Characterization of Mg2NiH4 type hydrides by TEM. (2022)

• Record Type: Journal Article
• Authors: Grigorova, Eli; Markov, Pavel; Nihtianova, Diana
• Is Part Of: Materials today. Volume 61:Part 4(2022)
• Page Start: 1233
• Page End: 1236
• Publication Date: 2022
• Subjects: Hydrogen storage -- Mg2NiH4 hydride -- Ball milling -- TEM characterization; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2022.01.376
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: Mixtures of corresponding metals with composition 95 wt% Mg2.05 Ni0.7 V0.3 and Mg2.1 Ni0.7 V0.3 and with addition of 5 wt% of activated carbon derived from apricot stones are prepared by ball milling under argon atmosphere. The received mixtures are tested for their hydrogen sorption characteristics at different temperatures. TEM characterization of these materials poses some challenges, because of their sensitivity to oxidation and the high energy of the electron beam exposure, which could cause negative impact. After hydriding at 300 °C and 1 MPa TEM results (SAED, HRTEM) showed the following phase composition: monoclinic and orthorhombic Mg2 NiH4, MgO, VHx and graphite for both samples.