Constructing micro-phase separation structure to improve the performance of anion-exchange membrane based on poly(aryl piperidinium) cross-linked membranes

Du, Xinming; Zhang, Hongyu; Yuan, Yongjiang; Wang, Zhe

doi:10.1016/j.jpowsour.2020.229429

Cited by 106 publications

(62 citation statements)

References 56 publications

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“…To further validate the critical role of the ordered microchannel structure of the 2D COF in the improvement of hydroxide conduction, the hydroxide conductivity of the TJU-1 membrane is compared with that of the state-of-the-art AEMs. 36–57 Fig. 5c illustrates that the TJU-1 membrane exhibits relatively high IEC and hydroxide conductivity among the AEMs, which is reasonably ascribed to the well-connected channels within TJU-1.…”

Section: Resultsmentioning

confidence: 85%

A covalent organic framework membrane with enhanced directional ion nanochannels for efficient hydroxide conduction

Chen

Zhang

et al. 2022

J. Mater. Chem. A

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Section: Resultsmentioning

confidence: 85%

A covalent organic framework membrane with enhanced directional ion nanochannels for efficient hydroxide conduction

Chen

Zhang

et al. 2022

J. Mater. Chem. A

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“…The ion conductivity remains modest although the IEC is quite high, indicating a low anion mobility possibly due to an insufficient connectivity of ion-conduction paths in the composite membranes. A possible strategy to overcome this limitation is to improve the phase separation, perhaps by adding longer spacers or changing the TMA with other groups, such as piperidine [ 60 , 61 ]. Furthermore, one could explore blends with more flexible polymers or better organized composites.…”

Section: Resultsmentioning

confidence: 99%

Anion-Conducting Polymer Electrolyte without Ether Linkages and with Ionic Groups Grafted on Long Side Chains: Poly(Alkylene Biphenyl Butyltrimethyl Ammonium) (ABBA)

et al. 2022

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In this work we report the synthesis of the new ionomer poly(alkylene biphenyl butyltrimethyl ammonium) (ABBA) with a backbone devoid of alkaline-labile C-O-C bonds and with quaternary ammonium groups grafted on long side chains. The ionomer was achieved by metalation reaction with n-butyllithium of 2-bromobiphenyl, followed by the introduction of the long chain with 1,4-dibromobutane. The reaction steps were followed by 1H-NMR spectroscopy showing the characteristic signals of the Br-butyl chain and indicating the complete functionalization of the biphenyl moiety. The precursor was polycondensed with 1,1,1-trifluoroacetone and then quaternized using trimethylamine (TMA). After the acid catalyzed polycondensation, the stoichiometric ratio between the precursors was respected. The quaternization with TMA gave a final degree of amination of 0.83 in agreement with the thermogravimetric analysis and with the ion exchange capacity of 2.5 meq/g determined by acid–base titration. The new ionomer blended with poly(vinylalcohol) (PVA) or poly(vinylidene difluoride) (PVDF) was also characterized by water uptake (WU) and ionic conductivity measurements. The higher water uptake and ionic conductivity observed with the PVDF blend might be related to a better nanophase separation.

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“…[28][29][30] Crosslinking is another approach that improves the chemical stability of the membranes as compared with that of their non-crosslinked analogues. 24,[31][32][33][34] In our previous study, we prepared crosslinked polybenzimidazole (PBI)-based AEMs via a thiol-ene reaction with quaternary ammonium and allyl side-chains with IEC values from 1.50 to 2.50 mmol/g. These AEMs showed moderate ionic conductivity, alkaline stability and low dimensional change.…”

Section: Introductionmentioning

confidence: 99%

“…It was discovered that PPO‐based AEMs with quaternary ammonium groups on the side chains exhibited excellent alkaline stability 28–30 . Crosslinking is another approach that improves the chemical stability of the membranes as compared with that of their non‐crosslinked analogues 24,31–34 …”

Section: Introductionmentioning

confidence: 99%

Synthesis of ionic polybenzimidazoles with broad ion exchange capacity range for anion exchange membrane fuel cell application

Abdi

Chen

Chiu

et al. 2021

Journal of Polymer Science

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In this study, new anion exchange membranes (AEM) based on crosslinked polybenzimidazole (m-PBI) with quaternary ammonium groups, crosslinkable allyl groups, and hydrophobic ethyl groups as side chains are synthesized and characterized. The AEMs are crosslinked by thermal thiol-ene reaction using a dithiol crosslinker. The ion exchange capacity (IEC) values and crosslinking density were controlled by the number of quaternary ammonium groups and allyl groups, respectively. The introduction of ethyl groups improved the solubility of ionic PBIs even at very low IEC values by eliminating the hydrogen bonding interaction of imidazole rings. This method allows ionic PBIs with broad IEC values, from 0.75 to 2.55 mmol/g, to be prepared. The broad IEC values were achieved by independently controlling the numbers of quaternary ammonium groups, allyl groups, and hydrophobic ethyl groups during preparation. The crosslinked ionic PBIs revealed hydroxide conductivity from 16 to 86 mS/cm at 80 C. The wet membranes also showed excellent mechanical strength with tensile strength of 12.2 to 20.1 MPa and Young's Modulus of 0.67 to 1.45 GPa. The hydroxide conductivity of a crosslinked membrane (0.40Q0.60Et1.00Pr, IEC = 0.95 mmol/g) decreased only 7.9% after the membranes was immersed in a 1.0 M sodium hydroxide solution at 80 C for 720 h.A single fuel cell based on this membrane showed a maximum peak power density of 136 mW/cm 2 with a current density of 377 mA /cm 2 at 60 C.

show abstract

Constructing micro-phase separation structure to improve the performance of anion-exchange membrane based on poly(aryl piperidinium) cross-linked membranes

Cited by 106 publications

References 56 publications

A covalent organic framework membrane with enhanced directional ion nanochannels for efficient hydroxide conduction

A covalent organic framework membrane with enhanced directional ion nanochannels for efficient hydroxide conduction

Anion-Conducting Polymer Electrolyte without Ether Linkages and with Ionic Groups Grafted on Long Side Chains: Poly(Alkylene Biphenyl Butyltrimethyl Ammonium) (ABBA)

Synthesis of ionic polybenzimidazoles with broad ion exchange capacity range for anion exchange membrane fuel cell application

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