Silicotungstic acid capacitor

Capacitance characteristics of carbon-based electrochemical capacitors …

The environmental stability of a solid silicotungstic acid (SiWA)-H3PO4-poly(vinyl alcohol) (PVA) electrolyte in electrochemical supercapacitor (EC) applications was improved by the incorporation of … Expand

Silicotungstic acid as a highly efficient coreactant for luminol ...

Herein, we report luminol–silicotungstic acid (STA) chemiluminescence (CL) for the first time. The luminol–STA system resulted in remarkable CL enhancement (65 times) compared with the known classical luminol–H 2 O 2 system because of the generation of the strong oxidizing agent tungsten trioxide from STA. Based on the quenching effect of uric …

Magdalena SKUNIK-NUCKOWSKA | Professor (Assistant) | PhD

The key factors influencing the application of Keggin-type silicotungstic acid electrolyte, H4SiW12O40 (SiW12), in electrochemical capacitors are considered here by means of electrochemical, N2 ...

Tungstosilicic acid 12027-43-9

Synthesis and characterization of hybrid molecular material prepared by ionic liquid and silicotungstic acid. Rajkumar T and Rao G R. Materials Chemistry and Physics, 112(3), 853-857 (2008) Synthesis, properties and photochromism of novel charge transfer compounds with Keggin anions and protonated 2, 2?-biquinoline.

Anti-freezing aqueous electrolytes for electric double-layer capacitors …

With a combination of 40 wt.% sulfuric acid solution as the electrolyte, the working temperature of the MXene electrode extends to -60 °C. The electrode exhibits temperature-insensitive performance at a low scan rate, and the capacity of MXene (88 mAh g −1 at 5 mV s −1 ) stays almost constant when the temperature decreases from 20 to …

High rate all-solid electrochemical capacitors using proton …

Semantic Scholar extracted view of "High rate all-solid electrochemical capacitors using proton conducting polymer electrolytes" by Han Gao et al. ... Polymer electrolytes comprised of silicotungstic acid (SiWA) in cross-linked polyvinyl alcohol have been developed and characterized for ultra-high rate electrochemical capacitors (ECs). …

Silicotungstic acid-supported C@SiO2 nanospheres as an …

Keggin-type silicotungstic acid (SiW 12)-supported on the silica gel microspheres modified with a thin carbon layer (SiW 12 @C@SiO 2) was successfully synthesized through one-step in-situ pyrolysis of the precursor, which was consisted of a SiO 2 core and a shell made up of cross-linked polyvinylimidazole (CPVI) and SiW …

Heteropoly Acid Electrolytes for Double-Layer Capacitors and ...

The key factors influencing the application of Keggin-type silicotungstic acid electrolyte, H4SiW12O40 (SiW12), in electrochemical capacitors are considered here by means of electrochemical, N2 ...

Development of New Cellulose-Based Hydrogel Membranes for …

Electrochemical double-layer capacitors (EDLCs), also known as supercapacitors are a class of energy storage devices that store the energy due to the …

： The key factors influencing the application of Keggin-type silicotungstic acid electrolyte, H 4 SiW 12 O 40 (SiW 12), in electrochemical capacitors are considered here by means of electrochemical, N 2 adsorption, and Differential Scanning Calorimetry analysis. A series of activated carbons has been selected in order to match the porous structure of …

Chemical Stability via Radical Decomposition Using Silicotungstic Acid ...

In this study a 50 cm 2 fuel cell was fabricated using a thin, 25 μm membrane with covalently attached silicotungstic acid, ... Effect of high-pressure deuterium annealing with high-κ stack onto In 0.53 Ga …

Factors affecting performance of electrochemical capacitors …

The key factors influencing the application of Keggin-type silicotungstic acid electrolyte, H 4 SiW 12 O 40 (SiW 12 ), in electrochemical capacitors are considered here by means …

Solid polymer electrochemical capacitors using heteropoly acid ...

Request PDF | Solid polymer electrochemical capacitors using heteropoly acid electrolytes | An electrochemical capacitor utilizing a polyvinyl alcohol (PVA) and H4SiW12O40 (SiWA) solid polymer ...

