Fluoride‐ion‐conducting Polymers: Ionic Conductivity and Fluoride Ion Diffusion Coefficient in Quaternized Polysulfones

Pasquini, Luca; Ziarelli, Fabio; Viel, Stéphane; Vona, Maria Luisa Di; Knauth, Philippe

doi:10.1002/cphc.201500643

Cited by 13 publications

(12 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[56][57] According to Scheme 1a, chloromethylated polysulfone (PSU-CH 2 Cl, CM-PSU) was synthesized starting from PSU (3.78 g, 8.55 meq) dissolved in chloroform at RT under nitrogen, using paraformaldehyde (2.57 g, 85.5 meq), trimethylchlorosilane (10.8 mL, 85.5 meq), and SnCl 4 (0.2 mL in 20 mL chloroform). [56][57] According to Scheme 1a, chloromethylated polysulfone (PSU-CH 2 Cl, CM-PSU) was synthesized starting from PSU (3.78 g, 8.55 meq) dissolved in chloroform at RT under nitrogen, using paraformaldehyde (2.57 g, 85.5 meq), trimethylchlorosilane (10.8 mL, 85.5 meq), and SnCl 4 (0.2 mL in 20 mL chloroform).…”

Section: Psu-dabcomentioning

confidence: 99%

Layered Double Hydroxides Containing an Ionic Liquid: Ionic Conductivity and Use in Composite Anion Exchange Membranes

et al. 2018

Self Cite

View full text Add to dashboard Cite

Zinc-aluminum layered double hydroxide (LDH) containing an ionic liquid, 1-butyl-3-methylimidazolium hydrogen sulfate (BmimSO 4 ), has been synthesized by a co-precipitation method. This strategy enabled the intercalation of the ionic liquid (IL) into the interlamellar space of LDH with the aim of increasing the ionic conductivity and reducing its dependence on water content. Pure and IL-intercalated LDHs have been characterized by Fourier-Transform Infrared (FTIR) spectroscopy and X-ray diffraction. Electrochemical Impedance Spectroscopy (EIS) measurements showed that the addition of IL enhanced the ionic conductivity of LDH by a factor of 15 at low humidity and by a factor of 9 at high humidity conditions. As a possible application, LDHs were dispersed as a guest filler in a composite anion exchange membrane (AEM) based on polysulfone-DABCO. In this case, the addition of IL remarkably improved the ionic conductivity of the membrane from 1.0 · 10 À9 to 2.4 · 10 À7 S/ cm at low humidity. At high humidity, the membranes reached a conductivity of 25 mS/cm at 25 8C in OH form. Stability tests of composite AEM confirmed the positive effect of LDH nanoparticles. Figure 1. Chemical formulas of a) LDH and b) 1-Butyl-3-methylimidazolium hydrogen sulfate (BmimSO 4 ).

show abstract

Section: Psu-dabcomentioning

confidence: 99%

Layered Double Hydroxides Containing an Ionic Liquid: Ionic Conductivity and Use in Composite Anion Exchange Membranes

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…for PSU-TMA than for PSU-DABCO (0.18) 51 , which was attributed to the larger size of bulky DABCO that increases porosity. This factor should enhance the cation permeability in PSU-DABCO in agreement with the data.…”

Section: Anion-conducting Membranes: Psu-qa and Sa-peekmentioning

confidence: 93%

“…In a previous work, the fluoride ion diffusion coefficient in PSU-TMA and PSU-DABCO was measured by NMR spectroscopy 51 . The diffusion coefficient can be used to estimate the ratio porosity ε/tortuosity τ 52 of the membrane by the following scaling equation:…”

Section: Anion-conducting Membranes: Psu-qa and Sa-peekmentioning

confidence: 99%

Comparative study of the cation permeability of protonic, anionic and ampholytic membranes

