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].

scholarly journals Elucidation of the role of guanidinium incorporation in single-crystalline MAPbI3 perovskite on ion migration and activation energy

2020 ◽  
Vol 22 (20) ◽  
pp. 11467-11473 ◽  
Author(s):  
Apurba Mahapatra ◽  
Rashmi Runjhun ◽  
Jan Nawrocki ◽  
Janusz Lewiński ◽  
Abul Kalam ◽  
...  
Keyword(s):  
Activation Energy ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Temperature Dependent ◽  
Ion Migration ◽  
Single Crystalline

We have studied the effect of guanidinium incorporation in a single-crystalline MAPbI3 perovskite on ion migration using temperature-dependent electrochemical impedance spectroscopy.

scholarly journals The Effect of Graphite Addition on Thermal Conductivity, Microstructure, and Electrochemical Impedance Spectroscopy of AlN Ceramics

2021 ◽  
Author(s):  
Tun Wang ◽  
Jianjun Xie ◽  
Lei Zhang ◽  
Tao Lu ◽  
Maomao Ding ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Activation Energy ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Reduction Reaction ◽  
Oxygen Impurity ◽  
Carbon Reduction ◽  
Defects And Impurities ◽  
Multiphase Ceramics

Abstract Graphite/ aluminum nitride (AlN) multiphase ceramics are pressureless sintered under 1850°C using Dy2O3 and CaF2 as sintering additives. The effects of added graphite on microstructure, thermal conductivity, and electrochemical impedance spectroscopy of AlN ceramics were investigated. It was found that with 1wt% graphite addition the thermal conductivity of AlN in the through-plane to can achieve 210W/(m·K), which 25% higher than that of AlN without graphite. The graphite addition eliminates the oxygen impurity in AlN by a carbon reduction reaction in form of nanosized Dy2O3 particles. From electrochemical impedance spectroscopy manifested that the activation energy (Ea,g) of samples in grains is increased from 0.784 eV to 1.112 eV, suggesting that the concentrations of defects and impurities of Graphite/AlN multiphase ceramics are lower than those of monophase AlN ceramics.

scholarly journals Inhibition of aluminum corrosion in 0.1 M Na2CO3 by Ricinus communis oil

2017 ◽  
Vol 6 (4) ◽  
pp. 108-116 ◽  
Author(s):  
Imane Hamdou ◽  
Mohamed Essahli ◽  
Abdeslam Lamiri
Keyword(s):  
Activation Energy ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Potentiodynamic Polarization ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Ricinus Communis ◽  
Polarization Curves ◽  
Temperature Analysis ◽  
Aluminum Corrosion

The study was carried out using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) technique. The inhibition efficiency was found around 87 % with 1600 ppm of inhibitor. The efficiency was accentuated with the increase of the concentration while it decreased with the rise of the temperature. Analysis of the polarization curves revealed that the Ricinus communis oil is considered as a mixed inhibitor. The Influence of the temperature was also studied, the values of the activation energy showed that the inhibition occurred by physisorption. 

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.

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