Anion-conducting sulfaminated aromatic polymers by acid functionalization

Pasquini, Luca; Knauth, Philippe; Pelzer, Katrin; Vona, Maria Luisa Di

doi:10.1039/c5ra03583j

Cited by 9 publications

(15 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The protonation of the sulfonamide group leads to a sulfammonium group, which is stable also in absence of excess acid, as shown previously 33 . Furthermore, a small degree of cross-linking (DXL = 0.1) is introduced by the sulfonation procedure with chlorosulfonic acid 33 , as shown by the NMR spectrum ( Figure 7).…”

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

confidence: 49%

“…Furthermore, a small degree of cross-linking (DXL = 0.1) is introduced by the sulfonation procedure with chlorosulfonic acid 33 , as shown by the NMR spectrum ( Figure 7). Evidently, this structure leads to a very efficient reduction of cation permeation by the Donnan exclusion and the permeability values are very low (Table 1).…”

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

confidence: 99%

“…Before the measurements, the membranes were immersed 24 h at 25 °C into 1 M solution of NaHSO4 and thoroughly washed several times in deionized water. 33 .…”

Section: Psu-dabco (14-diazabicyclo[222]octane)mentioning

confidence: 99%

See 2 more Smart Citations

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

2017

Self Cite

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

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

confidence: 49%

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

confidence: 99%

See 1 more Smart Citation

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

2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…A classical synthetic route involves chloromethylation, followed by substitution with tertiary amines . Another possibility is the grafting of sulfonamide groups followed by reaction with mineral acids …”

Section: Introductionmentioning

confidence: 99%

“…The synthesis strategy was to functionalize the polymer with a moiety that can, in a second step, be transformed into acidic (sulfonic acid) as well as into basic (sulfonamide) groups. The intermediate chosen for this purpose was a chlorosulfonated moiety . The acid–base dependence of mobile ions is represented in Figure , which shows PEEK containing both sulfonic acid and sulfonamide groups (hereafter referred to as “SAM‐PEEK”).…”

Section: Introductionmentioning

confidence: 99%

Low‐Permeability Poly(ether Ether Ketone)‐Based Ampholytic Membranes

et al. 2016

View full text Add to dashboard Cite

Ion-exchange membranes based on sulfonated and sulfaminated poly(ether ether ketone) were prepared by a modified sulfamination route. In a first step, poly(ether ether ketone) was sulfonated. The sulfonic acid groups were then transformed into chlorosulfonic moieties by reaction with thionyl chloride. A proportion of the chlorosulfonic functionalities reacted with dimethylamine to give basic sulfonamide groups, whereas those remaining were hydrolyzed back to sulfonate moieties obtaining, after immersion in acidic solution, an ampholytic polymer. The thermal, mechanical, electrical, and permeability properties of these amphoteric membranes were characterized. These membranes exhibit good thermal and mechanical stability and ultra-low vanadium ion permeability. The type and value of ion conductivity can be adjusted by the choice of acidic or basic medium. The tunable ion conductivity and the low ion permeability are suitable characteristics for the development of high-performance separator membranes

show abstract

Mn₃O₄ Nanoparticle‐Decorated Carbon Cloths with Superior Catalytic Activity for the V^II/V^III Redox Reaction in Vanadium Redox Flow Batteries

et al. 2018

View full text Add to dashboard Cite

Mn3O4 nanoparticle‐decorated carbon cloths are prepared as the electrodes for vanadium redox flow batteries. The Mn3O4 nanoparticles are prepared using a two‐step process, in which MnOOH nanoflakes are electrodeposited on the surface of the carbon cloth and subsequently converted to Mn3O4 nanoparticles by a thermal treatment. The prepared electrode exhibits a superior electrocatalytic activity toward the VII/VIII redox reaction. It is demonstrated that the peak potential separation of the VII/VIII redox reaction on the as‐prepared electrode is reduced from 402.0 mV to 82.4 mV at a scan rate of 5 mV s−1 when the pristine carbon cloth is deposited with Mn3O4 nanoparticles. The flow battery with carbon cloths decorated with 0.31 mg cm−2 of Mn3O4 nanoparticles as the electrode exhibits an energy efficiency of 88 %, which is 17 % higher than that of the battery assembled with the pristine carbon cloth at a current density of 100 mA cm−2. Therefore, the superior electrocatalytic activity of Mn3O4 nanoparticles reported offers a promising approach to improve the performance of carbon‐based electrodes, which can reduce the capital cost of vanadium redox flow batteries.

show abstract

Anion-conducting sulfaminated aromatic polymers by acid functionalization

Cited by 9 publications

References 55 publications

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

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

Low‐Permeability Poly(ether Ether Ketone)‐Based Ampholytic Membranes

Mn₃O₄ Nanoparticle‐Decorated Carbon Cloths with Superior Catalytic Activity for the V^II/V^III Redox Reaction in Vanadium Redox Flow Batteries

Contact Info

Product

Resources

About

Anion-conducting sulfaminated aromatic polymers by acid functionalization

Cited by 9 publications

References 55 publications

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

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

Low‐Permeability Poly(ether Ether Ketone)‐Based Ampholytic Membranes

Mn3O4 Nanoparticle‐Decorated Carbon Cloths with Superior Catalytic Activity for the VII/VIII Redox Reaction in Vanadium Redox Flow Batteries

Contact Info

Product

Resources

About

Mn₃O₄ Nanoparticle‐Decorated Carbon Cloths with Superior Catalytic Activity for the V^II/V^III Redox Reaction in Vanadium Redox Flow Batteries