Preparation of poly(vinyl phosphate-b-styrene) copolymers and its blend with PPO as proton exchange membrane for DMFC applications

Li, Guang Hua; Lee, Young Moo; Cho, Chang Gi

doi:10.1016/j.ssi.2006.03.003

Cited by 44 publications

(18 citation statements)

References 32 publications

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“…The hydrolytic stability was evaluated by comparing the proton conductivity measurements before and after soaking the membranes in 60°C water for 2 weeks. It have been reported that negligible change in proton conductivity corresponds to an acceptable hydrolytic stability 33. Here, the manufactured C‐GS membranes in all compositions showed less than 10% loss in proton conductivity and weight, which could be considered as an indication of the stable ionically and covalently cross‐linked structure (Fig.…”

Section: Resultsmentioning

confidence: 53%

Structural modification of chitosan biopolymer as a novel polyelectrolyte membrane for green power generation

Dashtimoghadam

Hasani-Sadrabadi

Moaddel

2009

Polymers for Advanced Techs

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In the present study, a series of bioresource polyelectrolytes based on chitosan were synthesized and assessed for applicability in direct methanol fuel cells (DMFCs). A binary cross-linking agent (sulfosuccinic acid/glutaraldehyde) was used for the structural modification of chitosan and membranes comprising various amounts of sulfosuccinic acid (0, 8, 12, and 16 wt% SSA/wt chitosan) were prepared. It was found that by increasing the sulfonate groups' content up to 16 wt%, proton conductivity and methanol permeability properties reach the values of 0.0452 S cm S1 and 9.6 T 10 S7 cm 2 sec S1 , respectively. Based on the membrane selectivity evaluation and activation energy measurements of proton conduction, the optimum composition of cross-linking agent was determined. The optimum composition resulted in a relatively high proton conductivity of 0.0452 S cm S1 and a low methanol permeability of 9.6 T 10 S7 cm 2 sec S1 . Moreover, the optimum proton exchange membrane exhibited selectivity value of 47,100 in comparison with the corresponding value of 40,500 for Nafion 1 117. The fabricated membranes showed acceptable oxidative and hydrolytic stability. Furthermore, single cell DMFC performance test revealed a power density of 17 mW cm S2 at 30-C and 41 mW cm S2 at 60-C in a 2 M methanol feed. Hence, prepared proton-conducting bioresource ionomers could have promising potential in the field of green power generation as a low cost and biodegradable polyelectrolyte.

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Section: Resultsmentioning

confidence: 53%

Structural modification of chitosan biopolymer as a novel polyelectrolyte membrane for green power generation

Dashtimoghadam

Hasani-Sadrabadi

Moaddel

2009

Polymers for Advanced Techs

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“…5 8 8Ca nd 98 %r elative humidity or RH, single crystal). Theo bserved proton conductivity is comparable to that of Nafion (6.3 10 À2 Scm À1 for Nafion 117 at 60 8 8Ca nd 95 %R H [11] ). On theb asis of our extensive literature study,f or metal coordination compounds such as MOFs,t he highest measured number prior to this study is 4.2 10 À2 Scm À1 at 25 8 8Ca nd 98 %R H, found in an oxalate- Table S2).…”

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confidence: 72%

Cooperative Crystallization of Heterometallic Indium–Chromium Metal–Organic Polyhedra and Their Fast Proton Conductivity

