JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Lingling Ma,Naeem Akhtar Qaisrani,Manzoor Hussain,Lv Li,Yabin Jia,Siyu Ma,Ruiting Zhou,Lei Bai,Gaohong He,Fengxiang Zhang
The anion exchange membranes (AEMs) with high hydroxide ion conductivity and stability are in an urgent need for alkaline membrane fuel cell applications . High ionic exchange capacity (IEC) is necessary to improve conductivity but detrimental to stability. In this work, a series of novel AEMs modified with bulky rigid β-cyclodextrin (CD) and long flexible multiple quaternary ammonium (MQ) are designed and prepared. The resulting AEM with a relatively low IEC of 1.50 mmol g -1 shows a good hydroxide ion conductivity of 112.4 mS cm -1 at 80 o C, whereas its counterpart without CD modification exhibits 83.0 mS cm -1 despite a similar IEC (1.60 mmol g -1 ); this is because the large CD units can impart high free volume to the membrane, reducing the ion transport resistance, and meanwhile, the hydrophilicity of CD’s external surface may promote formation of ion transport channels across the long flexible MQ cross-links. The CD modified AEM also imparts the membrane a better alkali- and swelling resistance as well as a higher tensile strength , without sacrificing its hydroxide ion conduction properties, than the un-modified membrane. The H 2 –O 2 fuel cell yields a high peak power density of 288 mW cm -2 at 60 o C. Our work implies that the CD enabled free volume strategy is effective to balance conductivity and stability, which may pave the way to fabrication of AEMs with further improved performance.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2017
·Vol. 164
·期 12
·F1051
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IF 3.259
Yifu Wang,Heting Wan,Jilin Wang,Lulu Wang,Ruijiang Feng
Self-assembly of Gemini surfactants (maleic alkylene group diethylbis [octyl dimethyl bromide], abbreviated as G16-2-16) were used to form reversed micelles by introducing sodium salicylate (NaSal) into chloroform solution of PSF (polysulfone). The rheological measurements indicated that micelles had been formed. The internal surface of micelles were full of orderly arranged quaternary ammonium (QA) groups as cationic active sites. Then we characterized the composite membranes which were introduced micelles, it turned out that, the OH− conductivity in presence of NaSal was higher than the absence one, indicating that the formation of reversed micelles arranged the cationic active sites more orderly, resulted in improving the anionic conductivity by 40–80%, especially under low values of water uptake and ion exchange capacity condition, which provided a kind of approach of enhancing OH− migration efficiency without sacrificing its dimensional stability and mechanical properties. The composite membranes also showed an outstanding thermal stability. And 240 h high temperature alkaline-stable test (10 M NaOH) revealed that the largest decline of OH− conductivity was only round about 4%, which showed excellent alkaline resistance stability.
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
INDUSTRIAL CROPS AND PRODUCTS
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2021
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IF 5.645
Ming Lei,Qingtong Zhang,Mingchao Chi,Yuanyuan Yu,Hongrui Jiang,Shuangfei Wang,Douyong Min
The Pinus contorta, Dougl. chip was ammonianized by 3-chloro-2-hydroxypropyltrimethyl ammonium chloride. Subsequently, the functionalized chip was thermally compressed under 30 MPa at 100 °C for 72 h to form the quaternary ammonia functionalized membrane (QAFW). The results revealed that the hydroxide ion conductivity and ion exchange capacity (IEC) of the as-fabricated membrane were up to 15.2 mS cm −1 and 1.86 mmolg −1 at 25 °C under 100 % relative humidity respectively, which is higher than most of the quaternary ammonia-functionalized aromatic polymer membranes. The ratio of hydroxide ion conductivity to methanol permeability of the optimized QAFW membrane is up to 3.86 × 10 3 S s cm −3 . The decomposition temperature of QAFW membrane is ∼ 252 °C. The tensile strength of the wet QAFW membrane is as high as 60.02 MPa, which is significantly higher than that of the aromatic polymer membranes. Conclusively, a novel method herein characterized with environmentally friendly and economically attractive for the anion exchange membranes fabrication was presented.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Shuhao Lin,Xin Liu,Kenan Xu,Kaiwen Wang,Nana Chang,Yixing Wang,Kang Huang,Weihong Xing,Zhi Xu
Alkaline zinc-based flow batteries (AZFBs) have emerged as a promising candidate for large-scale energy storage due to their low cost and high energy density. However, the pursuit of high power density in AZFBs has been hindered by the lack of ion conductive membranes (ICMs) capable of delivering high and stable ion conduction, a challenge that has yet to be fully addressed. Herein, we designed an innovative sulfonated hollow carbon sphere (SHCS)-embedded ICM designed specifically for AZFBs. By combining a hydrophilic polymer with SHCS, the membrane achieved exceptional ion conductivity through dual ion conduction channels. The sulfonic acid groups on SHCS and the polymer side chains created interconnected water networks, enabling efficient ion transport. Additionally, hollow structure and alkali resistance of SHCS provided stable ion pathways. As a result, the proposed membrane exhibited a superior OH − conductivity of 10.28 mS cm −1 , surpassing the pure polymer membrane (4.69 mS cm −1 ). In AZFB tests, it achieved an 88.9 % voltage efficiency at 80 mA cm −2 and operated for over 1570 cycles (1130 h). This work offers a breakthrough in designing high-performance ICMs, advancing high power density AZFBs for energy storage.
