Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 46
·14555-14561
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IF 0
Chengxiang Shi,Shaoxin Deng,Jingui Wang,Pingchuan Sun,Tiehong Chen
Hierarchically mesoporous silica nanorods with well-ordered cubic Fm-3m mesostructure were fabricated for the first time under basic conditions by using cationic surfactant cetyltrimethylammonium bromide (CTAB) as a template with poly(acrylic acid) (PAA) and triblock copolymer Pluronic P123 (PEO20PPO70PEO20) as co-templates. Due to the electrostatic interaction between CTAB and PAA, they would co-assemble to form complex colloids. The nonionic surfactant P123 would also be incorporated into the complex. The CTA/PAA/P123 complex colloids exhibited the morphology of nanorods, and the morphology of the final product inherited from the complex. The ordered mesopores (∼3 nm) of hierarchically mesoporous silica were connected with the secondary mesopores, whose average pore size was about 20 nm. Interestingly, the existence of the secondary mesopores did not disturb the ordered mesostructure of the nanorods and thus all the nanorods remained as single-crystalline mesoporous silica crystals. By varying the average molecular weight of the triblock copolymers, we could obtain hierarchically mesoporous silica with 2-D hexagonal mesostructure, which had a high surface area (∼980 m2 g−1) and large pore volume (∼1.3 cm3 g−1). Au-supported hierarchically mesoporous silica nanorods exhibited much higher reaction rate than that of Au-supported MCM-41 in catalytic reduction of 4-nitrophenol, as a result of its unique hierarchically mesoporous structure.
研究领域:
材料科学
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化学工程
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产品关联
DOI
INORGANIC CHEMISTRY
·
2016
·
IF 4.82
Qing Sun,Guanyun Zhang,Chen-Ho Tung,Yifeng Wang
Herein we report the syntheses and the X-ray structure of [Cs8X27]19- (X = Cl, Br) clusters, the first binary cluster anions isolated in bulk crystal structures. They were obtained by electrostatic capture and face-directed recognition of the prenucleation [CsmCln](n−m)– clusters from water solutions, using [M4(OH)8(OH2)16]8+ (M = ZrIV or HfIV) as the counter cations. These compounds have been thoroughly characterized with a variety of techniques including vibrational spectroscopy and superionic conductivity analysis. This work not only provides structural models for a better understanding of the nucleation of binary materials but also shows that magic number binary clusters adopting a cubic lattice structure do form, in agreement with the time-honored theoretical and spectroscopic predictions.
研究领域:
无机化学
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材料科学
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晶体学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2021
·
IF 3.871
Hairui Xing,Ping Hu,Jiayu Han,Shilei Li,Songwei Ge,Xingjiang Hua,Boliang Hu,Fan Yang,Kuaishe Wang,Pengfa Feng
Molybdenum metal have high brittleness and ductile-to-brittle transition temperature (DBTT) due to the existence of interstitial oxygen impurities, so it is of great scientific significance to strictly control and accurately analyze the oxygen content. In this work, the effects of oxygen on microstructure and evolution mechanism of body-centred-cubic metallic molybdenum are studied. The X-Ray diffraction (XRD), oxygen nitrogen analyzer, scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and electron probe micro-analyzer (EPMA) are used to analyze the chemical composition, microstructure, oxygen existence and distribution form. The results demonstrate that Mo O specimens with up to 3300 ppm of oxygen content have single-phase body-centered cubic microstructure with no precipitates. When the oxygen content in molybdenum increases from 44 ppm to 2200– 3300 ppm, more oxygen exists in the pores between molybdenum grains, and the fracture mode changes from intergranular fracture to intergranular and transgranular mixed fracture. The microhardness increases with increase of oxygen content. These results provide new ideas for controlling the change trend of oxygen in molybdenum and regulating the properties of molybdenum.
