Cross-linked sulfonated poly(ether ether ketone) electrolytes bearing pendent imidazole groups for high temperature proton exchange membrane fuel cells

Jiang, Jingjing; Zhu, Xingye; Qian, Huidong; Xu, Jianfeng; Yue, Zhouying; Zou, Zhiqing; Yang, Hui

doi:10.1039/c9se00318e

Cited by 36 publications

(27 citation statements)

References 34 publications

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“…The reason behind the higher PA loading of the composite membranes than the pristine OPBI can be a cumulative effect of several factors. First, both PSM 1 and PSM 2 consist of hydrophilic "−SO 3 H" groups, and with the increase in the loading of PSM 1 and PSM 2 in the composites Second, the sulfonic acid groups interact with nitrogen in the imidazole ring of OPBI to produce a more regular structure (a certain order of crystallinity has been observed in the PXRD analysis) and a bigger space between the chains that can easily accommodate a larger amount of absorbed PA. 61 PA doping disturbs the original crystalline ordering 62 and decreases the peak intensities of the * marked peaks in the 2θ range between 25°and 30°for PA doped samples (see Figure S1a,b in the Supporting Information). This change in the crystallinity is accompanied with partial disruption of the pre-existing Hbonded structure and development of new H-bonds involving the newly absorbed PA molecules and the "−SO 3 H" groups and "N−H" groups already present in the membrane.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Fabricating a MOF Material with Polybenzimidazole into an Efficient Proton Exchange Membrane

Mukhopadhyay

Das

Jana

et al. 2020

ACS Appl. Energy Mater.

127

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Metal organic frameworks (MOFs) have received considerable importance as proton conducting materials in recent times. However, most of the MOFs lack the ability to form film, which limits their application. In the present work, polybenzimidazole (PBI) composite membranes have been prepared by loading post synthetically modified (PSM) UiO-66-NH 2 MOFs, denoted as PSM 1 and PSM 2 into an aryl ether-type polybenzimidazole (OPBI) polymer. The pristine OPBI, and MOF nanofiller loaded membranes were doped with phosphoric acid (PA) to prepare proton exchange membranes (PEMs). Use of thermally stable, hydrophilic MOFs resulted in enhanced proton conductivity, higher PA retention capacity, and increased stability against oxidative degradation for the composite membrane than the pristine OPBI polymer. The proton conductivities of the composite membranes (0.29 S cm −1 for PSM 1-10% and 0.308 S cm −1 for PSM 2-10% membranes at 160 °C, under anhydrous environment) were notably higher than the conductivities of the constituents and also higher than most of the MOF based polymer supported membranes. To the best of our knowledge, the PA doped PSM 2 loaded composite membrane shows the highest proton conductivity at 160 °C among all MOF based composite membranes. Extensive interfacial H-bonding plays the most crucial role behind the enhanced proton conductivities of the PA doped MOF containing polymer membranes reported here. This work clearly demonstrates the benefits of using rationally designed PSM 1 and PSM 2 MOFs as nanofiller to prepare OPBI supported membranes that can perform excellent proton conduction in a wide temperature range spanning up to 160 °C. This provides a generalized approach toward achieving an efficient proton conducting membrane for use in fuel cells.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Fabricating a MOF Material with Polybenzimidazole into an Efficient Proton Exchange Membrane

Mukhopadhyay

Das

Jana

et al. 2020

ACS Appl. Energy Mater.

127

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“…However, due to the strong plasticization of PA molecules, high proton conductivity is usually at the expense of the mechanical strength of the membrane [14][15][16][17]. Besides, the preparation of a high-strength PA-PBI membrane requires high molecular weight of PBI, which exhibits poor solubility in organic solvents and makes it fairly hard to prepare uniform casting solution [18]. Therefore, to realize high-performance HT-PEMs and high-efficiency HT-PEMFCs, it is one of the important issues to settle the balance between proton conductivity and mechanical properties of phosphoric acid-doped polymer membranes.…”

Section: Introductionmentioning

confidence: 99%

3D Network Structural Poly (Aryl Ether Ketone)-Polybenzimidazole Polymer for High-Temperature Proton Exchange Membrane Fuel Cells

Jiang

Xiao

et al. 2020

Advances in Polymer Technology

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Poor mechanical property is a critical problem for phosphoric acid-doped high-temperature proton exchange membranes (HT-PEMs). In order to address this concern, in this work, a 3D network structural poly (aryl ether ketone)-polybenzimidazole (PAEK-cr-PBI) polymer electrolyte membrane was successfully synthesized through crosslinking reaction between poly (aryl ether ketone) with the pendant carboxyl group (PAEK-COOH) and amino-terminated polybenzimidazole (PBI-4NH2). PAEK-COOH with a poly (aryl ether ketone) backbone endows superior thermal, mechanical, and chemical stability, while PBI-4NH2 serves as both a proton conductor and a crosslinker with basic imidazole groups to absorb phosphoric acid. Moreover, the composite membrane of PAEK-cr-PBI blended with linear PBI (PAEK-cr-PBI@PBI) was also prepared. Both membranes with a proper phosphoric acid (PA) uptake exhibit an excellent proton conductivity of around 50 mS cm-1 at 170°C, which is comparable to that of the well-documented PA-doped PBI membrane. Furthermore, the PA-doped PAEK-cr-PBI membrane shows superior mechanical properties of 17 MPa compared with common PA-doped PBI. Based upon these encouraging results, the as-synthesized PAEK-cr-PBI gives a highly practical promise for its application in high-temperature proton exchange membrane fuel cells (HT-PEMFCs).

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“…For example, sulfonated poly(phenylene)s, 10,11 poly(ether ether ketone)s 12 , poly(arylene ether sulfone)s 13 and polyimides 14 can be found as proton-exchange membranes in the literature, and some of these have been applied as electrode binders. [15][16][17][18][19][20][21] Recently, E.…”

Section: Introductionmentioning

confidence: 99%

An aromatic ionomer in the anode catalyst layer improves the start-up durability of polymer electrolyte fuel cells

2022

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Cross-linked sulfonated poly(ether ether ketone) electrolytes bearing pendent imidazole groups for high temperature proton exchange membrane fuel cells

Abstract: A series of ionic-covalently cross-linked SPEEK bearing imidazole groups have been synthesized for high temperature fuel cells.

Cited by 36 publications

References 34 publications

Fabricating a MOF Material with Polybenzimidazole into an Efficient Proton Exchange Membrane

Fabricating a MOF Material with Polybenzimidazole into an Efficient Proton Exchange Membrane

3D Network Structural Poly (Aryl Ether Ketone)-Polybenzimidazole Polymer for High-Temperature Proton Exchange Membrane Fuel Cells

An aromatic ionomer in the anode catalyst layer improves the start-up durability of polymer electrolyte fuel cells

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