinity of CsPbI2Br films hinder the progress in enhancing the power conversion efficiency (PCE). Herein, we put forward facile acetate-assisted buried interface engineering to passivate TiO2/perovskite interface defects along with regulate the crystallization process of CsPbI2Br. Multifunctional small molecule interface modifier zinc acetate (Zn(Ac)2) is introduced into the surface of TiO2 ETL, which can passivate the oxygen vacancy defects of TiO2 and optimize the energy level alignment at the TiO2/CsPbI2Br interface. Meanwhile, part of Ac– may be dissolved in the CsPbI2Br precursor to retard its nucleation process, leading to enhanced crystallinity with a larger grain size of the CsPbI2Br film. As a result, reduced interface defects and bulk defects as well as enhanced electron extraction are achieved, which substantially enhance the PCE of CsPbI2Br C-PSCs from 12.54% to 14.20%, among the highest values of this type of device. Besides, thermal and long-term storage stabilities of the optimized devices are improved.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2013
·
IF 4.814
Yan Yan,Yafan Wu,Yuting Yan,Weisheng Guan,Weidong Shi
Recently, the controlled synthesis of semiconductor photocatalysts has attracted intense attention. In this report, we first report the controlled synthesis of Bi2WO6 nanostructures via the soluble inorganic salt Na2SO4-assisted hydrothermal method by simply adjusting the reaction time and pH value. Four typical Bi2WO6 nanostructures were obtained, namely nestlike nanostructures assembled by nanoplates (NNS-ANPs), rodlike nanostructures assembled by nanoplates (RNS-ANPs), quantum dots-modified nanoplates (QDs-NPs), and smooth-surfaced nanoplates (SSNPs). Tentative formation mechanisms of the different morphologies based on our observations are discussed. Photocatalytic degradation results show that the degradation ratios (DRs) of three-dimensional structures are higher than those of two-dimensional structures, and surface QDs play key roles in enhancing the DR of QDs-NPs. Morphology-dependent photocatalytic activities of different Bi2WO6 nanostructures are possibly due to different charge-separation abilities, which has been demonstrated by photoluminescence analyses.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Bao-Cheng Huang,Gui-Xiang Huang,Jun Jiang,Wu-Jun Liu,Han-Qing Yu
Carbon-based materials are recognized as promising candidates for pollutant degradation because of their environmental benignity. Massive and cost-effective production and efficient recovery of carbon-based catalysts are crucial to apply this technology. However, various nanostructured carbons with different dimensions are usually utilized as precursors while not considering their complex preparation procedures and the high costs of ingredients. Moreover, catalyst separation and recovery are not given sufficient attention. In this work, a calcium salt-assisted pyrolysis strategy is proposed to tune the catalytic site formation of carbon-based catalysts. Results show that blending equal amounts of Ca2+ (calcium chloride) and organic precursors could greatly improve the catalytic activity of the carbonated product to activate peroxymonosulfate for pollutant degradation. In addition, the proposed synthetic strategy is universal to most of the readily accessed and cost-effective organic precursors. Singlet oxygen is identified as the main reactive oxidant for pollutant removal in the catalytic reaction. By cross-linking calcium ions and alginate as a hydrogel to immobilize the catalyst, the carbon material could be readily recovered. Furthermore, a long-term continuous-flow reactor test is conducted to validate the effectiveness of applying the immobilized catalyst to treat a synthetic wastewater with 0.5 mM bisphenol A. As a result, a green synthesis and immobilization strategy for persulfate catalysts is successfully established, and the prepared catalyst might be applied for wastewater treatment through using calcium salt in two purposes.
研究领域:
环境科学
·
催化材料
·
废水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xiao-Chun Yan,Hong Dong,Hao Tong,Ya Wang,Lu-Hua Shao,Yu-Jiang Du,Jun-Tao Ge,Wen-Bin Fang,Feng-Ming Zhang
The synthesis of single-atom catalysts (SACs) with target architecture owning ultrathin layered morphology, high surface area and exposed metal active sites is still a great challenge. Herein, we chose 2D bimetallic ZIF-L as precursor combined with molten salt assisted method realizing the aimed synthesis of single-atom Ni imbedded in porous and ultrathin N-doped carbon nanosheets for efficient electrocatalytic CO 2 reduction. Molten salt assisted method avoids the collapse, agglomeration, and shrinkage of precursor nanosheets in synthetic process, and benefits the formation of porous structure of nitrogen-doped carbon nanosheets with exposed single-atom Ni active sites. The as-synthesized MS-L-Ni-NC exhibits remarkable electrocatalytic CO 2 -to-CO performance with the faradaic efficiency over 95.9% in a wide potential range from −0.7 to −1.0 V vs. RHE in H-type cell. An optimal FE CO of 98.7% at −0.8 V vs. RHE and a large current density of 20.6 mA·cm −2 at −1.0 V are observed for the MS-L-Ni-NC, which are much higher than those of D-L-Ni-NC without molten-salt assistance and MS-Ni-NC with 3D bimetallic ZIF as precursor. DFT calculations reveal that the coordinated unsaturated pyridine Ni-N sites are the active centers for ECO 2 RR.
研究领域:
材料科学
·
电催化
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Xuefeng Liu,Honghong Wang,Long Dong,Kezhuo Li,Haijun Zhang,Quanli Jia,Shaowei Zhang,Wen Lei
High entropy oxides (HEOs) with ideal element tunability and enticing entropy-driven stability have exhibited unprecedented application potential in electrochemical lithium storage. However, the general control of dimension and morphology remains a major challenge. Here, scalable HEO morphology modulation is implemented through a salt-assisted strategy, which is achieved by regulating the solubility of reactants and the selective adsorption of salt ions on specific crystal planes. The electrochemical properties, lithiation mechanism, and structure evolution of composition- and morphology-dependent HEO anode are examined in detail. More importantly, the potential advantages of HEOs as electrode materials are evaluated from both theoretical and experimental aspects. Benefiting from the high oxygen vacancy concentration, narrow band gap, and structure durability induced by the multi-element synergy, HEO anode delivers desirable reversible capacity and reaction kinetics. In particular, Mg is evidenced to serve as a structural sustainer that significantly inhibits the volume expansion and retains the rock salt lattice. These new perspectives are expected to open a window of opportunity to compositionally/morphologically engineer high-performance HEO electrodes.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）