Bis-imidazolium functionalized self-crosslinking block polynorbornene anion exchange membrane

Feng, Zhang; He, Xiaohui; Cheng, Changwen; Huang, Shengmei; Duan, Yapeng; Zhu, Chuanyi; Guo, Yan; Wang, Kai; Chen, Defu

doi:10.1016/j.ijhydene.2020.03.046

Cited by 34 publications

(15 citation statements)

References 50 publications

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“…The open circuit voltages of fuel cell (approximately 0.97 V) were close to the theoretical OCV value at 60 • C (1.20 V) [46], indicating that the fuel crossover problem for this MEA was limited. However, the peak power densities for PSVBIm-30 and PSVBImn-50 were measured to be only 9.9 and 7.8 mW/cm 2 , which is much lower than the values reported recently for other AEMs containing imidazolium cations [47][48][49]. To confirm if the poor fuel cell performance was obtained under appropriate conditions or not during the MEA fabrication and the AEMFC operation, we carried out an additional fuel cell test for the MEA based on the commercially available FAA-3 (Fumatech) AEM that was fabricated using identical catalyst ink and following the same procedures.…”

Section: Fuel Cell Performancecontrasting

confidence: 73%

Anion Exchange Membranes Based on Imidazoline Quaternized Polystyrene Copolymers for Fuel Cell Applications

2021

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Imidazoline is a five-membered heterocycle derived by the partial reduction of one double bond of the imidazole ring. This work prepared new anion exchange membranes (AEMs) based on imidazoline quaternized polystyrene copolymers bearing N-b-hydroxyethyl oleyl imidazolinium pendent groups to evaluate the application potential for anion exchange membrane fuel cells (AEMFCs). For comparison, an imidazole quaternized polystyrene copolymer was also synthesized. The polymer chemical structure was confirmed by FTIR, NMR, and TGA. In addition, the essential properties of membranes, including ion exchange capacity (IEC), water uptake, and hydroxide conductivity, were measured. The alkaline stabilities of imidazolium-based and imidazolinium-based AEMs were compared by means of the changes in the TGA thermograms, FTIR spectra, and hydroxide conductivity during the alkaline treatment in 1 M KOH at 60 °C for 144 h. The results showed that the imidazolinium-based AEMs exhibited relatively lower hydroxide conductivity (5.77 mS/cm at 70 °C) but much better alkaline stability compared with the imidazolium-based AEM. The imidazolinium-based AEM (PSVBImn-50) retained 92% of its hydroxide conductivity after the alkaline treatment. Besides, the fuel cell performance of the imidazolium-based and imidazolinium-based AEMs was examined by single-cell tests.

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Section: Fuel Cell Performancecontrasting

confidence: 73%

Anion Exchange Membranes Based on Imidazoline Quaternized Polystyrene Copolymers for Fuel Cell Applications

2021

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“…As key components in all of these abovementioned applications, different kinds of alkaline anion exchange membranes (AAEMs) with rigid backbone structures, such as poly(aryl ether), poly(ether ether ketone), poly(arylene ether sulfone), polysulfone, polybenzimidazole, , polyethylene, , poly(vinylbenzyl chloride), poly(phenylene oxide), − poly(styrene- co -vinylbenzyl chloride), and fluorinated polymers, , have been reported in the literature in the past few years. A typical AAEM is composed of a polymer main chain with tethered cation ionic-exchange groups such as quaternary ammonium (QA), − imidazolium, − benzimidazolium, ,− pyridinium, ,, phosphonium, sulfonium, guanidinium, piperidinium, , pyrrolidinium, azepanium, morpholinium, and quinuclidium to facilitate the loading of free hydroxyl ions. The most reported AAEMs are based on QA cationic species pendant to a polymer main chain.…”

Section: Introductionmentioning

confidence: 99%

Cross-Linked Polybenzimidazoles as Alkaline Stable Anion Exchange Membranes

Sana

Das

Jana

2022

ACS Appl. Energy Mater.

