JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Ying Jie Liu,Wei Ting Gao,Ai Mei Zhu,Qiu Gen Zhang,Qing Lin Liu
Anion exchange membranes (AEMs) are the core component of anion exchange membrane fuel cells (AEMFCs), among which poly(aryl piperidinium) (PAP) based AEMs have been studied. Herein, we report some scalable di-piperidinium cationic crosslinkers to enhance the mechanical properties , ionic conductivity and alkaline stability of PAP-based AEMs. The results show that the morphology of AEMs can be affected by adjusting the length of crosslinker. PTP-DPC/C6-50% shows a high OH − conductivity (80 °C, 131.2 mS cm −1 ) due to its microphase separation . It also has excellent elongation at break (20.8%) and tensile strength (36.5 MPa). The peak power density of the PTP-DPC/C6-50% based cell can reach 616.2 mW cm −2 under H 2 –O 2 conditions. The crosslinked network formed by long alkyl spacer chains is helpful to improve the alkaline stability of the AEM. After alkaline stability test, the conductivity of the PTP-DPC/C10-50% membrane maintained at 92.2%.
研究领域:
材料科学
·
燃料电池技术
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Faizal Soyekwo,Changkun Liu,Xin Mao,Ruixin Nie
Efficient magnesium-lithium separation is key to extracting lithium resources from salt lake brines. However, efficient magnesium-lithium separation is constrained by the high magnesium-to-lithium ratios on the nanofiltration separation performance due to the weakened Donnan effect and inherent permeability-selectivity trade-off behaviour. To address this challenge, a dual methylpiperidinium ionic liquid was designed in this work and incorporated into polyamide networks to manipulate the structural properties of polyamide membrane for improved magnesium/lithium separation. We demonstrate that the piperidinium modification of polyamide networks not only modulated and enhanced the morphology, hydrophilicity , free volume and electropositivity, but also synergized the steric hindrance differentiation inside the membrane nanochannels . These structural advantages enabled the modified membrane to achieve high-separation performance with enhanced water permeance of 37.3 L m −2 h −1 bar −1 and Mg 2+ /Li + selectivity of 30.6 (for Mg/Li mass ratio of 31.2). Molecular dynamics simulations further confirmed that the fast water transport and the difference in the ion separation behaviour are strongly correlated to the enhanced structural properties of membranes. We expect this work to provide insightful guidance for engineering high-performance membranes and make contributions in the application of nanofiltration in lithium mining from high Mg/Li ratio brines.
研究领域:
材料科学
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环境工程
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化学工程
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DOI
高影响因子
RENEWABLE ENERGY
·
2024
·
IF 9
Xianfeng Guan,Di Yu,Yu Luo,Shuyu Zhang,Wanzhen Wu,Xu Feng,Tongtong Gao,Wenyu Bai,Shuang Wang
Amino-type polybenzimidazole is prepared, then ionic liquid with three nitrogen positive sites ([CTDTr]Br 3 ) is polymerized into polymeric ionic liquids (PILs) by in-situ radical polymerization, and AmPBI-CTDTr-P x membranes were prepared by piperidinium (PPd) and [CTDTr]Br 3 combination to cross-linked with AmPBI. Following treatment with KOH and phosphoric acid (PA), the ion pairs (N + - H 2 PO 4 − ) generated in the composite membrane system can enhance proton conductivity and facilitate proton transport. The AmPBI-CTDTr-P x membranes shown exceptional PA retention as a result of the alkaline properties of both [CTDTr]Br 3 and PPd, which can engage in acid-base interactions with phosphoric acid. Specifically, the proton conductivity of AmPBI-CTDTr-P 5 at 180 °C is 129.7 mS cm −1 , which is 2.52 times that of pure membranes. Acid retention of AmPBI-CTDTr-P 5 at 80 °C/40 % RH and 160 °C are 64.4 % and 84 %.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Jian Gao,Jialin Zhao,Jingyi Wu,Yijia Lei,Na Li,Junjian Yu,Zhiyan Sui,Yan Wang,Jiayao Yang,Zhe Wang
