Proton conducting ceramics and their applications

Iwahara, Hiroyasu

doi:10.1016/0167-2738(96)00087-2

Cited by 386 publications

(208 citation statements)

References 29 publications

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“…Using to this equation, the value of E a for proton transfer in the acid-base composite materials was estimated to be 0.22-0.34 eV. These values are almost one order of magnitude higher than the proton conduction in the Nafion Ò membrane, 70,71 and almost the same as other anhydrous proton conductors, such as solid oxides electrolytes 33,[72][73][74] and fullerene derivatives. 75,76 The value of this activation energy suggests that proton transport in the acid-base composite materials is not assisted by the liquid-like motion of vehicular molecules, but occurs directly in the solid-state matrix.…”

Section: Acid-base Composite Materialsmentioning

confidence: 91%

“…This value is almost the same as for other materials reported as anhydrous single proton conductors. 33,62,63,[72][73][74][75][76]83 These results indicated that the protontransporting mechanism in UI-MDP composite material with lamellar structure is, perhaps, not a vehicular mechanism with a diffusible carrier molecules, such as…”

Section: Self-assembled Proton Conductormentioning

confidence: 99%

“…Additionally, we have tested the long-term thermal stability of the materials and found a conductivity greater than 10 À3 S cm À1 was maintained at 160 C for 2 days. Therefore, binary zwitterionic-type molecular solids can be recognized as a thermostable proton-conducting materials, which can be distinguished from other very anhydrous proton conductors, like metal oxides 33,[72][73][74] or inorganic materials, [85][86][87][88] such as perovskite-type oxides or super protonic conductor, CsHSO 4 , reported so far. 84 The E a for proton transfer in the PS-MP composite materials was estimated from the slope of Arrhenius plots.…”

mentioning

confidence: 99%

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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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Section: Acid-base Composite Materialsmentioning

confidence: 91%

Section: Self-assembled Proton Conductormentioning

confidence: 99%

mentioning

confidence: 99%

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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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“…A linear Arrhenius behavior was observed between 25 C and 110 C, and the calculated value of the activation energy for the proton transfer process resulted to be 0.41 eV, in agreement with a proton hopping mechanism. [24][25][26][27][28] To verify the membrane stability under controlled humidified condition, the membrane proton conductivity was measured as a function of RH. Figure 7 show the data recorded at 60 C, 80 C, and 100 C at different RH.…”

Section: Composite Polymeric Membrane In Pemfcmentioning

confidence: 99%

Sulphonated poly ether ether ketone/amino‐diphenylsilandiol composite electrolyte for PEM fuel cells

Ahmed

Belitto²,

Vona³

et al. 2011

J of Applied Polymer Sci

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A composite polymeric membrane to be used as electrolyte in polymer electrolyte membrane fuel cells has been prepared and characterized. The membrane is composed of an acidic polymer, sulfonated polyetheretherketone, and of basic filler, amino-diphenylsilandiol, a functionalized organically modified silane. Attenuated total reflectance (ATR)/fourier transform infrared spectroscopy (FTIR) demonstrated the occurrence of a specific interaction of the polymer ASO 3 H groups with the basic function of the filler. Such interaction reflected in reduced swelling, enhanced thermal stability, and good proton conductivity values at intermediate temperatures (r % 10 À2 S cm À1 at 100 C).

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“…Oxygen-transport membranes based on mixed conductors are being developed for oxygen purification and for coupling with steam reforming reactions in the production of synthesis gas [1]. Oxides with perovskite structures similar to those of oxygen conductors but with immobile oxygen anions can also exhibit protonic or mixed protonic-electronic conductivity, without significant oxygen transport, in hydrogen or water atmospheres [2,3]. Such materials have been less extensively studied than oxygen conductors, but they can be used to extract H 2 from streams in the presence of chemical or electrochemical potential gradients.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Proton-Conducting Oxides as Hydrogen Transport Membranes

Iglesia

2001

Natural Gas Conversion VI

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The hydrogen permeation properties of dense SrCe 0.95 Yb 0.05 O 3-x membranes were examined under various conditions and described based on the conductivities of available charge carriers using a transport model for mixed conductors. The chemical environment on each side of the membrane influences not only the chemical potential driving force for transport but also the conductivities of the various charge carriers. When one side of the membrane is exposed to oxidizing atmosphere, the H 2 flux is limited by hole conduction. In reducing atmosphere, SrCe 0.95 Yb 0.05 O 3-x membranes show electron conductivity and the electron transference number increases with increasing H 2 partial pressure. The hydrogen flux-current behavior during electrochemical pumping is caused by an insulatorsemiconductor transition that occurs with increasing applied voltage.

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Proton conducting ceramics and their applications

Cited by 386 publications

References 29 publications

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

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

Sulphonated poly ether ether ketone/amino‐diphenylsilandiol composite electrolyte for PEM fuel cells

Synthesis and Characterization of Proton-Conducting Oxides as Hydrogen Transport Membranes

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