研究领域:
材料科学
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能源存储技术
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产品关联
DOI
高影响因子
IONICS
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2023
·Vol. 29
·期 12
·5383-5396
·
IF 2.8
Xu Guoyang,Zhou Weiyang,Jiang Yingshan,Zhang Qingshi,Li Xiangdan,Zhang Aiqing
A series of gemini cationic fluorinated poly(aryl ether) anion exchange membranes (AEMs) with different photocrosslinking degrees were prepared. The AEMs with photosensitive structures can photocrosslink under UV irritation at room temperature in the swollen state. Atom force microscope (AFM) experiment confirmed that the membranes had obvious hydrophilic/hydrophobic microphase separation structure. The ion exchange capacities (IEC), water uptake, swelling rate, ionic conductivity, mechanical properties, and thermal stability of the membranes were also investigated. The IECs were in the range of 2.05–2.16 meq/g, but AEMs showed reasonable water uptakes and swelling ratio were 39.67 and 14.47% at 80 °C, respectively, due to the introduction of fluorine atoms. The crosslinked membranes still exhibited satisfying hydroxide conductivity with a maximum value of 133.44 mS/cm at 80 °C. It can be attributed to the formation of hydrophilic/hydrophobic microphase separation structure within the membrane and the development of a tremendous number of ion transport channels. The conductivity only decreased by 6.3% correspondingly after in 1 M NaOH at 60 °C for 7 days; indicating membranes have good alkaline stability.
研究领域:
材料科学
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高分子科学
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电化学
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能源技术
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DOI
高影响因子
ACS Applied Energy Materials
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2021
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IF 6.024
Tuo Zhao,Chuan Long,Zhiqian Wang,Hong Zhu
As a key component of anion exchange membrane fuel cells (AEMFCs), anion exchange membranes (AEMs) have been investigated in the last decades. Herein, a series of multication cross-linkers were introduced into side-chain-type poly(p-terphenyl isatin) to develop high-performance and long-term stable AEMs. Additionally, the effects of the hydrophilic cross-linker length on the membrane performance were systematically investigated. The resulting cross-linked membranes possess a low swelling ratio (<18% at 80 °C) and high tensile strength (51.1–58.3 MPa). Notably, the cross-linker length influences the AEM internal morphology. With hexyl as the spacer between backbones and cation groups in the cross-linker, 0.9q-PTI-6C exhibits the highest hydroxide ion conductivity of 118.5 mS/cm at 80 °C, which is ascribed to well-developed ion channels. Furthermore, alkyl spacer chains and cross-linked networks contribute to the excellent alkali stability of membranes. After immersion in 2 M NaOH for 1200 h at 80 °C, 0.9q-PTI-8C only shows 11 and 12.7% losses in ion conductivity and ion exchange capacity (IEC), respectively. The fuel cell fabricated using 0.9q-PTI-6C can achieve the maximum power density of 310 mW/cm2 at 80 °C.
