Sustainable Energy & Fuels
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2020
·Vol. 4
·期 8
·4057-4066
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IF 5.503
Xueqiang Gao,HongMei Yu,Feng Xie,Jinkai Hao,Zhigang Shao
Anion exchange membrane fuel cells (AEMFCs) have attracted growing interest in recent years due to the favored electrochemical kinetics of the oxygen reduction reaction (ORR) and potential low cost, and development of high performance AEMs is always an urgent issue. In this work, a series of cross-linked AEMs with different diamine cross-linkers and various degrees of crosslinking based on the aryl-ether free tri-block copolymer SEBS were prepared using an in situ crosslinking method. FT-IR, XRF and EDS spectra confirm the structures and the degree of crosslinking of the AEMs. Moreover, the cross-linked AEMs demonstrated good mechanical properties and dimensional stability; the tensile strength reached 18.43 MPa (ca. 4.5 times higher than that of the membrane without crosslinking), and the swelling ratios of the cross-linked AEMs were only ca. 10%, which meet the requirement of the AEMFC application. In addition, the cross-linked AEMs demonstrated high ionic conductivity at relatively low IECs and water uptake, and the results of SAXS and TEM verified that the high conductivity could be attributed to the good hydrophilic/hydrophobic phase separation microstructure. Furthermore, in the test of H2/O2 AEMFCs, the MEAs fabricated using the cross-linked membranes displayed good fuel cell performance, especially for the C4-CQASEBS membrane, and the fuel cell realized a peak power density of 585 mW cm−2 at 60 °C. The results indicated that the cross-linked AEMs based on SEBS are a promising candidate material for fuel cell application.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2019
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IF 7.015
Naeem Akhtar Qaisrani,Lingling Ma,Jiafei Liu,Manzoor Hussain,Lv Li,Panyue Li,Shoutao Gong,Fengxiang Zhang,Gaohong He
The anion exchange membranes (AEM) is one of the key components for alkaline electrolyte membrane fuel cells. However, poor alkaline stability and conductivity of the membrane greatly hinders its practical application. Herein, we report a novel 4-(dimethylamino)butyraldehyde diethyl acetal (DABDA) quaternized polysulfone AEM, or PSf-DABDA, which shows improved conductivity and alkaline stability due to the better hydrophilicity and the electron donating effect imparted by the long alkyl substituent with two ether-containing moieties in the cation structure. Its room temperature conductivity reaches 21 mS/cm while that of trimethylamine (TMA)- and dimethylbutylamine (DMBA) quaternized AEMs with comparable ion exchange capacity (IEC) is 11.8 and 13.2 mS/cm, respectively. When treated 150 h in 1 M NaOH at 60 °C, the PSf-DABDA membrane experiences a slight conductivity decrease of 5% while the PSf-TMA and PSf-DMBA membranes with a comparable IEC suffer a more serious conductivity decay of 19 and 13.5%, respectively. The better alkali stability of PSf-DABDA over its counterparts is further confirmed by a density functional theoretical study and a structural characterization before and after the alkali treatment. Our work demonstrates the advantage of the DABDA cation by both experimental and computational study; it presents a new possibility of improving AEM conductivity and stability.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Naeem Akhtar Qaisrani,Lingling Ma,Manzoor Hussain,Jiafei Liu,Lv Li,Ruiting Zhou,Yabin Jia,Fengxiang Zhang,Gaohong He
Anion-exchange membranes (AEM) with high ion content usually suffer from excessive water absorption and dilution effects that impair conductivity and mechanical properties. We herein report a novel ether containing a cross-linking strategy without adopting high ion-exchange capacity (IEC). The ether-containing cross-links and the quaternized structure are created simultaneously by introducing an ether-containing flexible hydrophilic spacer between two 1,4-diazabicyclo[2,2,2,2]octane or DABCO molecules; the resultant bi-DABCO structure was further employed to react with chloromethylated polysulfone. The long spacer with the ether moiety may benefit the hydroxide ion transport, and the cross-links will control the swelling and water absorption of the AEM. The two ether groups in the long spacer of the cross-links will also shield the DABCO cation from OH– attack due to an electron-donating effect. The prepared membranes exhibited an improved conductivity of 31 mS/cm (at 25 °C) at a comparatively low IEC (1.08 mmol/g) with a rational water absorption and low swelling ratio (95.0 and 27.1%, respectively); they also displayed an enhanced alkaline stability in 1 M NaOH aqueous solution at 80 °C for 150 h. The density functional theory study and physical characterization after the alkaline treatment further confirm the better chemical stability of the cross-linked membrane over its counterpart. Our work presents an effective strategy to balance AEM conductivity and robustness.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Processes
