Preparation of High Performance SPEEK/Cloisite 15A Nanocomposite Membrane via Advanced Membrane Formulation Method

2014 ◽  
Vol 70 (2) ◽  
Author(s):  
Juhana Jaafar ◽  
A. F. Ismail ◽  
T. Matsuura ◽  
M. H. D. Othman ◽  
Mukhlis A. Rahman ◽  
...  
Keyword(s):  
Proton Conductivity ◽  
Polymer Matrix ◽  
High Performance ◽  
Morphological Structure ◽  
Nanocomposite Membrane ◽  
Methanol Permeability ◽  
Solution Intercalation ◽  
High Proton ◽  
Poly Ether Ether Ketone ◽  
Cloisite 15A

Sulfonated poly (ether ether ketone) (SPEEK)/Cloisite 15A® nanocomposite membranes were prepared via solution intercalation method. For better dispersion of nanoclay in the polymer matrix, the solution intercalation method was modified and a compatibilizer was introduced. The state of nanoclay dispersion was determined by FESEM. The effect of the solution formulation preparation method and compatibilizer on the performance properties such as proton conductivity and methanol permeability of all membranes was studied. FESEM analysis confirmed that SPEEK/Cloisite 15A® nanocomposite membrane prepared via modified solution intercalation method and in the presence of compatibilizer was the best membrane in terms of its morphological structure. Due to its well nanoclay distribution in polymer matrix, this kind of membrane exhibited the highest selectivity owing to its high proton conductivity and low methanol permeability. SPEEK/Cloisite 15A® with compatibilizer prepared via modified solution intercalation method was found to be the best membrane. 

Electerochemical Study of Speek/Cloisite 15A®/TAP Membrane at Moderate Temperature for DMFC Application

2013 ◽  
Vol 684 ◽  
pp. 80-84
Author(s):  
H. Ilbeygi ◽  
A.F. Ismail ◽  
M.M. Nasef ◽  
J. Jaafar ◽  
E. Jalalvandi ◽  
...  
Keyword(s):  
Open Circuit ◽  
Methanol Permeability ◽  
Solution Intercalation ◽  
Temperature Range ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Direct Methanol ◽  
Ether Ketone ◽  
Methanol Fuel Cell ◽  
Cloisite 15A

This study was to investigate the properties of the sulfonated poly(ether ether ketone) (SPEEK) nanocomposite membranes filled with Cloisite 15A® clay, in the presence of 2,4,6 triaminopyrimidine (TAP) as a compatibilizer. The membranes were prepared via solution intercalation method, before they were subjected to performance tests in the temperature range of 27 to 80 oC for comparison with Nafion® 117. The SPEEK membranes were then utilized to measure the open circuit voltage (OCV) and power density for direct methanol fuel cell (DMFC) applications in the temperature range of 27 to 60 oC. The best data obtained, among all the tested membranes, were methanol permeability of 0.52 ×10-6 cm2s-1 and proton conductivity of 47 mScm-1 with the methanol selectivity of 9.1 × 104 S.s.cm-3, even at a high temperature of 60oC.

A promising Al-CeZrO4/HPW-incorporated SPEEK composite membrane with improved proton conductivity and chemical stability for PEM fuel cells

2020 ◽  
pp. 095400832095707
Author(s):  
Yingfeng Wang ◽  
Jiabin You ◽  
Zhuowei Cheng ◽  
Kun Jiang ◽  
Linlin Zhang ◽  
...  
Keyword(s):  
Proton Conductivity ◽  
Composite Membrane ◽  
Chemical Stability ◽  
Pem Fuel Cells ◽  
Nanocomposite Membrane ◽  
Acid Base ◽  
Base Pairs ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Speek Membrane

