Multifunctional poly(ionic liquid)s cross-linked polybenzimidazole membrane with excellent long-term stability for high temperature-proton exchange membranes fuel cells

Li, Fengxiang; Wang, Shuang; Wang, Di; Li, Geng; Cui, Yinghe; Liang, Deqing; Wang, Xiaodong; Yong, Zhipeng; Wang, Zhe

doi:10.1016/j.jpowsour.2021.229732

Cited by 74 publications

(47 citation statements)

References 61 publications

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“…The voltage degradation rate is significantly slow, only 0.106 mV h –1 during 500 h continuous discharge, indicating that the 10P 20S membrane has outstanding chemical stability and PA retention (Figure b). In comparison with other work, the membranes have much longer long-term stability and smaller voltage drop. ,, …”

Section: Resultsmentioning

confidence: 72%

“…In comparison with other work, the membranes have much longer long-term stability and smaller voltage drop. 13,34,55 4. CONCLUSIONS…”

Section: Results Andmentioning

confidence: 99%

“…Compared with low-temperature PEMFCs (LT-PEMFCs), high-temperature PEMFCs (HT-PEMFCs) have recently piqued researchers’ interest because of their distinct advantages, such as (1) a simplified hydrothermal system, (2) enhanced battery reaction kinetics, and (3) high resistance of the catalyst to CO at high temperatures. − PEMs doped with polybenzimidazole (PBI) phosphoric acid (PA) are regarded as desirable PEMs for HT-PEMFCs. ,− However, membranes with excellent mechanical strength, oxidative stability, and high conductivity are still required.…”

Section: Introductionmentioning

confidence: 99%

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Constructing High-Performance Proton Transport Channels in High-Temperature Proton Exchange Membranes by Introducing Triazole Groups

Liu

Wang

2021

ACS Appl. Energy Mater.

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Recently, constructing proton transport channels has been considered an effective method to improve proton conductivity of high-temperature proton exchange membranes (PEM) with low phosphoric acid (PA)-doping levels. To construct proton transport channels, a metal−organic framework (MOF) is introduced into a polymer matrix. However, the MOF has poor compatibility with the polymer matrix as an inorganic substance. In this study, organic triazole-grafted poly(vinylbenzyl chloride) is synthesized and introduced into a cross-linked OPBI membrane to construct proton transport channels. Scanning electron microscopy (SEM) images show a homogeneous microstructure. Furthermore, proton transport channels are constructed in the membrane by introducing numerous triazole groups. The cross-linked OPBI has twice the proton conductivity of the linear OPBI, even with a low PA-doping level. All cross-linked membranes with a triazole group outperform OPBI membranes in terms of mechanical properties. The maximum power density of a single-cell test reaches 563 mW cm −2 at 160 °C under H 2 /O 2 , and it can be maintained for 500 h under a constant load of current discharge without manifest voltage degradation. These impressive results indicate that the moderately cross-linked membrane with triazole groups is one of the potential materials for PEM applications.

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Section: Resultsmentioning

confidence: 72%

“…In comparison with other work, the membranes have much longer long-term stability and smaller voltage drop. 13,34,55 4. CONCLUSIONS…”

Section: Results Andmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Constructing High-Performance Proton Transport Channels in High-Temperature Proton Exchange Membranes by Introducing Triazole Groups

Liu

Wang

2021

ACS Appl. Energy Mater.

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“…During this period, the carbon atom of TB units in the α-position will be attacked by OH – under alkaline conditions. In addition, after the ring-opening reaction of TB units, the micropores will disappear. − …”

Section: Resultsmentioning

confidence: 99%

“…The oxidative stability of all the membranes was evaluated by immersing samples (1 cm × 1 cm) in Fenton’s reagent (3% H 2 O 2 containing 4 ppm of FeSO 4 ) at 80 °C. − After 1 h, the membrane samples were washed several times with deionized water. The membrane samples were then dried in a vacuum oven.…”

Section: Methodsmentioning

confidence: 99%

Polymer Electrolyte Membranes from Microporous Troger’s Base Polymers for Fuel Cells

Yuan

Dong

et al. 2021

ACS Appl. Energy Mater.