研究领域:
材料科学
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化学工程
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能源技术
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2018
·
IF 6.578
Yuqian Sui,Huayuan Hu,Mitsuru Ueda,Lianjun Wang,Xuan Zhang
In this study, a novel poly[vinyl-(4-benzyl- N , N , N -trimethylammonium bromide) ketone] (QA-PVBK) homopolymer was synthesized by conventional free-radical polymerization, followed by benzyl bromination, and in-situ quaternization reaction, successively. Blend membranes were further constructed between QA-PVBK and commercially available polybenzimidazole (PBI), as novel anion exchange membrane materials. Owing to the short repeating unit of QA-PVBK, the ion-clusters for the ion transport were highly aggregated on the microscale, which significantly contributed to the excellent hydroxide conductivity of the blend membranes. The PBI was introduced as a physical reinforcement, strengthening the membranes’ robustness and suppressing excessive swelling. Membrane PBI/QA-PVBK-OH(70%), with the QA-PVBK-OH (hydroxide form) content of 70% over the entire membrane matrix, exhibited a high hydroxide conductivity of 50.8 mS cm −1 at 60 °C, and, consequently, a good peak power density of 170.6 mW cm −2 at 60 °C/100% relative humidity condition in a H 2 /O 2 single cell test. The blend membranes also demonstrated acceptable chemical stability towards the alkaline condition (1 M NaOH at 60 °C) with the residual conductivity over 59.4% after 168 h. In light of these promising results, the present study demonstrates a facile blending process for simultaneously addressing the ion conductivity and mechanical properties of anion exchange membranes.
研究领域:
材料科学
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电化学
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高分子化学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2024
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IF 5.5
Zhiyan Sui,Zhe Wang,Song Wang,Yan Wang
Appropriate addition of cation transport sites while maintaining the good mechanical properties of anion exchange membranes (AEMs) can effectively improve the hydroxide ion conductivity. Therefore, a series of poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) based side-chain type AEMs containing dual conduction sites are successfully prepared. The 4-(4-dimethylaminostyryl)-1-methylpyridinium (DASP) side chains are grafted to brominated PPO at different ratios, which is confirmed by Fourier transform infrared spectroscopy (FT-IR). Analysis of the microscopic morphology reveals a distinct microscopic separation pattern of hydrophilic/hydrophobic regions, which provides efficient channels for the transport of hydroxide ions. The ionic conductivity of the PPO-DASP13 membrane reaches 89.97 mS/cm at 80 °C, which is benefited from the double cationic groups contained in the side chains, providing more conduction sites for hydroxide ions. Meanwhile, the tensile strength of membranes range from 17.83 MPa to 29.38 MPa, which have good mechanical properties. The ionic conductivity of all membranes retain about 70 % after a 800 h long-term alkali resistance test, which is related to the steric hindrance contained in the side chain structure and the conjugated system. Furthermore, the single cell based on PPO-DASP13 membrane with the highest ionic conductivity achieves a peak power density of 347.7 mW/cm 2 in H 2 -air (CO 2 -free) at 60 °C.
研究领域:
材料科学
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电化学
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高分子化学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2025
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IF 5.4
Qian Lu,Xinyi Wan,Yujie Hou,Yuli Zhang,Zhiliang Guo,Yifan Zhang,Changgan Lai,Lixu Lei
We have proposed a cost-effective method to make a membrane for alkaline water electrolysis by combining organic polymers with inorganic materials, to achieve high ionic conductivity, excellent alkaline stability, and superior electrochemical properties. In this study, NiFe layered double hydroxide (LDH) powders synthesized hydrothermally, mixed with 2 wt% ZrO 2 are physically crosslinked with polyvinyl alcohol (PVA) gel to form a ZrO 2 /NiFe-LDH@PVA slurry. The slurry has been coated onto a non-woven fabric to reduce being oxidated by the anodic active substances during the electrolysis process, also, a layer of nylon gauze is sandwiched to improve its mechanical properties. The resulted membrane exhibited exceptional mechanical strength (24.9 MPa tensile strength) and remarkable hydroxide ion conductivity (86.52 mS cm −1 at 90 °C). Furthermore, NiCo/NM and NiFe/NM catalysts were electrodeposited and integrated with the ZrO 2 /LDH@PVA composite membrane to assemble an alkaline water electrolysis device. When tested in 6 M KOH electrolyte at 70 °C and 2.0 V, the device achieved a current density of 781 mA cm −2 and maintained stable operation for at least 400 h.
研究领域:
材料科学
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电化学
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能源技术
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纳米技术
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高分子科学
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）