The Experts below are selected from a list of 5016 Experts worldwide ranked by ideXlab platform
Yi Xie - One of the best experts on this subject based on the ideXlab platform.
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Design of Vanadium oxide structures with controllable electrical properties for energy applications
Chemical Society Reviews, 2013Co-Authors: Changzheng Wu, Feng Feng, Yi XieAbstract:The electrical properties of inorganic materials has been a long-standing pursued research topic, and successfully controlling the electrical property of an inorganic material has attracted significant attention for a wide range of energy-related applications, covering energy storage, energy conversion and energy utilization. During the few past decades, Vanadium Oxides have been studied to gain a clear picture of how microstructural characteristics generating the e-e correlations influence the electronic structure of a material, through which the charge concentration, electrical conductivity as well as the metal-insulator transition (MIT), etc., can be precisely controlled, giving promising signs for constructing energy-related devices. In this review, we present an extensive review of the engineering of the microstructures of Vanadium Oxides with control of their electrical properties, and with attempts to rationally construct energy-related devices, such as aqueous lithium ion batteries, supercapacitors for energy storage, and thermoelectric generators for energy conversion. Furthermore, the MIT performance of Vanadium Oxides has also seen tremendous advantages for the applications of "smart windows" and magnetocaloric refrigerators for energy utilization. Collectively, progresses to date suggest that in Vanadium oxide systems, the electrical properties, including electrical conductivity, carrier concentrations, and the MIT performance, were all strongly dependent on the microstructural characteristics at the atomic scale, which have presented extensive promising energy applications covering energy storage, energy conversion and energy utilization.
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Promising Vanadium oxide and hydroxide nanostructures: from energy storage to energy saving
Energy & Environmental Science, 2010Co-Authors: Yi XieAbstract:The great energy demand for fossil fuels impacts air pollution and water pollution, which significantly influences human life today, and thus efficient utilization of energy has directed a global trend towards a diversified energy portfolio, particularly focusing on energy storage and saving applications. Owing to their special structural characteristics, Vanadium Oxides have received particular interest for efficient energy utilization, and the search for new kinds of Vanadium Oxides in the applications of the energy issues has been highlighted in recent years. This review surveys recent advances in tackling energy utilization issues, such as organic electrolyte or aqueous electrolyte lithium-ion batteries (LIB), by the development of Vanadium oxide nanostructures, as well as energy-saving applications, via regulating the desired structure and morphology characteristics of Vanadium Oxides. The nanoarchitectured Vanadium Oxides with valence state from +3 to +5 all seem ripe for further development for the organic-electrolyte LIB application with improved energy density and cycling performance. In addition, solution-based synthesis gives a facile and inexpensive route to grow and assemble their nanoarchitectures for organic-electrolyte LIB applications. Moreover, although the application of Vanadium Oxides in aqueous LIB is still in its infant stage, controlling the morphology and structure of Vanadium Oxides also plays a vital role in the improvement of the aqueous LIB performance. Furthermore, the energy-saving application of Vanadium Oxides, which arises from the smart switching properties, bring us drastic changes in electrical conductivity and near-IR optical properties for the energy-saving application as the “smart window” coatings. The challenges and ongoing research strategies of the application of Vanadium Oxides for efficient energy utilization are also discussed in this review article.
Guozhong Cao - One of the best experts on this subject based on the ideXlab platform.
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superior pseudocapacitive lithium ion storage in porous Vanadium Oxides c heterostructure composite
ACS Applied Materials & Interfaces, 2017Co-Authors: Hongen Wang, Xu Zhao, Kaili Yin, Lihua Chen, Xiaoyu Yang, Wenjun Zhang, Guozhong CaoAbstract:Vanadium Oxides are promising anode materials for lithium-ion batteries (LIBs) due to their high capacity, good safety, and low cost. However, their practical application has been deferred by the p...
