CRYSTENGCOMM
·
2016
·Vol. 19
·期 1
·171-178
·
IF 3.849
Yan Zheng,Xiao Zhang,Ping Yang
Anatase hexagonal prism TiO2 with high thermal stability was prepared through the decomposition of precursors (HTiOF3). HTiOF3 was firstly synthesized, using a solvothermal method, from n-octanol, tetrabutyl titanate and hydrofluoric acid. The obtained precipitates were then calcined at different temperatures (200–900 °C) for 2 h. The formation process of the hexagonal prism HTiOF3 precursors included three steps: nuclei growth, dissolution–recrystallization and further growth. The morphologies of the precursors depended strongly on the reaction temperature and the amount of solvent. The precursors were transformed into TiO2 after calcination and the effect of the calcination temperature on the morphology and phase composition of the hexagonal prism TiO2 was investigated. The results indicated that the anatase hexagonal prism TiO2 exhibited a rather high thermal stability, maintaining both the anatase structure and precursor shape up to 800 °C. The sample that was calcined at 550 °C exhibited a superior photocatalytic performance.
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 ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jun He,Xiaoyu Qi,Jingjing Liu,Hao Zhang,Zhongliao Wang,Deliang Li,Shuwang Duo
Triethylamine is a typical volatile toxic gas that can cause respiratory system diseases, blood diseases, and eye lesions upon prolonged inhalation. To mitigate this problem, a highly sensitive triethylamine sensor was achieved by loading the precious metal Au onto hexagonal hollow prisms of In 2 O 3 . Prominently, the microstructure of the hollow hexagonal prisms was derived from Material Institute Lavoisier(MIL)-68(In), which provided a larger specific surface area and more active sites. The sensing test results manifested that the sensor based on 0.6% Au/In 2 O 3 owned the best sensing performance among all samples, especially with the response value of 476.3 ( R a / R g ) towards 100 ppm triethylamine at 200°C, which was 37 times higher than that of pristine In 2 O 3 sensor. Additionally, the stability deviation value was less than 5.6% and the selectivity ( Response triethylamine / Response ethanol ) reached up to 28.8. Such distinguished characteristics can be attributed to the delicate hollow hexagonal prisms structure and the decoration of Au, which accelerated gas molecules transport and enhanced oxygen molecule adsorption and dissociation. This work may open up new visas for morphology manipulation of triethylamine sensing materials and intrinsic mechanism of performance enhancement.
研究领域:
材料科学
·
传感器技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Baitong Niu,Meihua Zhu,Hongxu Guo,Shaoming Ying,Xuguang Huang
A hexagonal prisms with hexagonal pyramid tips metal–organic frameworks (MOFs) modified V 2 O 5 nanoparticles , V 2 O 5 @MOF(V, Co) has been fabricated through a simple one-pot hydrothermal reaction and then characterized by XRD, FT-IR, FE-SEM, TEM, XPS and BET. The as-prepared V 2 O 5 @MOF(V, Co) composites were found to be an excellent electrode modification material for electrochemical detection of Pb 2+ in aqueous solution. Operational parameters such as pH, deposition potential, and deposition time, were also optimized to detect trace amounts of Pb 2+ . This study provides a feasible research method and practical strategy for sensitive and sensitive on-line detection of lead ions using novel MOFs composites.
研究领域:
材料科学
·
分析化学
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2015
·Vol. 17
·期 9
·1-12
·
IF 2.184
Han Wenfeng,Li Xiaojuan,Tang Haodong,Wang Zhikun,Xi Miao,Li Ying,Liu Huazhang
Abstract A Cr 2 O 3 hexagonal prism structure synthesized via the reaction of aqueous CrCl 3 solution with NaBH 4 solution at room temperature followed by calcination of the precipitate in N 2 atmosphere at 500 °C is investigated as an efficient catalyst for dehydrofluorination of 1,1-difluoroethane producing vinyl fluoride. With the assistance of scanning electron microscopy, transmission electron microscopy, and high-resolution transmission electron microscopy, experimental results revealed that the uniform hexagonal prism has a prism length of 285 ± 43 nm and width of 233 ± 33 nm. It is in the form of loose and net-like aggregation of nano-Cr 2 O 3 with diameter less than 3–5 nm with polycrystalline structure. NH 3 temperature programmed desorption and chlorodifluoromethane dismutation experiments confirm the existence of relatively abundant and strong acidic sites. As a catalyst for dehydrofluorination of 1,1-difluoroethane, compared with commercial Cr 2 O 3 , much higher activity and stability were observed due to the evolution of CrO
x
F
y
species and much higher surface area and mesoporous structure. No significant morphology changes or sintering of the catalyst are observed after 70-h reaction. Compared with the commercial Cr 2 O 3 , we suggest that the much smaller size of Cr 2 O 3 crystalline which possesses higher surface energy, lower strength, and more abundant Lewis acidity and the formation of CrO
x
F
y
during reaction over hexagonal prism catalyst probably contributes to the activity and stability difference between these two catalysts. Graphical Abstract
研究领域:
材料科学
·
催化化学
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产品关联
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 4
·1407-1418
·
IF 2.8
Quan Lijun,Li Ying,Gu Wenwen,Su Ting,Luo Yunan,Liu Mengjiao,Lai Xin,Bi Jian,Gao Daojiang,Zhao Yan
As a research hotspot in recent years, Ti-based anode materials for lithium ion batteries (LIBs) have advantages including long cycle life and excellent cyclic stability. However, its application is further limited by its poor conductivity and low reversible capacity. Herein, a series of porous hexagonal prism Zn-doped CoTiO 3 have been designed and prepared by simple co-precipitation method followed by calcination. The influences of Zn doping concentration on the microstructure and electrochemical performance are further explored. The results indicate that Zn doping has little effect on the microstructure of CoTiO 3 and can elevate capacity, cyclic stability, and rate capability. When Zn doping concentration is set as 0.1, the sample Co 0.9 Zn 0.1 TiO 3 gives the best electrochemical performance. The reversible capacity can be maintained at 430.6 mAh g −1 at a current rate of 0.2 C after 280 cycles. This work can pave an effective strategy for improving the electrochemical performance of other Ti-based anode materials.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 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）