An improved sulfonated poly (ether ether ketone) (SPEEK) nanocomposite membrane was prepared by incorporating both phosphotungstic acid (HPW) and Al doped cerium-based oxides (Al-CeZrO4) in SPEEK matrix. The HPW was immobilized by Al-CeZrO4 so that firmly dispersed acid–base pairs were formed. The introduction of Al-CeZrO4 helped improve the chemical stability of the pristine (baseline) SPEEK membrane without compromising the conductivity, and the addition of HPW further enhanced the conduction of protons through acid–base interactions. Stability tests showed that when the SPEEK/Al-CeZrO4 nanocomposite membrane was immersed in a Fenton’s solution for 108 h at 80°C, a loss of 34.9% in proton conductivity was observed, which is 24.1% less than that of the pristine SPEEK membrane, indicating that the attenuation of membrane proton conductivity was inhibited. At the same time, the proton conductivity of the SPEEK/Al-CeZrO4/HPW nanocomposite membrane (that has already incorporated HPW) was increased by 15.5% compared to the SPEEK/Al-CeZrO4 nanocomposite membrane. Hence, Al-CeZrO4/HPW is considered as an effective inorganic nanofiller for improving both proton conductivity and chemical stability of SPEEK membranes, and the hybrid composite membrane is worth further studying.

Facile Preparation of Well-Dispersed GO-SPEEK Composite Membranes by Electrospun for Fuel Cell Applications

2015 ◽  
Vol 1735 ◽  
Author(s):  
Xu Liu ◽  
Xiaoyu Meng ◽  
Chuanming Shi ◽  
Jiangbei Huo ◽  
Ziqing Cai ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Proton Conductivity ◽  
Composite Membrane ◽  
Composite Membranes ◽  
Proton Exchange ◽  
Electrospinning Technique ◽  
Fuel Cell Application ◽  
High Proton ◽  
Poly Ether Ether Ketone ◽  
Direct Methanol

ABSTRACTGraphene oxide (GO) is one of the most attractive inorganic nanofillers in proton exchange membranes (PEMs) for its large specific surface area and high proton conductivity. The proton conductivity of GO nanosheet is known to be orders of magnitude greater than the bulk GO, thus it is essential to improve the dispersion of GO nanosheets in the PEM matrix to achieve higher conductivity. In this study, we report a facile and effective method to fabricate a GO/sulfonated poly ether ether ketone (SPEEK) composite membrane with well-dispersed GO nanosheets in SPEEK matrix by using electrospinning technique for direct methanol fuel cell application. The composite membrane exhibits improved proton conductivity, dimensional stability and methanol barrier property due to the presence of well-dispersed GOs. It is believed that the GO nanosheets can not only induce continuous channels for proton-conducting via Grotthuss mechanism, but also act as methanol barriers to hinder the methanol molecules from passing through the membrane.

A highly proton-conducting, methanol-blocking Nafion composite membrane enabled by surface-coating crosslinked sulfonated graphene oxide

2016 ◽  
Vol 52 (10) ◽  
pp. 2173-2176 ◽  
Author(s):  
Guangwei He ◽  
Xueyi He ◽  
Xinglin Wang ◽  
Chaoyi Chang ◽  
Jing Zhao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Oxide Film ◽  
Proton Conductivity ◽  
Composite Membrane ◽  
Surface Coating ◽  
Nafion Membrane ◽  
Methanol Permeability ◽  
High Proton Conductivity ◽  
High Proton ◽  
Sulfonated Graphene

Coating an ultrathin graphene oxide film onto a Nafion membrane confers a distinct anti-tradeoff behavior: 93% decrease of methanol permeability while retaining the high proton conductivity.

Asymmetric Polysulfone-Cloisite 15A® Nanocomposite Membrane for Gas Separation

2014 ◽  
Vol 69 (9) ◽  
Author(s):  
A. K. Zulhairun ◽  
A. F. Ismail ◽  
A. Mustafaa
Keyword(s):  
Gas Permeation ◽  
Nanocomposite Membrane ◽  
Co2 Removal ◽  
Nanocomposite Membranes ◽  
Solution Intercalation ◽  
Gas Streams ◽  
Gas Selectivity ◽  
Clay Layers ◽  
Permeation Properties ◽  
Cloisite 15A

Defect-free asymmetric Polysulfone (PSF)-Cloisite 15A® nanocomposite membrane was fabricated with the intention to investigate the gas permeation behavior of the resulting material combination. Various weights of Cloisite 15A® organoclay were added into PSF matrices by solution intercalation method assisted by sonication dispersion. The gas permeation properties of the PSF-Cloisite 15A® nanocomposite membranes were evaluated by pure gases: nitrogen, methane, and carbon dioxide. The distribution of Cloisite 15A® particles in PSF matrices was analyzed by SEM. The gas flux of the PSF-Cloisite 15A® nanocomposite membranes declined as the Cloisite 15A® weight loading increased. The CO2/CH4 and CO2/N2 pure gas selectivity of PSF nanocomposite with 0.5 wt. % of Cloisite 15A® loading exceeded that of neat PSF membrane. The decrease in flux followed by the increase in pure gas selectivity was related to the way in which the clay layers were dispersed in the PSF matrices. Considerable improvement in CO2 selectivity was attainable even by incorporating low amount of such layered structure nanoparticle which can be attractive in producing robust materials for CO2-removal membranes from CO2-containing gas streams such as post-combustion and natural gas streams.

