Preparation and study of spirocyclic cationic side chain functionalized polybiphenyl piperidine anion exchange membrane

Wang, Fanghui; Li, Yunxi; Li, CongHui; Hong, Zhu

doi:10.1016/j.memsci.2020.118919

Cited by 51 publications

(39 citation statements)

References 48 publications

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“…These results were comparable with previously published values for AEMs functionalized with DMP or ASU cations with similar or higher IECs (Table ). For example, Zhu et al recently introduced ASU cations on side chains to poly(biphenyl piperidine) and an AEM denoted PBP-BOP-ASU 8% reached a OH – conductivity of 117 mS cm –1 at 80 °C (IEC = 2.65 mequiv g –1 ) …”

Section: Resultsmentioning

confidence: 99%

“…For example, Zhu et al recently introduced ASU cations on side chains to poly(biphenyl piperidine) and an AEM denoted PBP-BOP-ASU 8% reached a OH − conductivity of 117 mS cm −1 at 80 °C (IEC = 2.65 mequiv g −1 ). 49 The dependence of the OH − conductivity on the water uptake of the AEMs is shown in Figure 4b. As expected, the OH − conductivity increased with increasing water uptake and temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Inspired by this influential work, many different AEMs based on DMP and ASU cations have been prepared and studied by us ,, and other research groups. ,, The results have shown high alkaline stability in both ex situ experiments − and fuel cell evaluations. − For example, we , and others ,,, have prepared and investigated poly(arylene piperidinium) by polyhydroxylalkylations involving piperidone, which provides an ether-free polymer incorporating DMP cations in the backbone after methylation of the piperidine rings. Alternatively, cyclo-quaternization with 1,5-dibromopentane results in spirocyclic ASU cations. , …”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, cyclo-quaternization with 1,5-dibromopentane results in spirocyclic ASU cations. 48,49 Stability evaluations of AEMs incorporating DMP and ASU cations generally show that their resistance against hydroxide attack is highly dependent on their precise position in the polymer architecture. 11 Cations attached in benzylic positions are especially sensitive toward substitution and may also induce backbone scission.…”

Section: Introductionmentioning

confidence: 99%

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Poly(arylene piperidine) Anion Exchange Membranes with Tunable N-Alicyclic Quaternary Ammonium Side Chains

Pan

Pham

Jannasch

2021

ACS Appl. Energy Mater.

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To develop anion exchange membranes (AEMs) that combine high chemical stability and hydroxide conductivity, we have designed and prepared poly(arylene piperidine)s carrying tunable mono- or dicationic side chains. Poly(biphenyl piperidine) and poly(biphenyl N-methylpiperidine), respectively, were first synthesized by superacid-catalyzed polyhydroxylalkylations. Subsequently, the piperidine rings of these polymers were reacted with bromoalkylated N,N-dimethylpiperidinium (DMP) and 6-azonia-spiro[5.5]undecane (ASU) cations, respectively. This gave two series of AEMs in which the polymer backbone contained tertiary and quaternary piperidine rings, respectively, resulting in mono- and dicationic side chains in series 1 and 2, respectively. In series 1, both the piperidine rings in the backbone and the pendant cations in the side chains showed excellent alkaline stability, resulting in AEMs, which retained more than 92% of the cations after storage in 2 M NaOH at 90 °C during 30 days. In addition, these AEMs reached a hydroxide conductivity up to 131 mS cm–1 at 80 °C. Benefiting from a high local ionic concentration through the dicationic configuration, the AEMs in series 2 reached a higher conductivity, almost 170 mS cm–1 at 80 °C at moderate water uptake and swelling. Still, these AEMs were more vulnerable to hydroxide attack than the ones in series 1 because of the quaternary piperidinium groups placed in the polymer backbone. In conclusion, the AEMs in series 1 can be employed in electrochemical devices that operate under harsh alkaline conditions, while those in series 2 should be preserved for less aggressive alkaline conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Poly(arylene piperidine) Anion Exchange Membranes with Tunable N-Alicyclic Quaternary Ammonium Side Chains

Pan

Pham

Jannasch

2021

ACS Appl. Energy Mater.

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“…Nevertheless, the performance of PPO-QG-12 AEM is not comparable to those of some outstanding AEMs in literatures. [61][62][63] It should be noted that, in addition to AEMs, the single-cell performance is also significantly affected by other operation parameters such as the cell temperature, catalysts, gas flow rates and ionomers, and so forth. Thus, the single-cell performances of PPO-QG-x AEMs are expected to improve by optimizing the testing conductions and electrode composition in our future work.…”

Section: Single-cell Performancementioning

confidence: 99%

Improving the conductivity and dimensional stability of anion exchange membranes by grafting of quaternized dendrons

Wei

Jiang

et al. 2022

Journal of Polymer Science

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High conductivity is critical for the practical applications of anion exchange membranes (AEMs) in fuel cells. In this study, a new strategy for enhanced conductivity and dimensional stability of AEMs by incorporating quaternized dendrons is proposed. Thanks to the introduced quaternized dendrons, distinct nanoscale phase separation and well-connected ion conductive channels are formed in the as-prepared membranes (PPO-QG-x). As a result, PPO-QG-x AEMs achieve high hydroxide conductivities up to 65.5 mS cm À1 at 20 C and 121.5 mS cm À1 at 80 C (IEC = 1.95 mmol g À1 ), while possessing good dimensional stability. Meanwhile, PPO-QG-x AEMs show good alkaline stability with the maximum loss in conductivity of 15.1% after treated in 2 M NaOH at 80 C for 960 h. In addition, the single-cell assembled with PPO-QG-12 membrane exhibit a peak power density of 249.4 mW cm À2 at 60 C. Overall, this work provides a new insight to achieve high conductivity of AEMs.

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Fluorinated Poly(aryl piperidinium) Membranes for Anion Exchange Membrane Fuel Cells

Chen

et al. 2023

Advanced Materials

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Anion-exchange-membrane fuel cells (AEMFCs) are a cost-effective alternative to proton-exchange-membrane fuel cells (PEMFCs). The development of high-performance and durable AEMFCs requires highly conductive and robust anion-exchange membranes (AEMs). However, AEMs generally exhibit a trade-off between conductivity and dimensional stability. Here, a fluorination strategy to create a phase-separated morphological structure in poly(aryl piperidinium) AEMs is reported. The highly hydrophobic perfluoroalkyl side chains augment phase separation to construct interconnected hydrophilic channels for anion transport. As a result, these fluorinated PAP (FPAP) AEMs simultaneously possess high conductivity (>150 mS cm −1 at 80 °C) and high dimensional stability (swelling ratio <20% at 80 °C), excellent mechanical properties (tensile strength >80 MPa and elongation at break >40%) and chemical stability (>2000 h in 3 m KOH at 80 °C). AEMFCs with a non-precious Co-Mn spinel cathode using the present FPAP AEMs achieve an outstanding peak power density of 1.31 W cm −2 . The AEMs remain stable over 500 h of fuel cell operation at a constant current density of 0.2 A cm −2 .

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Preparation and study of spirocyclic cationic side chain functionalized polybiphenyl piperidine anion exchange membrane

Cited by 51 publications

References 48 publications

Poly(arylene piperidine) Anion Exchange Membranes with Tunable N-Alicyclic Quaternary Ammonium Side Chains

Poly(arylene piperidine) Anion Exchange Membranes with Tunable N-Alicyclic Quaternary Ammonium Side Chains

Improving the conductivity and dimensional stability of anion exchange membranes by grafting of quaternized dendrons

Fluorinated Poly(aryl piperidinium) Membranes for Anion Exchange Membrane Fuel Cells

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