scholarly journals Ionic conductivity in complex metal hydride-based nanocomposite materials: The impact of nanostructuring and nanocomposite formation

2021 ◽  
pp. 163474
Author(s):  
Laura M. de Kort ◽  
Valerio Gulino ◽  
Petra E. de Jongh ◽  
Peter Ngene
Keyword(s):  
Ionic Conductivity ◽  
Metal Hydride ◽  
Nanocomposite Materials ◽  
Complex Metal ◽  
The Impact

Ionic conductivity in nanocrystalline Gd doped ceria

2008 ◽  
Vol 1122 ◽  
Author(s):  
Gianguido Baldinozzi ◽  
David Simeone ◽  
Dominique Gosset ◽  
Mickael Dollé ◽  
Georgette Petot-Ervas
Keyword(s):  
Grain Size ◽  
Ionic Conductivity ◽  
Sol Gel ◽  
Doped Ceria ◽  
Narrow Size Distribution ◽  
Conductivity Measurements ◽  
X Ray Diffraction ◽  
X Ray ◽  
Grain Sizes ◽  
The Impact

AbstractWe have synthesized Gd-doped ceria polycrystalline samples (5, 10, 15 %mol), having relative densities exceeding 95% and grain sizes between 30 and 160 nm after axial hot pressing (750 °C, 250 MPa). The samples were prepared by sintering nanopowders obtained by sol-gel chemistry methods having a very narrow size distribution centered at about 16 nm. SEM and X-ray diffraction were performed to characterize the sample microstructures and to assess their structures. We report ionic conductivity measurements using impedance spectroscopy. It is important to investigate the properties of these systems with sub-micrometric grains and as a function of their composition. Therefore, samples having micrometric and nanometric grain sizes (and different Gd content) were studied. Evidence of Gd segregation near the grain boundaries is given and the impact on the ionic conductivity, as a function of the grain size and Gd composition, is discussed and compared to microcrystalline samples.

CONDUCTIVITY AND DIELECTRIC BEHAVIOR OF PLiAMPS-BASED SEMI-IPN SINGLE ION CONDUCTOR PLASTICIZED WITH POLY(SILOXANE-G-ETHYLENE OXIDE)

2012 ◽  
Vol 02 (03) ◽  
pp. 1250017
Author(s):  
WEIWEI CUI ◽  
DONGYAN TANG
Keyword(s):  
Dielectric Constant ◽  
Ionic Conductivity ◽  
Ethylene Oxide ◽  
Polymer Network ◽  
Dielectric Behavior ◽  
Interpenetrating Polymer Network ◽  
Segmental Mobility ◽  
Ion Conductor ◽  
Conductivity Variation ◽  
The Impact

Comb poly(siloxane-g-ethylene oxide) (PSi-PE) with high chain segmental mobility, as a plasticizer, was introduced into poly(lithium 2-acrylamido-2-methyl-1-propanesulfonate) (PLiAMPS)-based semi-interpenetrating polymer network single-ion conductors. The structures of PSi-PE and PLiAMPS were characterized by FTIR spectroscopy. The distribution of PSi-PE in polyelectrolyte matrix was investigated through observing the residual surface morphology of conductor membrane after being etched by toluene. AC impedance and dielectric behavior measurements were used to investigate the impact of PSi-PE on the ionic conductivity and to analyze the mechanism of conductivity variation. Compared with the unplasticized membranes, the ionic conductivity of the membrane with the addition of 35 wt.% PSi-PE was improved by 20 times. Meanwhile, the dielectric constant (ε) of the membrane was increased to 1330 and the relaxation time was decreased to 0.012 s. The changes of dielectric properties reflect directly the effect of PSi-PE on the dissociation ability of Li+ and the chain segmental mobility, which well explains the reasons of ionic conductivity variation.

