SOLID STATE IONICS
·
2019
·
IF 2.886
Xi Zhu,Chunhui Shen,Shanjun Gao,Huaiyang Jin,Xiangze Cheng,Chenliang Gong
A series of high-temperature proton exchange membranes were prepared by incorporating phosphonic acid functionalized siloxane synthesized from Amino Trimethylene Phosphonic Acid (ATMP) and 3-Aminopropyltriethoxysilane (APTES) into cross-linked 1-Methylimidazole-functionalized poly(2,6-dimethyl-1,4-phenyleneoxide) (PPO) backbone. The structural characteristics of membranes were investigated using FT-IR, 1 H NMR and XRD , indicating that ATMP and backbones of membranes were successfully immobilized into cross-linking Si-O-Si networks formed by hydrolysis-polycondensation of APTES. The resultant membranes named as HTM-X exhibited superior oxidative resistance, mechanical properties and dimensional stability, even the thermal stability was up to 210 °C. The proton conductivities of membranes were also measured under different temperature. The result showed that HTM-15 membrane, whose content of phosphonic acid functionalized siloxane was 15 wt%, possessed the highest proton conductivity of 8.48 × 10 −2 S cm −1 at 160 °C and low relative humidity (5%) with the contribution of dual proton transfer channels of acid-base pairs and continuous hydrogen bond networks. Therefore, this novel membrane acts as a potential candidate for proton exchange membranes operating at elevated temperature.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Zhengfang Zhu,Peng Cui,Yu Lu,Jianrong Wu,Jing Zeng,Weiye Ma,Xinsheng Zhao,Yuanqin Zhu
To develop a facile route towards anion conductive polymers containing multi-cation side chains, novel anion conductive poly (2,6-dimethylphenylene oxide)s (DQPPO-x-I) was prepared from a clickable di-quaternized side-chain precursor, via Cu(I)-catalyzed azide-alkyne click chemistry. The new precursor was synthesized from commercially available 2-{[2-(dimethylamino)ethyl]methylamino}ethanol and 3-bromopropyne via nucleophilic substitution and Menshutkin reaction . The chemical structures of the precursor and DQPPO-x-I polymers were characterized by 1 H NMR and FT-IR. Small angle X-ray scattering and transmission electron microscopy revealed that the obvious micro-phase separation was formed in the DQPPO-x-I membranes. The optimized DQPPO-19-OH membrane with ion exchange capacity of 2.13 meq./g exhibited the highest hydroxide conductivity of 31.6 mS/cm at 80 °C, tensile strength of 64 MPa, and thermal stability (onset decomposition temperature up to 187 °C).
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
RSC Advances
·
2016
·Vol. 6
·期 108
·106237-106247
·
IF 3.289
Gongwen Zou,Wei Wu,Chuanbo Cong,Xiaoyu Meng,Kun Zhao,Qiong Zhou
To achieve desirable performance of a polymer electrolyte membrane with higher proton conduction and better mechanical strength is a challenging work in the development of the phosphoric acid (PA) doped solid-state membrane for high temperature proton exchange membrane fuel cells. Firstly, phosphonated poly(2,6-dimethyl-1,4-phenylene oxide) (pPPO) was prepared by the bromination and phosphonation of poly(2,6-dimethyl-1,4-phenylene oxide). Afterward, a series of poly(vinyl pyrrolidone)–phosphonated poly(2,6-dimethyl-1,4-phenylene oxide) (PVP/pPPO) blend membranes and poly(vinyl pyrrolidone)–phosphonated poly(2,6-dimethyl-1,4-phenylene oxide)–graphitic carbon nitride (PVP/pPPO/g-C3N4) nanocomposite membranes were prepared by a solution casting method. The PA uptake, volume swelling ratio, and proton conductivity of the PVP/pPPO blend membrane increased with increasing PVP content. But PA molecules drastically reduced the mechanical strength of the PVP/pPPO blend membrane. The incorporation of g-C3N4 improved the proton conduction and mechanical properties of the nanocomposite membrane due to the proton hopped sites provided by NH2 and the interaction of g-C3N4 and polymer chains. A higher proton conductivity of 74.4 mS cm−1 and a higher power density of 294 mW cm−2 at 180 °C without additional humidifying were observed for the PA doped PVP/pPPO nanocomposite membrane containing 5 wt% g-C3N4. The results show the PVP/pPPO nanocomposite membrane as a potential polymer electrolyte membrane for high temperature fuel cells.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 15
·7919-7928
·
IF 7.443
Ying Tang,Beibei Tang,Peiyi Wu
A temperature-responsive composite membrane with tunable responsive behavior was prepared by covalently grafting a polymeric ionic liquid (PIL) functionalized temperature-responsive copolymer onto the brominated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) supporting membrane. The “switch” effect of the composite membrane can be facilely adjusted by tuning the counter-ion of PIL units of the grafted copolymer based on the transformation between hydrophilicity and hydrophobicity of PIL. The response temperature of the composite membrane was decreased with increasing the content of hydrophobic PIL units. Both the pure water flux and rejection of dyes and polyethylene glycol (PEG) of the composite membrane show a good responsiveness with changing the temperature. The study provides an easily available, flexible and effective method for the design and preparation of a temperature-responsive membrane with tunable responsive behavior to satisfy various applications.
