scholarly journals Effects of Concentration of Organically Modified Nanoclay on Properties of Sulfonated Poly(vinyl alcohol) Nanocomposite Membranes

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Apiradee Sanglimsuwan ◽  
Narumon Seeponkai ◽  
Jatuphorn Wootthikanokkhan
Keyword(s):  
Fuel Cells ◽  
Proton Conductivity ◽  
Vinyl Alcohol ◽  
Direct Methanol Fuel Cells ◽  
Proton Exchange ◽  
Methanol Permeability ◽  
Poly Vinyl Alcohol ◽  
Nanocomposite Membranes ◽  
Organically Modified ◽  
Sulfonated Poly

Electrolyte nanocomposite membranes for proton exchange membrane fuel cells and direct methanol fuel cells were prepared by carrying out a sulfonation of poly(vinyl alcohol) with sulfosuccinic acid and adding a type of organically modified montmorillonite (layered silicate nanoclay) commercially known as Cloisite 93A. The effects of the different concentrations (0, 2, 4, 6, 8 wt. %) of the organoclay in the membranes on water uptake, ion exchange capacity (IEC), proton conductivity, and methanol permeability were measured, respectively, via gravimetry, titration, impedance analysis, and gas chromatography techniques. The IEC values remained constant for all concentrations. Water uptakes and proton conductivities of the nanocomposite membranes changed with the clay content in a nonlinear fashion. While all the nanocomposite membranes had lower methanol permeability than Nafion115, the 6% concentration of Cloisite 93A in sulfonated poly(vinyl alcohol) membrane displayed the greatest proton conductivity to methanol permeability ratio.

Performance of Sulfonated Poly(Vinyl Alcohol)/Graphene Oxide Polyelectrolytes for Direct Methanol Fuel Cells

2020 ◽  
Vol 8 (7) ◽  
pp. 2000124
Author(s):  
Oscar Gil-Castell ◽  
Óscar Santiago ◽  
Borja Pascual-Jose ◽  
Emilio Navarro ◽  
Teresa J. Leo ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Fuel Cells ◽  
Vinyl Alcohol ◽  
Direct Methanol Fuel Cells ◽  
Poly Vinyl Alcohol ◽  
Direct Methanol ◽  
Methanol Fuel Cells ◽  
Sulfonated Poly

Highly selective sulfonated Poly (arylene ether nitrile) composite membranes containing copper phthalocyanine grafted graphene oxide for direct methanol fuel cell

2021 ◽  
pp. 095400832110394
Author(s):  
Yan Ma ◽  
Kaixu Ren ◽  
Ziqiu Zeng ◽  
Mengna Feng ◽  
Yumin Huang
Keyword(s):  
Graphene Oxide ◽  
Proton Conductivity ◽  
Direct Methanol Fuel Cells ◽  
Copper Phthalocyanine ◽  
Composite Membranes ◽  
Proton Exchange ◽  
Methanol Permeability ◽  
Arylene Ether ◽  
Direct Methanol ◽  
Sulfonated Poly

To improve the performances of sulfonated poly (arylene ether nitrile) (SPEN)–based proton exchange membranes (PEMs) in direct methanol fuel cells (DMFCs), the copper phthalocyanine grafted graphene oxide (CP-GO) was successfully prepared via in situ polymerization and subsequently incorporated into SPEN as filler to fabricate a series of SPEN/CP-GO-X (X represents for the mass ratio of CP-GO) composite membranes. The water absorption, swelling ratio, mechanical properties, proton conductivity, and methanol permeability of the membranes were systematically studied. CP-GO possesses good dispersion and compatibility with SPEN matrix, which is propitious to the formation of strong interfacial interactions with the SPEN, so as to provide more efficient transport channels for proton transfer in the composite membranes and significantly improve the proton conductivity of the membranes. Besides, the strong π–π conjugation interactions between CP-GO and SPEN matrix can make the composite membranes more compact, blocking the methanol transfer in the membranes, and significantly reducing the methanol permeability. Consequently, the SPEN/CP-GO-1 composite membrane displayed outstanding tensile strength (58 MPa at 100% RH and 25°C), excellent proton conductivity (0.178 S cm−1 at 60°C), and superior selectivity (5.552 × 105 S·cm−3·s). This study proposed a new method and strategy for the preparation of high performance PEMs.

Sulfonated poly (arylene ether sulfone)-graft-sulfonated poly (vinyl alcohol) proton exchange membranes: Improved proton selectivity

2020 ◽  
pp. 095400832096816
Author(s):  
Hailin Yu ◽  
Yinghan Wang
Keyword(s):  
Vinyl Alcohol ◽  
Substitution Reaction ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Methanol Permeability ◽  
Poly Vinyl Alcohol ◽  
H Nmr ◽  
Arylene Ether ◽  
High Proton ◽  
Sulfonated Poly

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.

Suppression of methanol cross-over in novel composite membranes for direct methanol fuel cells

2009 ◽  
Vol 81 (12) ◽  
pp. 2309-2316 ◽  
Author(s):  
Yong Fang ◽  
Ruiying Miao ◽  
Tongtao Wang ◽  
Xindong Wang
Keyword(s):  
Fuel Cells ◽  
Proton Conductivity ◽  
Direct Methanol Fuel Cells ◽  
Base Material ◽  
Proton Conductor ◽  
Composite Membranes ◽  
Methanol Permeability ◽  
Poly Vinyl Alcohol ◽  
Direct Methanol ◽  
Methanol Fuel Cells

A series of novel composite membranes was prepared by using poly(vinyl alcohol) (PVA) with polyimide (PI) as base material and 8-trimethoxysilylpropyl glycerine ether-1,3,6-pyrenetrisulfonic acid (TSGEPS) as proton conductor for direct methanol fuel cells (DMFCs). The parameters of membranes, including water sorption, hydrolysis stability, dimensional stability, proton conductivity, and methanol permeability were studied. The proton conductivity of the membranes is in the order of 10–2 S/cm, and the membranes show better resistance to methanol permeability (1.51 × 10–7 cm2 s–1) and better selectivity (20.6 × 104 S cm–3 s) than those of Nafion115 under the same measurement conditions.

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