scholarly journals Caracterización Eléctrica de Membranas Poliméricas PVDF/ CF3COOLi

Respuestas ◽  
2015 ◽  
Vol 20 (1) ◽  
pp. 125 ◽  
Author(s):  
Rodrigo Andrés Vásquez-Bonilla ◽  
Nori Magali Jurado-Meneses ◽  
Miguel Iban Delgado-Rosero
Keyword(s):  
Ionic Conductivity ◽  
Impedance Spectroscopy ◽  
Polyvinylidene Fluoride ◽  
Room Temperature ◽  
Solution Method ◽  
Activation Energies ◽  
Pvdf Membrane ◽  
Conductive Membranes ◽  
Electrochemical Devices

Objetivo: Este documento estudia los efectos del trifluoroacetato de litio (CF3 COOLi) al usarse en una matriz de Polifluoruro de vinilideno (PVDF) para mejorar la conductividad iónica para usarse como electrolito para dispositivos electroquímicos. Metodología: Para esto se prepararon membranas en diferentes combinaciones por el método de solución. Las muestras se caracterizaron por espectroscopía de impedancias entre temperaturas de 298 K y 373 K con el fin de identificar el comportamiento de la conductividad de acuerdo a la concentración. Resultados: Los gráficos de conductividad dc en función del inverso de la temperatura, muestran un comportamiento Vogel-Tammann-Fulcher (VTF) con pseudo-energías de activación entre 7.30 × 10-3 y 5.05 × 10-4 eV. Conclusiones: La máxima conductividad obtenida fue de 3.85 ×10-4 S cm-1 a temperatura ambiente para altas concentraciones de CF3 COOLi, siendo este valor comparable con resultados obtenidos en otros estudios.AbstractObjective: This paper studies the effects of lithium trifluoroacetate (CF3 COOLi) when used in a Polyvinylidene fluoride (PVDF) membrane to improve its ionic conductivity for use as electrolyte for electrochemical devices. Method: CF3 COOLi/PVDF Ionic conductive membranes have been prepared by solution method. The samples were characterized by impedance spectroscopy (IS) with temperatures ranging from 298 K at 373 K. Results: The plots of conductivity with the inverse of temperature show an Vogel-Tamman-Fulcher (VTF) behavior, with pseudo activation energies between 7.30 × 10-3 y 5.05 × 10-4 eV. Conclusions: The higther conductivity (3.848 × 10-4 S cm-1) was obtain at room temperature to higth concentration of CF3 COOLi, this values is similarity with results from other documents.Palabras clave: Electrolito sólido, Membrana de compuesto CF3 COOLi/PVDF, Polímero iónicos electro-activos. 

Properties of New Superionic Compounds (NH4)6LiZr4-nHfnF23 (n=1, 3)

2018 ◽  
Vol 386 ◽  
pp. 305-308
Author(s):  
Anatoly Podgorbunsky ◽  
Tamara Antokhina ◽  
Sergey V. Gnedenkov
Keyword(s):  
Phase Transitions ◽  
Charge Transfer ◽  
Ionic Conductivity ◽  
Impedance Spectroscopy ◽  
Activation Energies ◽  
High Ionic Conductivity

The phase transitions and conductivity of novel compounds (NH4)6LiZr4-nHfnF23 (n = 1, 3) were studied by DSC and impedance spectroscopy. The structure and the activation energies of the charge transfer in these compounds were estimated. The high ionic conductivity of these fluorocomplexes reaches 10-2 S/cm at 453 K.

scholarly journals Electrical Conductivity and Nyquist Plot of C4C1Im BF4 at Room Temperature by Impedance Spectroscopy

2020 ◽  
Vol 3 (1) ◽  
pp. 119
Author(s):  
Pablo Vallet ◽  
Juan José Parajó ◽  
Félix Sotuela ◽  
Angel Morcillo ◽  
María Villanueva ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Electrical Conductivity ◽  
Ionic Liquids ◽  
Ionic Conductivity ◽  
Impedance Spectroscopy ◽  
Vapour Pressure ◽  
Room Temperature ◽  
Nyquist Plot ◽  
High Thermal Stability ◽  
Wide Potential