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2021
·Vol. 9
·期 6
·1049
·
IF 2.847
Jinbei Yang,Guangkai Dai,Jing Wang,Shuai Pan,Gang Lu,Xiaoke Shi,Danni Tang,Jinyi Chen,Xiaocheng Lin
Diffusion dialysis (DD) employing anion exchange membranes (AEMs) presents an attractive opportunity for acid recovery from acidic wastewater. However, challenges exist to make highly acid permeable AEMs due to their low acid dialysis coefficient (Uacid). Here, a series of porous and highly acid permeable AEMs fabricated based on chloromethyl polyethersulfone (CMPES) porous membrane substrate with crosslinking and quaternization treatments is reported. Such porous AEMs show highUacidbecause of the large free volume as well as the significantly reduced ion transport resistance relative to the dense AEMs. Compared with the commercial dense DF-120 AEM, our optimal porous AEM show simultaneous 466.7% higherUacidand 75.7% higher acid/salt separation factor (Sacid/salt) when applied to acid recovery at the same condition. Further, considering the simple and efficient fabrication process as well as the low cost, our membranes show great prospects for practical acid recovery from industrial acidic wastewater.Keywords:anion exchange membrane;diffusion dialysis;acid recovery;porous membrane
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
DESALINATION
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2024
·
IF 8.3
Xuehui Ge,Huanhuan Zhang,Yafei Cheng,Haiyang Shao,Lei Yuan,Senbin Shen,Guixiang Wang,Chenxiao Jiang,Xiaocheng Lin
A green anion exchange membrane for electrodialysis desalination was synthesized using a solvent-free photo-polymerization approach. Vinylbenzyl chloride (monomer), tripropylene glycol diacrylate (crosslinker), and photoinitiator were mixed and subjected to UV polymerization for 20 min to create the base membrane, followed by positive charge modification with 1-methylimidazole. This method avoids organic solvents, offering economic and environmental benefits. By adjusting the degrees of crosslinking and positive charge, precise control over the membrane's microstructure and properties was achieved. The optimized membrane showed an area resistance of 1.67 Ω cm 2 and a transport number of 0.956, demonstrating exceptional electrochemical performance. Under comparable conditions, the optimized membrane improved the NaCl removal rate by 11.47 %, increased current efficiency by 10.61 %, and reduced energy consumption by 16.75 % compared to commercial AMV membrane, highlighting its potential for scalable seawater desalination through electrodialysis.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2019
·
IF 7.467
Qian Yang,Xue Lang Gao,Hong Yue Wu,Yuan Yuan Cai,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
Herein, a novel strategy to improve the performance of anion exchange membranes (AEMs) is adopted to build a crosslinked structure by tethering the rigid poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) backbone and the flexible poly(4-vinylphenol) (PVP) backbone using an oscillational chain. The incompatibility between the PPO and PVP backbones makes them self-aggregated resulting in occurrence of distinct microphase separation and development of ion transport channels in the AEMs to facilitate the transport of hydroxide ion. The microphase separation of the as-prepared AEMs has been revealed by transmission electron microscopy (TEM) and DI multimode atomic force microscopy (AFM). The existence of the hydrophilic PVP chain also ensures sufficient water uptake to enhance the conductivity of the AEMs. A maximum ionic conductivity of 134 mS cm −1 is achieved at 80 °C by the PPO-c-PVP-40% (40% is the molar content of PVP chains) membrane. A maximum power density of 173 mW cm −2 at 80 °C is obtained by a H 2 /O 2 single cell using the PPO-c-PVP-40% membrane electrode assembly . The PPO-c-PVP-40% membrane also exhibits robust alkaline stability (retains about 90% ionic conductivity after 480 h alkaline stability test) and excellent mechanical property. Those render the AEMs a potential membrane electrode material for fuel cell applications .
