CERAMICS INTERNATIONAL
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2021
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IF 4.527
Rui Jia Liu,Ling Xu Yang,Ying Wang,Hui Jun Liu,Sheng Long Zhu,Chao Liu Zeng
High-purity ternary layered carbide V 2 AlC powders have been prepared by a two-step modified molten salt method, i.e. by firstly synthesizing V 2 C with V and C powders at 900 °C, followed by preparing V 2 AlC with V 2 C and Al powders as reactants at 900–950 °C in molten (Na,K)Cl. The average particle distribution of V 2 AlC powders was estimated to be ~400 nm. Molten salt as a reaction medium could promote the synthesis of V 2 C and V 2 AlC at lower temperatures. The synthesizing mechanisms of V 2 C and V 2 AlC in molten salts have also been discussed.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2022
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IF 12.92
Chao Li,Chenjie Song,Hui Li,Liqun Ye,Yixue Xu,Yingping Huang,Gongzhe Nie,Rumeng Zhang,Wei Liu,Niu Huang,Po Keung Wong,Tianyi Ma
ABSTRACT Vanadium-based catalysts are considered the most promising materials to replace cobalt-based catalysts for the activation of peroxymonosulfate (PMS) to degrade organic pollutants . However, these traditional vanadium species easily leak out metal ions that can affect the environment, even though the of vanadium is much less than that of cobalt. Compared to other vanadium-based catalysts, e.g., V 2 O 3 , fluorinated V 2 AlC shows a high and constant activity and reusability regarding PMS activation. Furthermore, it features extremely low ion leakage. Active oxygen species scavenging and electron spin resonance measurements reveal that the main reactive oxygen species was 1 O 2 , which was induced by a two-dimensional confinement effect. More importantly, for the real-life application of tetracycline (TC) degradation, the introduction of fluorine changed the adsorption mode of TC over the catalyst, thereby changing the degradation path. The intermediate products were detected by liquid-chromatography mass spectroscopy (LC-MS), and a possible degradation path was proposed. The environmental impact test of the decomposition products showed that the toxicity of the degradation intermediates was greatly reduced. Therefore, the investigated ultradurable catalyst material provides a basis for the practical application of advanced PMS oxidation technology.
研究领域:
环境科学
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催化材料
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化学工程
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
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2025
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IF 6.7
Dongfang Ji,Jiaqi Han,Junwei Ding
Although two-dimensional (2D) non-van der Waals (non-vdW) heterostructures with intriguing physical and chemical merits have the potential application in rechargeable batteries, they still lack valid synthetic methods due to their three-dimensional chemical bonding characteristics. Here, a facile one-step method to synthesize the 2D non-vdW V 8 C 7 /V 2 O 3 heterostructure based on the conversion of V 2 AlC MAX phase in the molten copper chloride is developed. Accompanied with the aluminium layer etching, the V 2 AlC precursor is transformed into the intermediate product (i.e., 2D non-vdW V 8 C 7 ). Interestingly, an operando conversion from the intermediate 2D non-vdW V 8 C 7 to the final 2D non-vdW V 8 C 7 /V 2 O 3 heterostructure is achieved via the extrinsic adsorbed oxygen. Similarly, other types of halogenated salts, including copper bromide and cuprous iodide, can also be as etchants to obtain the 2D non-vdW V 8 C 7 /V 2 O 3 heterostructure. Owing to the 2D character and unique hetero-structure, the obtained 2D non-vdW V 8 C 7 /V 2 O 3 heterostructure can be used as a superior cathode of sodium metal batteries. Meanwhile, the resultant 2D non-vdW V 8 C 7 /V 2 O 3 heterostructure can also enhance the whole performance of aqueous zinc-iodine batteries. This new construction method of 2D non-vdW heterostructures facilitates the development of high-performance rechargeable batteries.
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2022
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IF 5.532
Zetan Liu,Jingkun Xu,Xiaoqing Xi,Weijia Luo,Ji Zhou
Since the synthesis of non-oxidized ceramic and alloy powders requires both high temperature and oxygen insulation conditions, here we demonstrate a cost-efficient molten salt sealing/shielded synthesis method with dynamic gas tightness. Compared to conventional synthesis method, it can prevent the loss of reaction materials at high temperature, cut off the connection between reacting material and outside air, and does not require long-time ball milling mixing treatment or provision of applied pressing before or during heating. Only low-cost salts (e.g., NaCl, KCl), a few minutes of raw material mixing, and regular heating molds are required to obtain high-purity (>96 wt%), micron-sized Ti 3 AlC 2 and Ti 3 SiC 2 powders with narrow size distribution, which significantly decreased the complexity and production costs in the synthesis process. The effect of temperature and raw material content on the products were investigated. The mechanism of diffusion reaction between reactants in molten salt environment was analyzed. The new method developed here was also applicable to Ti 2 AlC, V 2 AlC and Cr 2 AlC MAX phases, as well as provided new ideas for the preparation of other MXenes precursors with certain stoichiometric ratios, air-sensitive materials and nanopowders .
研究领域:
材料科学
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化学工程
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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）