Materials Today Chemistry
·
2025
·
IF 6.7
Wei Fan,Litao Tian,Jingmei Xu,Kuirong Feng,Zhizhuo Liu,Ruonan Zhao,Ziyi Wang,Jiaxin Li
Efficient proton transport is crucial for proton exchange membranes (PEMs) in the development process of fuel cells. In this work, adenine-modified graphene oxide was successfully synthesized (AGO) and then introduced as the filler into the sulfonated poly (aryl ether ketone sulfone) containing carboxyl groups (C-SPAEKS) polymer matrix for the preparation of composite PEMs. The highly hydrophilic groups (Carboxy and hydroxy groups) on the surface of graphene oxide nanosheets and N heterocycles of adenine play a synergistic enhancement role in providing proton transport sites and constructing proton transport channels. The C-SPAEKS-0.5 %-AGO composite membrane which means the AGO content was 0.5 wt% had the highest proton conductivity of 201.54 mS cm −1 at 90°C and a tensile strength of 43.93 MPa. In addition, the current density of 2005 mA cm −2 corresponded to a peak density of 791.53 mW cm −2 of C-SPAEKS-0.5 %-AGO, which was 3.4 times of that of the pure membrane (231.83 mW cm −2 ). The results showed that the adenine-modified graphene oxide significantly improves the electrochemical performance of the PEMs.
研究领域:
材料科学
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化学工程
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电化学
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纳米技术
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Xueyan Wang,Mingshi Jin,Yuxiao Li,Lianhua Zhao
Anhydrous proton conducting membranes made of different ionic liquids (ILs), sulfonated poly (ether ether ketone) (SPEEK), and mesoporous silica (SiO 2 ) are successfully prepared. Influences of different ionic liquids on the properties of composite membranes doped with 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF 4 ]), 1-butyl-3-methylimidazolium trifluoromethanesulfonate ([BMIm][Tfo]), 1-butyl-3-methylimidazolium chloride ([BMIm]Cl), diethylmethylammonium trifluoromethanesulfonate ([dema][Tfo]), and 1-ethylimidazolium trifluoromethanesulfonate ([EIm][Tfo]) ionic liquids are described. Fourier transform infrared spectroscopy (FT-IR) analysis showed that there were interactions between ionic liquids, SPEEK and mesoporous silica. IL leaching studies demonstrated that IL loss decreased significantly after doping with SiO 2 . The proton conductivity study showed that both anions and cations of IL influenced the proton conductivity of the composite membranes. Proton conductivity of composite membranes displayed a positive correlation with the number of hopping sites within IL cation structures. Of all the conducting membranes studied, SP/SiO 2 -7.5/[BMIm][BF 4 ]-50 showed the highest anhydrous proton conducting ability (15 mS cm −1 at 200 °C). Therefore, it is expected to find applications in proton exchange membrane fuel cells under medium temperature, anhydrous conditions.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
HIGH PERFORMANCE POLYMERS
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2020
·
IF 1.568
Hailin Yu,Yinghan Wang
Aldehyde terminated sulfonated poly (arylene ether sulfone) (SPAES-CHO) is prepared by a series of nucleophilic substitution reaction based on SPAES in this paper. Novel SPAES-graft-SPVA (SPAES-g-SPVA) membranes are fabricated by acetal reaction between SPAES-CHO and different amounts of sulfonated poly (vinyl alcohol) (SPVA). The 1H-NMR and FTIR indicate the successful preparation of SPAES-CHO and SPAES-g-SPVA membranes. With the introduction of SPVA, the SPAES-g-SPVA membranes have much lower methanol permeability than pure SPAES membrane and Nafion117 membrane. The methanol permeability coefficients of the SPAES-g-SPVA membranes decrease from 3.41 × 10−7 cm2 s−1 to 1.67 × 10−7 cm2 s−1 with the increase of SPVA content. And the proton conductivity of all the membranes is higher than 15 mS cm−1 at 25°C. Moreover, SPAES-g-SPVA membranes exhibit high proton selectivity. Especially, SPAES-g-SPVA-30% membrane has the highest proton selectivity, which is nearly five times higher than Nafion117.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
