FUEL
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2024
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IF 6.7
Xiuzhu Zhang,Zongxue Yu,Junlei Tang,Jiaqiang Huang,Xunwang Tang,Bing Lin,Shuangshuang Xia
The improvement of ionic conductivity and alkali stability of anion exchange membranes(AEMs) has been the focus of research. The abundant functional groups on the surface of inorganic nanomaterials tend to form a rich hydrogen bonding network, which reduces the activation energy and improves the ionic conductivity. In this paper, the prepared HF-Ti 3 C 2 T x was used as a filler in a quaternized poly(aryl piperidinium) (QPAP) matrix to enhance the performance of the membrane electrode assembly of an anion exchange membrane water electrolyzers (AEMWE). With the addition of MXenes, the mechanical properties of the composite membrane improved significantly (from 12.13 MPa to 27.85 MPa). At 80 °C, the ionic conductivity of QPAP-HM-0.7 was as high as 159.4 mS cm −1 . The results showed that the functional groups on the surface of MXenes and the polymer matrix successfully constructed a hydrogen bonding network within the membrane, forming a hydrophilic and hydrophobic microphase separation structure. In addition, the composite membranes prepared by doping HF-Ti 3 C 2 T x obtained good alkali stability (conductivity retention of more than 85 % after 720 h immersion at 80 °C in 1 M NaOH) and dimensional stability, which proved that MXenes is an effective filler to improve the membrane properties.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Chenshi Shang,Ze Wang,Lulu Wang,Jilin Wang
A new type of symmetrical bis-crown ether is prepared by connecting dibenzo-18-crown-6 ether on both sides of the chromotropic acid , and then grafting the aforementioned bis-crown ether onto polyvinyl alcohol matrix to prepare a series of anion exchange membranes (AEMs), which their have high conductivity and strong alkali stability. These synthesized membranes were named B-C X% -P AEMs (x is the mass percentage of the symmetrical bis-crown ether (B–C)). Then, the chemical structure of aforementioned AEMs were verified by means of 1 H NMR, FT-IR and UV. Meanwhile, the OH − conductivity, alkaline stability and single cell performance of the synthesized membrane were also investigated. The results revealed that the conductivity of B–C 30% -P membrane is the highest at 80 °C (235 mS cm −1 ), and the power density is also the highest (197 mW cm −2 ), and the alkali stability of the membrane synthesized in this paper was also improved. The conductivity at 80 °C was only reduced by 4%, which was obtained by immersing the B–C 30% -P membrane immersed in 6 mol L −1 KOH solution for 168 h, which the aforementioned results proved that the synthesized membrane in this research had excellent OH − conductivity and alkaline stability.
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
RSC Advances
·
2016
·Vol. 6
·期 37
·31336-31346
·
IF 3.289
Baoqiang Zhang,Lingdong Li,Gaohong He,Fangyuan Gai,Fengxiang Zhang
The alkaline electrolyte membrane (AEM) is one of the key materials for alkaline electrolyte membrane fuel cells. While most studies focus on AEM performance in relation to cation structure, ion exchange capacity (IEC) and membrane architecture (cross-linking, composite, microphase separation), herein we report that AEMs of varied backbone structures and comparable IEC show remarkably different conductivities and alkaline stability. In particular, the AEM of imidazolium functionalized, isopropylene-containing polysulfone exhibits higher conductivity, but lower swelling- and alkali tolerance than those without such a unit. To confirm and mitigate the backbone influence, we grafted the isopropylene-containing polysulfone with imidazolium functionalized side chains. The resulting grafted membrane shows conductivity of 64 mS cm−1 at 80 °C, which is higher than that of the un-grafted AEMs; its stability against water swelling and hydroxide attack is also improved. Our study provides a new understanding on the structure–property correlation of AEMs, and thus is beneficial for designing high-performance electrolyte membranes for an alkaline fuel cell.
