Tungsten Oxide

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Chemically Pure Sodium Tungstate 1,039

Chemically pure sodium tungstate is a good inhibitor for carbon steel in simulated seawater, and the inhibition efficiency increased with the increase of inhibitor concentration, and the adsorption of sodium tungstate onto the surface of carbon steel followed the amended Langmuir adsorption isotherm equation. Composite of sodium tungstate and SLS has better corrosion performance than that of sodium tungstate alone, which shows excellent synergistic effect. Compound inhibitor has higher efficiency, with lower Tafel slope on the cathode and anode and…

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High Purity Sodium Tungstate Dihydrate 1,104

High purity sodium tungstate dihydrate is a colorless or white crystalline powder that can be decomposed by strong acids into tungstic acid (water-insoluble). It is easily weathered in dry air. And it is stable in air, but heated to lose crystal water into anhydrous salt at 100°C. Besides, it is soluble in water and insoluble in ethanol. High purity sodium tungstate dihydrate can be applied for the preparation of tungstic acid, and tungstate, etc. And it can also be used…

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99.5% Tungstic Acid 708

99.5% tungstic acid may be prepared by “dissociation-slurrying-acid decomposition” process. This process uses less raw materials and auxiliary materials. And it is easy to operate. So, it is cost-saving and time-saving. Some people have conducted experiments on acid decomposition of tungstic acid, acid decomposition of ammonium paratungstate (APT), and acid decomposition of CaWO4 to make tungstic acid. The first two methods have been found to be slow to decompose. As the decomposition reaction proceeds, the acidity decreases continuously, so that…

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Hydrogen Molybdenum Tungsten Bronze 429

Hydrogen molybdenum tungsten bronze (HxMo(W)O3, 0<x≤2) may be used as electrocatalyst for direct small organic molecule fuel cell. Platinum Modified with Hydrogen Molybdenum Tungsten Bronze as Electrocatalyst for Direct Small Organic Molecule Fuel Cell There are several problems that limit the application of direct small organic fuel cell, including the use of precious platinum and the activity loss of platinum due to the intermediates poisons from the oxidation of small organic molecules. These problems have attracted wide interest and many…

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Ammonium Tungsten Bronze 430

Ammonium tungsten bronze may be prepared by thermal reduction of ammonium paratungstate (APT). APT Thermal Reduction to Prepare Ammonium Tungsten Bronze 1. Experiment Equipment Three-stage heating tube type resistance furnace is used; Zone of constant temperature of the furnace tube is 300mm; The temperature difference is ±8°C; And the potentiometer automatically records the temperature. 2. Experiment Steps 10g APT was placed in a platinum boat, and the boat was placed in a quartz reactor, filled with nitrogen (N2) for more…

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Potassium Tungsten Bronze 439

Potassium tungsten bronze (KxWO3) may be prepared by hybrid microwave method using K2WO4, WO3 and W powder as raw materials. With the increase of nominal potassium content x, the crystal structure of KxWO3 transforms from hexagonal (0.20≤x≤0.33) to tetragonal (0.50≤x≤0.60). The tetragonal potassium tungsten bronze show metallic behavior. The hexagonal potassium tungsten bronze show semiconducting behavior and the charge density wave (CDW) transition is observed in K0.22WO3 around 265K. The KxWO3 has two types of crystal structure, hexagonal structure and…

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Sodium Tungsten Bronze 423

Sodium tungsten bronze (NaxWO3, 0<X<1) may be prepared by low temperature hydrothermal synthesis method. Low Temperature Hydrothermal Synthesis of Sodium Tungsten Bronze 1. Add dilute hydrochloric acid to 0.25 mol?L-1 Na2WO4 solution dropwise under stirring until the pH is around 6.5. 2. The NaBH4 solution was dropped into the Na2WO4 solution at a rate of 2~4d/s. 3. Keep the pH of the solution at 6.5±0.2 by adding dilute hydrochloric acid dropwise. 4. The obtained dark green suspension was allowed to…

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Hydrogen Tungsten Bronze 447

Hydrogen tungsten bronze (HxWO3, 0≤x≤1) may be used as a co-catalyst in combination with platinum, thereby reducing the usage amount of platinum (The cost of platinum is high) and increasing the catalytic activity of platinum. Hydrogen tungsten bronze combines with the adsorbed hydrogen which has not been completely dissociated on platinum surface, thus increasing the rate of hydrogen oxidation reaction. At the same time, HxWO3 has the ability to provide protons after accepting a large number of protons. These protons…

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Platinum-hydrogen Tungsten Bronze 358

Platinum-hydrogen tungsten bronze may be applied as catalyzer. The Electroxidation of Methonal on Platinum-hydrogen Tungsten Bronze Direct methanol fuel cells (DMFCs) have been studied extensively due to their low operating temperature (<1008°C) and the fast start-up for applications such as portable and stationary power sources and electric vehicular applications. However, slow kinetics of methanol oxidation is one of problems that retard the practical application of DMFCs. Recently, semi-conductive metal oxides such as WO3, MoO3, and V2O5 were considered as a…

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Tantalum Tungsten Bronze 352

Tantalum tungsten bronze (TaxWO3) may be synthesized via hydrothermal method using TaCl5 and Na2WO4?2H2O as raw materials. The TaxWO3 synthesized at 170°C for 48h is hexagonal with the size of about 10~50nm. And TaxWO3 has a strong electrocatalytic activity for hydrogen evolution reaction. The morphology, crystal structure and optical properties of synthesized products were characterized by means of XRD, TEM, SEM, UV-vis and Raman technologies. In addition, the electrocatalytic activity for hydrogen evolution reaction was also investigated by cyclic voltammetry.…

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