et al. 2015

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Metal-organic polyhedra (MOPs) or frameworks (MOFs) based on Cr 3+ are notoriously difficult to synthesize, especially as crystals large enough to be suitable for characterization of the structure or properties.I ti sn ow shown that the co-existence of In 3+ and Cr 3+ induces arapid crystal growth of large single crystals of heterometallic In-Cr-MOPs with the [M 8 L 12 ]( M=In/Cr,L=dinegative 4,5-imidazole-dicarboxylate) cubane-like structure.W ith ah igh concentration of protons from 12 carboxyl groups decorating every edge of the cube and an extensive H-bonded network between cubes and surrounding H 2 Omolecules,the newly synthesized In-CrMOPs exhibit an exceptionally high proton conductivity (up to 5.8 10 À2 Scm À1 at 22.5 8 8Ca nd 98 %r elative humidity,s ingle crystal).Metal-organic frameworks (MOFs) [1] (or more generally coordination polymers,C Ps [2] )a nd hydrogen-bonded frameworks including recently developed hydrogen-bonded organic frameworks (HOFs) [3] have emerged as an ew promising class of materials that are capable of fast ion conductivity.T heir high crystallinity and open framework architecture,t ogether with tunable compositions and structures,m ake it possible to not only better design materials to optimize ion conduction carriers and pathways,but also better understand conducting behaviors and mechanisms. [4,5] Highly proton-conducting materials are essential in many applications,especially hydrogen fuel cells.F or MOF materials,r ecently reported strategies for enhancing the proton conductivity have focused on increasing the concentration of proton carriers by controlling framework or extra-framework compositions as well as on improving proton mobility by constructing materials with desired H-bonded networks.F or example,K itagawa et al. reported highly proton-conductive zinc oxalate MOFs by maximizing the proton carriers with the simultaneous introduction of adipic acid molecules on the framework and the counter cation (NH 4 ) + in the void space.[6]Another example is PCMOF2 1 = 2 reported by Shimizu et al. [7] which combined trisulfonate and triphosphonate groups and had conductivity over 0.01 Scm À1 . Thed esign strategy for the synthesis of MOFs can vary significantly depending on the intended applications.F or developing better proton conductors,t he conventional strategy targeting extended 1D,2D, or 3D frameworks may not always be desirable.T his is because ah igher dimensional structure generally requires ag reater degree of ligand deprotonation, which necessarily reduces the proton concentration. Forthis reason, we expect that discrete metal-organic polyhedra (MOPs) that can be formed through partial deprotonation of ligands might represent ap romising source of materials capable of improved fast proton conductivity. Thef inite polyhedral structures of MOPs provide an opportunity to decorate the entire surface with organic ligands that carry extra functional groups so that ahigher concentration of proton carriers can be achieved. Moreover,t he extensive hydrogen bonding ...

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“…The hydrolytic stability of the membranes was studied through proton conductivity measurement before and after immersing the membranes, with different DS, in 90 • C water for two weeks. Li et al [28] reported that the stability of proton conductivity is related to the acceptable hydrolytic stability. In this research, SPPO, SPEEK, and SPES with the DS less than 27%, 62%, and 40%, respectively, showed negligible loss in the proton conductivity.…”

Section: Resultsmentioning

confidence: 99%

Sulfonated Aromatic Polymers and Organically Modified Montmorillonite Nanocomposite Membranes for Fuel Cells Applications

Tohidian

Ghaffarian

Shakeri

et al. 2013

Journal of Macromolecular Science, Part B

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Aromatic polymers, such as sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) (SPPO), sulfonated poly(ether ether ketone) (SPEEK), and sulfonated poly(ether sulfone) (SPES), at the optimum degrees of sulfonation (DS), are suggested and evaluated as alternatives to Nafion for direct methanol fuel cells (DMFCs) applications. To reduce the methanol cross-over, which decreases the efficiency of the cell, organically modified montmorillonite nanoclays (OMMT) were added at 1 wt% to the sulfonated matrices with the optimum DS. The X-ray diffraction (XRD) patterns of nanocomposite membranes proved that the nanoclay layers were exfoliated. The proton conductivity and methanol permeability of the membranes, as well as the ion-exchange capacity (IEC), were measured. The selectivity parameter, ratio of proton conductivity to methanol permeability, was identified at 25 • C for the nanocomposite membranes and the results were compared with Nafion117. Finally, the DMFC performance tests were investigated at 70 • C and 5 M methanol feed for the manufactured nanocomposite polyelectrolyte membranes (PEMs). The SPEEK-based nanocomposite membrane showed the highest maximum power density in comparison with Nafion 117 and SPES and SPPO nanocomposite membranes. The results indicated that the nanocomposite membranes were promising PEMs for DMFC applications.

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Preparation of poly(vinyl phosphate-b-styrene) copolymers and its blend with PPO as proton exchange membrane for DMFC applications

Cited by 44 publications

References 32 publications

Structural modification of chitosan biopolymer as a novel polyelectrolyte membrane for green power generation

Structural modification of chitosan biopolymer as a novel polyelectrolyte membrane for green power generation

Cooperative Crystallization of Heterometallic Indium–Chromium Metal–Organic Polyhedra and Their Fast Proton Conductivity

Sulfonated Aromatic Polymers and Organically Modified Montmorillonite Nanocomposite Membranes for Fuel Cells Applications

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