JOURNAL OF NANOPARTICLE RESEARCH
·
2013
·Vol. 15
·期 9
·1-7
·
IF 2.175
Zong Kai,Lu SiHeng,Wang Hao,Sun YuXiu,Liu JingBing,Yan Hui
Cu 2 ZnSnSe 4 quantum dots (QDs) with controllable sizes have been synthesized via a hot-injection method. The diameters of the QDs range from 3.2 to 10.1 nm with the tunable band gap from 1.27 to 1.54 eV by adjusting the reaction temperatures from 180 to 240 °C. Structural and Raman scattering data confirm that Cu 2 ZnSnSe 4 is obtained without other secondary phases. The band gaps of the QDs with diameters less than 4.6 nm show an obvious blue shift to higher energy due to quantum confinement effect. It indicates that the Cu 2 ZnSnSe 4 QDs can be a potential candidate for quantum-dot-sensitized solar cells in the future.
研究领域:
材料科学
·
纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2013
·Vol. 113
·期 3
·1297-1302
·
IF 1.982
Yan X.,Wang T. B.,Pei H. R.,Wang L. P.,Lan X. Z.
Phase behavior of dodecane–tridecane ( n -C 12 H 26 –C 13 H 28 , C 12 –C 13 ) mixtures in bulk and confined in SBA-15 have been investigated using differential scanning calorimetry. Bulk C 12 –C 13 system has a complicated behavior due to special rotator phase. It has been found that phase diagram of C 12 –C 13 /SBA-15 (3.8 nm) system is a straight line, C 12 –C 13 /SBA-15 (7.8 nm) a curve, and C 12 –C 13 /SBA-15 (8.9, and 17.2 nm) a loop line. The growth of the phase diagram shows size effect on phase behavior of C 12 –C 13 mixtures. Moreover, in the range of 3.8–17.2 nm melting temperatures of pure C 12 and mixtures at mole fractions x
C13 = 0.1–0.5 have linear relation with inverse pore diameter, while C 13 and mixtures at x
C13 = 0.6–0.9 present curved lines. The confined mixtures show a similar melting behavior with pure C 12 , C 13 .
研究领域:
物理化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Shen Zhang,Yuan Rui,Xing Zhang,Rongjia Sa,Feng Zhou,Ruihu Wang,Xiaoju Li
The exploration of the inexpensive and efficient substitutes for platinum-based electrocatalysts is of great challenges for hydrogen evolution reaction (HER). Here, we presented a facile method to achieve highly active, cost-effective and stable HER catalysts, which are composed of ultrafine Co-Ru alloy nanoparticles embedded in heteroatom-free graphitic carbon (Co 1-x Ru x /GC). The optimum catalyst with ruthenium content of 0.93 wt% exhibits remarkable HER activity and the excellent durability, low overpotentials of 14, 39 and 44 mV at −10 mA cm −2 are achieved in alkaline, neutral and acidic media, respectively, which can compete with those in commercial 20 wt% Pt/C and majority of the reported platinum-free catalysts. It has been validated that the confinement effect of SBA-15 induces the formation of ultrafine alloy nanoparticles for generating more active sites. The theoretical simulations reveal that Co-Ru alloy regulates hydrogen adsorption energy to the optimum level, thus resulting in high HER activity. This work provides new methods for the fabrication of ultrafine alloy nanoparticles for the electrocatalysis and other application.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
AICHE JOURNAL
·
2024
·
IF 3.5
Yaning Zhang,Shiyuan Fan,Siqi Gong,Huibin Liu,Huiting Xu,Junjie Qi,Honghai Wang,Chunli Li,Wenchao Peng,Jiapeng Liu
Capacitive deionization (CDI) has attracted significant attention as a water treatment technology owing to its low cost, high efficiency, and eco-friendliness. However, the unsatisfactory desalination performance of traditional electrode materials hinders the development of CDI. Herein, 1T-MoS 2 /C hybrid microspheres are successfully fabricated through confinement and phase engineering strategies. The confinement effect of porous hollow carbon microspheres reduces the overgrowth and agglomeration of MoS 2 nanosheets, which is beneficial for exposing more active sites and enhancing stability. Meanwhile, the 1T phase MoS 2 displays high intrinsic conductivity and large interlayer spacing, which is conducive to rapid insertion/extraction of Na + . Consequently, 1T-MoS 2 /C hybrid becomes a prospect electrode material for CDI, which showcases outstanding desalination capacity (48.1 mg/g at 1.2 V), eminent desalination rate as well as exceptional stability. Moreover, the desalination mechanisms are clarified through various characterizations and density functional theory calculations. This study provides new perspectives on designing high-performance MoS 2 -based CDI electrode materials.
研究领域:
材料科学
·
环境科学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2013
·Vol. 116
·期 1
·469-476
·
IF 1.982
Wang L. P.,Wang T. B.,Gao C. F.,Lan X.,Lan X. Z.