Ionic liquids (ILs) represent a real alternative for electrochemical applications due to their remarkable characteristics, namely a very low vapour pressure, low flammability, high thermal stability, wide potential window and high ionic conductivity. In this work, Nyquist plot and impedance spectroscopy at room temperature is proposed as an alternative method to obtain the ionic conductivity for ionic liquids by using an Agilent HP 4284A RLC precision meter. For this propose, the IL 1-butyl-3-methylimidazolium tetrafluoroborate (C4C1Im BF4) was selected and results were compared with the previously obtained from the conductimeter CRISON GLP31.

Effect of Intermolecular Interaction on Ionic Conductivity of CMC-DTAB Plasticized with Ec Based Solid Biopolymer Electrolyte

2021 ◽  
Vol 1025 ◽  
pp. 26-31
Author(s):  
Nurhasniza Mamajan Khan ◽  
Noor Saadiah Mohd Ali ◽  
Ahmad Salihin Samsudin
Keyword(s):  
Ionic Conductivity ◽  
Intermolecular Interaction ◽  
Room Temperature ◽  
Ethylene Carbonate ◽  
Ammonium Bromide ◽  
Ftir Analysis ◽  
Biopolymer Electrolytes ◽  
Electrochemical Devices ◽  
Biopolymer Electrolyte ◽  
Conduction Properties

The present work highlights on the structural and conduction properties of the solid biopolymer electrolytes (SBPE) based carboxymethyl cellulose (CMC) doped dodecyltrimethyl ammonium bromide (DTAB) and plasticized with ethylene carbonate (EC). The SBPE exhibits high ionic conductivity at room temperature where the highest value reaching 1.0 x 10-3 S cm-1 for sample containing with 10 wt. % of EC and increases the ionic conductivity when temperature was increased. Complexation within the SBPE has been confirmed by the FTIR analysis where the intermolecular interaction has improvised the coordination between CMC-DTAB and EC resulting in better structural and conductivity ability. The findings suggest that the great potential of CMC and make it promising to serve as an electrolyte for electrochemical devices.

Improved room temperature ionic conductivity of Ta and Ca doped Li7La3Zr2O12 via a modified solution method

2018 ◽  
Vol 314 ◽  
pp. 92-97 ◽  
Author(s):  
Xiaolan Chen ◽  
Tianxiang Cao ◽  
Mingzhe Xue ◽  
Hong Lv ◽  
Bing Li ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Room Temperature ◽  
Solution Method

Polymer Electrolyte of PVDF-HFP/PEMA-NH4CF3So3-TiO2 and its Application in Proton Batteries

2011 ◽  
Vol 287-290 ◽  
pp. 285-288
Author(s):  
Siti Rudhziah ◽  
Salmiah Ibrahim ◽  
Mohamed Nor Sabirin
Keyword(s):  
Impedance Spectroscopy ◽  
Titanium Oxide ◽  
Polymer Electrolytes ◽  
Polyvinylidene Fluoride ◽  
Room Temperature ◽  
Composite Polymer ◽  
Electrolyte System ◽  
Composite Polymer Electrolytes ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity

In this study, composite polymer electrolytes were prepared by addition of titanium oxide, TiO2nanofiller into polyvinylidene fluoride-co-hexafluoropropylene/polymethyl methacrylate-ammonium triflate (PVDF-HFP/PEMA-NH4CF3SO3) complex. The effect of TiO2on conductivity of the complex was examined using impedance spectroscopy. The highest room temperature conductivity of 1.32 × 10-3S cm-1was shown by the system containing 5 wt % of TiO2. This system was used for the fabrication of proton batteries with the configurations of (Zn + ZnSO4.7H2O + C + PTFE)/PVDF-HFP/PEMA-NH4CF3SO3-(5wt%)TiO2/(MnO2 + C + PTFE) and (Zn + ZnSO4.7H2O + C + PTFE)/PVDF-HFP/PEMA-NH4CF3SO3-(5wt%)TiO2/(MnO2 + PbO2+ C + PTFE). The performance of the batteries indicated potential application of the electrolyte system in proton batteries.

