Comparison of the Conduction Properties of Phosphoric Acid Doped and Benzylsulfonate Grafted Polybenzimidazole

Glipa, Xavier; Mula, Bernard; Jones, Deborah J.; Rozière, Jacqués

doi:10.1016/b978-1-85573-801-0.50026-1

Cited by 4 publications

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“…In 1 M sulfuric acid, conductivities of 19.1 ± 1.64 mS/cm for M-PPFSt-MTZ-Me 3 and 13.5 ± 0.68 mS/cm for M-PPFSt-MTZ-Me 4 were measured. It is known, as shown in Figure 4, that the imidazole moiety of PBI is protonated in an acidic medium, with hydrogen sulfate counter ions significantly contributing to ion conductivity [31]. Thus, the conductivity of pure F6-PBI membrane was also investigated, which was 6.22 ± 0.27 mS/cm in 1 M sulfuric acid.…”

Section: Lengthmentioning

confidence: 99%

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Novel Anion Exchange Membrane Based on Poly(Pentafluorostyrene) Substituted with Mercaptotetrazole Pendant Groups and Its Blend with Polybenzimidazole for Vanadium Redox Flow Battery Applications

et al. 2020

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In order to evaluate the performance of the anion exchange membranes in a vanadium redox flow battery, a novel anion exchange polymer was synthesized via a three step process. Firstly, 1-(2-dimethylaminoethyl)-5-mercaptotetrazole was grafted onto poly(pentafluorostyrene) by nucleophilic F/S exchange. Secondly, the tertiary amino groups were quaternized by using iodomethane to provide anion exchange sites. Finally, the synthesized polymer was blended with polybenzimidazole to be applied in vanadium redox flow battery. The blend membranes exhibited better single cell battery performance in terms of efficiencies, open circuit voltage test and charge-discharge cycling test than that of a Nafion 212 membrane. The battery performance results of synthesized blend membranes suggest that those novel anion exchange membranes are promising candidates for vanadium redox flow batteries.Polymers 2020, 12, 915 2 of 14 and superior chemical stability; however, it has been found that Nafion ® type membranes suffer from high vanadium ion cross-over, resulting in fast capacity fade when used in VRFBs [4,5].In the last decade, interest in using AEMs in various applications, such as alkaline anion exchange membrane fuel cells [6], alkaline anion exchange membrane water electrolysis [7], ionic polymer membrane actuators [8], dye-sensitized solar cells [9], CO 2 pumps [10] and redox flow batteries [11] has strongly increased. In a recent review paper, the number of journal articles published in the field of anion exchange membranes was analyzed using Web of Science (SCI-EXPANDED), showing a steady growth since 2007 [12]. The significant advantage of AEMs when applied in a VRFB is that their positively charged fixed ion groups (commonly quaternary ammonium) exclude positively charged, strongly oxidizing vanadium ions from the membrane interior due to the Donnan exclusion effect, leading to extremely low vanadium ion cross-over [11].Additionally, modified poly(pentafluorostyrene) (PPFSt) was applied in proton exchange membrane fuel cells as sulfonated [13] or phosphonated [14] CEMs, exhibiting outstanding oxidative and thermal stabilities, which were better than those of their non-fluorinated styrene polymer analogs due to the higher bond strengths of the C-F bonds compared to those of C-H bonds [15]. The outstanding stability of PPFSt-based CEMs inspired us to find a route to prepare a PPFSt-based anion exchange polymer with the advantages of AEMs. Introducing spacer units between the polymer backbone and the side chains in an AEM was thought to lead to an enhanced ion-conductivity, which might be facilitated by an improved phase separation between the hydrophobic polymer backbone and the cation-carrying side chains [16]. Tetrazole tethered polymers showed an improved conductivity compared to that of tetramethylammonium-based quaternized poly(phenylene oxide) AEMs, which is thought to be caused by the long-range hydrogen bond network formation by the tetrazole moiety contributing to the ion conductivity [17].In this study, we synthesize...

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Section: Lengthmentioning

confidence: 99%

“…The protonation of partially fluorinated and highly stable polybenzimidazole (F6-PBI) when doped with sulfuric acid[31].…”

mentioning

confidence: 99%

Novel Anion Exchange Membrane Based on Poly(Pentafluorostyrene) Substituted with Mercaptotetrazole Pendant Groups and Its Blend with Polybenzimidazole for Vanadium Redox Flow Battery Applications

et al. 2020

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Advances in the Development of Inorganic–Organic Membranes for Fuel Cell Applications

Jones

Rozière

Fuel Cells I

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Recent advances in the functionalisation of polybenzimidazole and polyetherketone for fuel cell applications

Jones

Rozière

2001

Journal of Membrane Science

551

249

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Comparison of the Conduction Properties of Phosphoric Acid Doped and Benzylsulfonate Grafted Polybenzimidazole

Cited by 4 publications

References 15 publications

Novel Anion Exchange Membrane Based on Poly(Pentafluorostyrene) Substituted with Mercaptotetrazole Pendant Groups and Its Blend with Polybenzimidazole for Vanadium Redox Flow Battery Applications

Novel Anion Exchange Membrane Based on Poly(Pentafluorostyrene) Substituted with Mercaptotetrazole Pendant Groups and Its Blend with Polybenzimidazole for Vanadium Redox Flow Battery Applications

Advances in the Development of Inorganic–Organic Membranes for Fuel Cell Applications

Recent advances in the functionalisation of polybenzimidazole and polyetherketone for fuel cell applications

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