SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Haoze Zeng,Yanbo Li,Cunwen Wang
SPEEK (sulfonated poly ether ether keton) is a type of very attractive polymeric material in membrane applications. Properties of SPEEK membranes can be tailored through controlling its sulfonation degree. However, the sulfonation degree affects the mechanical strength and membrane stability. SPEEK/PES composite membranes were prepared via a surface coating method. Those membranes show lower retentions due to the swelling of SPEEK. ZIF-8, constructed from zinc centers and 2-methlimidazole ligands, was incorporated into SPEEK to improve their performance. Sulfonation groups in SPEEK closely link to ZIF-8 through the coordination and electrostatic interactions, proved by ATR-IR characterizations and IEC measurements. The ionic crosslinked ZIF-8-SPEEK composite membranes show a higher desulfonation temperature and a lower swelling, evidenced by the TGA results and the water uptake values of ZIF-8-SPEEK composites. The crossflow filtrations show the ionic crosslinked ZIF-8-SPEEK composite membranes have good retentions of PEG1000 (70–90%), dyes (>90%) and salts (30–40%). The membrane retentions increase, whereas the permeances decrease after filling of ZIF-8. More than 100 h filtrations indicate that those membranes have a good stability. Although ZIF-8 particles are believed providing extra permeating channels, the strong ionic interactions have a domain effect on the membrane permeance.
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
POLYMER
·
2022
·
IF 4.432
Zhifu Guan,Yiqi Jin,Sha Shi,Biyao Jin,Meishan Zhang,Lianhua Zhao
To enhance the conductivity of sulfonated polyether ether ketone (SPEEK, SP) membrane and avoid the loss of ionic liquid (IL), using aminopropyloligosisiloxane (NH 2 -POSS) as molecular hybrid filler, a self-assembled medium temperature and non-humidified SP/IL/NH 2 -POSS hybrid membrane was prepared. NH 2 -POSS can be assembled into the hydrophilic domain ion phase of SPEEK. In which, –NH 2 of NH 2 -POSS and –SO 3 H of SPEEK formed acid-base pairs at the interface which were conducive to the construction of proton transport channel. In addition, NH 2 -POSS enriched IL in the hydrophilic domain, which retained IL while synergistically increased the conductivity. The results showed that the IL loss rate of SP/IL/NH 2 -POSS-2 membrane was 46.9 wt%, which was about 55.8% of SP/IL membrane; the conductivity of SP/IL/NH 2 -POSS-2 membrane at 200 °C without humidification was 5.51 mS·cm −1 , which was about 4 times that of SP/IL membrane.
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 Electrochemical Science
·
2023
·
IF 1.5
Zhengping Zhao,Zeping Zhou,J.I. Jianbing,Fang Xie
A type of poly(aminobenzene sulfonic)phosphazene derivative grafted SPEEK was synthesized which were confirmed by FT-IR and NMR analysis. And a series of grafted SPEEK proton exchange membranes with 65% sulfonation degree were prepared. Comparing to SPEEK membranes, all the properties increased. The proton conductivity reached 4.21×10 -3 S/cm with 15 % grafting degree and the methanol permeability coefficient increased at 2.72×10 -7 cm 2 ·s -1 to achieve the using requirements of DMFC proton exchange membrane.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Tidong Wang,Yichong Cai,Jin Ma,Zheng Han,Sida Rong,Qiang Ye,Ya Ji
With the growing demand of energy storage techniques in carbon-neutral environments, vanadium redox flow batteries (VRFBs) have emerged as outstanding systems for long-duration energy storage. Developing high-performance ion exchange membrane is essential for broad deployment of RFBs. In this work, a SPEEK/PTFE membrane is designed by incorporating polytetrafluoroethylene (PTFE) nanoparticles into sulfonated poly (ether ether ketone) (SPEEK) membrane by bio-inspired polydopamine (PDA) bridge. PDA combines SPEEK membrane and hydrophobic PTFE nanoparticle tightly by its abundant functional groups. The ion selectivity of optimal SPEEK/PTFE-0.5 % membrane is 8.9 times greater than that of Nafion 115. Remarkably, VRFB with optimal SPEEK/PTFE-0.5 % membrane exhibits excellent battery performances including impressive columbic efficiency (CE, 99.5 %) and energy efficiency (EE, 86.3 %) at 100 mA cm −2 surpassing Nafion 115 (CE, 95.8 %; EE, 83.4 %). Besides, VRFB employing SPEEK/PTFE-0.5 % membrane demonstrates excellent cycling stability, with higher capacity retention (71.4 % after 300 cycles) compared to Nafion 115, indicating its capability of extended operation. This work illustrates that the design of PDA bridge in composite membrane is a useful approach for developing high-performance membranes in RFBs.
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 7
·5501-5510
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IF 2.599
Li Cuicui,Zhang Yunfeng,Liu Xupo,Dong Jiaming,Wang Jiaying,Yang Zehui,Cheng Hansong
The current direct methanol fuel cells are still largely limited to the neat methanol operation due to the high methanol permeation of the currently used Nafion membranes. To achieve high methanol concentration DMFC application of the sulfonated poly(ether ether ketone) (SPEEK)-based proton exchange membrane, the neat SPEEK membrane is here modified by blending with the designed cross-linked fully aromatic sulfonated polyamide (Cr- fa -SPA). As the similar fully aromatic features of the SPEEK and the Cr- fa -SPA and the formed hydrogen bonding interactions between the SPEEK and the Cr- fa -SPA, the SPEEK/Cr- fa -SPA membranes show good compatibility, which is beneficial for the construction of the uniform and contact morphology of the membrane. In addition, the cross-linking network and the hydrogen bonding interactions in the SPEEK/Cr- fa -SPA membranes are favorable for enhancing the dimensional stability and reducing the methanol permeation. In particular, the lowest methanol permeability of 0.46 × 10 −7 cm 2 /s is successfully obtained by blending 40 wt% Cr- fa -SPA in the SPEEK/Cr- fa -SPA membrane, which is almost two magnitudes lower than that of the Nafion 117 membrane. Finally, the SPEEK/Cr- fa -SPA DMFC devices were successfully demonstrated with the highly concentrated 20 M methanol fuels with remarkable performance.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）