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synthesis and enhanced intercalation properties of nanostructured Vanadium Oxides
Chemistry of Materials, 2006Co-Authors: Ying Wang, Guozhong CaoAbstract:Nanomaterials lie at the heart of the fundamental advances in efficient energy storage/conversion and other types of nanodevices in which the surface process and transport kinetics play determining roles. This review describes some recent developments in the synthesis and characterizations of various Vanadium oxide nanostructures including nanowires, nanorolls, nanobelts, and ordered arrays of nanorods, nanotubes, and nanocables for significantly enhanced intercalation properties. The major topic of this article is to highlight the lithium ion intercalation properties of nanostructured Vanadium Oxides for energy storage as well as other applications in sensors, actuators, and transistors.
Jacques Livage - One of the best experts on this subject based on the ideXlab platform.
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Hydrothermal Synthesis of Nanostructured Vanadium Oxides
Materials, 2010Co-Authors: Jacques LivageAbstract:A wide range of Vanadium Oxides have been obtained via the hydrothermal treatment of aqueous V(V) solutions. They exhibit a large variety of nanostructures ranging from molecular clusters to 1D and 2D layered compounds. Nanotubes are obtained via a self-rolling process while amazing morphologies such as nano-spheres, nano-flowers and even nano-urchins are formed via the self-assembling of nano-particles. This paper provides some correlation between the molecular structure of precursors in the solution and the nanostructure of the solid phases obtained by hydrothermal treatment.
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optical and electrical properties of Vanadium Oxides synthesized from alkOxides
Coordination Chemistry Reviews, 1999Co-Authors: Jacques LivageAbstract:Abstract Vanadium Oxides have been synthesized via the hydrolysis and condensation of Vanadium alkOxides VO(OR)3. Different materials are actually obtained depending on the hydrolysis ratio h=H2O/V. Spin-coated alkOxides lead to Vanadium dioxide. These thermochromic VO2 thin films exhibit a metal-insulating transition. They are transparent at room temperature and IR reflecting above 70°C. The transition temperature can be easily modified by doping with other metal cations. Amorphous oxo-polymers are formed via the partial hydrolysis of Vanadium alkOxides. They give optically transparent thin films that could be used in electrochromic display devices. The hydrolysis of Vanadium alkoxide in the presence of an excess of water leads to ribbon-like particles of hydrated oxide V2O5·nH2O. Mesophases are observed in Vanadium oxide gels and sols that exhibit a nematic liquid crystal behavior. They can even be oriented by applying a magnetic field. Anisotropic thick films can be deposited from these gels. They exhibit a strong preferred orientation. Mixed proton and electron conduction is observed in these gels that can be used as reversible cathodes for lithium batteries.
David W Sheel - One of the best experts on this subject based on the ideXlab platform.
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tungsten doped Vanadium Oxides prepared by direct liquid injection mocvd
Chemical Vapor Deposition, 2007Co-Authors: D Vernardou, M E Pemble, David W SheelAbstract:This paper examines the effect of doping on Vanadium(IV) oxide (VO2 (M)) coatings on glass, using atmospheric-pressure, direct liquid injection metal-organic (DLI-MO)CVD, which potentially may find application as part of smart glazing units. It is found that tungsten-doped VO2 (M) deposited on commercial SiO2-precoated glass using a 0.1 M solution of vanadyl(IV) acetylacetonate (VO(acac)2) and tungsten (VI) ethoxide (W(OC2H5)5) in methanol shows a reduction in thermochromic transition temperature (Tc) from 60 °C in VO2 (M) to 35 °C in V0.98W0.02O2. This finding is discussed in terms of various atomic percentages of tungsten and oxygen flow rates. The crystallinity, composition, morphology, optical properties, uniformity, and oxidation phase of the films are evaluated by X-ray diffraction (XRD), Rutherford backscattering spectroscopy (RBS), scanning electron microscopy (SEM), IR reflectance-transmittance, and Raman spectroscopy, respectively. The relationship between dopant concentration and Tc in the most applicable range for solar window coatings is refined by formation of a single-phase film and precise determination of these parameters.