研究领域:
材料科学
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金属学
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Yu Han,Yonghui Chen,Xueting Pei,Maolin Zhang,Dongyan Zhang,Zhimin Li,Guozhong Cao,Yuan Wang
The development of Li 7 La 3 Zr 2 O 12 solid state electrolyte is retarded by its low ionic conductivity and surface passivation. A few studies suggest those two hurdles can be solved together. Capitalizing on similar physical and chemical properties of Hf 4+ and Zr 4+ , Hf 4+ doped Li 7 La 3 Zr 2- x Hf x O 12 ( x = 0.3, 0.4, 0.5, and 0.6) is prepared and the influence of Hf 4+ on the structure and electrochemical performance of LLZO is investigated systematically. LLZO with Hf 4+ doping is transformed into cubic phase, and also reduces the secondary reaction between H 2 O, CO 2 and LLZO, while increasing the ionic conductivity of the electrolyte to 2.01 × 10 −4 S cm −1 . The electrochemical window between the LLZHO and lithium metal reaches 4.7 V, which is 0.8 V higher than that of LLZO. The specific capacity of the 1st discharge of the all-solid-state batteries assembled with the LiFePO 4 cathode at 0.1C reaches 110.00 mAh·g −1 . The coulombic efficiency reaches 99.18 % after 100 cycles, and the cycle retention rate is 65.82 %.
研究领域:
材料科学
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电化学
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DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 24
·期 3
·620-627
·
IF 3.545
Wei Zhan,Nan Li,Shixiang Zuo,Zhimin Guo,Chenghong Qiang,Zhengping Li,Jiangquan Ma
The rational design and synthesis of electrocatalysts for hydrogen evolution reaction (HER) remain great challenges. Herein, cubic RuSe2 (c-RuSe2) electrocatalysts with different 1T phase ratios (ranging from 20.53% to 64.97%) and crystallinities (ranging from 1.72% to 89.10%) were developed by a fast and efficient microwave-assisted synthesis method. Remarkably, the c-RuSe2 calcined at 500 °C (RuSe2-500) with 45.46% 1T phase and 86.75% crystallinity exhibited a small overpotential of 29 mV at 10 mA cm−2 and a Tafel slope of 64 mV dec−1, close to the commercial Pt/C (31 mV, 53 mV dec−1) and better than most of the reported materials. The enhanced performance of RuSe2-500 could be attributed to the crystallinity, and the 1T phase content reached a certain equilibrium at 500 °C. Moreover, RuSe2-500 had the smallest charge transfer resistance, mainly due to its abundant active centers and excellent conductivity brought by the 1T phase, which were in favor of the HER kinetics and catalytic performance. This study explored the relationship between the ratio of the 1T phase and crystallinity in c-RuSe2, and gives a new pathway to improve the activity by synergistic regulation.
研究领域:
材料科学
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电化学
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DOI
高影响因子
ENVIRONMENTAL RESEARCH
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2022
·
IF 8.431
Weixing Han,Ying Huang,Minhua Su,Heyao Liu,Congjie Shen,Ying Zhou,Tao Ou,Diyun Chen
Cesium (Cs) is a byproduct of nuclear bombs, nuclear weapons testing , and nuclear fission in nuclear reactors. Cs can enter the human body through food or air and cause lasting damage. Highly efficient and selective removal of 137 Cs from low-level radioactive effluents (LLREs), which contain many radionuclides and dissolved heavy metal species, is imperative for minimizing LLRE volume, and facilitating their final disposal. Prussian blue analogs (PBAs) have received much attention as materials for the removal of radioactive Cs because of their affinity for adsorbing Cs + . In this study, an inexpensive and readily available cyanide-based functional material (PBA Cu ) exhibiting high efficiency and excellent selectivity toward Cs capture was designed through a facile low-temperature co-precipitation process. Nano-PBA Cu , crystallizing in the cubic space group ( Fm-3m (225)), has an average pore size of 6.53 nm; consequently, PBA Cu can offer abundant atomic occupation sites for capturing and incorporating Cs. Here, the pseudo-second-order kinetic model and Langmuir model fitted well with the adsorption of Cs + on PBA Cu , with a maximum capture capacity of 95.75 mg/g within 5 min, confirming that PBA Cu could rapidly capture Cs ions . PBA Cu strongly and selectively interacted with Cs even in a simulant containing large Na + , NH 4 + , Ca 2+ , and Mg 2+ ion concentrations in an aqueous solution. The process of Cs + adsorption by cyanide-based functional crystals was confirmed to involve the entry of Cs + into cyanide-based functional crystals to replace K + and finally achieve the lattice incorporation of Cs. The current results broaden the lattice theory of radionuclide Cs removal and provide a promising alternative for the immobilization of Cs from radioactive wastewater .