The poly(aryl piperidinium) backbone has outstanding electrical conductivity and chemical stability, which is ideal for the preparation of anion exchange membranes (AEMs). Hence, in this research we prepared a series of high performance AEMs by introducing electron-rich dibenzothiophene (DBT) monomer into poly(aryl piperidinium) polymer backbone. The larger conjugated surface of the DBT monomer and the presence of heteroatoms facilitated intermolecular interactions between the polymers, which induced the generation of highly efficient ion-transport channels within the membranes, as evidenced by atomic force microscopy (AFM) images. The highest molar addition of DBT monomer, QPDBTTP-25 membrane, showed the highest conductivity (190.90 mS cm −1 at 80 °C) while maintaining robust dimensional stability (swelling ratio was 23.66 % at 80 °C). Owing to the advantages of the poly(aryl piperidinium) polymer backbone, the QPDBTTP-25 membrane also exhibited excellent mechanical properties (tensile strength of 53.03 MPa under fully hydrated condition) and durable chemical stability (conductivity retention remained at 93.2% after being immersed in 2 M NaOH solution at 80 °C for 1500 h). The H 2 /O 2 fuel cell test based on QPDBTTP-25 membrane resulted in a peak power density of 384 mW cm −2 at 80 °C.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Nanjun Chen,Chuanrui Lu,Yunxi Li,Chuan Long,Ziming Li,Hong Zhu
A practical polyelectrolyte system to improve the ion conductivity and lifetime of anion exchange membranes (AEMs) is a critical requirement for alkaline membrane fuel cells (AMFCs). Crosslinking is an effective approach to optimize the performance of AEMs. However, ordinary crosslinkers with a hydrophobic structure always make AEMs mechanically brittle. Herein, in response to the requirement of high-performance AEMs, a series of tunable multi-cation-crosslinked poly(biphenyl piperidinium) (PBP-xQ4) membranes were designed and prepared by embedding flexible cationic crosslinkers. The number of alkyl spacers between the cationic groups in the flexible crosslinkers were optimized to 5 and 6 to achieve optimum performance. These PBP-xQ4 membranes simultaneously have high ion conductivity (155 mS/cm at 80 °C) and good dimensional stability, and these membranes can be folded into many shapes. Besides, the crosslinking also promotes the alkaline stability of these membranes in 2 M NaOH at 80 °C: only a slight degradation is detected by 1 HNMR after alkaline treatment for1800 h. All these impressive results in ion conductivity and durability are attributed to clear nanophase separation in PBP-xQ4 membranes. Moreover, the PBP-xQ4 membrane realizes a maximum power density of 234 mW/cm 2 at 80 °C.
研究领域:
材料科学
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燃料电池技术
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Xinming Du,Zhe Wang,Hongyu Zhang,Yongjiang Yuan,Hui Wang,Zhenguo Zhang
The diffusion dialysis (DD) process based on AEM is considered for the acid recovery from acid effluents. In this work, the novel self-organized nanostructured cross-linked AEMs based on poly (aryl piperidinium) are synthesized for acid recovery. The cross-linked AEMs are designed by introducing 2-bromoethanol and 1,6-dibromohexane into the hydrophobic poly (biphenyl piperidine)s backbone via Menshutkin reaction, and the self-assembled nanostructure is confirmed by TEM imagines. The acid flux is improved by constructing a micro-phase separation structure and hydrogen bond network. The H-bond networks and cross-linking structure improve the selectivity between the acid and salt system without sacrificing IEC values of AEM. The IEC values of PBP-OH-x AEMs are in the range of 2.18–2.21 mmol/g. The AEMs exhibit high H + dialysis coefficients (U H ), ranging from 0.045 to 0.053 m/h, and have good separation factors (S) in the range of 32–56. The prepared PBP-OH-x AEMs have better DD performance, comparing with the commercial membrane DF-120 (U H = 0.009 m/h, S = 18.5). The novel AEMs based on poly (aryl piperidinium) showed the potential to be used in acid recovery via DD.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
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IF 8.3
Xinyi Liu,Yun Zhao,Zhiwei Ren,Yangkai Han,Tao Wei,Haitao Zhang,Jun Chi,Junling Ma,Zhigang Shao
Hydroxide exchange membrane water electrolysis (HEMWE) is garnering significant attention for large-scale green hydrogen production, owing to high operating current density and low capital cost. Hydroxide exchange membrane (HEM), a key component of the membrane electrode assembly (MEA), has been pursuing on improving its conductivity and dimensional stability for past several years. In this study, we develop a robust poly (ether-ether-ketone) (PEEK)-reinforced poly (aryl piperidinium) (TP-100) composite HEM (TP-100-PEEK) by a simple casting method. TP-100-PEEK shows excellent dimensional stability, good mechanical property and modest hydroxide conductivity. We also demonstrate a high-performance and durable HEMWE with the prepared TP-100-PEEK, achieving a high current density up to 3.5 A cm −2 at 2 V and over 1600 h long-term operation with a low decay rate of 51 μV h −1 at 1 A cm −2 . These results indicate that TP-100-PEEK has a significant potential for HEMWEs.