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Vanadium Oxides prepared by liquid injection mocvd using vanadyl acetylacetonate
Surface & Coatings Technology, 2004Co-Authors: D Vernardou, M E Pemble, David W SheelAbstract:Atmospheric pressure liquid injection MOCVD was used for the deposition of Vanadium oxide coatings using vanadyl acetylacetonate as precursor in methanol solution. The deposition was carried out on SiO2-precoated glass using oxygen flow rates of 0, 0.02, 0.04, 0.06 and 0.08 L/min over the temperature range 375–450 °C. For growth at the highest temperatures studied, which gave the best results in terms of film crystallinity, the influence of oxygen flow rate on the degree of crystallinity, microstructure and morphology of the films was studied in detail. The films were characterized by X-ray diffraction, IR reflectance-transmittance, Raman microscopy and scanning electron microscopy. Results obtained demonstrate the thermochromic properties of Vanadium oxide films at a switching temperature at 60 °C together with the fact that liquid injection MOCVD is an efficient method of producing Vanadium dioxide using vanadyl acetylacetonate as precursor. The capability to control the microstructure and properties of VO2 films grown on SiO2-precoated glass by altering the process parameters can be significant for certain practical applications of thermochromic coatings, such as ‘smart windows’.
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intelligent window coatings atmospheric pressure chemical vapour deposition of Vanadium Oxides
Journal of Materials Chemistry, 2002Co-Authors: Troy D. Manning, Ivan P Parkin, David W Sheel, Robin J H Clark, M E Pemble, Dimitra VernadouAbstract:Thin films of the Vanadium Oxides, V2O5, VO2, VOx (x = 2.00–2.50) and V6O13 were prepared on glass substrates by atmospheric pressure chemical vapour deposition (APCVD) of Vanadium tetrachloride and water at 400–550 °C. The specific phase deposited was found to be dependent on the substrate temperature and the reagent concentrations. The films were characterised by Raman microscopy, X-ray diffraction (XRD), Rutherford backscattering (RBS), scanning electron microscopy (SEM), energy dispersive analysis by X-rays (EDX), reflectance/transmittance and UV absorption spectroscopy. The VO2 films show by Raman microscopy and reflectance/transmittance spectroscopy, reversible switching behaviour at 68 °C associated with a phase change from monoclinic (MoO2 structure) to tetragonal (TiO2, rutile structure).
Feiyu Kang - One of the best experts on this subject based on the ideXlab platform.
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layered Vanadium Oxides with proton and zinc ion insertion for zinc ion batteries
Electrochimica Acta, 2019Co-Authors: Liubing Dong, Baozheng Jiang, Yongfeng Huang, Xianli Wang, Chengjun Xu, Zhuang Kang, Feiyu KangAbstract:Abstract Rechargeable zinc ion battery is considered as a very promising energy storage system due to its high safety, low cost, and environmentally friendliness. Vanadium Oxides with high capacity, good rate performance, and excellent cycle life are important cathode materials for zinc ion batteries. Herein, V10O24.12H2O(VOH) with large interlayer spacing and high valence state is prepared by a facile hydrothermal method and used as the cathode material in zinc ion battery. The Zn/VOH battery delivers a capacity of 327 mAh g−1 at 0.1 A g−1, and exhibit excellent cycling performance with high retention capacity (115 mAh g−1) after 3000 cycles at 1 A g−1. Zinc ion and proton insertion mechanism is proposed by exploring the evolutions of the phase and morphology. Zinc ion and proton insertion mechanism is verified by different zinc salt electrolytes. The reaction kinetics tests of Zn/VOH (galvanostatic intermittent titration technique (GITT) and electrochemical impedance spectroscopy (EIS)) indicate that the zinc ion insertion process has fast reaction kinetics and the proton insertion process slows down the reaction kinetics. The research of Zn/VOH system expand the cathode material of zinc ion battery and enrich the comprehension of zinc ion battery reaction mechanism.
