Organic/inorganic nano-composites for high temperature proton conducting polymer electrolytes

Honma, Itaru; Nakajima, Hitoshi; Nishikawa, Osamu; Sugimoto, Tomosada; Nomura, S.

doi:10.1016/s0167-2738(03)00260-1

Cited by 121 publications

(57 citation statements)

References 25 publications

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“…The formation of SiO 2 agglomerates in the membrane with the highest PWA content is an expected phenomenon, related to the catalyst role of the heteropolyacid in the condensation process between the hydroxyl groups of the system. A similar phase separation was also observed by Honma et al [39] even if their materials were characterised by smaller agglomerates (50 nm). The same authors reported that condensation of the cross-linking silicate precursors occurred at PWA cluster surfaces, because of a particular affinity between SiO 2 and PWA itself [5].…”

Section: Pbi-based Composite Systemssupporting

confidence: 84%

Composite Proton‐Conducting Membranes for PEMFCs

et al. 2007

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Composite membranes are of interest for PEMFCs and DMFCs. This paper describes a basic study of the influence of silica on the proton conductivity: (i) added as a filler to poly(vinylidene fluoride‐hexafluoropropylene) and poly(benzimidazole)‐based membranes activated with H3PO4, or (ii) included in the matrix of class II hybrids based on tetraethoxysilane and poly(ethylene glycol) and activated with phosphotungstic acid (PWA).The addition of acidic silica as a filler determines proton conductivity increases up to one order of magnitude for filler amounts which strongly depend on the proton transport mechanism, and on the nature (free or partially free) of the activating acid. The increase of the silica content in the hybrid matrix induces a more complex behaviour which also depends on the amount of PWA.

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Section: Pbi-based Composite Systemssupporting

confidence: 84%

Composite Proton‐Conducting Membranes for PEMFCs

et al. 2007

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“…36 However, in a material with high conductivity, the semicircle passing decreases with the increase of conductivity 36 and the bulk resistance arise at the electrode/electrolyte interface. 16,37,38 In fact, the features of the Cole-Cole plots for the DNA-Im composite material are similar to that of a highly ionic conducting membrane, such as humidified Nafion 16 an organic/ inorganic hybrid membrane mixed with PWA, 37 or anhydrous proton conductors. 22,23,26,38 The resistances of the composite materials were obtained from the extrapolation to the real axis.…”

Section: Anhydrous Proton Conductive Measurements Of Dna-im Compositementioning

confidence: 80%

Proton conduction of DNA–imidazole composite material under anhydrous condition

Yamada

Goto

2012

Polym J

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Materials with high anhydrous proton conduction at intermediate temperatures (100-200 1C) have attracted remarkable interest for applications in a polymer electrolyte membrane fuel cell (PEMFC). Especially, for the development of PEMFC technology, an anhydrous proton-conductive material, which is low cost and benign for the environment, has been desired. In this study, an anhydrous proton conductor was prepared by mixing double-stranded DNA (dsDNA), the most important genetic material of living organisms, and the imidazole (Im) molecule, a heterocyclic molecule. This DNA-Im composite material showed a thermal stability owing to electrostatic interaction between the phosphate group of DNA and ÀN¼ group of the Im molecule. In addition, DNA-Im showed an anhydrous proton conduction of 5.2Â10 À3 S cm À1 at intermediate temperature. On the other hand, the single-stranded DNA-Im composite material did not show high anhydrous proton conduction. Therefore, the high anhydrous proton conduction in dsDNA-Im composite material was due to the arrangement of phosphate groups along the one-dimensional molecular chain. These results suggested that the DNA-Im composite material possesses two proton-conducting pathways in the composite material.

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“…The two main trends are either the control of the membrane microstructure or the preparation of composites (organic±inorganic composites, polymer blends, physical and/or chemical crosslinks,...). [8,9] One approach to control the morphology is the synthesis of block copolymers to enhance the phase separation and the mechanical properties. Nevertheless, the lack of structure-transport relationship understanding only permits a trial and error strategy.…”

Section: Introductionmentioning

confidence: 99%

Neutron and X‐ray Scattering: Suitable Tools for Studying Ionomer Membranes

2005

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Neutrons and x‐rays were extensively used to study the microstructure of the polymeric membranes for fuel cells. The small‐angle x‐ray and neutron scattering (SAXS and SANS resp.) data for Nafion® and alternative membranes present specific features. The different analyses and proposed models to interpret these data are reviewed. A special emphasis is devoted to the recent elongated polymer particle model which appears as the most efficient model for Nafion® to interpret not only the numerous scattering data but also the transport swelling and mechanical properties. Neutrons can also be used to study the water management in situ in an operating fuel cell either to visualise the water accumulation in the gas distributors or to determine the water concentration profiles through the membrane and during operation.

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Organic/inorganic nano-composites for high temperature proton conducting polymer electrolytes

Cited by 121 publications

References 25 publications

Composite Proton‐Conducting Membranes for PEMFCs

Composite Proton‐Conducting Membranes for PEMFCs

Proton conduction of DNA–imidazole composite material under anhydrous condition

Neutron and X‐ray Scattering: Suitable Tools for Studying Ionomer Membranes

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