scholarly journals Investigating the Proton and Ion Transfer Properties of Supported Ionic Liquid Membranes Prepared for Bioelectrochemical Applications Using Hydrophobic Imidazolium-Type Ionic Liquids

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 359
Author(s):  
László Koók ◽  
Piroska Lajtai-Szabó ◽  
Péter Bakonyi ◽  
Katalin Bélafi-Bakó ◽  
Nándor Nemestóthy
Keyword(s):  
Mass Transfer ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Microbial Fuel Cells ◽  
Transport Numbers ◽  
Liquid Membranes ◽  
Ion Transfer ◽  
Supported Ionic Liquid ◽  
Supported Ionic Liquid Membranes ◽  
Transfer Properties

Hydrophobic ionic liquids (IL) may offer a special electrolyte in the form of supported ionic liquid membranes (SILM) for microbial fuel cells (MFC) due to their advantageous mass transfer characteristics. In this work, the proton and ion transfer properties of SILMs made with IL containing imidazolium cation and [PF6]− and [NTf2]− anions were studied and compared to Nafion. It resulted that both ILs show better proton mass transfer and diffusion coefficient than Nafion. The data implied the presence of water microclusters permeating through [hmim][PF6]-SILM to assist the proton transfer. This mechanism could not be assumed in the case of [NTf2]− containing IL. Ion transport numbers of K+, Na+, and H+ showed that the IL with [PF6]− anion could be beneficial in terms of reducing ion transfer losses in MFCs. Moreover, the conductivity of [bmim][PF6]-SILM at low electrolyte concentration (such as in MFCs) was comparable to Nafion.

scholarly journals Novel Ionic Conducting Composite Membrane Based on Polymerizable Ionic Liquids

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3704
Author(s):  
Yaroslav L. Kobzar ◽  
Ghania Azzouz ◽  
Hashim Albadri ◽  
Jocelyne Levillain ◽  
Isabelle Dez ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Fuel Cell ◽  
Proton Conductivity ◽  
Liquid Membranes ◽  
Mechanical And Thermal Properties ◽  
Medium Temperature ◽  
Supported Ionic Liquid ◽  
Fuel Cell Application ◽  
Supported Ionic Liquid Membranes

In this work, the design and characterization of new supported ionic liquid membranes, as medium-temperature polymer electrolyte membranes for fuel-cell application, are described. These membranes were elaborated by the impregnation of porous polyimide Matrimid® with different synthesized protic ionic liquids containing polymerizable vinyl, allyl, or methacrylate groups. The ionic liquid polymerization was optimized in terms of the nature of the used (photo)initiator, its quantity, and reaction duration. The mechanical and thermal properties, as well as the proton conductivities of the supported ionic liquid membranes were analyzed in dynamic and static modes, as a function of the chemical structure of the protic ionic liquid. The obtained membranes were found to be flexible with Young’s modulus and elongation at break values were equal to 1371 MPa and 271%, respectively. Besides, these membranes exhibited high thermal stability with initial decomposition temperatures > 300 °C. In addition, the resulting supported membranes possessed good proton conductivity over a wide temperature range (from 30 to 150 °C). For example, the three-component Matrimid®/vinylimidazolium/polyvinylimidazolium trifluoromethane sulfonate membrane showed the highest proton conductivity—~5 × 10−2 mS/cm and ~0.1 mS/cm at 100 °C and 150 °C, respectively. This result makes the obtained membranes attractive for medium-temperature fuel-cell application.

scholarly journals Influence of Ionic Liquid Structure on Supported Ionic Liquid Membranes Effectiveness in Carbon Dioxide/Methane Separation

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Iwona Cichowska-Kopczyńska ◽  
Monika Joskowska ◽  
Bartosz Dębski ◽  
Justyna Łuczak ◽  
Robert Aranowski
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Polyvinylidene Fluoride ◽  
Mechanical Stability ◽  
Liquid Structure ◽  
Contact Angles ◽  
Liquid Membranes ◽  
Supported Ionic Liquid ◽  
Polypropylene Membrane ◽  
Supported Ionic Liquid Membranes

This paper indicates the possibility of application of imidazolium ionic liquids immobilized in polymeric supports—supported ionic liquid membranes—in CO2separation from gaseous streams (e.g., biogas). Imidazolium salts containing alkyl fluoride anions, bis(trifluoromethylsulfonyl)imide and trifluoromethanesulfonate, selectively separating CO2were used. The permeability of CO2through membranes was investigated under gas pressure of 30 kPa and temperature range 283–298 K. Permeability values occurred to be higher for ionic liquids containing bis(trifluoromethylsulfonyl)imide anion. Moreover, CO2permeability exhibited an increase with increasing temperature for all investigated systems. Stability of supported ionic liquid membranes was studied. In total, polypropylene membrane revealed the best properties, mechanical stability and observed wettability of this support were better than for polyamide and polyvinylidene fluoride ones. Polyethersulfone supports showed similar contact angles; however, its mechanical stability was significantly lower. Obtained results allowed to evaluate the effectiveness of separation process using selected ILs and supports.

scholarly journals Exploring the effect of fluorinated anions on the CO2/N2 separation of supported ionic liquid membranes

2017 ◽  
Vol 19 (42) ◽  
pp. 28876-28884 ◽  
Author(s):  
Andreia S. L. Gouveia ◽  
Liliana C. Tomé ◽  
Elena I. Lozinskaya ◽  
Alexander S. Shaplov ◽  
Yakov S. Vygodskii ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Liquid Membranes ◽  
Imidazolium Cation ◽  
Supported Ionic Liquid ◽  
Supported Ionic Liquid Membranes ◽  
Permeation Properties

The CO2 and N2 permeation properties of ionic liquids (ILs) based on a common imidazolium cation and different fluorinated anions were measured using supported ionic liquid membranes (SILMs).

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