Phase behaviors of dodecane–hexadecane ( n -C 12 H 26 –C 16 H 34 , C 12 –C 16 ) binary mixtures in bulk and confined in SBA-15 (pore diameters 3.8, 9.5, and 17.2 nm) are investigated using differential scanning calorimetry. According to the thermal analysis, the bulk mixtures belong to a system of partial miscibility with two solid solutions and a eutectoid in the range of mole fraction \( x_{{{\text{C}}_{ 1 6} }} \) = 0.1–0.8. Under confinement, phase behavior of C 12 –C 16 mixtures is distinct from the bulk. Inside pores of SBA-15 (3.8 nm), the solid mixtures has only a melting boundary. In the pores larger than 9.5 nm, phase behaviors of the mixtures show some resemblance to the bulk system. The growth of the phase diagram with the pore diameter clearly shows the size effect on the phase behavior of the confined mixtures. In comparison with those of chain length difference of pure components of two carbon atoms or less, C 12 –C 16 mixtures exhibit different phase behaviors not only in the bulk but also in the confined state.
研究领域:
物理化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 7
·606
·
IF 3.444
Chuanmin Ding,Junwen Wang,Yufeng Li,Qian Ma,Lichao Ma,Jing Guo,Zili Ma,Ping Liu,Kan Zhang
The supporting modes of active metal over mesoporous materials play an important role in catalytic performance. The location of Ni nanoparticles inside or outside the mesoporous channel of MCM-41 has a significant influence on the reactivity in partial oxidation of methane to syngas reaction. The characterization data using different techniques (Transmission Electron Microscope (TEM), X-Ray Diffraction (XRD), N2adsorption-desorption, H2Temperature-Programmed Reduction (H2-TPR), and Inductively Coupled Plasma (ICP)) indicated that nickel was located outside the mesoporous channels for the impregnation method (Ni/MCM-41), while nickel was encapsulated within MCM-41 via the one-step hydrothermal crystallization method (Ni-MCM-41). The nickel atoms were mainly dispersed predominantly inside the skeleton of zeolite. When the load amount of Ni increased, both of Ni species inside the skeleton or pore channel of zeolite increased, and the ordered structure of MCM-41 was destroyed gradually. Contributed by the strong interaction with MCM-41, the Ni particles of Ni-MCM-41 were highly dispersed with smaller particle size compared with supported Ni/MCM-41 catalyst. The Ni-MCM-41 displayed higher catalytic performance than Ni/MCM-41, especially 10% Ni-MCM-41 due to high dispersity of Ni. The confinement effect of MCM-41 zeolite also afforded high resistance of sintering and coking for 10% Ni-MCM-41 catalyst. Especially, 10% Ni-MCM-41 catalyst showed outstanding catalytic stability.Keywords:partial oxidation of methane;sintering and coking resistance;Ni location;confinement effect;MCM-41 zeolite
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Chinese Physics B
·
2023
·Vol. 32
·期 1
·017901
·
IF 1.7
Siwen You,Ziyi Shao,Xiao Guo,Junjie Jiang,Jinxin Liu,Kai Wang,Mingjun Li,Fangping Ouyang,Chuyun Deng,Fei Song,Jiatao Sun,Han Huang
Hybrid organic–inorganic perovskite thin films have attracted much attention in optoelectronic and information fields because of their intriguing properties. Due to quantum confinement effects, ultrathin films in nm scale usually show special properties. Here, we report on the growth of methylammonium lead iodide (MAPbI3) ultrathin films via co-deposition of PbI2 and CH3NH3I (MAI) on chemical-vapor-deposition-grown monolayer MoS2 as well as the corresponding photoluminescence (PL) properties at different growing stages. Atomic force microscopy and scanning electron microscopy measurements reveal the MoS2 tuned growth of MAPbI3 in a Stranski–Krastanov mode. PL and Kelvin probe force microscopy results confirm that MAPbI3/MoS2 heterostructures have a type-II energy level alignment at the interface. Temperaturedependent PL measurements on layered MAPbI3 (at the initial stage) and on MAPbI3 crystals in averaged size of 500 nm (at the later stage) show rather different temperature dependence as well as the phase transitions from tetragonal to orthorhombic at 120 and 150 K, respectively. Our findings are useful in fabricating MAPbI3/transition-metal dichalcogenide based innovative devices for wider optoelectronic applications.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 7
·1607
·
IF 3.1
Hang Li,Jiazhen He,Xiaoqian Wang,Qi Liu,Xuemin Luo,Mingwei Wang,Jinfeng Liu,Chengqi Liu,Yong Liu
As a direct band gap semiconductor, perovskite has the advantages of high carrier mobility, long charge diffusion distance, high defect tolerance and low-cost solution preparation technology. Compared with traditional metal halide perovskites, which regulate energy band and luminescence by changing halogen, perovskite quantum dots (QDs) have a surface effect and quantum confinement effect. Based on the LaMer nucleation growth theory, we have synthesized CsPbBr3QDs with high dimensional homogeneity by creating an environment rich in Br−ions based on the general thermal injection method. Moreover, the size of the quantum dots can be adjusted by simply changing the reaction temperature and the concentration of Br−ions in the system, and the blue emission of strongly confined pure CsPbBr3perovskite is realized. Finally, optical and electrochemical tests suggested that the synthesized quantum dots have the potential to be used in the field of photocatalysis.
