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A mechanistic study of metal sulfur batteries
Robert Dominko, Alen Vižintin, Sara Drvarič Talian, Ana Robba, Iztok Arčon, 2018, objavljeni povzetek znanstvenega prispevka na konferenci (vabljeno predavanje)

Ključne besede: Li-sulphur batteries, Sulphur XANES, magnesium
Objavljeno v RUNG: 15.10.2020; Ogledov: 2609; Prenosov: 0

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Role of Cu current collector on electrochemical mechanism of Mg–S battery
Ana Robba, Maja Mežnar, Alen Vižintin, Jan Bitenc, Jernej Bobnar, Iztok Arčon, Anna Randon-Vitanova, Robert Dominko, 2020, izvirni znanstveni članek

Opis: Development of magnesium sulfur battery is accompanied with all known difficulties present in Li–S batteries, however with even more limited choice of electrolytes. In the present work, the influence of current collector on electrochemical mechanism was investigated in light of different reports where improved behavior was ascribed to electrolyte. Notable differences in cycling behavior are reported when Al current collector is replaced by Cu current collector independent of electrolyte. The initial reduction of sulfur follows similar reaction path no mater of current collector, but formation of MgS can be in competition with formation of CuS in the presence of Cu cations. With the subsequent cycling cells prepared from cathodes deposited on Cu current collector show decrease in the voltage and formation of single plateau during cycling. The change corresponds to the involvement of Cu into the reaction and formation of redox couple Mg/CuS as determined by Cu K-edge XANES measurements. Corrosion of Cu foil is identified by SEM and serves as a source of Cu cations for the chemical reaction between Cu and polysulfides. Mg/CuS redox couple shows improved cycling stability, but theoretical energy density is severely reduced due to substitution of S with CuS as cathode active material.
Ključne besede: Magnesium Sulfur Rechargeable batteries Current collector Copper Corrosion
Objavljeno v RUNG: 16.01.2020; Ogledov: 3208; Prenosov: 0
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4.
Adding dimensions to the immersion testing of magnesium corrosion
Lars Wadsö, Dmytro Orlov, 2018, objavljeni znanstveni prispevek na konferenci

Ključne besede: magnesium, corrosion, isothermal calorimetry, pressure measurements
Objavljeno v RUNG: 11.03.2019; Ogledov: 3192; Prenosov: 0
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A Mechanistic Study of Magnesium Sulfur Batteries
Ana Robba, Alen Vižintin, Jan Bitenc, Gregor Mali, Iztok Arčon, Matjaž Kavčič, Matjaž Žitnik, Klemen Bučar, Giuliana Aquilanti, Charlotte Martineau-Corcos, Anna Randon-Vitanova, Robert Dominko, 2017, izvirni znanstveni članek

Opis: Magnesium sulfur batteries are considered as attractive energy storage devices due to the abundance of electrochemically active materials and high theoretical energy density. Here we report the mechanism of a Mg-S battery operation, which was studied in the presence of simple and commercially available salts dissolved in a mixture of glymes. The electrolyte offers high sulfur conversion into MgS in the first discharge with low polarization. The electrochemical conversion of sulfur with magnesium proceeds through two well-defined plateaus, which correspond to the equilibrium between sulfur and polysulfides (high-voltage plateau) and polysulfides and MgS (low-voltage plateau). As shown by XANES, RIXS and NMR studies, the end discharge phase involves MgS with Mg atoms in a tetrahedral environment resembling the wurtzite structure, while chemically synthesized MgS crystalizes in the rock-salt structure with octahedral coordination of magnesium.
Ključne besede: magnesium, sulfur, rechargeable batteries, XAS, NMR
Objavljeno v RUNG: 19.10.2017; Ogledov: 4631; Prenosov: 0
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7.
Atomic-level mechanisms of magnesium oxidation
Sandra Gardonio, Mattia Fanetti, Matjaž Valant, Dmytro Orlov, 2016, objavljeni znanstveni prispevek na konferenci

Opis: Magnesium has been recently becoming an increasingly popular material for various applications. However, excessive chemical reactivity, and oxidation rate in particular, is a major obstruction on the way of Mg to become widely adopted. A significant problem causing the lack of Mg reactivity control is insufficient understanding of mechanisms involved in the oxidation of magnesium surface. Herewith we present the investigation of atomic-level mechanisms of oxidation initiation and propagation in pure Mg. Namely, X-ray photoelectron spectroscopy at synchrotron Elettra was used as a surface sensitive direct method to determine the valence of Mg and O and the valence band states at the early stage of oxide formation over a principal, most densely packed, crystallographic plane (0001) in pure Mg. The mechanisms of oxygen adsorption on magnesium free surface followed by oxidation (i.e. initiation and kinetics of MgO formation) are clarified. Copyright © 2016 by The Minerals, Metals & Materials Society. All rights reserved.
Ključne besede: Magnesium, Oxidation, Synchrotron radiation, X-ray photoelectron spectroscopy
Objavljeno v RUNG: 25.08.2017; Ogledov: 5260; Prenosov: 0
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8.
Advances and Achievements in In Situ Analysis of Corrosion and Structure– Property Relationship in Mg Alloys
Dmytro Orlov, Vineet Joshi, 2016, predgovor, uvodnik, spremna beseda

Ključne besede: magnesium alloys, in-situ
Objavljeno v RUNG: 20.02.2017; Ogledov: 4536; Prenosov: 0
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