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.

Antistatic coating composition for plastic

Abstract: PURPOSE:To provide the subject composition capable of giving coating films having antistatic effect at low humidities and excellent in transparency, hardness and friction resistance, useful for molded products, etc., comprising a specific silane compound mixture, heteropoly-acid (salt), organic solvent and acid-contg. water at specified proportion. CONSTITUTION:The objective composition comprising (A) a silane compound mixture composed of (1) a silane compound of formula I (R is 1-5C alkyl) and (2) a second silane compound of formula II, III or IV (R -R are each the same as R ; Y -Y are each organic group) at the molar ratio (l)/(2) of (80:20) to (20:80), (B) a heteropoly-acid (salt) such as phosphotungstic acid, (C) an organic solvent such as methanol, and (D) water containing 0.01-5wt.% of an acid such as hydrochloric acid, at the molar ratio A/B/C/D of 1:(0.001-0.15):(10-100):(1-30).

Crosslinked hybrid membranes based on sulfonated poly(ether ether ketone)/γ-methacryloxypropyltrimethoxysilane/phosphotungstic acid by an in situ sol–gel process for direct methanol fuel cells

Abstract: Proton exchange membranes with high dimensional stabilities and low water uptakes were constructed by incorporating phosphotungstic acid (PWA) into a cross-linked network composed of a crosslinkable sulfonated poly(ether ether ketone) containing dipropenyl groups (SDPEEK) and γ-methacryloxypropyltrimethoxysilane (KH570). The chemical structures of the hybrid membranes were confirmed by FT-IR spectroscopy and scanning electron microscopy (SEM). The results indicated that PWA particles were well dispersed in these membranes. The influences of the dispersed PWA on the properties of membranes such as thermal stability, water uptake, swelling ratio, proton conductivity, methanol permeability and mechanical property were researched. The addition of KH570-5/PWA in the hybrid membranes contributed to the improvement of the dimensional stabilities. And the hybrid membranes with 10–40wt% PWA showed higher proton conductivities than Nafion 117 at 80 °C, while the methanol permeabilities of these membranes were much lower than that of Nafion 117. The membranes also exhibited excellent mechanical properties. These results imply that the SDPEEK/KH570-5/PWA-x membranes are promising materials in the direct methanol fuel cells (DMFC) applications.

Hybrid Network Sulfonated Polynorbornene/Silica Membranes with Enhanced Proton Conductivity by Doped Phosphotungstic Acid

Abstract: A series of novel hybrid sulfonated polynorbornene-silica (PBN–SiO2) proton conducting membranes doped with different weight ratio of phosphotungstic acid (PWA) were prepared by the casting procedure. The proton conductivity of the composite membranes containing 40 wt.% PWA reached the maximum of 6.1 × 10–2 S cm–1 and increased gradually with PWA content and temperature elevating, while the methanol permeabilities (3.52–9.39 × 10–7 cm2 s–1) of these membranes were much lower than that of Nafion 117 (2.36 × 10–6 cm2 s–1). The membranes also exhibited excellent thermally stable and mechanical properties, which imply that the PBN–SiO2–PWA membranes are promising materials in the direct methanol fuel cells (DMFC) applications.

Electrochemical Grafting of Reduced Graphene Oxide with Polydiphenylamine Doped with Heteropolyanions and Its Optical Properties

Abstract: Electropolymerization of diphenylamine (DPA) onto a reduced graphene oxide (RGO) film was carried out to obtain a corresponding RGO/polydiphenylamie (PDPA) composite doped with phosphotungstic acid...