研究领域:
材料科学
·
燃料电池研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Minhui Liang,Jinwu Peng,Kaiyue Cao,Cengliang Shan,Zhenchao Liu,Peng Wang,Wei Hu,Baijun Liu
A bulky and hydrophilic β-cyclodextrin group, serving as a “performance assisting moiety”, was grafted onto a poly(phenylene oxide) (PPO) to achieve a new family of polymer electrolytes with different kinds of quaternary ammonium salts (QAs) for anion exchange membranes (AEMs). It was observed that the β-cyclodextrin involved AEMs having a well-designed molecular architecture exhibited some attractive properties. At the same ion exchange capacity level, the highest conductivity at 80 °C of the cyclodextrin-involved anion exchange membranes reached 110.8 mS cm −1 , which was almost twice as high as that of a reference membrane. As a novel “assisting moiety”, the incorporation of the functional cyclodextrin groups also endowed membranes with suitable water uptakes of 60.2–93.8% and swelling ratios of 11.5–22.8% at 80 °C. A comparative study revealed that the cyclodextrin-involved membranes had an improved alkaline stability and a satisfactory cell performance. The maximum power density of one cyclodextrin-based membrane was 154 mW cm −2 , which was three folds higher than that of the analogue without “assisting moiety”. In general, this study offers an effective synthetic strategy to prepare the high-performance anion exchange membranes with an excellent combination of high conductivity, low swelling, good alkaline stability and reasonable cell performance.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Wei Yuan,Lingping Zeng,Shangkun Jiang,Caili Yuan,Qian He,Jianchuan Wang,Qiang Liao,Zidong Wei
Anion exchange membrane fuel cells (AEMFCs) is a potential substitute to the prevailing proton exchange membrane fuel cells (PEMFCs), since non-precious metal catalysts can be applied in the AEMFCs, leading to much lower cost of it. However, anion exchange membranes (AEMs), as a crucial component of the AEMFCs, has always been a challenge in the commercialization of AEMFCs, such as poor life-time and conductivity . Herein, a series of poly(carbazolyl aryl piperidinium) AEMs and ionomers are prepared with non-rotatable rigid carbazole group next to piperidinium ring on the polymer backbone for the first time, and the membranes were fabricated by mass production method of tape-casting. The membranes exhibit extraordinary comprehensive performance, for instance, high hydroxide conductivity up to 204.8 mS cm −1 at 90 °C, good mechanical strength of >50 MPa in wet state, low hydrogen permeability and excellent alkaline stability of only 3% decline after 2100 h in 1 M KOH at 80 °C. Fuel cell (H 2 –O 2 ) based on the as-prepared membranes and ionomers shows outstanding peak power density of 1.72 W cm −2 at a quite low back pressure of 20 kPa, and only 2.6% decay was observed after 120 h.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Li Gao,Ying Wang,Chunyu Cui,Wenji Zheng,Xiaoming Yan,Peng Zhang,Lei Hu,Xuemei Wu,Lin Zhuang,Gaohong He
Developing anion exchange membranes (AEMs) having high hydroxide conductivity, swelling resistance and excellent alkaline stability is a challenge for fuel cells now. Herein, a universal and controllable approach of grafting rigid side chain is first proposed to construct connected ion transport nano-channels. A new route is also provided to prepare AEMs with stable symmetric saturated heterocyclic amomium. The rigid side chain is introduced onto poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) by the Friedel-Crafts acylation with 4-fluorobenzoyl chloride and subsequent reaction between phenyl fluoride and secondary amine of 1-methylpiperazine. Then the terminal piperazinium is produced by the reaction between tertiary amine of 1-methylpiperazine and methyl iodide. Rigid branches expand free volume to construct connected ion transport nano-channels, leading to excellent conductivity (108 mS cm −1 at 60 °C) that is higher than those of other reported symmetric heterocyclic amomium functionalized AEMs (33–89 mS cm −1 at 60 °C). Due to the high conductivity, the H 2 /O 2 cell employing this membrane achieves one of the highest peak power densities (1210 mW cm −2 at 2600 mA cm −2 ) so far. In addition, the IEC of the membrane remains constant after testing in 1 M NaOH at 60 °C over 500 h.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Min Li,Wujun Ma,Liping Zhang,Christiana Agbo,Shaohai Fu
