Synthesis and electrochemical properties of substituted heteropoly acid with Dawson structure H7[In(H2O)P2W17O61]·23H2O

Abstract

A new solid high-proton conductor, substituted heteropoly acid with Dawson structure H(7)[In(H(2)O)P(2)W(17)O(61)]·23H(2)O, has been synthesized by the degradation/ion exchange/freezing method. The pH of the synthesis reaction was given. The product was characterized by chemical analysis, IR, UV, XRD and TG-DTA. The determination of conductivity shows that H(7)[In(H(2)O)P(2)W(17)O(61)]·23H(2)O is an excellent solid high-proton conductor with conductivity of 1.34 × 10(-3) S cm(-1) at 18 °C, and 70% relative humidity (RH). Its activation energy is 37.72 kJ mol(-1), which suggests that its mechanism of proton conduction is the Vehicle mechanism.

A magnetically-separable H 3 PW 12 O 40 @Fe 3 O 4 /EN-MIL-101 catalyst for the one-pot solventless synthesis of 2H-indazolo[2,1- b ] phthalazine-triones

“…Characteristic charge-transfer bands were observed in the spectrum of phosphotungstic acid at 213 and 266 nm (Fig. S3b): that around 213 nm is assigned to Ot→W LMCT (ligand-to-metal-charge-transfer) and that around 266 nm is assigned to Ob1, b2→W LMCT band [52,53]. The other bands around 1168, 1103, 883 and 748 cm -1 can be attributed to C-H deformations [55].…”

Preparation and Electrochemical Performance of Hybrid Materials Containing Heteropoly Acid With Dawson Structure and Polymers

“…Although the introduction of matrices, these characteristic diffraction peaks of the crystals of P 2 W 17 V are still observed in curves b and c. The sharp diffraction band at about 6 ○ À10 ○ is characteristic of Dawson structure, indicating the existence of Dawson anions in the hybrid materials, and are in accordance with the IR spectra data. 13 The broad diffraction peaks at 15 ○ À38 ○ were observed for P 2 W 17 V/PEG and P 2 W 17 V/PEG/SiO 2 , suggesting that these hybrid materials are considered amorphous without long range order. 14 The conductivity is measured as a fundamental property of the hybrid material.…”

Proton-conducting materials based on heteropoly acid and matrixes

“…Herein, we report the preparation, conductivity and conduction mechanism of these hybrid materials based on Dawson-type heptadecatungstodiphosphoindic heteropoly acid (H 7 W 17 In) was synthesized according to our previous paper [8]. P 2 W 17 In/PVP and P 2 W 17 In/PVP/SiO 2 were obtained using the following procedures: P 2 W 17 In (5.4 g) and PVP (0.6 g and 0.3 g) were dissolved in 100 mL of water, respectively.…”

“…In particular, as well-known solid acids, HPAs show good proton conductivities due to their strong acidity [6][7][8], which makes them applicable in some particular areas such as fuel cells and supercapacitors [9,10], which will provide insights in developing electrochemical electrolytes based on POM [11]. However, some HPAs or POMs are not stable under normal conditions.…”