Electrochemical hydriding of nanocrystalline Mg-Ni-X (X = Co, Mn, Nd) alloys prepared by mechanical alloying and spark plasma sintering

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F17%3A43915361" target="_blank" >RIV/60461373:22310/17:43915361 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/j.jallcom.2017.08.059" target="_blank" >http://dx.doi.org/10.1016/j.jallcom.2017.08.059</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jallcom.2017.08.059" target="_blank" >10.1016/j.jallcom.2017.08.059</a>

Result language

angličtina

Original language name

Electrochemical hydriding of nanocrystalline Mg-Ni-X (X = Co, Mn, Nd) alloys prepared by mechanical alloying and spark plasma sintering

Original language description

In this work, MgNi26, MgNi26Mn10, MgNi26Co10 and MgNi26Nd10 alloys were prepared by mechanical alloying (MA) and subsequent spark plasma sintering (SPS). Mechanical alloying leads to a grain refinement and increases the concentration of lattice defects. SPS technology provides a compact material but with high porosity, consequently creating a high internal surface area within the volume of sample. The combination of the MA and SPS techniques produces a promising material in terms of fast hydriding kinetics and a high content of absorbed hydrogen. All samples were electrochemically hydrided in a 6 mol/L KOH solution at 80 degrees C for 480 min. The microstructures of the alloys were characterized by scanning electron microscopy and energy dispersive spectrometry. The phase compositions were characterized by X-ray diffraction, and the total hydrogen content in the hydrided pellets was measured using an inert gas fusion analyser. The dehydriding process was studied by thermogravimetry and mass spectrometry. The highest total amount of hydrogen was absorbed by the MgNi26Nd10 alloy, nearly 1.8 wt%. The main hydriding product was the binary hydride MgH2. The results of the mass spectrometry analysis reveal a significant reduction in the temperature of hydrogen evolution from magnesium hydride, probably due to the formation of fine microstructures of the hydrogenated alloys and catalytic effect of Ni. The decomposition temperature was reduced by more than 200 degrees C as compared to the commercial MgH2.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/GBP108%2F12%2FG043" target="_blank" >GBP108/12/G043: Interface controlled properties of micro/nanocrystalline materials for advanced structural applications, biodegradable implants and hydrogen storage</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Alloys and Compounds

ISSN

0925-8388

e-ISSN

—

Volume of the periodical

726

Issue of the periodical within the volume

December

Country of publishing house

US - UNITED STATES

Number of pages

9

Pages from-to

787-795

UT code for WoS article

000412606000097

EID of the result in the Scopus database

2-s2.0-85028352689