Polyvinyl alcohol-heteropoly acid polymer electrolytes and their ...

The key factors influencing the application of Keggin-type silicotungstic acid electrolyte, H 4 SiW 12 O 40 (SiW 12), in electrochemical capacitors are considered here by means of electrochemical, N 2 adsorption, and Differential Scanning Calorimetry analysis. A series of activated carbons has been selected in order to match the porous …

Effect of SiO2 on Silicotungstic Acid-H3PO4-poly(vinyl alcohol ...

The environmental stability of a solid silicotungstic acid (SiWA)-H3PO4-poly(vinyl alcohol) (PVA) electrolyte in electrochemical supercapacitor (EC) applications was improved by the incorporation of nano-SiO2. Under ambient conditions, enhanced water retention and improved stability were observed for the electrolyte with SiO2 compared to the electrolyte …

Silicotungstic Acid Impregnated MCM-41-like Mesoporous Solid Acid …

In this study, mesoporous nanocomposite silicotungstic acid (STA) incorporated MCM-41 and mesoporous aluminosilicate catalysts with narrow pore size distributions, in the range of 2.5–3.5 nm, were successfully synthesized following different impregnation procedures. Results showed that the catalyst preparation procedure had …

High rate all-solid electrochemical capacitors using proton conducting ...

This high rate performance is enabled by a proton conducting ternary solid thin film electrolyte composed of silicotungstic acid, orthophosphoric acid, and polyvinyl alcohol. ... capacitors with polymer electrolytes have been developed. The capacitors include graphite electrodes and heteropoly acid in PVA electrolyte. The …

Decoupled catalytic hydrogen evolution from a molecular metal …

The electrolysis of water using renewable energy inputs is being actively pursued as a route to sustainable hydrogen production. Here we introduce a recyclable redox mediator (silicotungstic acid) that enables the coupling of low-pressure production of oxygen via water oxidation to a separate, catalytic hydrogen production step outside the …

Monovalent silicotungstate salts as electrolytes for electrochemical ...

Lithium, sodium, and potassium salts of silicotungstic acid were synthesized and characterized as aqueous neutral electrolytes for electrochemical supercapacitors. The acidity of the aqueous solution and the structure of the solid-state anion were examined to confirm the presence of SiW salts. ... Electric double layer …

[PDF] Optimization of Epoxypinane Synthesis by Silicotungstic Acid ...

Silicotungstic acid supported on SBA-15 (SiW12/SBA-15) has been synthesized under hydrothermal conditions and characterized with various analytical and spectroscopic techniques including X-ray diffraction (XRD), N2 adsorption, transmission electron micrographs (TEM), and Fourier transform infrared spectroscopy (FT-IR). The …

： . c 2 h 4 + ch 3 cooh → ch 3 cooc 2 h 5. ：: [1]. c 2 h 4 + o 2 → ch 3 cooh. 。,20-30%,。

Anhydrous gel electrolytes doped with silicotungstic acid

Solid-polymer electrolytes comprised of silicotungstic acid (SiWA) in a polyvinyl alcohol (PVA) matrix were developed for electrochemical capacitors (ECs). Addition of phosphoric acid has further … Expand

Keggin Type Silicotungstic Acid As Electrolyte for Liquid and …

In the present study we extend this concept on application of Keggin-type silicotungstic acid, H 4 SiW 12 O 40 (SiW 12) as electrolyte operating down to -30°C. Five different activated carbon materials have been selected for electrochemical testing in order to match the porous structure of the electrode to a fairly large SiW 12 O 40 4- anion ...

Keggin Type Silicotungstic Acid As Electrolyte for Liquid and Solid ...

It has been shown that for carbon materials with adequately wide pore size distribution in the microporous range, the electrical parameters of a capacitor, such as …

Heteropoly Acid Electrolytes for Double-Layer Capacitors and ...

Two heteropoly acids, phosphotungstic acid (PWA) and silicotungstic acid (SiWA), were studied as aqueous electrolytes for applications on electrochemical storage …