LaMg2PdH7, a new complex metal hydride containing tetrahedral [PdH4]4− anions

2007 ◽  
Vol 446-447 ◽  
pp. 34-38 ◽  
Author(s):  
K. Yvon ◽  
J.-Ph. Rapin ◽  
N. Penin ◽  
Zhu Ma ◽  
M.Y. Chou
Keyword(s):  
Metal Hydride ◽  
Complex Metal

scholarly journals Hydrogen storage in complex metal hydrides

2009 ◽  
Vol 74 (2) ◽  
pp. 183-196 ◽  
Author(s):  
Borislav Bogdanovic ◽  
Michael Felderhoff ◽  
Guido Streukens
Keyword(s):  
Fuel Cells ◽  
Solid State ◽  
Thermodynamic Properties ◽  
Hydrogen Storage ◽  
Sodium Borohydride ◽  
Metal Hydride ◽  
Metal Hydrides ◽  
Hydrogen Storage Materials ◽  
High Hydrogen ◽  
Complex Metal

Complex metal hydrides such as sodium aluminohydride (NaAlH4) and sodium borohydride (NaBH4) are solid-state hydrogen-storage materials with high hydrogen capacities. They can be used in combination with fuel cells as a hydrogen source thus enabling longer operation times compared with classical metal hydrides. The most important point for a wide application of these materials is the reversibility under moderate technical conditions. At present, only NaAlH4 has favorable thermodynamic properties and can be employed as a thermally reversible means of hydrogen storage. By contrast, NaBH4 is a typical non-reversible complex metal hydride; it reacts with water to produce hydrogen.

scholarly journals The impact of metal hydride material activation to storage percentage of hydrogen in this material

2020 ◽  
Vol 8 (1) ◽  
pp. 25-31
Author(s):  
Lubica Bednarova ◽  
Tomáš Brestovič ◽  
Natália Jasmisnká ◽  
Marián Lázár ◽  
Romana Dobáková ◽  
...  
Keyword(s):  
Metal Hydride ◽  
Alternative Energy ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
Absorption Process ◽  
Absorption Properties ◽  
High Pressure And Temperature ◽  
Alternative Energy Sources ◽  
The World ◽  
The Impact

Currently, a lot of focus is dedicated to metal hydride alloy and options of their utilization. Mankind must solve energy problems due to constant population growth and use of non-renewable energy sources. The World resources of oil are limited and therefore the mankind must start utilizing the alternative energy sources for example hydrogen. Its known that the hydrogen can be stored by metal hydride alloys what it represents the safety way of storage with absence high pressure and temperature. The process by produce of the alloy with good absorption properties the research does not end. Some alloy absorbs the hydrogen after they produce immediately, however a lot of them need the activation for improvement or starting absorption process. Process of activation is very important for achieving the maximum capacity at moderate temperature.

scholarly journals Exploring Aliovalent Substitutions in the Lithium Halide Superionic Conductor Li3-xIn1-xZrxCl6 (0 ≤ X ≤ 0.5)

2021 ◽  
Author(s):  
Bianca Helm ◽  
Roman Schlem ◽  
Bjöern Wankmiller ◽  
Ananya Banik ◽  
Ajay Gautam ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Three Dimensional ◽  
Lithium Ion ◽  
Ion Diffusion ◽  
Cation Site ◽  
Diffusion Channel ◽  
Cation Disorder ◽  
Site Disorder ◽  
The Impact ◽  
Lithium Ion Diffusion

<p>In recent years, ternary halides Li<sub>3</sub><i>MX</i><sub>6</sub> (<i>M</i> = Y, Er, In; <i>X</i> = Cl, Br, I) have garnered attention as solid electrolytes due to their wide electrochemical stability window and favorable room-temperature conductivities. In this material class, the influences of iso- or aliovalent substitutions are so far rarely studied in-depth, despite this being a common tool for correlating structure and transport properties. In this work, we investigate the impact of Zr substitution on the structure and ionic conductivity of Li<sub>3</sub>InCl<sub>6</sub> (Li<sub>3-<i>x</i></sub>In<sub>1-<i>x</i></sub>Zr<i><sub>x</sub></i>Cl<sub>6</sub> with 0 ≤ <i>x</i> ≤ 0.5) using a combination of neutron diffraction, nuclear magnetic resonance and impedance spectroscopy. Analysis of high-resolution diffraction data shows the presence of an additional tetrahedrally coordinated lithium position together with cation site-disorder, both of which have not been reported previously for Li<sub>3</sub>InCl<sub>6</sub>. This Li<sup>+</sup> position and cation disorder lead to the formation of a three-dimensional lithium ion diffusion channel, instead of the expected two-dimensional diffusion. Upon Zr<sup>4+</sup> substitution, the structure exhibits non-uniform volume changes along with an increasing number of vacancies, all of which lead to an increasing ionic conductivity in this series of solid solutions.</p>

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