High-performance tetracyclic aromatic anion exchange membranes containing twisted binaphthyl for fuel cells

Gao, Wei; Gao, Xue Lang; Gou, Wei; Wang, Jia Jun; Cai, Zhi Hong; Zhang, Qiu Gen; Zhu, Ai Mei; Liu, Qing Lin

doi:10.1016/j.memsci.2022.120578

Cited by 72 publications

(43 citation statements)

References 69 publications

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“…Carbazole, a nitrogen heterocyclic compound favored by researchers, has a distinctive structure with broad conjugation planes and unique reaction sites (the 3 and 6 reaction sites of HC). , The above structural features improve the chemical stability, ionomer phenyl adsorption, and curvature of copolymers. − Moreover, the introduction of flexible alkyl chains significantly improved the alkaline stability and physics properties of HC . Numerous studies have reported the outstanding alkaline stability of N , N -dimethylpiperidinium. ,− Meanwhile, TP and 1M4P can be copolymerized into polymers with a high molecular weight and a low swelling .…”

Section: Resultsmentioning

confidence: 99%

“…Hence, PCTP-n has a larger curvature and free volume than PBTP. 49,51 The fractional free volume (FFV) from the magnetic levitation balance adsorption is shown in Table S2 to further demonstrate the high curvature and large free volume of PCTP-n. The FFV value of PCTP-n (0.256− 0.264) is 1.45−1.49 times that of PBTP (0.177).…”

Section: Structural Characteristics and Synthesis Of Pctpn And Pbtpmentioning

confidence: 99%

“…These signals at 4.98, 5.37, and 6.57 ppm are from the degradation of the functional group. 44,49 Comparing the 1 H NMR spectra at 0 and 1080 h, the degradation of the PCTP-6 AEM is about 15%. This suggests that PCTP-6 has desirable alkaline stability in a harsh alkaline environment.…”

Section: Alkaline Stabilitymentioning

confidence: 99%

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Effect of Hydrophobic Side Chain Length on Poly(carbazolyl terphenyl piperidinium) Anion Exchange Membranes

Cai

Gao

et al. 2022

ACS Appl. Energy Mater.

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In recent years, with the continuous application of superacid-catalyzed condensation reaction in the preparation of anion exchange membranes (AEMs), a number of AEMs with excellent performance have been designed. Among them, the method to copolymerize two aromatic compounds with piperidone via a superacid-catalyzed reaction to synthesize anionic conducting copolymers has been widely discussed by researchers. Here, we focus on the introduction of poly(N-alkylcarbazole-co-terphenyl N,N′-dimethylpiperidinium) (PCTP-n), which is formed by copolymerizing different chain lengths of N-alkylcarbazole (AHC, n = 2, 4, and 6) and p-terphenyl with 1-methyl-4-piperidone (1M4P). As a result of the high-curvature backbone and hydrophobic flexible side chains, the PCTP-n AEMs show comprehensive performance advantage. Among them, the PCTP-6 membrane, with an ultralow swelling (7.9%) and an excellent OH– conductivity retention (91.9% in 2 M NaOH at 80 °C after 1080 h), highlights high dimensional stability and alkaline resistance. Then, the PCTP-2 membrane displays excellent mechanical robustness (EB: 40%, TS: 20 MPa) and a decent OH– conductivity (134 mS cm–1 at 80 °C). Furthermore, the PCTP-2-based single cell exhibits a decent power density of 542 mW cm–2 under H2–O2 condition.

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Section: Resultsmentioning

confidence: 99%

Section: Structural Characteristics and Synthesis Of Pctpn And Pbtpmentioning

confidence: 99%

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Effect of Hydrophobic Side Chain Length on Poly(carbazolyl terphenyl piperidinium) Anion Exchange Membranes

Cai

Gao

et al. 2022

ACS Appl. Energy Mater.

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“…The IEC of QPDI-a was tested by a Mohr titration method . The weight of dried QPDI-a was recorded as w d .…”

Section: Methodsmentioning

confidence: 99%

“…The AEMs maintained their ionic conductivity and flexibility after 2000 h in 1 M KOH solution at 100 °C . At the same time, the durability and performance of the membrane can also be further improved by introducing a flexible spacer, arrangement of various cations, , cross-linking, − branching, and other methods. Gao et al synthesized a series of novel cross-linked AEMs, which combine a hydrophobic fluorine-based skeleton with a hydrophilic long flexible polycationic side chain, and showed good chemical stability when immersed in 10 M KOH for 1000 h at 80 °C …”

Section: Introductionmentioning

confidence: 95%

High Conductive Anion Exchange Membranes from All-Carbon Twisted Intrinsic Microporous Polymers

et al. 2022

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This study obtained solution-tractable anion-selective membranes with intrinsic porous and highly ionic conductive capabilities by a convenient route. We used the coplanar structure of 9,9-dimethylxanthene to construct a rigid twisted intrinsic microporous all-carbon skeleton PDI with up to 363.4 m 2 g −1 of Brunauer−Emmett−Teller surface, and the pore was filled with a quaternary ammonium salt containing long flexible alkyl chains, which produced an efficient means of OH − transport. The conductivity of the resulting polymer (QPDI-100) is reached as high as 205 mS cm −1 at 80 °C. The size stability was determined to be good at high conductance and swelling ratio is less than 15% at 80 °C. QPDI-a exhibited good stability under alkaline conditions, and 90% of the conductivity of QPDI-100 was retained after being immersed in 1 M NaOH solution at 60 °C for 40 days. The power density of H 2 −O 2 fuel cells at 60 °C was 437.7 mW cm −2 . The prepared intrinsic porous anion exchange membranes (AEMs) demonstrate potential for the development of anion exchange membrane fuel cells. This membrane design strategy paves the way for a new generation of AEMs for the purposes of electrochemical energy conversion and storage.

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An Overview of Commercial and Non‐commercial Anion Exchange Membranes

Zhang,

et al. 2024

Alkaline Anion Exchange Membranes for Fuel Cells

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High-performance tetracyclic aromatic anion exchange membranes containing twisted binaphthyl for fuel cells

Cited by 72 publications

References 69 publications

Effect of Hydrophobic Side Chain Length on Poly(carbazolyl terphenyl piperidinium) Anion Exchange Membranes

Effect of Hydrophobic Side Chain Length on Poly(carbazolyl terphenyl piperidinium) Anion Exchange Membranes

High Conductive Anion Exchange Membranes from All-Carbon Twisted Intrinsic Microporous Polymers

An Overview of Commercial and Non‐commercial Anion Exchange Membranes

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