A study of the stability of tungstophosphoric acid, H3PW12O40, using synchrotron XPS, XANES, hexane cracking, XRD, and IR spectroscopy

Enhancement of photocatalytic activity of nano-scale TiO2 particles co-doped by rare earth elements and heteropolyacids

“…S2b and are characteristic of high oxidation state tungstate environments. These divided spectra reveal a broad, doublet centered peak around 35.7 (4f 5/2 component) and 37.9 eV (4f 7/2 component), which is consistent with that in the pure parent H 3 PW 12 O 40 heteropoly acid [24,25] Fig. 6.…”

Chemical, electrical and electrochemical characterization of hybrid organic/inorganic polypyrrole/PW12O403− coating deposited on polyester fabrics

“…P2p analyses showed the presence of a band to P at 133.7 eV (figure not shown). This band has been observed in other studies of polyoxometalates [45][46][47][48].…”

Synthesis, characteristics and electrical properties of heteropoly compound Na2K3CuV(OH2)W11O39·16H2O permeated by Gd

“…These peaks can be assigned to ν as W Od 936 cm −1 , ν as W-Ob-W 884 cm −1 , ν as W-Oc-W 781 cm −1 and ν as Cu-Oa 415 cm −1 , respectively. This data indicates that compound anions have the Keggin skeleton structure [11,12]. that the terminal W Od characteristic peak of the original compound has disappeared.…”

“…XPS is a critical technique for the surface analysis, the constitution analysis and the structural analysis [12,13,[21][22][23][24]. Fig.…”