International Journal of Polymer Science
·
2024
·
IF 3.4
Shuangjie Liu,Jialin Yu,Yongping Hao,Feng Gao,Mo Zhou,Lijun Zhao
Using Nafion212 membrane and TEOS solution as raw materials, Nafion212/SiO2 composite membranes were prepared. In the in situ sol-gel reaction process, a series of Nafion/SiO2 composite membranes were prepared by varying the reaction temperature and reaction time. The effects of different modification schemes on Nafion/SiO2 composite membranes were studied using SEM, EDS, TEM, TGA, XRD, and mechanical tensile experiments, among other methods. The results show that Nafion/SiO2 composite membranes prepared at 3°C exhibit a well-separated phase structure and excellent water retention properties, with a water uptake of 29.23% and a swelling ratio of 24.25%. These membranes also demonstrate outstanding physical and chemical performance, with a maximum tensile stress of 13.6 MPa and an elongation at a break of 270%. At 110°C, the proton conductivity of the Nafion/SiO2 composite membrane reaches 0.172 S/cm, meeting the requirements for high-temperature proton exchange membrane fuel cells.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Shiju Cai,Chenyi Wang,Zhengwang Tao,Jiafeng Qian,Xiaoyan Zhao,Jian Li,Qiang Ren
Due to further increase the performance of aromatic sulfonated proton exchange membrane (PEM) and make it play a better role in vanadium redox flow battery (VRFB), a series of poly(aryl ether sulfone)s containing eight alkyl sulfide sulfonated side chains (8SPAES-xx) are designed and synthesized. Their molecular structure, phase morphology and some selective properties were investigated in detail, respectively. It is confirmed that 8SPAES-xx membranes have clear hydrophilic/hydrophobic phase separation morphology. These membranes with the ion exchange capacity values of 1.08–1.61 mmol/g exhibit excellent ionic conductivity as well as moderate water uptake and good dimensional stability, and their values are in the range of 25–96 mS/cm, 8–28% and 5–17% at 30 °C, respectively. Among them, the proton conductivity of 8SPAES-12 membrane is 82 mS/cm at 30 °C, which exceeds the ionic conductivity of Nafion 117 (79 mS/cm). The membrane also shows high ion selectivity and excellent battery performance. At current density of 60 mA/cm 2 , the highest energy efficiency of VRFB with 8SPAES-12 membrane is 87.3%, which is higher than that of Nafion 117 (83.8%). Furthermore, the efficiency of VRFB with 8SPAES-12 membrane remains good cycle stability.
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 POWER SOURCES
·
2014
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IF 5.211
Hailong Cheng,Jingmei Xu,Li Ma,Lishuang Xu,Baijun Liu,Zhe Wang,Huixuan Zhang
A series of novel sulfonated poly(arylene ether ketone) (SPAEK) copolymers with pendant sulfoalkyl groups are prepared via nucleophilic polycondensation reactions. The sulfonate content of the SPAEK copolymers can be controlled easily by adjusting the ratio of the sulfonated and unsulfonated monomer feeds. The structures of the synthesized sulfonated copolymers are confirmed by 1 H NMR and Fourier transform infrared spectra. The microstructures of the membranes are investigated by transmission electron microscopy . Mechanical properties , thermal and oxidative stabilities , water uptake, swelling ratio, proton conductivity , and methanol permeability of the membranes are systematically investigated. The results demonstrated that the membranes have good performance. The proton conductivities of the side-chain-type SPAEK-100 membrane reach 0.051 and 0.152 S cm −1 at 25 and 120 °C, respectively. The methanol permeabilities of the side-chain-type SPAEK membranes are in the range of 0.12 × 10 −7 –3.55 × 10 −7 m 2 s −1 , which is lower than that of the Nafion 117 membrane, i.e., 23.8 × 10 −7 m 2 s −1 . A higher relative selectivity than that of Nafion 117 is also observed. These results indicate that there is a great potential for side-chain-type SPAEK membranes to be used in proton exchange membrane fuel cell applications .