scholarly journals Synthesis and electrical properties of Ag16I12P2O7

2021 ◽  
Vol 340 ◽  
pp. 01046
Author(s):  
Artem Ulihin ◽  
Olga Protazanova
Keyword(s):  
Solid State ◽  
Ionic Conductivity ◽  
Electrical Properties ◽  
Impedance Spectroscopy ◽  
Solid Electrolyte ◽  
Wide Temperature Range ◽  
Room Temperature ◽  
Complex Impedance ◽  
High Ionic Conductivity ◽  
Spectroscopy Method

Superionic solid electrolyte Ag16I12P2O7 was prepared using solid state synthesis. The ionic conductivity of this compound was studied by the complex impedance spectroscopy method in a wide temperature range. It is shown that Ag16I12P2O7 is characterized by a high ionic conductivity at room temperature, comparable to the conductivity of liquid electrolytes.

Enhanced room temperature ionic conductivity of the LiBH4·1/2NH3–Al2O3 composite

2021 ◽  
Author(s):  
Ruixue Zhang ◽  
Wanying Zhao ◽  
Zhenzhen Liu ◽  
Shanghai Wei ◽  
Yigang Yan ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Room Temperature ◽  
Ion Conductivity ◽  
Al2o3 Composite

In situ formed amorphous LiBH4·1/2NH3 on the surface of Al2O3 nanoparticles results in an enhanced ion conductivity of 1.1 × 10−3 S cm−1 at room temperature.

scholarly journals Anion ordering enables fast H− conduction at low temperatures

2021 ◽  
Vol 7 (23) ◽  
pp. eabf7883
Author(s):  
Hiroki Ubukata ◽  
Fumitaka Takeiri ◽  
Kazuki Shitara ◽  
Cédric Tassel ◽  
Takashi Saito ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Room Temperature ◽  
Structural Transition ◽  
Hexagonal Lattice ◽  
Ionic Conductors ◽  
Activation Barriers ◽  
Energy Devices ◽  
Energy Applications ◽  
Chemical Disorder ◽  
New Energy

The introduction of chemical disorder by substitutional chemistry into ionic conductors is the most commonly used strategy to stabilize high-symmetric phases while maintaining ionic conductivity at lower temperatures. In recent years, hydride materials have received much attention owing to their potential for new energy applications, but there remains room for development in ionic conductivity below 300°C. Here, we show that layered anion-ordered Ba2−δH3−2δX (X = Cl, Br, and I) exhibit a remarkable conductivity, reaching 1 mS cm−1 at 200°C, with low activation barriers allowing H− conduction even at room temperature. In contrast to structurally related BaH2 (i.e., Ba2H4), the layered anion order in Ba2−δH3−2δX, along with Schottky defects, likely suppresses a structural transition, rather than the traditional chemical disorder, while retaining a highly symmetric hexagonal lattice. This discovery could open a new direction in electrochemical use of hydrogen in synthetic processes and energy devices.

Hydrocarbon degradation and separation of bilge water via a novel TiO2-HNTs/PVDF-based photocatalytic membrane reactor (PMR)

RSC Advances ◽  
2015 ◽  
Vol 5 (19) ◽  
pp. 14147-14155 ◽  
Author(s):  
A. Moslehyani ◽  
A. F. Ismail ◽  
M. H. D. Othman ◽  
T. Matsuura
Keyword(s):  
Titanium Dioxide ◽  
Polyvinylidene Fluoride ◽  
Membrane Reactor ◽  
Halloysite Nanotubes ◽  
Hydrocarbon Degradation ◽  
Pvdf Membrane ◽  
Bilge Water ◽  
Flat Sheet ◽  
Photocatalytic Membrane Reactor

This paper focuses on the potential of a novel flat sheet nanocomposite titanium dioxide (TiO2)-halloysite nanotubes (HNTs)/polyvinylidene fluoride (PVDF) membrane as a photocatalytic separator in the photocatalytic membrane reactor (PMR).

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