Proton mobility in oligomer-bound proton solvents: imidazole immobilization via flexible spacers

Schuster, M.; Meyer, Wolfgang; Wegner, Gerhard; Herz, Hans‐Georg; Ise, Martin; Kreuer, Klaus‐Dieter; Maier, Joachim

doi:10.1016/s0167-2738(01)00917-1

Cited by 245 publications

(226 citation statements)

References 10 publications

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“…Some nitrogen containing heterocycles (e.g. imidazole) attached to small, fixed chains have also been studied, but no fuel cell data are available [3,[12][13][14][15]. In addition, efforts have been made to tether heterocycles like imidazole, 1H-1,2,3-triazole, and benzimidazole to alkyl polymer chains [16][17][18][19][20], but they are not ideal for high temperature PEMFC due to the low proton conductivity and poor stabilities of the alkyl backbones.…”

Section: Introductionmentioning

confidence: 99%

Blend membranes based on sulfonated poly(ether ether ketone) and polysulfone bearing benzimidazole side groups for proton exchange membrane fuel cells

Manthiram

Guiver

2006

Electrochemistry Communications

113

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Section: Introductionmentioning

confidence: 99%

Blend membranes based on sulfonated poly(ether ether ketone) and polysulfone bearing benzimidazole side groups for proton exchange membrane fuel cells

Manthiram

Guiver

2006

Electrochemistry Communications

113

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“…[33][34][35] Proton mobility in the electrolyte most likely depends on the distance between the hopping sites in the polymer material, [33][34][35] and usually, it is related to the activation energy of proton transfer under anhydrous condition. Several new polymers have been reported as possible electrolytes: polybenzimidazole(PBI)-acidic molecules, [49][50][51] imidazole group immobilized polymer-acidic molecules, [52][53][54][55][56] ionic liquid, [57][58][59][60] and inorganic-organic copolymers. 61 These electrolyte materials have high proton conductivity even under anhydrous and intermediate temperature conditions; however, some require the presence of liquid moieties, such as phosphoric or sulfuric acid solutions or an ionic liquid, to make proton conductivity high enough for the practical applications.…”

Section: Acid-base Composite Materialsmentioning

confidence: 99%

Bio-Inspired Membranes for Advanced Polymer Electrolyte Fuel Cells. Anhydrous Proton-Conducting Membrane via Molecular Self-Assembly

Honma¹,

Yamada²

2007

Bulletin of the Chemical Society of Japan

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Bio-inspired materials or natural biopolymers have attracted much attention for industrial applications as biocompatible materials. Although these materials have been discarded as industrial waste around the world, there is an increasing interest in environmental, engineering, and electrical applications of the biomaterials because of their well-controlled structures and superior conducting properties. The controlled structures of the hydrogen-bonding network in biomolecules, such as bioenergetic proteins, are essential for efficient energy transduction in living systems and application of a biomolecular mechanism could make it possible to prepare efficient electrolytes with superior conducting properties. We report here a recent investigation on the new class and new concept of electrolyte materials with bio-inspired molecular architectures of acid-base pairs for anhydrous proton conduction and its application in intermediate temperature C) polymer electrolyte fuel cells (PEFC). Although some membranes were composed from entirely biomolecular materials, they showed large anhydrous proton conductivities from room temperature to 160 C, and fuel cells employing biomembranes as a polymer electrolyte produced electrical power under non-humidified H 2 /O 2 condition at 160 C. These bio-inspired materials may have many potential applications not only because of its superior ion conducting properties, in particular, under anhydrous (water-free) or extremely low-humidity conditions, but also because of its biocompatibility.Increasing interest toward the global sustainable energy has occurred in relation to political, economical, and environmental protection aspects, whereas, from an industrial development point of view, advanced energy technology is becoming intensively important recently in ordered to reduce fossil fuel consumption and keep the environment clean for human activities. The Kyoto protocol has stimulated research activities in renewable energy technology in every nation and every industrial sector. Among them, polymer electrolyte fuel cells (PEFC) have been recognized as most promising energy conversion devices because they are much very efficient and emit less of CO 2 from automobile, terrestrial, and industrial power sources.

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“…Recently, nitrogencontaining heterocyclic compounds, such as imidazole, pyrazole and benzimidazole, have been suggested as proton solvents for proton exchange membrane fuel cells, and they may also be covalently tethered to some suitable polymers to prepare fully polymeric materials. [9][10][11][12][13][14][15][16][17][18] Liu et al 19 suggested that 1H-1,2,3-triazole has adequate electrochemical stability for fuel cell applications, and the 1H-1,2,3-triazole groups immobilized on a polymer backbone may open up new avenues in the design of polyelectrolytes. To date, several polymeric systems with tethered 1H-1,2,3-triazole moieties have been evaluated as polyelectrolytes.…”

Section: Introductionmentioning

confidence: 99%

Novel polyelectrolytes containing perfluorocyclobutane and triazole units: synthesis, characterization and properties

Zhu

Chen

2010

Polym J

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A new class of aryl trifluorovinyl ether monomers were designed and synthesized, and novel fluorinated polymers containing perfluorocyclobutane and 1H-1,2,3-triazole units were prepared from these monomers. These polymers were characterized by nuclear magnetic resonance spectroscopy, thermo-gravimetric analysis and differential scanning calorimetry. The temperatures of 5% weight loss of the polymers under nitrogen were up to B290 1C, and the glass transition temperatures of the polymers were in the range of 79-110 1C. These new polymers showed good solubility in common organic solvents such as dimethyl sulfoxide and N,N-dimethylacetamide. In addition, the proton conductivity of the polymers was measured under anhydrous conditions using impedance spectroscopy, and a maximum conductivity of 2.85 lS cm À1 was obtained at 200 1C.

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Proton mobility in oligomer-bound proton solvents: imidazole immobilization via flexible spacers

Cited by 245 publications

References 10 publications

Blend membranes based on sulfonated poly(ether ether ketone) and polysulfone bearing benzimidazole side groups for proton exchange membrane fuel cells

Blend membranes based on sulfonated poly(ether ether ketone) and polysulfone bearing benzimidazole side groups for proton exchange membrane fuel cells

Bio-Inspired Membranes for Advanced Polymer Electrolyte Fuel Cells. Anhydrous Proton-Conducting Membrane via Molecular Self-Assembly

Novel polyelectrolytes containing perfluorocyclobutane and triazole units: synthesis, characterization and properties

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