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Liyuan Wang,Nanping Deng,Yueyao Liang,Jingge Ju,Bowen Cheng,Weimin Kang
In this study, a novel MOFs-anchored-nanofiber framework (UiO-66-NH 2 @NFs) is designed via electrospinning. To hybridize with Nafion matrix , UiO-66-NH 2 @NFs/Nafion membranes with acid-base pairs are fabricated. In the framework, sulfonated poly(ether sulfone) (SPES) nanofibers with effective –SO 3 H groups serve as bonding platforms and UiO-66-NH 2 with –NH 2 groups act as co-reinforcement units tethering in nanofibers. As systematically studied and compared in membrane performance , the homogeneous UiO-66-NH 2 @NFs/Nafion membrane with a moderate UiO-66-NH 2 filler amount of 8 wt% present excellent performance on elevating proton conductivity of 0.27 S cm −1 (80 °C, 100% RH) and inhibiting methanol permeability of 7.54 × 10 −7 cm 2 s −1 , respectively. The above superiorities can be attributed to the unique MOFs-anchored-nanofiber framework with balanced acid-base pairs. The interconnected UiO-66-NH 2 @NFs framework with hydrophilic SPES nanofibers and UiO-66-NH 2 offer consecutive proton transfer channels, making protons easily transfer via the hydration channels. Moreover, –NH 2 groups in UiO-66-NH 2 and –SO 3 H groups in matrix interact via acid-base pairs, which synergistically conducts protons via proton hopping channels in the membranes. Meanwhile, the good compatibility of UiO-66-NH 2 @NFs with Nafion matrix resulting from the tight electrostatically interactions between –NH 2 and –SO 3 H groups endow the hybrid membranes with suppressed methanol permeation and strengthened mechanical properties .
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 APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 26
·48830
·
IF 2.188
Gang Wang,Fei Wang,Anfeng Li,Miaomiao Zhang,Jie Zhang,Jinwei Chen,Ruilin Wang
The SPEEK/s-TiO 2 composite membrane was prepared by blending sulfonated poly(ether ether ketone) (SPEEK) and sulfonated titanium dioxide (s-TiO 2 ) nanoparticles. The important physiochemical parameters such as proton conductivity, water uptake, swelling degree and ion exchange capacity of the composite membrane were measured. The thermal stability and chemical stability were also tested. It was observed that the SPEEK/s-TiO 2 composite membrane exhibited the best selectivity (7.13 × 10 4 S·min·cm −3 ) accompanying high proton conductivity (0.061 S·cm −1 ) and low tetravalent vanadium ion (VO 2+ ) permeability (8.55 × 10 −7 cm 2 ·min −1 ) compared with Nafion117, SPEEK and SPEEK/TiO 2 membranes. The battery performance with these membranes was characterized by charge–discharge cycling tests and it was found that the SPEEK/s-TiO 2 composite membrane showed the highest energy efficiency (EE) up to 82.3%, indicating the SPEEK/s-TiO 2 composite membrane is a candidate for vanadium redox flow battery (VRFB) application. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48830.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Yiming Xiao,Qixuan Ma,Xiaoyu Shen,Songbo Wang,Jun Xiang,Lei Zhang,Penggao Cheng,Xinjun Du,Zhen Yin,Na Tang
Phosphoric acid (PA) doped polybenzimidazole (PBI) membrane has been regarded as one of most effective high temperature proton exchange membrane (HT-PEM). However, it has to face poor mechanical properties at high acid doping levels (ADLs) and significant acid loss at high temperature during the operation of fuel cell. Herein, we prepare cross-linked PBI membranes containing different contents of the cross-linker three-dimensional polyaniline (PANI) via a facile N-substitution reaction. The obtained cross-linked PBI membrane exhibits superior tensile strength , stability and proton conductivity . More importantly, robust mechanical strength and good acid retention of the PA-doped cross-linked PBI membrane are demonstrated even at high ADL (above 20). The cross-linked PANI-30%-g-OPBI membrane exhibits a high ADL of 22.9, high proton conductivity of 122.8 mS cm −1 at 160 °C. Furthermore, the peak power density reaches 447 mW cm −2 at 160 °C, which is 2.5 times than that based on the corresponding PBI membrane. Molecular dynamics simulation results indicate that the decreased mobility of polymer chains improve the mechanical properties of the cross-linked membranes, and the high intermolecular interaction energy of the aniline-biphosphate ion pair significantly decrease PA leaching in the membranes due to the introduction of 3D molecular structure of PANI.