研究领域:
材料科学
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能源工程
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2020
·
IF 7.183
Bin Shen,Balakondareddy Sana,Hongting Pu
To meet highly conductive and chemical stable anion exchange membranes (AEMs), a series of multi-block poly(ether sulfone)s with long side chains densely terminated by piperidinium (bPES-Pip-X-Y) are synthesized. The multi-block structure and the aggregation of ionic groups on the flexible side chains are responsible for the distinct hydrophilic/hydrophobic microphase separation , which can be observed via transmission electron microscopy (TEM). The resulted membranes achieve the high conductivity (in-plane) of 48.5–105.4 mS cm −1 at 80 °C. Moreover, the AEMs prepared exhibit good alkaline stability due to the presence of cation-terminated long side chain structure. The bPES-Pip-10-5 membrane still maintains 88% of the original conductivity after treated in 1 M KOH solution at 60 °C for 336 h. The membrane electrode assembly based on bPES-Pip-10-5 with a power density of 136.9 mW cm −2 at a current density of 292.5 mA cm −2 is obtained.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Xue Cheng,Chunhu Li,Xiangwei Zou,Bo Sun,Liang Wang,Wentai Wang,Xiangchao Meng
Cross-linking represents a trenchant approach to coordinating the “trade-off” effect between ion conductivity and dimensional stability. Still, it is limited by the brittleness of materials caused by hydrophobic crosslinkers. We hereby introduced a hydrophilic alkoxy chain crosslinker containing dipolar molecules. The highly flexible C-O-C chain in the crosslinker allows for the formation of the hydrogen bond network, which amplifies the cation self-aggregation ability through Cation-Dipole interaction and constructs rational hydrophilic/hydrophobic microphase separation structures to establish a long-range ordered OH – pathway. Meanwhile, flexible crosslinkers suppressed swelling and enhanced flexibility. Among the alkoxy chain cross-linked poly (p-terphenyl piperidinium), QPTP-IEO 15 exhibited the optimal OH – conductivity of 148.5 mS cm −1 at 80℃. Moreover, the QPTP-IEO 15 membrane demonstrated remarkable alkaline stability while maintaining a low swelling ratio (15.0 % at 80℃) and adequate mechanical strength: ion conductivity and ion exchange capacity only deteriorated by 3.3 % and 2.9 % after soaking in a 1 M KOH solution (80℃) for 1200 h, respectively. Additionally, Anion exchange membrane water electrolysis based on QPTP-IEO 15 -MEA achieved a current density of 1800 mA cm −2 at 3.11 V.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Jie Liu,Li Gao,Mengting Di,Lei Hu,Xiaojun Sun,Xuemei Wu,Xiaobin Jiang,Yan Dai,Xiaoming Yan,Gaohong He
The cheap, highly-conductive and alkali-resistant anion exchange membrane is crucial for fuel cell. In this work, poly (ether phenylene piperidinium)-based membranes are prepared through the polymerization of diphenyl ether , N-methyl-4-piperidone and methyl 2-oxopropionate or 2,2,2-trifluoroacetophenone under super acid catalysis . These polymers are much cheaper than other reported piperidiniums due to the low cost of diphenyl ether as well as the reduced super acid catalyst dosage originating from the enhanced reactive activity. The performances are better for the membrane from 2,2,2-trifluoroacetophenone than from methyl 2-oxopropionate. The membrane shows the highest conductivity of 88 mS cm −1 and good alkaline stability of >1000 h. Having good solubility in low boiling point solvent (acetone/water), the poly (ether phenylene piperidinium) is a suitable material for the AEMs and ionomer . The single cell employing poly (ether phenylene piperidinium) as both membrane and ionomer exhibits the highest peak power density of 506 mW cm −2 . The results indicate that poly (ether phenylene piperidinium) membrane is promising for fuel cell.