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Despite the large volume of literature on alkaline anion exchange membranes (AAEMs), the development of efficient AAEMs with excellent alkaline stability and superior hydroxide conductivity is the major challenge. To mitigate this problem, cross-linked poly(butylated pyridinium benzimidazolium) iodide (CPBPBI) membranes were synthesized from pyridine-bridged polybenzimidazole (PyPBI) utilizing butyl iodide as the alkylating agent and 1,4-diiodobutane as a cross-linker. The AAEMs were fabricated by dipping the CPBPBI membranes in KOH to obtain CPBPBI-OH. Among the several structural variations, the CPBPBI-OBA-OH membrane displayed the highest hydroxide conductivities of 39.4 and 111 mS/cm at 30 and 80 °C, respectively. The ion exchange capacity (IEC) of CPBPBI-OH membranes was found to be altered in the range of 2.30–3.97 mequiv·g–1 at an ambient temperature depending on the polymer structure. The membranes studied in 5 M KOH solution at 80 °C for 16 days showed excellent chemical and dimensional stability. The IEC, Fourier transform infrared (FT-IR) and 1H nuclear magnetic resonance (NMR) spectra, and hydroxide ionic conductivity data of the AAEMs were compared before and after the chemical stability test, and all of these investigations proved that the membranes were highly stable in concentrated alkaline solution and almost zero or very negligible degradation was observed after harsh alkali treatment. The negligible loss of hydroxide ion conductivity of membranes even after 16 days in 5 M KOH treatment at 80 °C is attributed to the cross-linking formation that prevented the attack of OH– ions on C2 imidazolium moieties. Furthermore, the thermal and mechanical properties of the AAEMs showed excellent thermomechanical stability. Overall, the cross-linking of the PyPBI chains immensely helped in improving various physical properties, particularly hydroxide conductivity, alkaline stability, and mechanical robustness, which are important for the development of efficient AAEMs.

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“…The synthesized membrane also demonstrated alkaline stability because it could last for 480 hours at 80 C in 2 M aqueous NaOH with slight reduction in hydroxide conductivity. In Zhang et al's work, 145 a bis-imidazoliumfunctionalized IL was synthesized then used in selfcrosslinking AEMs. The presence of epoxy groups improved the mechanical properties of the membranes, had good morphology, and showed the existence of phase separation, which is advantageous to ionic channel formation and excellent ionic conductivity (24 Â 10 À3 and 95 Â 10 À3 S cm À1 at 30 and 80 C, respectively).…”

Section: Il In Anion Exchange Membranes (Aems)mentioning

confidence: 99%

Ionic liquid‐modified materials as polymer electrolyte membrane and electrocatalyst in fuel cell application: An update

Shaari

Ahmad

Bahru

et al. 2021

Intl J of Energy Research

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Ionic liquids (ILs) are promising solvents for catalytic and electrolyte applications, gas absorption, and extractions in electrochemical systems due to their useful features, such as high conductivity and good thermal, chemical, and electrical stability. This review focuses on incorporating ILs into fuel cell (FC) systems, specifically into two main components of FC (ie, polymer electrolyte membrane and electrocatalyst). In FC, a polymer electrolyte membrane with excellent conductivity and deprived of humidity even at high temperatures must be created for effective early commercialization of this technology.Electrocatalyst performance can also be enhanced with additive materials, such as ILs, thus further improving the entire achievement of FCs. This work discusses the most important reasons for ongoing studies and outlines the current progress in using ILs as a revolutionary form of polymer electrolyte membrane and electrocatalyst.

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Bis-imidazolium functionalized self-crosslinking block polynorbornene anion exchange membrane

Cited by 34 publications

References 50 publications

Anion Exchange Membranes Based on Imidazoline Quaternized Polystyrene Copolymers for Fuel Cell Applications

Anion Exchange Membranes Based on Imidazoline Quaternized Polystyrene Copolymers for Fuel Cell Applications

Cross-Linked Polybenzimidazoles as Alkaline Stable Anion Exchange Membranes

Ionic liquid‐modified materials as polymer electrolyte membrane and electrocatalyst in fuel cell application: An update

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