Improvement of the Hydrogen-Storage Properties of Mg by Adding a Polymer CMC via Transformation-Involving Milling
Journal Title: Materials Science-Medžiagotyra - Year 2019, Vol 25, Issue 2
Abstract
The addition of CMC (Carboxymethylcellulose, Sodium Salt) may improve the hydrogen uptake-release properties of Mg since it has a relatively low melting point and the melting of CMC during transformation-involving milling may make the milled samples be in the good states to absorb and release hydrogen rapidly. Samples with compositions of 95 w/o Mg + 5 w/o CMC (named Mg-5CMC) were made through transformation-involving milling. Mg-5CMC was activated in about 3 hydrogen uptake-release cycles. After activation, Mg-5CMC had a higher beginning hydrogen uptake rate and a larger amount of hydrogen absorbed in 60 min, U (60 min), than milled Mg. At the third cycle (CN = 3), Mg-5CMC had a very high beginning hydrogen uptake rate (1.45 w/o H/min) and a very large U (60 min) (7.18 w/o H), showing that the activated Mg-5CMC has an effective hydrogen-storage capacity of about 7.2 w/o at 593 K in hydrogen of 12 bar at CN = 3. Mg-5CMC after transformation-involving milling contained Mg and very small amounts of β-MgH2 and MgO, with no evidence of the phases related to CMC. The milling in hydrogen of Mg with CMC is believed to fabricate defects and cracks and lessen the particle size. To the best of our knowledge, this study is the first one in which a polymer CMC is added to Mg by transformation-involving milling to improve the hydrogen uptake-release properties of Mg.
Authors and Affiliations
Eunho CHOI, Young Jun KWAK, Myoung Youp SONG
Keywords
Related Articles
- EP ID EP581471
- DOI 10.5755/j01.ms.25.2.20009
- Views 56
- Downloads 0
Influence of Heat Treatment on the Static Bending Strength of Spruce Wood
The goal of this investigation was to find out influence of heat treatment at low temperatures on the Lithuanian spruce wood bending strength. The influence of heating temperature and duration on the strength of spruce w...
Biodegradation of Wood Treated with Copper Based Preservative by Two Dematiaceous Fungi: Alternaria Tenuissima and Ulocladium Consortiale
As cases of treated wood colonization by fungi still happen, the understanding of fungal survival abilities could contribute in the creation of new efficient preservatives. For that reason, two dematiaceous fungi Alterna...
The Influences of SiO2 on the Sintering Behavior and the Properties of Na+-β/β"-Al2O3 Solid Electrolyte
SiO2-doped Na+-β/β″-Al2O3 was synthesized via a solid-state reaction, and the relationship between the SiO2 content and properties of Na+-β/β″-Al2O3 was investigated. Respective specimens were doped with 0 – 5 wt.% SiO2...
First-principles Calculation of the Electronic Structure and Optical Properties of ZnO Co-doped with Nb and Ta
First-principle calculations have been performed to investigate the electronic structure and optical properties of ZnO co-doped with Nb and Ta. The three doping structures are set to: Zn0.9375Nb0.0625O, Zn0.9375Ta0.0625O...
Performance Characteristics of Hot-dip and Plasma Spray Aluminide Coated Nickel-Based Superalloy 718 under Cyclic Oxidation in Water Vapour
Aluminium coating due to its ability to form stable alumina oxide scale are commonly used to protect materials such as inconel 718 superalloys at high operational temperatures. Relevant properties of the oxide scale form...