Special Issue "Hydrides: Science and Technology"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "Hydrogen Energy".

Deadline for manuscript submissions: 30 June 2020.

Special Issue Editor

Prof. Dr. Robert A. Varin
E-Mail Website
Guest Editor
Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON, Canada
Tel. 519-888-4567
Interests: nanostructured and amorphous materials for solid state hydrogen storage; nanostructure superconductors
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Special Issue Information

Dear Colleagues,

Since the late 1940s, the synthesis methodologies and properties of hydrides have attracted the attention of chemists, physicists and engineers. From a purely scientific point of view, hydrides constitute fascinating materials with diverse crystallographic structures and bonding characteristics, exhibiting a whole spectrum of unusual chemical and physical properties. For the past 20 years they have also attracted the attention of engineers since they have the potential for very efficient generation and storage of hydrogen in the solid state. For reversible hydrides, their dehydrogenation/rehydrogenation phenomenon is an example of energy transformation that may be utilized as either hydrogen or heat storage system. Dehydrogenation of irreversible hydrides can supply very clean hydrogen gas (H2) that is a potential energy carrier. Hydrogen gas is necessary for the implementation of the world-wide hydrogen economy in which an efficient usage of fuel cells where H2 in contact with oxygen (O2) is converted into an electrical energy. Engineering systems for supplying H2 to fuel cells in the future hydrogen economy, based on solid hydrides, are the most attractive long-term solution. However, solid state hydrogen storage in the most important automotive sector is extremely challenging and requires high H2 capacity (>11wt.%) hydride systems, capable of dehydrogenation at low temperatures (<100°C) under 1 bar H2 pressure and exhibiting reasonably fast “on-board” reversibility. Unfortunately, a hydride system suitable for automotive H2 storage has not yet been found. However, there are a number of other potential applications for H2 generation systems, such as portable electronic devices, stationary auxiliary power, off-road vehicles, portable electronics and others that may not require “on-board” reversibility. Recently, substantial research efforts have also been devoted to newly developing areas in the application of metal and complex hydrides for Li-ion batteries and electrochemical storage.

I cordially invite you to submit manuscripts on all the above and other related topics for this Special Issue "Hydrides: Science and Technology”. Both theoretical and experimental contributions are welcomed.

Prof. Dr. Robert A. Varin
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • metal hydrides
  • complex hydrides
  • nanocomposite hydride systems
  • confined hydrides
  • hydride ionic conductors
  • hydrides for rechargeable batteries (solid electrolytes and electrodes)
  • hydrides for solid state hydrogen generation and/or storage
  • hydrides for electrochemical hydrogen storage
  • engineering applications of hydrides
  • modelling
  • non-hydride materials for hydrogen storage

Published Papers (1 paper)

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Research

Open AccessFeature PaperArticle
Enhancement Effect of Bimetallic Amide K2Mn(NH2)4 and In-Situ Formed KH and Mn4N on the Dehydrogenation/Hydrogenation Properties of Li–Mg–N–H System
Energies 2019, 12(14), 2779; https://doi.org/10.3390/en12142779 - 19 Jul 2019
Cited by 2
Abstract
In this work, we investigated the influence of the K2Mn(NH2)4 additive on the hydrogen sorption properties of the Mg(NH2)2 + 2LiH (Li–Mg–N–H) system. The addition of 5 mol% of K2Mn(NH2)4 [...] Read more.
In this work, we investigated the influence of the K2Mn(NH2)4 additive on the hydrogen sorption properties of the Mg(NH2)2 + 2LiH (Li–Mg–N–H) system. The addition of 5 mol% of K2Mn(NH2)4 to the Li–Mg–N–H system leads to a decrease of the dehydrogenation peak temperature from 200 °C to 172 °C compared to the pristine sample. This sample exhibits a constant hydrogen storage capacity of 4.2 wt.% over 25 dehydrogenation/rehydrogenation cycles. Besides that, the in-situ synchrotron powder X-ray diffraction analysis performed on the as prepared Mg(NH2)2 + 2LiH containing K2Mn(NH2)4 indicates the presence of Mn4N. However, no crystalline K-containing phases were detected. Upon dehydrogenation, the formation of KH is observed. The presence of KH and Mn4N positively influences the hydrogen sorption properties of this system, especially at the later stage of rehydrogenation. Under the applied conditions, hydrogenation of the last 1 wt.% takes place in only 2 min. This feature is preserved in the following three cycles. Full article
(This article belongs to the Special Issue Hydrides: Science and Technology)
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