Synthesis and conductivity of heptadecatungstovanadodiphosphoric heteropoly acid with Dawson structure

Tong, Xia; Zhu, Weiming; Wu, Qingyin; Qian, Xiao Qian; Liu, Zhen; Gong, Jian

doi:10.1016/j.jallcom.2011.04.148

Cited by 39 publications

(28 citation statements)

References 24 publications

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“…The well-defined straight line obtained from the Arrhenius plot suggests the presence of only one conduction mechanism in the temperature range of 289-373 K for the film. Thus, it is reasonable to represent the temperature dependence of DC for the film by the well-known expression [27][28][29],…”

Section: Ir Absorption Characteristics Of Scc Filmmentioning

confidence: 99%

Electrical conductivity, dielectric properties and optical absorption of organic based nanocrystalline sodium copper chlorophyllin for photodiode application

Farag

Mansour

Ammar

et al. 2012

Journal of Alloys and Compounds

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Section: Ir Absorption Characteristics Of Scc Filmmentioning

confidence: 99%

Electrical conductivity, dielectric properties and optical absorption of organic based nanocrystalline sodium copper chlorophyllin for photodiode application

Farag

Mansour

Ammar

et al. 2012

Journal of Alloys and Compounds

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“…6,7 Four hybrid materials were obtained using the following processes: HPA (5.4 g) was dissolved in 30 mL of boiling water, the polymer (PVP or PEG, 0.6 g) was added to the solution, and the mixture was stirred strongly until complete dissolution of the polymer. Then the mixture was vaporized at 50 • C to remove the solvent water.…”

Section: Methodsmentioning

confidence: 99%

Preparation and Conductivity of Organic-Tungstovanadophosphoric Acid Hybrid Materials

Tong

Zhou

et al. 2012

ECS Electrochemistry Letters

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Highly conducting hybrid materials were prepared from 90 wt% tungstovanadophosphoric heteropoly acids with Dawson structure (H 7 P 2 W 17 VO 62 or H 9 P 2 W 15 V 3 O 62 , abbreviated as P 2 W 17 V or P 2 W 15 V 3 ) and 10 wt% organic polymers (polyvinylpyrrolidone, PVP or polyethylene glycol, PEG). The result reveals that the conductivities of PVP/P 2 W 17 V, PEG/P 2 W 17 V, PVP/P 2 W 15 V 3 , and PEG/P 2 W 15 V 3 are 4.70 × 10 −3 , 1.02 × 10 −2 , 7.03 × 10 −3 , and 2.00 × 10 −2 S · cm −1 at 26 • C and 75% relative humidity, respectively. Their activation energies of proton conduction are 10. 72, 9.51, 14.87 and 13.79 kJ · mol −1 , which are lower than that of the pure heteropoly acids. The mechanism of proton conduction of hybrid materials are Grotthuss mechanisms.Heteropoly acids (HPAs) and their polyoxometalates (POMs) have attracted considerable attention because of fundamental interest and potential applications. 1 They can be used in fuel cells and supercapacitors due to their properties of fast charge transfer, high conductivity, and good thermal stability. 2 However, the strong influence of humidity on their proton conductivities, diffusional problems and continuous leakage during cell operation hinder their practical utilizations. To overcome these disadvantages, HPAs have been dispersed in organic polymer matrices or formed into some of their derivatives. 3 These hybrid materials have the possibility of becoming very useful, having both these advantages of organic materials such as light weight, flexibility, and good moldability and of inorganic materials such as high strength and conductivity, heat stability, and chemical resistance. It is interesting to note that these inorganic-organic materials, in which HPAs (or POMs) were well dispersed in the polymer matrices, have been found promising for electrochemical capacitors. 4 In recent years, studies on the conductivities of hybrid materials based on HPAs (or POMs) with Keggin structure and polymer matrices have been developed rapidly. 5 Some papers have reported that as a kind of proton conductors, the conductivities of hybrid materials are closely related to HPAs' (or POMs') structures in them. However, there are few reports about these hybrid materials prepared by HPAs (or POMs) with Dawson structure and organic polymers. The HPAs with Dawson structure process many protons and water molecules which are related to their conductivities and are benefit for proton conduction. In the present work, based on HPAs (H 7 P 2 W 17 VO 62 and H 9 P 2 W 15 V 3 O 62 , abbreviated as P 2 W 17 V or P 2 W 15 V 3 ) with Dawson structure which we have prepared, we report the preparation, conductivities and conduction mechanism of four hybrid materials containing tungstovanadophosphoric HPAs with Dawson structure and PVP or PEG. ExperimentalPreparation of hybrid materials.-H 7 P 2 W 17 VO 62 · nH 2 O and H 9 P 2 W 15 V 3 O 62 · nH 2 O were synthesized according to our previous papers. 6,7 Four hybrid materials were obtained using the following processes: HPA (5.4 g) was ...

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“…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.…”

Section: Introductionmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

Proton-conducting materials based on heteropoly acid and matrixes

Qian

2015

Journal of Non-Crystalline Solids

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Synthesis and conductivity of heptadecatungstovanadodiphosphoric heteropoly acid with Dawson structure

Cited by 39 publications

References 24 publications

Electrical conductivity, dielectric properties and optical absorption of organic based nanocrystalline sodium copper chlorophyllin for photodiode application

Electrical conductivity, dielectric properties and optical absorption of organic based nanocrystalline sodium copper chlorophyllin for photodiode application

Preparation and Conductivity of Organic-Tungstovanadophosphoric Acid Hybrid Materials

Proton-conducting materials based on heteropoly acid and matrixes

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