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2016
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IF 6.333
Ao Nan Lai,Dong Guo,Chen Xiao Lin,Qiu Gen Zhang,Ai Mei Zhu,Mei Ling Ye,Qing Lin Liu
Development of anion exchange membranes (AEMs) with high hydroxide conductivity, good dimensional and alkaline stabilities is still a challenge for the practical application of AEM fuel cells. In this study, we report a new strategy to prepare high-performance AEMs with crosslinked ionic regions. A series of phenolphthalein-containing poly(arylene ether sulfone)s crosslinked AEMs was synthesized by grafting ion groups selectively and densely on the phenolphthalein units to form ion clusters that are further crosslinked to generate the hydrophilic ionic regions. The crosslinking reaction not only improved the dimensional stability of the AEMs, but also increased the aggregation of the ion clusters leading to the formation of hydrophilic/hydrophobic phase-separated morphology and ion-conducting channels. As a result, enhancements in both ion conductivity and dimensional stability can be achieved. The crosslinked AEMs showed high hydroxide conductivities in the range of 52.2–143.4 mS cm −1 from 30 to 80 °C and a superb ratio of relative conductivity to relative swelling at 80 °C. Furthermore, the crosslinked AEMs also exhibited good mechanical properties , thermal and alkaline stabilities and desirable single cell performance. This work presents a promising strategy for the synthesis of high-performance AEMs for fuel cells.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2025
·
IF 7.9
Yu Chen,Zongxue Yu,Junlei Tang,Xiuzhu Zhang,Shijie Guo,Xunwang Tang,Zhiquan Chen,Yingqing Zhan
As one of the core components of anion exchange membrane water electrolyser (AEMWE), the performance of anion exchange membrane (AEM) has a direct impact on the application effect of the water electrolyzer. Chemical cross-linking method is an effective way to solve the problem of balancing membrane dimensional stability and ionic conductivity and improve mechanical properties. However, the crosslinked network brings hindrance to the ionic transport rate and causes the loss of ionic conductivity, having a direct impact on the application effect of water electrolysis. In this paper, a series of Poly(biphenyl-co-m-triphenyl-piperidine) (PBMP) based on composite AEMs are prepared by functionalized modification of MXene with high electrical conductivity as an inorganic cross-linking agent, and the electrical conductivity of MXene overcomes the hindrance of cross-linking on ion transport. Inorganic crosslinkers are classified into hexane hydrocarbon crosslinkers (6-NH 2 -Alk-Ti 3 C 2 T x ) and ethane hydrocarbon crosslinkers (2- NH 2 -Alk-Ti 3 C 2 T x ). The AEMs prepared with 2-NH 2 -Alk-Ti 3 C 2 T x crosslinker exhibit higher ionic conductivity (112.0 mS cm −1 ) due to a sharper microphase separation morphology. The presence of a crosslinked network within the membrane reduces the swelling ratio of the membrane (80 °C, 1.2 %) and improves the mechanical properties (from 29.2 MPa to 55.3 MPa). In addition, the AEMWE prepared by PBMP-0.46-2-NH 2 -Alk-Ti 3 C 2 T x (PBMP-0.46–2M) membrane reaches 760 mA cm −2 at 2.0 V, 70 °C in 1 M KOH solution. Therefore, it is feasible to realize AEMs prepared with functionalized MXene as crosslinker and filler for application in electrolysis cells.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Chengzhen Zhu,Junhua Li,Junbin Liao,Quan Chen,Yanqing Xu,Huimin Ruan,Jiangnan Shen
Electrodialysis (ED) technology equipped with proton blocking anion exchange membranes (AEMs) has great potential applications in recovering acidic wastewater. To develop high performance proton-blocking AEMs, in this work, a series of imidazolium functionalized poly(vinyl chloride) (PVC) AEMs are designed. In particular, the length of alkyl side chains tethered on the imidazole compound is optimized to adjust the micro-structure of AEM. Our research demonstrates that the density of 1-butylimidazole functionalized PVC AEM matrix is enhanced, which has been proved by water uptake and thermogravimetric analysis . Hence, the acid blocking performance of optimized AEM (PVC-Im-4C) is strengthened. The maximum concentration of H + in concentrate chamber of electrodialyser enriched by the PVC-Im-4C AEM is 1.81 M through the 24 h ED process at a current density of 20 mA·cm −2 (the initial concentration of hydrogen ions: 1.0 M). The result suggests that the optimized PVC-Im-4C AEM with long alkyl side chain on imidazole shows the excellent capacity in acid enrichment. This work should provide guidance for the follow-up design of the advanced proton blocking AEMs.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