Five disperse dyes (D1–D5) with 2,6-bichlor-4-nitroaniline or 2-chloro-4-nitroaniline as the diazo component and N-substituted anilines as the coupling component were designed and synthesized in order to compare the differences derived from their molecular structure. All the synthesized disperse dyes were characterized by FT-IR, 1H NMR, and elemental analysis. Their spectral property was evaluated with respect to visible absorption properties in various solvents of distinguishable polarity. The synthesized disperse dyes were applied on one-step dyeing of polyethylene terephthalate (PET) fabric. The alkali stability of the dyes in case of one-step dyeing at various NaOH concentrations was discussed by comparing color parameters of the dyed PET fabrics. Besides, the alkali stability of the dyes was investigated with respect to the nature of chemical constitution and the substituents therein by X-ray crystal diffraction analysis. The results show that D4 and D5 have excellent alkali stability and can combine pretreatment and dyeing in an alkali bath, which could be attributed to the head-to-tail compact structure, intramolecular and intermolecular forces and large sterically hindered group (−CH2–Ph). The levelness and color fastness as well as mechanical properties of the dyed PET fabrics with a one-step dyeing method were measured by an ISO standard method.
研究领域:
化学工程
·
材料科学
·
纺织科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Fang Hua Liu,Chen Xiao Lin,En Ning Hu,Qian Yang,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
To explore the alkaline stability of cationic groups, several investigations have been reported via small molecule model compounds, theoretical calculations or grafting cations to the benzylic positions of the polymer backbones. In this work, anion exchange membranes (AEMs) with various head groups of trimethylammonium (TMA), 1-methylpyrrolidinium (MPY), 1-methylpiperidinium (MPRD), 1-methylimidazolium (Im1) and 1,2-dimethylimidazolium (Im1,2)) flexibly linked to poly(ether sulfone) (PES) backbones are prepared to explore the effect of pendent functional groups. The AEMs tethering MPRD groups are found to exhibit the highest Br − conductivity of 60.4 ± 2.1 mS cm −1 at 80 °C. PES-MPY exhibits the best relative stability and maintains 90.7% and 83.1% of the original ionic exchange capacity (IEC) and conductivity, respectively, after immersed into 2 M NaOH at 60 °C for 672 h. Meanwhile, the alkaline stability is in the order of PES-MPY > PES-MPRD > PES-TMA > PES-Im1,2 > PES-Im1. The maximum power density of a H 2 /O 2 fuel cell using PES-MPRD (109.0 mW cm − 2 ) and PES-MPY (106.5 mW cm −2 ) is larger than that using PES-Im1 (65.1 mW cm −2 ). The results provide a guidance for designing high-performance AEMs.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Yuliang Jiang,Chao Wang,Jiefeng Pan,Arcadio Sotto,Jiangnan Shen
The preparation of quaternary ammonium polysulfone anion exchange membranes (AEMs) with good dimensional stability and alkaline stability is an urgent problem to solve. In response, a series of cross-linked based on polysulfone and 4, 4′-trimethylenedipiperidine (TMDP) as crosslinkers with different degrees AEMs were developed in this work through a simple process. Among the fabricated AEMs, CAPSF-5 exhibits superb alkaline stability in a 1 M KOH aqueous solution at 60 °C for 15 days, whereas the non-crosslinked APSF membrane became tremendously brittle within 24 h and could not be further studied under the same conditions. In addition, even at 60 °C, CAPSF-5 demonstrates a superior dimensional stability compared to the non-crosslinked APSF membrane due to the formation of a dense internal network structure. These observations demonstrate that crosslinked CAPSF membranes can be a viable strategy to improve the deficiency of the polysulfone backbone, especially in terms of alkaline stability.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yanhua Wang,Jingmin Yan,Zhengchen Li,Xiang Liu,Xiaomeng Zhang,Lianqi Wei,Shufeng Ye