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Fuel cells (FCs) have attracted much attention because of their high energy conversion efficiency and cleanliness. However, polyelectrolytes are a key component of FCs, and their cost and performance are not ideal at present, which is an obstacle to the development of FCs. Polymers of intrinsic microporosity (PIM) have attracted much attention as a class of membrane materials due to their three-dimensional pore structure, which can provide channels for ion transport. However, it remains challenging to prepare PIM membranes due to their poor solubility and brittleness. A novel soluble Troger’s base (TB)-PIM polymer is proposed in this paper. The prepared TB-based membranes with rigid and contorted backbones exhibit excellent dimensional stability (<8% swelling ratio at 60 °C), mechanical properties, and thermal stability and form subnanometer cavities to allow rapid ion transport. Therefore, the proton conductivity of the 4-(2-hydroxyethoxy)-1,3-phenylenediamine dihydrochloride (HEPD)/4,4′-diamine-3,3′-dimethyl-biphenyl (DMBP)-TB membrane is 58.3 mS/cm at 80 °C. The OH– conductivity of the HEPD/DMBP-QTB anion exchange membrane (AEM) is 105.9 mS/cm at 80 °C. Moreover, the single cell assembled with an HEPD/DMBP-QTB AEM showed a peak power density of 76.6 mW/cm2 in H2 air (CO2-free) at 60 °C.

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Nitrogen‐Rich Rigid Polybenzimidazole With Phosphoric Acid Shows Promising Electrochemical Activity and Stability for High‐Temperature Proton Exchange Membrane Fuel Cells

Gao

Wang

et al. 2023

Adv Funct Materials

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Polybenzimidazoles (PBIs) are the most promising binders for the catalyst layer (CL) in high‐temperature proton exchange membrane fuel cells (HT‐PEMFC). However, traditional commercial PBIs are not applied in binders because they do not enhance the electrochemical performance and because the related solvents are not environmentally friendly. In addition, proton transfer channels in PBIs are not investigated at the microscopic and atomic scales to date. In this study, a nitrogen‐rich rigid PBI binder containing pyridine, diazofluorene, and partially grafted nitrile (PBPBI‐3CN) is prepared with a functionalized structure, good thermal stability, and good solubility in an environmentally friendly solvent. A membrane electrode assembly (MEA) is fabricated with the PBPBI‐3CN binder, providing a high peak power density, low resistance, and good stability. The protonation, hydrogen bond networks, and platform for proton transfer are confirmed in the CLs. The protonation of PBPBI‐3CN occurs in two steps. First, some phosphoric acid (PA) molecules bind to nitrogen‐containing acidophilic groups via preliminary protonation; second, multiple PA molecules then interact with nitrogen‐containing acidophilic groups via further protonation. With protonation as the foundation, a sufficient amount of PA molecules form a hydrogen bond network, and proton transfer channels are established.

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Multifunctional poly(ionic liquid)s cross-linked polybenzimidazole membrane with excellent long-term stability for high temperature-proton exchange membranes fuel cells

Cited by 74 publications

References 61 publications

Constructing High-Performance Proton Transport Channels in High-Temperature Proton Exchange Membranes by Introducing Triazole Groups

Constructing High-Performance Proton Transport Channels in High-Temperature Proton Exchange Membranes by Introducing Triazole Groups

Polymer Electrolyte Membranes from Microporous Troger’s Base Polymers for Fuel Cells

Nitrogen‐Rich Rigid Polybenzimidazole With Phosphoric Acid Shows Promising Electrochemical Activity and Stability for High‐Temperature Proton Exchange Membrane Fuel Cells

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