Pentadecatungstotrivanadodiphosphoric heteropoly acid with Dawson structure: Synthesis, conductivity and conductive mechanism

Highly proton-conducting hybrid materials ( P2W17V /PEG and P2W17V/PEG/SiO2 ) were prepared by heptadecatungstovanadodiphosphoric heteropoly acid with Dawson structure ( P2W17V , 90 wt.%), polyethylene glycol (PEG, 10 wt.% and 5 wt.%) and silica gel ( SiO2 , 0 wt.% and 5 wt.%). The products were characterized by the infrared (IR) spectrum, X-ray powder diffraction (XRD) analysis and electrochemical impedance spectrum (EIS). The result reveals that their conductivity values are 1.02 × 10-2 and 2.58 × 10-2S ⋅ cm-1 at room temperature (26°C) and 75% relative humidity (RH), respectively. Their conductivities increase with higher temperature and these activation energies of proton conduction are 9.51 and 14.95 kJ⋅mol-1, which are lower than that of pure heteropoly acid (32.23 kJ⋅mol-1). These mechanisms of proton conduction for these two materials are Grotthuss mechanism.

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Synthesis and conductive performance of quaternary heteropoly acid H5SiW9Mo2VO40⋅13H2O

Functional Materials Letters ◽

10.1142/s1793604718500650 ◽

2018 ◽

Vol 11 (04) ◽

pp. 1850065 ◽

Cited By ~ 2

Author(s):

Zhirong Xie ◽

Qingyin Wu ◽

Fengwei He ◽

Limei Ai

Keyword(s):

Activation Energy ◽

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Relative Humidity ◽

Proton Conductivity ◽

Heteropoly Acid ◽

Electrochemical Impedance ◽

Temperature Range ◽

Higher Temperature ◽

Conductive Mechanism

A novel molybdenum- and vanadium-substituted quaternary heteropoly acid H5SiW9Mo2VO40[Formula: see text][Formula: see text][Formula: see text]13H2O has been synthesized and characterized by IR, UV, TG-DTA and XRD. The proton conductive performance was studied by the electrochemical impedance spectroscopy (EIS), which demonstrated that H5SiW9Mo2VO40[Formula: see text][Formula: see text][Formula: see text]13H2O shows excellent proton conduction performance with proton conductivity reaching [Formula: see text][Formula: see text]S[Formula: see text]cm[Formula: see text] at 60∘C and 80% relative humidity. In the temperature range of measurements, conductivity enhances with higher temperature. The proton conductive mechanism of this new heteropoly acid is the vehicle mechanism due to the activation energy of 31.91[Formula: see text]kJ [Formula: see text] mol[Formula: see text].

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Synthesis and high proton conductive performance of vanadium-substituted Dawson structure heteropoly acid H8P2W16V2O62·20H2O

Materials Letters ◽

10.1016/j.matlet.2016.06.012 ◽

2016 ◽

Vol 181 ◽

pp. 1-3 ◽

Cited By ~ 8

Author(s):

Xuefei Wu ◽

Huaxue Cai ◽

Qingyin Wu ◽

Wenfu Yan

Keyword(s):

Heteropoly Acid ◽

High Proton ◽

Dawson Structure

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Synthesis and conductivity of heptadecatungstovanadodiphosphoric heteropoly acid with Dawson structure

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2011.04.148 ◽

2011 ◽

Vol 509 (29) ◽

pp. 7768-7772 ◽

Cited By ~ 31

Author(s):

Xia Tong ◽

Weiming Zhu ◽

Qingyin Wu ◽

Xueyu Qian ◽

Zhen Liu ◽

...

Keyword(s):

Heteropoly Acid ◽

Dawson Structure

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Synthesis and conductive performance about a kind of high-proton conductor, Dawson structure heteropoly acid H6P2W16Mo2O40 ⋅ 29H2O

Functional Materials Letters ◽

10.1142/s1793604721500193 ◽

2021 ◽

pp. 2150019

Author(s):

Xuefei Wu ◽

Qingyin Wu

Keyword(s):

Activation Energy ◽

Relative Humidity ◽

Heteropoly Acid ◽

Proton Conductor ◽

Conduction Activation Energy ◽

Measured Range ◽

High Proton ◽

Dawson Structure ◽

Higher Temperature ◽

Proton Migration

A heteropoly acid (HPA) with Dawson structure, H6P2W[Formula: see text]Mo2O[Formula: see text]⋅29H2O, is synthesized with characterization and the investigation toward its proton conductive behavior. Actually, at 18[Formula: see text]C with 80% relative humidity (RH), H6P2W[Formula: see text]Mo2O[Formula: see text] ⋅ 29H2O displays the conductivity as 2.30 × 10[Formula: see text] S ⋅ cm[Formula: see text], indicating an excellent protonic conductor. The proton conduction activation energy is 32.19 kJ ⋅ mol[Formula: see text], implying proton migration following vehicle mechanism. During the measured range, higher temperature can boost the conductivity.

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