Solid State Ionics

Items from 1 to 19 out of 19 results

article

The absorption and locking-in of hydrogen in copper

K.C. Waugh

Solid State Ionics > 2004 > 168 > 3-4 > 327-342

The mechanism of methanol synthesis from a CO/CO ₂ /H ₂ feed over a Cu/ZnO/Al ₂ O ₃ catalyst is reviewed. It is shown that it is the CO ₂ component of the gas stream which forms the methanol and that Cu metal is the active component of the catalyst. The CO ₂ is shown to adsorb dissociatively on the Cu forming a surface oxide which on further CO ₂...

article

The most probable trajectory for ion flux through large-pore channel

S. Bransburg-Zabary, E. Nachliel, M. Gutman

Solid State Ionics > 2004 > 168 > 3-4 > 235-243

Large-pore channels are β-barrel proteins that transverse the bacterial outer membrane, forming partially selective pores that are ~50 A long and ~30 A wide. Through these proteins, whose structures were determined up to 2 A resolution, small solutes permeate into the periplasmic space of the bacteria.In the present study, we investigated the propagation of ions inside the channel space using a combination...

article

Hydrogen motion in oxides: from insulators to bronzes

M. Stanley Whittingham

Solid State Ionics > 2004 > 168 > 3-4 > 255-263

The understanding of the diffusion of hydrogen is critical to a number of technologies, such as electrochromics, fuel cells and sensors, as well as in the study of corrosion/embrittlement phenomena. The motion of hydrogen species is reviewed here by comparing three different systems. First, the mobility of the counter-ions in the insulating naturally occurring silicates, exemplified by vermiculite,...

article

Hydrogen in rare earths: a wealth of structural and electronic phenomena

P. Vajda

Solid State Ionics > 2004 > 168 > 3-4 > 271-279

After discussing a typical R-H phase diagram, some relevant examples are selected, from (i) the α*-RH _x solid solution, (ii) the superstoichiometric β-RH ₂ ₊ _x dihydride, and (iii) the substoichiometric RH ₃ _- _x trihydride phase. Thus, in (i) we show the influence of hydrogen upon the magnetism of Er and discuss the possible origin of the uni-dimensional configuration...

article

Editorial Board

Solid State Ionics > 2004 > 168 > 3-4 > CO2

article

Hydrogen on and in carbon nanostructures

G. Seifert

Solid State Ionics > 2004 > 168 > 3-4 > 265-269

The interaction of hydrogen with carbon nanostructures (nanotubes-CNT, fullerenes) are discussed on the basis of density-functional based tight-binding calculations. The structural and electronic properties of hydrogenated fullerenes (C ₆ ₀ -H) and nanotubes (CNT-H) are described. The adsorption and penetration of molecular hydrogen (H ₂ ) through the carbon network of the fullerenes...

article

Adiabatic and nonadiabatic proton transfer rate constants in solution

Philip M. Kiefer, James T. Hynes

Solid State Ionics > 2004 > 168 > 3-4 > 219-224

Here we briefly review some nontraditional theoretical views developed in this group on acid-base proton transfer (PT) reactions AH...B->A ^- ...HB ⁺ in solution, whose key ingredients are inclusion of the quantum character of the proton motion, the identification of a solvent coordinate as the reaction coordinate, and attention to the AB hydrogen bond in the reacting pair. The reaction...

article

Hydrogen-bonding interactions of photoacids: correlation of optical solvatochromism with IR absorption spectra

B.-Z. Magnes, D. Pines, N. Strashnikova, E. Pines

Solid State Ionics > 2004 > 168 > 3-4 > 225-233

The effect of specific hydrogen-bonding interactions on the electronic spectra and the infrared (IR) absorption spectra of several naphthol-type photoacids was investigated. A correlation between the pK _a * of the photoacid and its optical solvatochromism was observed for R*O H...B-type hydrogen bonds using the Kamlet-Taft (K-T) analysis. In addition, a correlation between the spectral shift...

article

Author index to volume 168

Solid State Ionics > 2004 > 168 > 3-4 > 343-344

article

Preface

Klaus-Dieter Kreuer, Joachim Maier, Wolfgang Meyer

Solid State Ionics > 2004 > 168 > 3-4 > vii

article

Global instability index optimizations for the localization of mobile protons

Stefan Adams, Olaf Moretzki, Enric Canadell

Solid State Ionics > 2004 > 168 > 3-4 > 281-290

A method for the automatized localization of proton sites in a crystal structure and of probable proton transport pathways is developed from a slightly modified bond valence (BV) concept that in contrast to conventional parameter sets accounts for the polarizabilities of the interacting particles. The method is tested for several recent structure determinations of inorganic solids with mobile protons...

article

Subject index to volume 168

Solid State Ionics > 2004 > 168 > 3-4 > 345-346

article

Prospect of hydrogen technology using proton-conducting ceramics

Hiroyasu Iwahara, Yamato Asakura, Koji Katahira, Masahiro Tanaka

Solid State Ionics > 2004 > 168 > 3-4 > 299-310

This paper reviews possible hydrogen devices using a proton-conducting ceramic and describes the prospect of hydrogen technology utilizing these devices. Solid-state protonic devices can be classified into two categories: the devices utilizing electromotive force (EMF) and the ones utilizing preferential transport of protons. Galvanic cell type hydrogen sensors and fuel cells belong to the former,...