研究领域:
核科学
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环境工程
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材料科学
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化学工程
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DOI
PubMed
高影响因子
Journal of Energy Chemistry
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2024
·
IF 14
Yunbo Li,Jianchao Yue,Chaoyi Yang,Hongnan Jia,Hengjiang Cong,Wei Luo
Metastable nanostructured electrocatalyst with a completely different surface environment compared to conventional phase-based electrocatalyst often shows distinctive catalytic property. Although Ru-based electrocatalysts have been widely investigated toward hydrogen oxidation reaction (HOR) under alkaline electrolytes, these studies are mostly limited to conventional hexagonal-close-packed ( hcp ) phase, mainly arising from the lack of sufficient synthesis strategies. In this study, we report the precise synthesis of metastable binary RuW alloy with face-centered-cubic ( fcc ) phase. We find that the introduction of W can serve as fcc phase seeds and reduce the formation energy of metastable fcc -RuW alloy. Impressively, fcc -RuW exhibits remarkable alkaline HOR performance and stability with the activity of 0.67 mA cm Ru −2 , which is almost five and three times higher than that of hcp -Ru and commercial Pt/C, respectively, which is attributed to the optimized binding strength of adsorbed hydroxide intermediate derived from tailored electronic structure through W doping and phase engineering. Moreover, this strategy can also be applied to synthesize other metastable fcc -RuCr and fcc -RuMo alloys with enhanced HOR performances.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2024
·
IF 4.9
Liwei Zhang,Feng Li,Ying Yang,Dan Li,Hui Yu,Xiangting Dong,Tianqi Wang
WO 3 is a representative metal oxide semiconductor gas sensing material with good selectivity and high sensitivity. However, high electron-hole recombination is a common drawback of WO 3 -based gas sensors. Here, we used silicotungstic acid (SiW 12 ), a classical Keggin-type polyoxometalate (POM) as precursor. After oxidation, WO 3 with cubic/orthorhombic mixed-phase were in-situ formed. Gas sensing performances of the WO 3 to ppb-level NO 2 gas were tested to explore whether the POM-derived WO 3 has advantage for gas sensor applications. Surprisingly, the c/o-WO 3 calcined at 800 °C exhibit a response value of 5.239 to 500 ppb NO 2 with very high selectivity, good long-term stability, repeatability and humidity resistance. By mechanism analysis, the bandgap positions of o-WO 3 and c-WO 3 are staggered, forming an internal electric field that favours electron-hole separation and improves the gas sensing performance. This work transforms POMs into two-phase mixed WO 3 , providing a new idea for the application of POMs as precursors in gas sensors.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
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2024
·
IF 3.2
Yunxia Han,Dejiang Ma,Chao Gu,Yu Fu,Yusheng Zhao,Shanmin Wang
Cubic boron nitride (cBN) with superhardness exhibits many exceptional properties rivaling diamond and holds great promise for diverse applications such as advanced cutting tools and high-performance electronic devices, where high-quality single crystals are often highly demanded. However, the synthesis of its large single crystals has been a long-standing challenge, mainly due to a more complex reaction process involved in the growth of cBN when compared with that of diamond, making its growth mechanism largely elusive. In this work, we present a comprehensive investigation on the growth of cBN crystals through a seed method under high pressure using specially designed growth strategies with Li3N as a transport agent, leading to the discovery of the crucial role that the atomic transport rate plays in growing its crystals. The seed crystals are revealed to undergo a reversible cubic → hexagonal → cubic transition sequence at high temperature during a two-step compression process. In addition, the phase diagrams for the formation of cBN in different transport agents are also explored. These findings provide new insights into the mechanism for growing large cBN crystals.