A DNA-Threaded ZIF-8 Membrane with High Proton Conductivity and Low Methanol Permeability

2017 ◽  
Vol 30 (2) ◽  
pp. 1705155 ◽  
Author(s):  
Yi Guo ◽  
Zhongqing Jiang ◽  
Wen Ying ◽  
Liping Chen ◽  
Yazhi Liu ◽  
...  
Keyword(s):  
Proton Conductivity ◽  
Methanol Permeability ◽  
High Proton Conductivity ◽  
High Proton

scholarly journals Self-Assembly DBS Nanofibrils on Solution-Blown Nanofibers as Hierarchical Ion-Conducting Pathway for Direct Methanol Fuel Cells

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1037 ◽  
Author(s):  
Hang Wang ◽  
Xiangxiang Li ◽  
Xiaojie Li ◽  
Xi Feng ◽  
Weimin Kang ◽  
...  
Keyword(s):  
Proton Conductivity ◽  
Water Uptake ◽  
Self Assembly ◽  
High Performance ◽  
Direct Methanol Fuel Cells ◽  
Composite Membranes ◽  
Proton Exchange ◽  
Methanol Permeability ◽  
Conducting Pathway ◽  
Ion Conducting

In this work, we reported a novel proton exchange membrane (PEM) with an ion-conducting pathway. The hierarchical nanofiber structure was prepared via in situ self-assembling 1,3:2,4-dibenzylidene-d-sorbitol (DBS) supramolecular fibrils on solution-blown, sulfonated poly (ether sulfone) (SPES) nanofiber, after which the composite PEM was prepared by incorporating hierarchical nanofiber into the chitosan polymer matrix. Then, the effects of incorporating the hierarchical nanofiber structure on the thermal stability, water uptake, dimensional stability, proton conductivity, and methanol permeability of the composite membranes were investigated. The results show that incorporation of hierarchical nanofiber improves the water uptake, proton conductivity, and methanol permeability of the membranes. Furthermore, the composite membrane with 50% hierarchical nanofibers exhibited the highest proton conductivity of 0.115 S cm−1 (80 °C), which was 69.12% higher than the values of pure chitosan membrane. The self-assembly allows us to generate hierarchical nanofiber among the interfiber voids, and this structure can provide potential benefits for the preparation of high-performance PEMs.

Studies on Proton Conductivity and Methanol Permeability of Poly(ether sulfone)/Sulfonated Poly(ether ether ketone) Blend Membranes

2008 ◽  
Vol 1098 ◽  
Author(s):  
Hong Zhu ◽  
Wein-Duo Yang ◽  
Yong-sheng Wei ◽  
Wu-bin Yang ◽  
Xue-qing Yu ◽  
...  
Keyword(s):  
Proton Conductivity ◽  
Methanol Permeability ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Blend Membranes ◽  
Direct Methanol ◽  
Concentrated Sulfuric Acid ◽  
Ether Ketone ◽  
Methanol Fuel Cell ◽  
Sulfonated Poly

AbstractPartially Sulfonated Poly(ether ether ketone) (SPEEK) samples were prepared by modification of corresponding poly(ether ether ketone) (PEEK) with concentrated sulfuric acid. Poly(ether sulfone)(PES) was blended into SPEEK to prepare PES/SPEEK blend membranes by solution casting. The glass transition temperature of blend membranes indicated the molecular miscibility between PES and SPEEK. Characteristics of the blend membranes, including water uptake, thermal stability, methanol permeability, swelling degree, proton conductivity, etc, were investigated. PES played an important role in the blend membranes. Though the proton conductivity of PES/SPEEK blend membranes decreased to some extent, their performance for barrier methanol and swelling had remarkably enhanced, showing the feasibility for direct methanol fuel cell.

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