Synthesis and characterization of novel sulfonated polyimide with varying chemical structure for fuel cell applications

Liaqat, Khurram; Rehman, Wajid; Saeed, Shaukat; Waseem, Muhammad; Fazil, Srosh; Shakeel, Muhammad; Kang, Peng

doi:10.1016/j.ssi.2018.02.018

Cited by 16 publications

(10 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the long-chain AL-SPI-10 became a bit fragile after the test. Furthermore, shorter-chain AL-SPI-5exhibited better IEC and water uptake than the long-chain counterpart, while its proton conductivity was higher than that ofNafion 115 at 80 • C. K. Liaqat et al [47] characterized a novel sulfonated polyimide (NSPI) with a unique structure inwhich the -SO 3 H groups wereattached to a phenylene side chain rather than the main chain, via the copolymerization of novel sulfonated diamine (NSDA) with 4,4'-oxydianiline (ODA) and 4,4'-oxydiphthalic anhydride (ODPA). The relocation of -SO 3 H groups to the side chain was suggested to improve the hydrolytic stability of NSPI under the test at 140 • C with pressurized steam, by lowering the risk of the nucleophilic attack of hydroxyl ions on the imide rings.…”

Section: Improvements To Spi Pemsmentioning

confidence: 99%

Recent Progress in the Development of Aromatic Polymer-Based Proton Exchange Membranes for Fuel Cell Applications

et al. 2020

View full text Add to dashboard Cite

Proton exchange membranes (PEMs) play a pivotal role in fuel cells; conducting protons from the anode to the cathode within the cell’s membrane electrode assembles (MEA) separates the reactant fuels and prevents electrons from passing through. High proton conductivity is the most important characteristic of the PEM, as this contributes to the performance and efficiency of the fuel cell. However, it is also important to take into account the membrane’s durability to ensure that it canmaintain itsperformance under the actual fuel cell’s operating conditions and serve a long lifetime. The current state-of-the-art Nafion membranes are limited due to their high cost, loss of conductivity at elevated temperatures due to dehydration, and fuel crossover. Alternatives to Nafion have become a well-researched topic in recent years. Aromatic-based membranes where the polymer chains are linked together by aromatic rings, alongside varying numbers of ether, ketone, or sulfone functionalities, imide, or benzimidazoles in their structures, are one of the alternatives that show great potential as PEMs due totheir electrochemical, mechanical, and thermal strengths. Membranes based on these polymers, such as poly(aryl ether ketones) (PAEKs) and polyimides (PIs), however, lack a sufficient level of proton conductivity and durability to be practical for use in fuel cells. Therefore, membrane modifications are necessary to overcome their drawbacks. This paper reviews the challenges associated with different types of aromatic-based PEMs, plus the recent approaches that have been adopted to enhance their properties and performance.

show abstract

Section: Improvements To Spi Pemsmentioning

confidence: 99%

Recent Progress in the Development of Aromatic Polymer-Based Proton Exchange Membranes for Fuel Cell Applications

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Purple crystals formed were filtered and washed for the removal of traces of reactants. The recrystallization of crude materials was carried out in ethanol [18]. The synthesis of the NSDA is illustrated in Figure 1.…”

Section: Synthesis Of Novel Sulfonated Diamine (Nsda)mentioning

confidence: 99%

“…Keeping the above points in mind, this paper reports the synthesis of a novel diamine with a sulfonic acid group on the ring other than the amino group [18]. This inclusion is expected to enhance the hydrolytic stability by diminishing the electrophilicity of the carbonyl from the imide ring [19,20].…”

Section: Introductionmentioning

confidence: 99%

Sulfonated Polyimide Membranes Derived from a Novel Sulfonated Diamine with Pendant Benzenesulfonic Acid for Fuel Cells

Liaqat¹,

Fazil²,

Rehman

et al. 2021

Energies

Self Cite

View full text Add to dashboard Cite

For improving the hydrolytic stability of sulfonated polyimides consisting of five membered anhydrides, novel sulfonated polyimides (NSPIs) were prepared via polymerization of 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA), with a novel diamine monomer with a pendant sulfonic acid group and 4,4-oxydianiline. Water uptake of this NSPI with an excellent film-forming ability was almost equal to that of Nafion® 117, while their ion exchange capacity (IEC) was 22% higher than Nafion® 117. The loss in weight decreased by 53% and loss in IEC decreased by 66% compared to that of Nafion® 117; both were used to quantitatively measure hydrolytic stability, and radical oxidative stability also increased by 75% when compared with Nafion® 117. Mechanically, this NSPI was superior, and its proton conductivity was higher than Nafion® 117 at elevated temperatures. All these improvements were due to the introduction of this pendant group. Taken together, we herein report a promising renewable energy source based on SPIs capable of displaying proton conductivity and enhanced hydrophilicity.

show abstract

“…Thereby, the development of more affordable PEMs based on hydrocarbon structures of sulfonated aromatic polymers may involve incentive and cost‐effective opportunities in this field. Numerous examples of potential membrane materials functionalized with sulfonic groups have been proposed and can be found in the recent related bibliography such as poly(ether‐ether ketones), 4–7 poly(vinyl alcohol), 8–12 polyimides, 13–16 poly(benzimidazoles), 17–20 poly(phosphazenes) 21–23 or polystyrene‐block copolymers 24–27 …”

Section: Introductionmentioning

confidence: 99%

Triblock SEBS/DVB crosslinked and sulfonated membranes: Fuel cell performance and conductivity

Teruel-Juanes

Río

Cháfer

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

A set of styrene‐ethylene‐butylene‐styrene triblock copolymer (SEBS) membranes with 10 or 25 wt% divinyl‐benzene (DVB) as a crosslinking agent were prepared and validated. Physicochemical characterization revealed suitable hydrolytic and thermal stability of photo‐crosslinked membranes containing 25 wt% DVB and post‐sulfonated. These compositions were evaluated in H2/O2 single cells, and electrical and proton conductivities were furtherly assessed. The membranes with the milder post‐sulfonation showed greater proton conductivity than those with excessive sulfonation. In terms of electrical conductivity, a universal power law was applied, and the values obtained were low enough for being used as polyelectrolytes. At the analyzed temperatures, the charge transport process follows a long‐range pathway or vehicular model. Finally, fuel cell performance revealed the best behavior for the membrane with 25 wt% DVB, photo‐crosslinked during 30 min and mild sulfonated, with a promising power density of 526 mW·cm−2. Overall, the results obtained highlight the promising fuel cell performance of these cost‐effective triblock copolymer‐based membranes and indicate that higher sulfonation does not necessarily imply better power density.

show abstract

Synthesis and characterization of novel sulfonated polyimide with varying chemical structure for fuel cell applications

Cited by 16 publications

References 28 publications

Recent Progress in the Development of Aromatic Polymer-Based Proton Exchange Membranes for Fuel Cell Applications

Recent Progress in the Development of Aromatic Polymer-Based Proton Exchange Membranes for Fuel Cell Applications

Sulfonated Polyimide Membranes Derived from a Novel Sulfonated Diamine with Pendant Benzenesulfonic Acid for Fuel Cells

Triblock SEBS/DVB crosslinked and sulfonated membranes: Fuel cell performance and conductivity

Contact Info

Product

Resources

About