article

Concerning the origin of superstructures in hydrogen molybdenum bronzes H _x MoO ₃

Damián A. Scherlis, Young Joo Lee, Carme Rovira, Stefan Adams, more

Solid State Ionics > 2004 > 168 > 3-4 > 291-298

The possible relationship between the superstructures in hydrogen molybdenum bronzes and charge density wave (CDW)-type instabilities of their Fermi surface (FS) is analyzed. It is shown that, depending on structural details, two-dimensional, one-dimensional and quite localized bands can be in competition at the bottom of the t ₂ _g -block band structure changing the shape of the FS. It...

article

The phenomena of dielectric saturation in the water domains of polymer electrolyte membranes

R. Paul, S.J. Paddison

Solid State Ionics > 2004 > 168 > 3-4 > 245-248

A statistical mechanical formalism is presented for the calculation of the thermodynamic property of the permittivity of the water in the water and ion containing domains of polymer electrolyte membranes, with particular emphasis on the polarization. The present work differs from previous work in that the electric field due to the dissociated acidic groups (i.e. -SO ₃ H) of the polymer is...

article

Molecular dynamics simulation of the effect of nanoparticle fillers on ion motion in a polymer host

H. Kasemägi, A. Aabloo, M.K. Klintenberg, J.O. Thomas

Solid State Ionics > 2004 > 168 > 3-4 > 249-254

There is some empirical evidence to show that proton conductivity in a polymer host (typically Nafion(C)) can be enhanced by the addition of nanoparticle ''fillers''. The possible underlying mechanism(s) involved in such an effect is here probed by Molecular Dynamics (MD) simulation not for proton conductivity, but for lithium-ion conductivity in the system LiX.(PEO) _n , where ''PEO''=amorphous...

article

Proton-conducting polymer membranes in fuel cells-humidification aspects

B. Andreaus, G.G. Scherer

Solid State Ionics > 2004 > 168 > 3-4 > 311-320

The characteristics of water balance in the solid polymer electrolyte and its effects on the performance of a polymer electrolyte fuel cell are investigated by means of electrochemical impedance spectroscopy (EIS) and current pulse method (CPM). At high current densities, the water content on the anode side of the electrolyte decreases due to electroosmotic drag and the limited backtransport properties...

article

Instructions to Authors

Solid State Ionics > 2004 > 168 > 3-4 > CO3

article

Thermodynamic analysis of the electrochemical promotion of catalysis

C.G. Vayenas

Solid State Ionics > 2004 > 168 > 3-4 > 321-326

The phenomenon of electrochemical promotion of catalysis (EPOC) or non-Faradaic electrochemical modification of catalytic activity (NEMCA effect) with O ² ^- conductors is analyzed from a thermodynamic point of view. It is shown that thermodynamics dictates the existence of two oxygen species on the catalyst-electrode surface, one which can, under certain conditions, be equilibrated with...

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Volume:
168
Year:
2004

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Keywords

BOND VALENCE METHOD (1)
CARBON NANOSTRUCTURES (1)
CATALYSIS (1)
CHARGE DENSITY WAVES (1)
COPPER (1)
DIELECTRIC CONSTANT (1)
DIELECTRIC SATURATION (1)
ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY (1)
ELECTROCHEMICAL PROMOTION (1)
ELECTROSTATIC POTENTIAL (1)
FERMI SURFACE (1)
FREE ENERGY RELATIONS (1)
FULLERENES (1)
GEMINATE RECOMBINATION (1)
HUMIDIFICATION (1)
HYDROGEN (1)
HYDROGEN ABSORPTION (1)
HYDROGEN BONDS (1)
HYDROGEN MOLYBDENUM BRONZE (1)
HYDROGEN PUMP (1)
HYDROGEN SENSOR (1)
HYDROGEN STORAGE (1)
IR ABSORPTION SPECTRA (1)
KINETIC ISOTOPE EFFECTS (1)
LARGE-PORE CHANNEL (1)
LI-ION MOBILITY (1)
LOW-DIMENSIONAL MIXED CONDUCTORS (1)
MAGNETISM (1)
METAL-INSULATOR TRANSITIONS (1)
MOLECULAR DYNAMICS (1)
MOLYBDENUM BRONZES (1)
MOST PROBABLE TRAJECTORY (1)
NAFION(R) (1)
NANOPARTICLE FILLERS (1)
NANOTUBES (1)
NUCLEAR FUSION REACTOR (1)
OPTICAL SOLVATOCHROMISM (1)
ORDER/DISORDER (1)
PHOTOACID (1)
POLYMER ELECTROLYTE FUEL CELL (1)
POLYMER ELECTROLYTES (1)
PROTON (1)
PROTON CONDUCTORS (1)
PROTON DIFFUSION (1)
PROTON TRANSFER (1)
PROTON-CONDUCTING CERAMIC (1)
RARE EARTHS (1)
STATISTICAL MECHANICS (1)
STEAM ELECTROLYZER (1)
THERMODYNAMICS (1)
TRANSITION METAL OXIDE (1)
TRANSPORT (1)
TUNGSTEN BRONZES (1)
TUNNELING (1)
VERMICULITE (1)
WATER (1)
WATER BALANCE (1)
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