研究领域:
材料科学
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化学工程
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能源科学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Jiandang Xue,John C. Douglin,Tong Huang,Haifei Jiang,Junfeng Zhang,Yan Yin,Dario R. Dekel,Michael D. Guiver
Poly(arylene piperidinium) (PAP) anion-exchange membranes (AEMs) are attractive platform materials currently used for anion-exchange membrane fuel cells (AEMFCs) and chain branching modifications on PAP polymer structures have recently drawn much attention for effectively regulating the membrane properties. To better understand the influence and interplay of the polymer chain entanglement and free-volume effect from various branched architectures, herein, lightly end-branched EB-PTP/TPB AEMs, using poly( p -terphenyl dimethylpiperidinium) (PTP) as the polymer backbone and bulky rigid 1,3,5-triphenylbenzene (TPB) as the branching agent, are designed and compared to previously reported random-branched RB-PTP/TPB and linear-chain PTP membranes. Intrinsic viscosity, bulk density and positron annihilation lifetime spectroscopy suggest a lesser extent of chain entanglement, but more evident free-volume elements for end-branched EB-PTP/TPB, particularly for higher branched EB-PTP/TPB-1% containing 1 mol% of TPB branching agent, compared with the random-branched RB-PTP/TPB that exhibits a more predominant chain entanglement effect. EB-PTP/TPB AEMs with increased free volume exhibit faster water sorption kinetics and slightly higher ion conductivity, but the concurrent high water sorption levels are disadvantageous to high-temperature ion transport, alkaline stability and water balance management. Even so, EB-PTP/TPB AEMs still show sufficient mechanical robustness, restricted swelling and higher alkaline stability than linear-chain PTP membranes, aided by the considerable extent of chain entanglement. This work reveals branched architecture–AEM property relationships and provides valuable insights towards branched architecture design.
研究领域:
材料科学
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能源科学
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高分子化学
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产品关联
DOI
高影响因子
MOLECULES
·
2014
·Vol. 19
·期 12
·20157-20169
·
IF 2.095
Caili Dai,Mingyong Du,Yifei Liu,Shilu Wang,Jianhui Zhao,Ang Chen,Dongxu Peng,Mingwei Zhao
Micelles formed by the long-chain piperidinium ionic liquids (ILs)N-alkyl-N-methylpiperidinium bromide of general formula CnPDB (n= 12, 14, 16) in ethylammonium nitrate (EAN) were investigated through surface tension and dissipative particle dynamics (DPD) simulations. Through surface tension measurements, the critical micelle concentration (cmc), the effectiveness of surface tension reduction (Πcmc), the maximum excess surface concentration (Гmax) and the minimum area occupied per surfactant molecule (Amin) can be obtained. A series of thermodynamic parameters (ΔGm0,ΔHm0andΔSm0) of micellization can be calculated and the results showed that the micellization was entropy-driven. In addition, the DPD simulation was performed to simulate the whole aggregation process behavior to better reveal the micelle formation process.Keywords:aggregation behavior;long-chain piperidinium ionic liquid;surface tension;dissipative particle dynamics
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）