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

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.

Synthesis and conduction mechanism of high proton conductor H6SiW10V2O40⋅14H2O

2016 ◽  
Vol 09 (03) ◽  
pp. 1650048 ◽  
Author(s):  
Huaxue Cai ◽  
Tianpei Huang ◽  
Qingyin Wu ◽  
Wenfu Yan
Keyword(s):  
Activation Energy ◽  
Relative Humidity ◽  
Conduction Mechanism ◽  
Heteropoly Acid ◽  
Proton Conductor ◽  
Proton Conduction ◽  
Arrhenius Behavior ◽  
High Proton Conductivity ◽  
High Proton ◽  
Higher Temperature

A ternary heteropoly acid (HPA) H6SiW[Formula: see text]V2O[Formula: see text]14H2O was prepared and investigated in this paper. The structure feature and hydration of this HPA was characterized by IR, XRD, UV, and TG-DTA. This HPA exhibits a high proton conductivity, which is [Formula: see text]S[Formula: see text]cm[Formula: see text] at 25[Formula: see text]C and 70% relative humidity. It is a novel high proton conductor. The conductivity increases with higher temperature, and it exhibits Arrhenius behavior, with the activation energy value of 21.02[Formula: see text]kJ[Formula: see text] mol[Formula: see text] for proton conduction, indicating the proton conduction mechanism is dominated by vehicle mechanism.

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

2018 ◽  
Vol 11 (04) ◽  
pp. 1850065 ◽  
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].

Solid high-proton conductor tungstovanadozincic acid with transition metal as central atom: Synthesis and conductivity

2015 ◽  
Vol 08 (04) ◽  
pp. 1550041 ◽  
Author(s):  
Tianpei Huang ◽  
Xuefei Wu ◽  
Qingyin Wu ◽  
Fahe Cao ◽  
Wenfu Yan
Keyword(s):  
Activation Energy ◽  
Transition Metal ◽  
Heteropoly Acid ◽  
Electrochemical Impedance ◽  
Central Atom ◽  
Proton Conductor ◽  
Impedance Spectrum ◽  
Electrochemical Impedance Spectrum ◽  
High Proton ◽  
C 50

A Keggin-type vanadium-substituted tungstovanadozincic heteropoly acid H 7 ZnW 11 VO 40 ⋅ 8 H 2 O , with the transition metal as central atom, was firstly synthesized and characterized. Its proton conductivity was measured by the electrochemical impedance spectrum (EIS), and the result indicates that the H 7 ZnW 11 VO 40 ⋅ 8 H 2 O is a solid high-proton conductor with conductivity of 3.26 × 10-3S ⋅ cm-1 at 58°C, 50% relative humidity. Its activation energy is 29.50 kJ ⋅ mol-1, which suggests that the mechanism of proton conduction is the Vehicle mechanism.

PREPARATION AND ELECTROCHEMICAL PERFORMANCE OF HYBRID MATERIALS CONTAINING HETEROPOLY ACID WITH DAWSON STRUCTURE AND POLYMERS

2012 ◽  
Vol 05 (04) ◽  
pp. 1250040 ◽  
Author(s):  
XIA TONG ◽  
WEN WU ◽  
SHENGMING ZHOU ◽  
QINGYIN WU ◽  
FAHE CAO ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Heteropoly Acid ◽  
Electrochemical Impedance ◽  
Impedance Spectrum ◽  
Xrd Analysis ◽  
Proton Conduction ◽  
Electrochemical Impedance Spectrum ◽  
Grotthuss Mechanism ◽  
Dawson Structure ◽  
Higher Temperature

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.

Synthesis and performance of high-proton conductor undecatungstochromoindic heteropoly acid

2005 ◽  
Vol 59 (1) ◽  
pp. 123-126 ◽  
Author(s):  
Qingyin Wu ◽  
Xiaoguang Sang ◽  
Bin Liu ◽  
V.G. Ponomareva
Keyword(s):  
Heteropoly Acid ◽  
Proton Conductor ◽  
High Proton ◽  
And Performance

Synthesis and high proton conductive performance of indium-substituted Keggin-type quaternary heteropoly acid

2021 ◽  
Author(s):  
Xuefei Wu ◽  
Qingyin Wu
Keyword(s):  
Relative Humidity ◽  
Heteropoly Acid ◽  
Keggin Structure ◽  
Synthesis And Characterization ◽  
Protonic Conductivity ◽  
Keggin Type ◽  
High Proton

The synthesis and characterization of indium-substituted Keggin structure quaternary heteropoly acid, H4[In(H2O)PW9Mo2O39]·11H2O (PMo9W2In), is reported. At 18 °C with 80% relative humidity, PMo9W2In displays the protonic conductivity as 2.32 ×10-4...

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