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Special Issue "Hydrogen Storage Alloys"

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A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (31 August 2013)

Special Issue Editors

Guest Editor
Dr. Sammy Lap Ip Chan (Website)

School of Materials Sci. & Eng., University of New South Wales, Sydney, NSW 2052, Australia
Interests: energy-materials; hydrogen storage and metal matrix composites (MMCs)
Guest Editor
Prof. Dr. Kiyonori Suzuki (Website)

Department of Materials Engineering, Monash University, Room 163, Building 19, Clayton, Victoria 3800, Australia
Interests: magnetic materials; magnetic nanoparticles; amorphous alloys; hydrogen storage alloys; hydrogen permeation alloys

Special Issue Information

Dear Colleagues,

Storing hydrogen safely and efficiently is a key to realising a clean energy cycle free of carbon emission. Owing to the high volume density of hydrogen atoms in metal-hydrides which often exceeds the atomic density of liquid hydrogen, metal-hydride forming alloy systems have attracted much attention from the viewpoint of volume-efficient hydrogen storage. Among the hydrogen storage alloys developed to date, LaNi5 is perhaps the most commercially successful alloy and its derivatives have been used as the negative electrode in metal-nickel hydride rechargeable batteries. Although LaNi5 is an excellent electrode material with proven safety and long operational cycle life, the gravimetric capacity of hydrogen in LaNi5 is limited to approximately 1.4 wt%. This gravimetric capacity is way below the target set by the US Department of Energy for the onboard hydrogen storage system and thus, great efforts have been devoted to search for novel alloy systems with high gravimetric storage capacity. As a result, some new alloys based on Li, Mg and Ti have been reported since the late 1990s and the gravimetric storage capacity has been enhanced significantly. These alloys are generally intermetallic compounds that include, but not limited to AB, AB2, AB3 and A2B7, where A represents metallic elements with strong affinity for hydrogen, and B is metallic elements which regulate and catalytize the hydrogen absorption.  Hydrogen storage alloys are able to store the hydrogen in solid solution or hydride phase, depending on the nature and position of the elements in the intermetallic compounds. There has been also a growing awareness of the beneficial effects of nanoscale structural refinement on the absorption and desorption kinetics in hydrogen storage alloys. The aim of this special issue is to overview the current status of alloy development in hydrogen storage alloys and to discuss the fundamental understanding of the effects of alloying elements, the crystal structures and the microstructural refinement on the hydrogen storage characteristics.

Dr. Sammy Lap Ip Chan
Prof. Dr. Kiyonori Suzuki
Guest Editors

Submission

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. Papers will be published continuously (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as 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 refereed through a peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed Open Access monthly 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 1400 CHF (Swiss Francs).

Published Papers (3 papers)

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Research

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Open AccessArticle On the Nature of Voltammetric Signals Originating from Hydrogen Electrosorption into Palladium-Noble Metal Alloys
Materials 2013, 6(10), 4817-4835; doi:10.3390/ma6104817
Received: 28 August 2013 / Revised: 8 October 2013 / Accepted: 12 October 2013 / Published: 22 October 2013
Cited by 4 | PDF Full-text (1177 KB) | HTML Full-text | XML Full-text
Abstract
Hydrogen sorption/desorption signals observed on cyclic voltammograms in experiments on hydrogen electrosorption into Pd-noble metal alloys (Pd-Au, Pd-Pt, Pd-Rh, Pd-Ru, Pd-Pt-Rh, Pd-Pt-Au) were characterized. The influence of electrosorption potential, scan rate and alloy bulk composition on the features of the hydrogen peaks [...] Read more.
Hydrogen sorption/desorption signals observed on cyclic voltammograms in experiments on hydrogen electrosorption into Pd-noble metal alloys (Pd-Au, Pd-Pt, Pd-Rh, Pd-Ru, Pd-Pt-Rh, Pd-Pt-Au) were characterized. The influence of electrosorption potential, scan rate and alloy bulk composition on the features of the hydrogen peaks was investigated. The experimental results were compared with those obtained on the basis of a model taken from the literature. It was confirmed that the rate of the α-β phase transition controls the overall rate of the process of hydrogen absorption/desorption into/from thin Pd-based electrodes. It was demonstrated that from the analysis of the changes of the hydrogen oxidation peak potential with the hydrogen electrosorption potential in cyclic voltammetric experiments it is possible to determine the limiting Pd bulk content, below which the β-phase in the alloy-hydrogen system is not formed. Full article
(This article belongs to the Special Issue Hydrogen Storage Alloys)

Review

Jump to: Research

Open AccessReview Thermodynamic Tuning of Mg-Based Hydrogen Storage Alloys: A Review
Materials 2013, 6(10), 4654-4674; doi:10.3390/ma6104654
Received: 28 August 2013 / Revised: 26 September 2013 / Accepted: 12 October 2013 / Published: 18 October 2013
Cited by 27 | PDF Full-text (1257 KB) | HTML Full-text | XML Full-text
Abstract
Mg-based hydrides are one of the most promising hydrogen storage materials because of their relatively high storage capacity, abundance, and low cost. However, slow kinetics and stable thermodynamics hinder their practical application. In contrast to the substantial progress in the enhancement of [...] Read more.
Mg-based hydrides are one of the most promising hydrogen storage materials because of their relatively high storage capacity, abundance, and low cost. However, slow kinetics and stable thermodynamics hinder their practical application. In contrast to the substantial progress in the enhancement of the hydrogenation/dehydrogenation kinetics, thermodynamic tuning is still a great challenge for Mg-based alloys. At present, the main strategies to alter the thermodynamics of Mg/MgH2 are alloying, nanostructuring, and changing the reaction pathway. Using these approaches, thermodynamic tuning has been achieved to some extent, but it is still far from that required for practical application. In this article, we summarize the advantages and disadvantages of these strategies. Based on the current progress, finding reversible systems with high hydrogen capacity and effectively tailored reaction enthalpy offers a promising route for tuning the thermodynamics of Mg-based hydrogen storage alloys. Full article
(This article belongs to the Special Issue Hydrogen Storage Alloys)
Open AccessReview The Current Status of Hydrogen Storage Alloy Development for Electrochemical Applications
Materials 2013, 6(10), 4574-4608; doi:10.3390/ma6104574
Received: 30 August 2013 / Revised: 22 September 2013 / Accepted: 7 October 2013 / Published: 17 October 2013
Cited by 45 | PDF Full-text (791 KB) | HTML Full-text | XML Full-text
Abstract
In this review article, the fundamentals of electrochemical reactions involving metal hydrides are explained, followed by a report of recent progress in hydrogen storage alloys for electrochemical applications. The status of various alloy systems, including AB5, AB2, A [...] Read more.
In this review article, the fundamentals of electrochemical reactions involving metal hydrides are explained, followed by a report of recent progress in hydrogen storage alloys for electrochemical applications. The status of various alloy systems, including AB5, AB2, A2B7-type, Ti-Ni-based, Mg-Ni-based, BCC, and Zr-Ni-based metal hydride alloys, for their most important electrochemical application, the nickel metal hydride battery, is summarized. Other electrochemical applications, such as Ni-hydrogen, fuel cell, Li-ion battery, air-metal hydride, and hybrid battery systems, also have been mentioned. Full article
(This article belongs to the Special Issue Hydrogen Storage Alloys)

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