研究领域:
材料科学
·
化学工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Zhiyan Sui,Zhe Wang,Yan Wang
Using carboxylated graphene oxide (CFGO) as inorganic crosslinking agent, a series of poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) based complex anion exchange membranes (AEMs) with pyridine cations as conduction sites were prepared successfully. The carboxyl modification can improve the dispersibility of inorganic filler in the polymer and provide more crosslinking sites. At the same time, the two-dimensional layered structure of CFGO and a large number of hydrophilic groups provide good ion transport channels. As a result, compared with the original membrane, the crosslinked composite membranes showed better conductivity and chemical stability. Among them, the conductivity of AP-PPO-CFGO2 reached 102.41 mS/cm at 80 °C, and retained about 70% of the conductivity after soaking in 2 M NaOH for 800 h. Furthermore, the AP-PPO-CFGO2 displayed a power density of 277.5 mW/cm 2 in a H 2 /O 2 single cell test at 80 °C.
研究领域:
材料科学
·
化学工程
·
电化学
·
燃料电池
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Junhua Li,Hao Qian,Junbin Liao,Yeyang Li,Jingwen Xu,Quan Chen,Yuyang Yao,Junjie Mu,Yanqing Xu,Huimin Ruan,Xiaoliang Xu,Jiangnan Shen
Amphoteric polyelectrolytes have been used as the materials for the high-performance ion-exchange membranes applied in redox flow battery and electrodialysis (ED) etc . In this work, four amphoteric ion-exchange membranes (AIEMs) based on sodium 1-propanesulfonate-3-methylimidazole (MIm-PS) and 1-butylimidazole (BIm) decorated poly(2,6-dimethyl-1,4-phenylene oxide) have been prepared for mono-/bi-valent anion separation by using the electrodialyzer. The optimized AIEM has a low surface area resistance of 5.79 Ω⋅cm 2 . During the ED testing, at 2.5 mA⋅cm −2 , the perm-selectivity ( P S O 4 2 − C l − ) tested in a binary mixture of 0.05 M NaCl and 0.05 M Na 2 SO 4 , achieves the value of 16.12 at 30th min, which is significantly higher than that of anion-exchange membrane (1.68) as the reference. This superior separation performance has been further verified by the perm-selectivity of 55.5, tested in a single solution of 0.05 M NaCl or 0.05 M Na 2 SO 4 . The high perm-selectivity results from the electrostatic repulsion difference of mono-/bi-valent ions against the negatively-charged –SO 3 – groups, accompanying with pore-size sieving effect resulting from the smaller ion cluster space of 0.261 nm. It is interesting to find that AIEMs show the increased ion flux values of Cl − /SO 4 2− , though the presence of the negatively-charged –SO 3 − groups, which is possibly related to the convex particle-like surface that increasing the effective surface area for ions passing. This work may provide a reference to guide the architectural design of advanced monovalent anion-selective IEMs.
研究领域:
材料科学
·
电化学
·
膜技术
·
能源存储
✓ 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）