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Phosphotungstic acid

About: Phosphotungstic acid is a research topic. Over the lifetime, 1925 publications have been published within this topic receiving 38059 citations. The topic is also known as: Phosphowolframic acid.


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Journal ArticleDOI
15 Apr 2019
TL;DR: When tested in a VRB, the performance of the single cell assembled with the composite membrane greatly outperforms that with recast Nafion at current densities ranging from 40 to 100 mA cm-2.
Abstract: A novel composite vanadium-blocking proton exchange membrane for vanadium redox flow battery (VRB) was designed and constructed by immobilizing phosphotungstic acid (PWA) on Nano Kevlar Fibers (NKFs) via a solution-casting method. The proton/vanadium selectivity of the composite membrane is greatly improved by incorporating the complex formed by NKFs and PWA into the Nafion matrix. Simple tuning of the complex doping quantity results in different composite membranes with superior vanadium barrier properties (namely, a minimum vanadium permeability of 2.46 × 10-7 cm2 min−1). This coupled with proton conductivities reaching 0.061 S cm−1 at room temperature indicates a proton/vanadium selectivity of 2.48 × 105 S min cm−3, which is 6.3 times higher than that of recast Nafion (0.34 × 105 S min cm−3). When tested in a VRB, the performance of the single cell assembled with the composite membrane greatly outperforms that with recast Nafion at current densities ranging from 40 to 100 mA cm−2.

33 citations

Journal ArticleDOI
TL;DR: In this paper, the chemical structures of hybrid membranes were characterized by energy dispersive X-ray spectrometry (EDX) and Fourier transform infrared spectroscopy (FTIR).

33 citations

Journal ArticleDOI
15 Apr 2020-Fuel
TL;DR: In this article, a nano-sized hierarchical hollow silica spheres (HPW-NH2-HHSS) was successfully prepared and completely characterized and applied to simultaneous oxidation and adsorption of dibenzothiophene (DBT) from model fuel.

33 citations

Journal ArticleDOI
Siyuan Rao1, Ruijie Xiu1, Jiangju Si1, Shanfu Lu1, Meng Yang1, Yan Xiang1 
TL;DR: In this article, uniform nanoparticles of cesium hydrogen salts of phosphotungstic acid (CsPW) are controllably synthesized in situ in Nafion to form CsPW-Nafion nanocomposite membranes with both improved proton conductivity and methanol-crossover suppression.
Abstract: In situ synthesis is a powerful approach to control nanoparticle formation and consequently confers extraordinary properties upon composite membranes relative to conventional doping methods. Herein, uniform nanoparticles of cesium hydrogen salts of phosphotungstic acid (CsPW) are controllably synthesized in situ in Nafion to form CsPW–Nafion nanocomposite membranes with both improved proton conductivity and methanol-crossover suppression. A 101.3% increase of maximum power density has been achieved relative to pristine Nafion in a direct methanol fuel cell (DMFC), indicating a potential pathway for large-scale fabrication of DMFC alternative membranes.

33 citations

Journal ArticleDOI
TL;DR: There is not yet general agreement concerning the significance of theLGV, but when phosphotungstic acid is added to the absolute ethanol during the dehydration of glutaraldehyde-fixed tissue, the dense cores of the LGV in the CNS seem to be specifically stained.
Abstract: Fine structural analyses of nerve terminals in both the central and in the peripheral nervous systems have demonstrated the presence of synaptic vesicles, which were postulated to be the storage sites of neurotransmitters . Several different types of synaptic vesicles have been described (see ref . 6) . Electron-lucent vesices, 400-500 A in diameter, constitute the most commonly occurring type in central and in peripheral synapses . Because they are consistently found in cholinergic nerve terminals, these vesicles were postulated to constitute the site of acetylcholine storage, an assumption confirmed by isolation studies (8) . Granulated vesicles, 300-500 A in diameter, with an electronopaque core are characteristic of peripheral adrenergic terminals (7) . Combined pharmacological and electron microscopical studies have shown that these vesicles contain norepinephrine (NE) (19, 20) and also, in nerve endings of rat pineal gland, 5-hydroxytryptamine (5-HT) (16) . The presence of another type of vesicle, a larger one (800-1000 A in diameter) which possesses an internal content of variable density, has been also observed . These large granulated vesicles (LGV) occur in terminals which also contain electron-lucent or granulated vesicles, e.g . postganglionic sympathetic terminals, endings in the sphincter pupillae, preganglionic cholinergic fibers to sympathetic ganglia, preganglionic terminals supplying the adrenal medulla, parasympathetic ganglia, endings and neuronal perikarya of the central nervous system (CNS) of areas rich or poor in monoamines in both vertebrates and invertebrates, stumps of injured peripheral nerves or central tracts, etc . (for bibliography see ref. 12) . There is not yet general agreement concerning the significance of the LGV . When phosphotungstic acid is added to the absolute ethanol (E-PTA) during the dehydration of glutaraldehyde-fixed tissue, the dense cores of the LGV in the CNS seem to be specifically stained (1) . In order to determine the relationship between the LGV in peripheral nerve endings and those of CNS terminals, the reactivity of the former to E-PTA was studied . The possible participation of biogenic amines in the reaction was also analyzed .

33 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202352
2022121
2021102
2020102
2019115
2018126