Epoxides cross-linked hexafluoropropylidene polybenzimidazole membranes for application as high temperature proton exchange membranes

Yang, Jingshuai; Xu, Yan; Li, Peipei; Gao, Liping; Che, Quantong

doi:10.1016/j.electacta.2015.01.094

Cited by 68 publications

(46 citation statements)

References 40 publications

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“…As summarized in Table , the membrane based on linear PBI in the present work showed a residual mass of 72% after 336 h in the Fenton solution. The corresponding values for the cross‐linked membranes was considerably higher and ranged from 83–89%, in consistence with findings in literature , , .…”

Section: Resultssupporting

confidence: 91%

Fuel Cell Electrolytes of Polybenzimidazole Membranes Cross‐linked with Bis(chloromethyl) Arenes

et al. 2018

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Cross‐linking of phosphoric acid doped polybenzimidazole membranes as fuel cell electrolytes represents an attractive approach to improving the mechanical robustness at a high acid loading. Numerous cross‐linking concepts have been reported in the literature, but a deeper understanding of how the cross‐linking chemistry affects the physicochemical properties of the membrane and its fuel cell performance and durability remains to be assessed. In this work, a series of cross‐linked membranes are prepared using cross‐linking agents of different regio‐chemistry and steric nature. It is shown, that the nature of the cross‐linking agent has a large impact on the effective degree of cross‐linking, which in turn determines the acid doping characteristics and ultimately the fuel cell performance and acid retention during long‐term operation.

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Section: Resultssupporting

confidence: 91%

Fuel Cell Electrolytes of Polybenzimidazole Membranes Cross‐linked with Bis(chloromethyl) Arenes

et al. 2018

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“…The initial dimension of dumb‐bell shaped membrane samples was 25 mm in length and 4 mm in width. Conductivities of acid doped membranes were measured using a four‐probe conductivity cell with a frequency about 3 kHz under ambient air without any humidification as described elsewhere . The whole cell was kept in an oven for controlling the temperature.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, various modified approaches for PBI‐based electrolytes have been developed in order to improve such as the mechanical strength without or with less sacrifice of the proton conductivity, and vice versa. The reported explorations, for instance, include increasing the molecular weight of the PBI polymer, fabrication of composite membranes with nano inorganic compounds, synthesis of PBI variants, ionic and covalent crosslinking of the PBI chains …”

Section: Introductionmentioning

confidence: 99%

“…Generally, the covalent crosslinking of PBI membranes is achieved via the S N 2 reaction by linking chemically reactive imidazole groups of PBI with electrophilic crosslinking agents containing two or more active groups. The small molecule reagents such as halide and epoxide compounds are normally used as the crosslinkers . In order to improve the polymer properties, we proposed to modify PBI‐based membranes substantially by means of “polymer covalently crosslinking polymer” .…”

Section: Introductionmentioning

confidence: 99%

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Strengthening Phosphoric Acid Doped Polybenzimidazole Membranes with Siloxane Networks for Using as High Temperature Proton Exchange Membranes

Yang

Gao

Wang

et al. 2017

Macro Chemistry & Physics

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Two silane compounds, i.e., ((chloromethyl)phenylethyl)trimethoxysilane (Ph‐Si) and 3‐chloropropyltriethoxysilane (Pr‐Si), are employed as covalent crosslinkers to fabricate high temperature proton exchange membranes based on polybenzimidazole (PBI) in order to better understand the correlation between the structure and the property of the crosslinked membranes. All the crosslinked PBI membranes display longer morphology durability over the neat PBI membrane toward the radical oxidation. The crosslinked membranes with the crosslinker containing a rigid group of phenylene (PBI‐Ph) show superior acid doping level, high conductivity, and excellent mechanical strength simultaneously, comparing to those with the crosslinker having a flexible alkyl chain (PBI‐Pr) and the pristine PBI based membrane. The technical feasibility for using as high temperature proton exchange membranes is demonstrated by the acid doped crosslinked PBI‐Ph membranes via fuel cell tests.

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“…The acid‐doping ability, proton conductivity, mechanical properties, and oxidative stabilities were improved significantly by the end‐group cross‐link process through a 4,40‐diglycidyl (3,30,5,50‐tetramethylbiphenyl) epoxy resin (TMBP) on the PBI membrane . Yang investigated the effects of three types of epoxides as the cross‐linking agent on a PBI membrane: bisphenol A diglycidyl ether (R1), bisphenol A propoxylate diglycidyl ether (R2), and poly(ethylene glycol) diglycidyl ether (R3). The mechanical strength improved, and high acid‐doping levels increased the proton conductivity for the cross‐linked membrane.…”

Section: Additives In Different Types Of Membranesmentioning

confidence: 99%

Recent advances in additive‐enhanced polymer electrolyte membrane properties in fuel cell applications: An overview

2019

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Summary Additives such as fillers, cross‐linkers, and plasticizers have become increasingly important in the polymer nanocomposite production field, especially for enhancing the structural morphology, functional behavior, and final performance of nanocomposites in broad applications. The current work is an overview of the effects of additive substances such as fillers, cross‐linkers, and plasticizers in the polymer electrolyte membrane composites applied to fuel cells. A comparative review is conducted by categorizing fillers into several types, and the most popular cross‐linkers and plasticizers used in fuel cell membranes are included in this review. The highlighted properties include the proton conductivity, permeability, mechanical properties, thermal properties, crystallinity, and structure of additive‐modified nanocomposites. Furthermore, the challenges and future prospects in the additive field are discussed in Section 5.0. This review can provide a reference for researchers seeking specific substances that can be used to enhance nanocomposite properties, especially in membrane fuel cell applications.

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Epoxides cross-linked hexafluoropropylidene polybenzimidazole membranes for application as high temperature proton exchange membranes

Cited by 68 publications

References 40 publications

Fuel Cell Electrolytes of Polybenzimidazole Membranes Cross‐linked with Bis(chloromethyl) Arenes

Fuel Cell Electrolytes of Polybenzimidazole Membranes Cross‐linked with Bis(chloromethyl) Arenes

Strengthening Phosphoric Acid Doped Polybenzimidazole Membranes with Siloxane Networks for Using as High Temperature Proton Exchange Membranes

Recent advances in additive‐enhanced polymer electrolyte membrane properties in fuel cell applications: An overview

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