2017

View full text Add to dashboard Cite

The vanadium ion permeability of various ion-conducting polymer membranes was determined using a home-made apparatus. The study includes proton-conducting sulfonated poly(ether ether ketone) (SPEEK) with various cross-linking degrees, anion-conducting membranes, such as polysulfone with quaternary ammonium groups (PSU-QA) and sulfaminated PEEK (SA-PEEK), and amphoteric membranes based on PEEK containing both sulfonic and sulfonamide groups (SAM-PEEK) that can conduct both cations and anions. The polymer structure was investigated by NMR spectroscopy. The permeability of SPEEK decreases with the cross-linking degree and can be up to two orders below the permeability of a Nafion 117 reference membrane (1.4 10 -6 cm 2 /min). The cation permeability of SA-PEEK attains values as low as 5.0 10 -10 cm 2 /min, whereas amphoteric SAM-PEEK has a cation permeability of 7.0 10 -10 cm 2 /min. A factor or merit is introduced, defined as the ratio of ion conductivity and ion permeability ; the highest value, corresponding to the best compromise of high ion conductivity and low permeability of electrochemically active ions, is found for highly cross-linked SPEEK, SA-PEEK and SAM-PEEK membranes. The influence of the polymer backbone (PEEK or PSU), the degree of cross-linking, determined by NMR spectroscopy, and the grafted ionic groups (sulfonic acid, sulfammonium, and quaternary ammonium) on the cation permeability is discussed.

show abstract

“…Jian et al prepared the quaternized PPEKK membranes with trimethylamine (TMA) and pyridinium groups (Py) as functional side chains. [102] The mechanical stability of membrane depends on the structure of polymer backbone. The slightly higher basicity of pyridinium groups promoted the ion interaction with the acidic solution, which leads to the more distinct phaseseparation structure but the smaller ions channels and hence suppresses the vanadium ions permeation.…”

Section: Wwwadvsustainsyscommentioning

confidence: 99%

“…Moreover, the bulky DABCO groups may increase the porosity. [102] The mechanical stability of membrane depends on the structure of polymer backbone. To avoid the degradation of backbone, the quaternized DAPP membranes with fully aromatic structure was synthesized for VRFBs.…”

Section: Wwwadvsustainsyscommentioning

confidence: 99%

The Structure–Activity Relationship in Membranes for Vanadium Redox Flow Batteries

Jiang

Xiang

et al. 2019

Advanced Sustainable Systems

View full text Add to dashboard Cite

IntroductionWith the rapid increase of consumption of fossil fuels and the consequent environment pollution, there is an urgent need for the development and effective utilization of renewable energy sources like wind, solar, biomass, etc. However, these renewable energy sources are intermittent in nature, leading to the conflict between the seasonal and unstable electricity generation and requirement of the continuous and stable power supply for the end application. Thereby, energy storage Vanadium redox flow batteries (VRFBs) are regarded as one of the most promising electrochemical technologies for grid-connected renewable energy storage systems. The performance of VRFBs, however, strongly depends on the membrane, one of the key components of VRFBs with critical dual functions of promotion of diffusion of active species (H + , H 3 O + , SO 4 2−, or SO 4 H − ) and inhibition of crossover of vanadium ions. This is intrinsically related to the microstructure of membranes. For example, large and connected ionic clusters or pores in membranes are favorable for the ion transfer, but detrimental to the ion selectivity. While small and isolated hydrophilic ion clusters or pores suppress the water uptake and ion transfer, the decreased swelling ratio would enhance chemical stability of membrane. Thus, comprehensive strategies are required to realize the optimal balance between the ion selectivity, proton conductivity, and chemical stability. This review focuses on the effects of microstructure of membranes on the ion transfer and the chemical stability, including introduction of the rigid groups, electron-withdrawing groups, and hydrophobic backbones, are reviewed. The prospect of the development of membranes with high ion selectivity and high-performance VRFBs is discussed.

show abstract

Fluoride‐ion‐conducting Polymers: Ionic Conductivity and Fluoride Ion Diffusion Coefficient in Quaternized Polysulfones

Cited by 13 publications

References 34 publications

Layered Double Hydroxides Containing an Ionic Liquid: Ionic Conductivity and Use in Composite Anion Exchange Membranes

Layered Double Hydroxides Containing an Ionic Liquid: Ionic Conductivity and Use in Composite Anion Exchange Membranes

Comparative study of the cation permeability of protonic, anionic and ampholytic membranes

The Structure–Activity Relationship in Membranes for Vanadium Redox Flow Batteries

Contact Info

Product

Resources

About