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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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Hailan Han,Hai Qiang Li,Meiyu Liu,Lishuang Xu,Jingmei Xu,Shuang Wang,Hongzhe Ni,Zhe Wang
A series of novel organic-inorganic crosslinked hybrid proton exchange membranes were prepared using sulfonated poly(arylene ether ketone sulfone) polymers containing carboxyl groups (C-SPAEKS), (3-aminopropyl)-triethoxysilane (KH550), and tetraethoxysilane (TEOS). KH550 acted as a “bridge” after reacting with carboxyl and sulfonic groups of C-SPAEKS to form covalent and ionic crosslinked structure between the C-SPAEKS and SiO 2 phase. The crosslinked hybrid membranes (C-SPAEKS/K-SiO 2 ) were characterized by FT-IR spectroscopy, TGA , and electrochemistry , etc. The thermal stability, mechanical properties and proton conductivity of the crosslinked hybrid membranes were improved by the presence of both crosslinked structure and inorganic phase. The proton conductivity of C-SPAEKS/K-SiO 2 -8 was recorded as 0.110 S cm − 1 , higher than that of Nafion ® (0.028 S cm − 1 ) at 120 °C. Moreover, the methanol permeability of the C-SPAEKS/K-SiO 2 -8 was measured as 3.86 × 10 −7 cm 2 s − 1 , much lower than that of Nafion ® 117 membranes (29.4 × 10 −7 cm 2 s − 1 ) at 25 °C.
研究领域:
材料科学
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化学工程
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2011
·Vol. 121
·期 2
·1166-1175
·
IF 1.24
Shufang Liu,Yiwang Chen,Xiaohui He,Lie Chen,Weihua Zhou
The graft copolymer poly(butoxymethylene norbornene- co -norbornenemethylene bromoisobutyrylate) [P(BN/NB)]- graft -poly(hydroxyethyl methacrylate) (PHEMA) was synthesized by the atom transfer radical polymerization of 2-hydroxyethyl methacrylate from a copolymer prepared by two functional norbornene monomers via a vinyl addition mechanism. The graft copolymer P(BN/NB)- g -PHEMA was further crosslinked with 4,5-imidazole dicarboxylic acid (IDA) and then doped with phosphoric acid (H 3 PO 4 ) to form imidazole–H 3 PO 4 complexes. The results show that the polynorbornene backbone and crosslinked micromorphology produced low methanol permeability in the membranes (from 1.5 × 10 −7 to 3.8 × 10 −6 cm 2 /s) and endowed the membranes with good mechanical properties (with elastic modulus values of 692.7 to 159.7 MPa, elongation at break values from 2.7 to 22.7%, and tensile strength at break values from 14.4 to 5.5 MPa) and excellent thermal stability (up to 280°C). Furthermore, the proton conductivities of the membranes increased with increasing temperature and increasing content of IDA/H 3 PO 4 in the membranes. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Li Huiting,Long Jun,Huang Wenheng,Liu Xiyang,Li Jinchao,Chen Liang,Chen Qin,Liang Qianqian,Chen Jijun,Zhang Yaping
The polybenzimidazole membrane has a low proton conductivity, and its trade-off effect between proton conductivity and vanadium ions blocking has not been addressed. Therefore, improving the proton conductivity and proton selectivity of polybenzimidazole membrane is crucial for its development in vanadium flow battery (VFB). In this work, two types of sulfonated polybenzimidazole (SPBI and HSPBI) membranes with flexible sulfoalkyl pendants are prepared by ring-opening and substitution reactions for application in VFBs. Compared with poly(4,4′-diphenylether-5,5′-bibenzimidazole) (OPBI) membrane, SPBI and HSPBI membranes exhibit remarkable proton conductivities. However, the vanadium ions blocking capabilities of SPBI and HSPBI membranes show a slight decline. Excitingly, the HSPBI membrane achieves the highest proton selectivity (1.54 × 10 6 S min cm −3 ) compared with OPBI (6.28 × 10 5 S min cm −3 ), SPBI (1.30 × 10 6 S min cm −3 ) and commercial Nafion 212 (0.43 × 10 5 S min cm −3 ) membranes. Lastly, all membranes are separately assembled into VFBs to verify their battery performances. The HSPBI membrane shows higher Coulomb efficiencies (94.74–99.41%) and energy efficiencies (67.49–83.55%) compared of OPBI, SPBI and Nafion 212 membranes at 80–280 mA cm −2 . Remarkably, the 500 VFB cycles of HSPBI membrane at 140 mA cm −2 are also stably executed, which shows excellent structural stability. Therefore, the HSPBI membrane has a promising potential for VFB application.
研究领域:
储能
·
高分子科学
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电化学
·
膜技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）