研究领域:
材料科学
·
光电催化
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2023
·Vol. 36
·期 4
·477-485
·
IF 1
He Ting,Dong Na,Yao Yi,Xu Faqiang
Although lead-based halide perovskites have promising applications in optoelectronic devices, these applications are limited by the toxicity of the materials. Therefore, it is necessary to develop lead-free all-inorganic substitute such as tin-based halide perovskites in spite of the enormous challenges in their controllable synthesis and stability. Here, we report the controlled growth of high quality CsSnBr 3 microcrystals on SiO 2 /Si substrates by chemical vapor deposition method. The as-prepared products pre-dominantly show the morphology of triangle star and nail-like rod and the structure of cubic phase. The control of nucleation density and size of CsSnBr 3 microcrystals has been realized by varying the growth temperature. The results of air-exposed samples explain the structural instability of the tin-based perovskites due to the production of SnO. The power and temperature dependent photoluminescence spectra reveal that CsSnBr 3 microcrystals with different morphologies possess different exciton binding energies and produce different photoexcitation species due to the quantum confinement effect that changes the electron-hole effect.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shuo Li,Linghui Wang,Peng Lu,Yanshuo Li,Ya Li,Yajuan Wang,Lihui Yao,Dan Qiu
Water contamination resulting from the presence of the various coexistent pollutants is an urgent environmental challenge, and effective treatment is demanded to remove the toxic substances. The removal of pollutants by adsorption, as an effective, efficient and economic strategy, has been widely used in water treatment. In this work, PEI@MCM-41 was prepared by infiltrating polyethyleneimine (PEI) into the pores of mesoporous MCM-41, and applied for the removal of heavy metal ions. The adsorption kinetics of Cu 2+ , Ni 2+ and Cd 2+ by PEI@MCM-41 were supposed to be pseudo-second-ordered, and the adsorption capacities were as high as 39.30, 33.67 and 21.10 mg·g −1 , respectively. The influence of temperature, pH, coexistent salt and heavy metal ions concentration on the adsorption performance was studied. Owing to the nanoconfinement effect and hydrogen bond, PEI remained stable during the adsorption and desorption process, and the adsorption capacity for Cu 2+ maintained 84.15 % even after four consecutive adsorption–desorption cycles. This work demonstrates that the potential practical applicability of PEI@MCM-41 as promising adsorbent in the removal of heavy metal ions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Minghui Sun,Muthu Murugananthan,Zhiming Zhou,Yan Shen,Yanrong Zhang,Xiaoguang Wang
Great efforts have been made for H 2 O 2 production by an artificial photosynthetic approach. However, the poor solubility of oxygen in the liquid phase, sluggish mass transfer, and additional concentration step to produce H 2 O 2 have limited the development of this technology. Herein, a unique fluorocarbon/hydrophobic photocatalysts/water system is reported, which ensures an efficient photosynthesis and spontaneous self-separation of H 2 O 2. The presence of an ultra-thin dense gas layer between the perfluorous solvent and the photocatalysts enables rapid oxygen supply through a nano-confinement effect. Thus, a maximum photosynthetic efficiency of 4.9 mM g −1 h −1 of H 2 O 2 is achieved, 6 times higher compared to its counterpart gas–liquid-solid triphase system. Importantly, the independent hierarchical structure of the present system, allows functional applications, such as the Fenton reaction using pre-added Fe 2+ in the aqueous solution. This feature makes the fluorocarbon/water systems is an advantageous one and of extraordinary significance for similar types of gas–liquid reactions.
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2018
·
IF 2.687
Liyun Lv,Jingjing Liu,Hong Wang
Ag 2 S hollow nanospheres were synthesized by reaction between silver dodecanoate and thiourea in the presence of polyvinyl pyrrolidone (PVP) at ambient temperature within 30 min. Characterization studies by X-ray powder diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) showed that the prepared product had a monoclinic structure and was composed of thin shell enwrapped hollow nanospheres. Their large band gap energy of 3.67 eV, remarkable blue shifts both in the ultraviolet-visible (UV–vis) absorption spectrum and the photoluminescence (PL) emission peak could be well explained by the thin shell caused quantum confinement effects.
研究领域:
材料科学
·
纳米技术
✓ 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）