Owing to the changeable components of oil–water system and the inflexible limitation of available materials during oil–water separation, the treatment of oily wastewater with wide pH, large discharge and high COD value remains a great challenge. In this study, a simple strategy was used to construct Gemini composite based on TiO 2 pillared montmorillonite . The resultant montmorillonite-based Gemini composite (QATMt-x) exhibited high surface area (116.54 m 2 g −1 ), surface potential (18.8 mV at pH2), good acid and alkali resistance, amphiphilic-multifunctional surface, and defective layered structure and, as a result, delivered high capability (E D ≥ 96 %) and long cyclic life for oil–water separation. More significantly, detailed mechanism studies reveal that the crucial reasons of oil–water separation on microemulsion and aqueous containing organic contaminant are demulsification through electron capture of the grafted chitosan, and adsorption by lipophilic saturated alkanes, titanium hydrates, (metal) hydroxyl and amine group, respectively. Hence, QATMt-x is particularly suitable for efficient demulsification in acidic media (pH 2) and for the adsorption of ecotoxic organic substances (e.g., perfluorooctanoic acid, methyl blue). In short, construction of Gemini surfactants based on low-cost inorganic carriers would offer new strategies in exploring amphipathic dual-functional layered structures for simultaneously efficient separation of multisystem oil–water scenarios.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Liang Hao,Junbin Liao,Yuanwei Liu,Huimin Ruan,Arcadio Sotto,Bart Van der Bruggen,Jiangnan Shen
The present work reports the preparation of a series of novel highly durable imidazolium-decorated anion exchange membranes (AEMs), with 3D network structure, via ultraviolet crosslinking reaction between 1-vinylimidazole and 1,6-hexanedithiol. AEM modified with trimethylamine (TMA) groups (no crosslinking, 45.7%) showed a significantly reduced water uptake within a range of 14.4–23.6% at 80 °C. Due to relatively good alkali-resistant of imidazolium groups and the compact structure stemmed from crosslinking network, the optimum cross-linked AEM (BPPO-Im 0.3) can retard the degradation and exhibits superior alkaline stability in 1.0 M NaOH at 60 °C for over 15 days, compared with TMA modified AEM. In ED application, BPPO-Im 0.3 AEM has a higher NaCl removal ratio of 77.82% than that of commercial AEM-Type II (74.13%) within 3 h experimental time. Accordingly, it shows higher current efficiency (67.43%) and lower energy consumption (1.94 kWh kg −1 NaCl), compared to commercial one (62.83%; 2.05 kWh kg −1 ). The facile fabrication process and the better-performance are suggestive of that BPPO-Im 0.3 is potentially applicable in ED.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Yuchao Niu,Jiannan Li,Weiming Yu,Wanting Chen,Xuemei Wu,Gaohong He,Miao Yu,Tiantian Li
A flexible hydrophilic chain segment with ether bonds and a long hydrophobic tail chain with multiple carbon atoms are designed and grafted on the same side of the polymer backbone, which can not only improve the alkaline stability by preventing the benzyl carbon from being attacked by OH - , but also reduce the hydration degree of the membrane, giving it excellent conductivity, alkaline stability and low swelling ratio. These results show that the prepared anion exchange membranes (AEMs) with a hydrophilic chain segment containing 2 ether bonds exhibits the best overall performance. Its ionic conductivity can reach 90.4 mS cm −1 at 80 °C, the swelling ratio is less than 8%, the tensile strength can reach 14.5 MPa, and the elongation at break is 79.0%. Even after being soaked under alkaline conditions for 672 h, the conductivity of the original membrane still remains over 85%. The peak power density of the fuel cell using this AEM can reach as high as 582 mW cm −2 . The segmented hydrophilic and hydrophobic side chain proposed in this work provides a novel idea to design the AEM materials and improve the performance of anion exchange membrane fuel cell.
研究领域:
材料科学
·
燃料电池工程
✓ 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）