·
IF 8.4
Xinli Zhang,Shoutao Gong,Long Han,Quan Jin,Xiaoming Yan,Gaohong He,Fengxiang Zhang
Polyarylpiperidinium anion exchange membranes (AEMs) have been widely studied in anion exchange membrane fuel cells and alkaline electrolyzed water due to their excellent alkali resistance stability. In this work, we report the design and fabrication of poly(p-triphenylene-piperidinyl) (PTP) AEMs quaternized and cross-linked by bromo-β-cyclodextrin (β-CD-Br 7 ). In this type of membranes, the densely cross-linked and quaternized sites derived from β-CD-Br 7 can help to construct continuous ion transport channels to facilitate ion conduction. Although the ion exchange capacity (IEC) tended to decrease with increasing cross-linking degree, the qPTP-CD 5 membrane with 5 % cross-linking (IEC = 2.3 mmol g −1 ) produced the most significant microphase separation and the highest conductivity (125.6 mS cm −1 at 80 °C). The membrane also exhibited impressive alkaline stability, with 94.6 % conductivity retention in 1 M NaOH at 80 °C after 1000 h and 90.7 % conductivity retention after 1500 h. Finally, the peak power density of the fuel cell assembled with qPTP-CD 5 membranes was 1.216 W cm −2 at 80 °C and there was no significant voltage degradation when operated at 200 mA cm −2 current density for 40 h. This work demonstrates that β-CD can function as a good “platform” for simultaneous cross-linking and quaternization to fabricate high performance AEM.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
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2024
·
IF 5.4
Ning Xie,Tao Wang,Haowei Kang,Yiting Liu,Xinli Li,Qiang Weng,Xingming Ning,Pei Chen,Xinbing Chen,Zhongwei An
High-performance anion exchange membranes (AEMs) have garnered increasing attention in recent years. However, commercial progress of the AEM for fuel cells is still hindered by its low ionic conductivity and inadequate alkaline stability. In this study, we propose the incorporation of a hydrophobic rigid-flexible coupled side chain into a polycarbazolyl AEM as an innovative approach to enhance both the conductivity and stability. The results demonstrate that the AEMs with hydrophobic rigid-flexible coupled side chains exhibit superior conductivity and stability compared with those without (PQMC-0). For example, the ion exchange capacity of PQMC-10 is reduced by 11% than PQMC-0, but its conductivity is enhanced by 14%, dimensional change is decreased by almost half, and oxidative stability is increased by more than four times. Improved conductivity of the AEMs can be attributed to the presence of hydrophobic rigid-flexible coupled side chains, making it easier for AEM to construct microphase separation to facilitate ion transport. Furthermore, the introduction of hydrophobic side chains reduces water absorption of the membrane, thereby enhancing its dimensional stability while minimizing the intake of free radicals or hydroxide ions present in water. Consequently, this modification significantly improves the oxidative and alkaline stability as well. Finally, the PQMC-10 shows a maximum power density of 649 mW cm–2 in a single fuel cell, which is three times bigger than that of PQMC-0, indicating a promising application in the field of fuel cells.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
·
IF 8.4
Dan Sun,Bing-Xin Gu,Hui-Qian Huo,Hao Wang,Yan-Li Ji,Cong-Jie Gao
The separation and removal of nutrient salts from wastewater can realize environmental remediation, and resource recycling and utilization. Electrodialysis (ED) membrane separation technology can offer an effective and low-energy consumption alternative but requires selective separation of nutrient salts with rapid anions permeation rate. We fabricated selective anion exchange membranes (PA-ATG) with the polyamide (PA) surface modification of commercial ATG anion exchange membrane by interfacial polymerization (IP) method. The dense PA thin-film layer with high hydrophilicity and electronegativity facilitates nitrate/phosphate anions selectively permeating through the PA-ATG membrane. The PA-ATG membrane exhibited a NO 3 − anion permeation rate of 1.1 mol m −2 h −1 and good NO 3 − /HxPO 4 (3−x)- permselectivity of 2.02, which is ∼2.0 times higher than that of the pristine ATG membrane. Owing to the rigid aromatic crosslinking structure, and electrostatic and hydrogen-bonding multiple interfacial interaction, the as-prepared membrane PA-ATG showed good stable and efficient separation performance during ED process for the nutrient wastewater treatment.
研究领域:
环境科学
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材料科学
✓ 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）