研究领域:
材料科学
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化学
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物理学
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DOI
高影响因子
NANO
·
2026
·
IF 1.3
Zheng Zhang,Bin He,Yunfei Wu,Shaohua Jiang,Yuanyuan Zeng
To address the urgent demand for advanced electrode materials in high-performance aqueous copper-ion batteries (ACIBs), manganese selenide (MnSe 2 ) was successfully synthesized as a cathode material via a facile hydrothermal method. Systematic investigations were conducted to evaluate the effects of hydrothermal reaction temperature and duration on the surface morphology and microstructure of MnSe2, while a comprehensive analysis of the Cu 2+ storage mechanism was also performed. The results demonstrated that MnSe 2 exhibited outstanding electrochemical performance under the optimal hydrothermal conditions of 180°C and 12 h of reaction time. During the Cu 2+ storage process of MnSe 2 , the reversible intercalation behavior of Cu 2+ underwent adaptive adjustment with the transformation of the lattice structure. This unique feature enabled the electrode to maintain a high discharge specific capacity of 572 mAh g -1 after 500 cycles at a current density of 2 A g -1 . Overall, this work provided a practical and highly promising strategy for the design and development of high-performance materials for ACIBs, offering significant implications for advancing the application of ACIBs in next-generation energy storage systems.
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DOI
高影响因子
Materials Today Communications
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2024
·
IF 3.7
Kuan Li,Weijie Lin,Ruixin Guo,Shu Guo,Lingyong Zeng,Longfu Li,Peifeng Yu,Kangwang Wang,Chao Zhang,Huixia Luo
Medium- and high-entropy alloy (MEA and HEA) superconductors have attracted considerable interest since their discovery. This paper reports the superconducting properties of ternary tungsten-containing MEA V 4 Ti 2 W for the first time. V 4 Ti 2 W is a type II superconductor with a body-centered cubic (BCC) structure. This structure belongs to the space group Im 3 ̅ m (No. 229) with the cell parameters a = b = c = 3.10673(14) Å. Experimental results of resistivity, magnetization, and heat capacity indicate that the superconducting transition temperature of the MEA V 4 Ti 2 W is roughly 5.0 K. The critical magnetic fields at the upper and lower ends are 9.93(2) T and 40.7(3) mT, respectively. Interestingly, few BCC MEA superconductors with VEC greater than 4.8 have been found. The addition of tungsten leads to a VEC of 4.83 e/a for V 4 Ti 2 W, which is rarely higher than the 4.8 value. Adding tungsten element expands the variety of MEA alloys, which may improve the microstructure and mechanical properties of materials and even superconducting properties. This material could potentially offer a new platform for the investigation of innovative MEA and HEA superconductors.
研究领域:
材料科学
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凝聚态物理
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DOI
高影响因子
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-12
·
IF 5.228
Yang Tao,Zhang Liqin,Hou Xinmei,Chen Junhong,Chou Kuo-Chih
Fabrication of eletrochemical sensors based on wide bandgap compound semiconductors has attracted increasing interest in recent years. Here we report for the first time electrochemical nitrite sensors based on cubic silicon carbide (SiC) nanowires (NWs) with smooth surface and boron-doped cubic SiC NWs with fin-like structure. Multiple techniques including scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electron energy loss spectroscopy (EELS) were used to characterize SiC and boron-doped SiC NWs. As for the electrochemical behavior of both SiC NWs electrode, the cyclic voltammetric results show that both SiC electrodes exhibit wide potential window and excellent electrocatalytic activity toward nitrite oxidation. Differential pulse voltammetry (DPV) determination reveals that there exists a good linear relationship between the oxidation peak current and the concentration in the range of 50–15000 μmoL L −1 (cubic SiC NWs) and 5–8000 μmoL L −1 (B-doped cubic SiC NWs) with the detection limitation of 5 and 0.5 μmoL L −1 respectively. Compared with previously reported results, both as-prepared nitrite sensors exhibit wider linear response range with comparable high sensitivity, high stability and reproducibility.
研究领域:
材料科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）