Formation of needle-like and honeycomb-like magnesium oxide/hydroxide structures by electrodeposition from magnesium nitrate melts

Cvetković, Vesna S.; Vukićević, Nataša M.; Nikolić, Nebojša D.; Branković, Goran; Barudžija, Tanja; Jovićević, Jovan N.

doi:10.1016/j.electacta.2018.02.121

Cited by 29 publications

(32 citation statements)

References 51 publications

(103 reference statements)

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“…In the anodic scan, there were no current waves which would indicate the oxidation complementary to the two cathodic current waves. Thеsе recordings were in a very good agreement with our previous results, obtained on GC electrode in the same melt [7][8][9][10] where starting potential has been E s = 1.400 V vs. Mg/Mg 2+ .…”

Section: Resultssupporting

confidence: 89%

“…In contrast to the experimental conditions applied in our earlier work, 8,10 in linear sweep voltammetry experiments (LSV), the potential was swept from starting potential, E S, being 0.000 V to a final cathodic potential, E C, of -1.000 V vs. Mg/Mg 2+ , and back to E S . Experiments under the potentiostatic regime were carried out at: -0.200 V vs. Mg/Mg 2+ , -0.700 V vs. Mg/Mg 2+ and -1.000 V vs. Mg/Mg 2+ applied to the working electrode at T = 373 K. Also, in all electrodeposition processes, the deposition charges were limited to 2 C. After electrolysis, the working electrode was taken out from the cell, rinsed with absolute ethanol (Zorka--Pharma, Šabac, Serbia) and dried at room temperature.…”

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confidence: 99%

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Formation of the honeycomb-like MgO/Mg(OH)2 structures with controlled shape and size of holes by molten salt electrolysis

Vukićević¹,

Cvetković²,

Nikolić³

et al. 2018

JSCS

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Synthesis of the honeycomb-like MgO/Mg(OH) 2 structures, with controlled shape and size of holes, by the electrolysis from magnesium nitrate hexahydrate melt onto glassy carbon is presented. The honeycomb-like structures were made up of holes, formed from detached hydrogen bubbles, surrounded by walls, built up of thin intertwined needles. For the first time, it was shown that the honeycomb-like structures can be obtained by molten salt electrolysis and not exclusively by electrolysis from aqueous electrolytes. Analogies with the processes of the honeycomb-like metal structures formation from aqueous electrolytes are presented and discussed. Rules established for the formation of these structures from aqueous electrolytes, such as the increase of number of holes, the decrease of holes size and coalescence of neighbouring hydrogen bubbles observed with increasing cathodic potential, appeared to be valid for the electrolysis of the molten salt used.

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Section: Resultssupporting

confidence: 89%

mentioning

confidence: 99%

Formation of the honeycomb-like MgO/Mg(OH)2 structures with controlled shape and size of holes by molten salt electrolysis

Vukićević¹,

Cvetković²,

Nikolić³

et al. 2018

JSCS

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“…The XRD analysis of products of molten salt electrolysis of magnesium nitrate hexahydrate showed that the mixture of MgO/Mg(OH)2 was formed [39,40]. The network of the intertwined needles was formed in the UPD (underpotential) region (Fig.…”

Section: Molten Salt Electrolysismentioning

confidence: 99%

“…The hole size decreased, while their number increased with increasing the overpotential of electrodeposition (13c and d). [39].…”

Section: Molten Salt Electrolysismentioning

confidence: 99%

“…In spite of vigorous hydrogen evolution accompanied by formation of numerous holes from the detached hydrogen bubbles (the both dish-like holes and those constructing the honeycomb-like structures) [39], formation of very long needles of MgO/Mg(OH)2 clearly indicates that this molten salt electrolysis process belongs to the very fast electrochemical process.…”

Section: Figure 14 the Polarization Curves For Pb Ag Zn And Cu Normentioning

confidence: 99%

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Influence of the exchange current density and overpotential for hydrogen evolution reaction on the shape of electrolytically produced disperse forms - Review

Nikolić¹

2020

J. Electrochem. Sci. Eng.

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In this study, comprehensive survey of formation of disperse forms by the electrolysis from aqueous electrolytes and molten salt electrolysis has been presented. The shape of electrolitically formed disperse forms primarily depends on the nature of metals, determined by the exchange current density (j0) and overpotential for hydrogen evolution reaction as a parallel reaction to metal electrolysis. The decrease of the j0 value leads to a change of shape of dendrites from the needle-like and the 2D fern-like dendrites (metals characterized by high j0 values) to the 3D pine-like dendrites (metals characterized by medium j0 values). The appearing of a strong hydrogen evolution leads to formation of cauliflower-like and spongy-like forms (metals characterized by medium and low j0 values). The other disperse forms, such as regular and irregular crystals, granules, cobweb-like, filaments, mossy and boulders, usually feature metals characterized by the high j0 values. The globules and the carrot-like forms are a characteristic of metals with the medium j0 values. The very long needles were a product of molten salt electrolysis of magnesium nitrate hexahydrate. Depending on the shape of the disperse forms, i.e. whether they are formed without and with vigorous hydrogen evolution, formation of all disperse forms can be explained by either application of the general theory of disperse deposits formation or the concept of "effective overpotential". With the decrease of j0 value, the preferred orientation of the disperse forms changed from the strong (111) in the needle-like and the fern-like dendrites to randomly oriented crystallites in the 3D pine-like dendrites and the cauliflower-like and the spongy-like forms.

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Ultra‐Fine Nano‐Mg(OH)₂ Electrodeposited in Flexible Confined Space and its Enhancement of the Performance of LiFePO₄ Lithium‐Ion Batteries

Huang,

Zhang,

Zhang

et al. 2023

Adv Funct Materials

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To improve the Li‐ion diffusion and extreme‐environment performance of LiFePO4 (LFP) lithium‐ion batteries, a composite cathode material is fabricated using ultra‐fine nano‐Mg(OH)2 (MH). First, a flexible confined space is designed in the local area of the cathode surface, through the transition of charged xanthan gum polymer molecules under electric field force and the self‐assembly of the xanthan gum network. Then, the 20 nm nano‐Mg(OH)2 is prepared through cathodic electrodeposition within the local flexible confined space, and subsequent in situ surface modification as it traverses the xanthan gum network under gravity. LFP‐MH significantly changes the density and homogeneity of the cathode electrolyte interphase film and improves the electrolyte affinity. The Li||LFP‐MH half‐cell demonstrates excellent rate capability (110 mAh g−1 at 5 C) and long‐term cycle performance (116.6 mAh g−1 at 1 C after 1000 cycles), and maintains over 100 mAh g−1 after 150 cycles at 60 °C, as well as no structural collapse of the cathode material after 400 cycles at 5 V high cut‐off voltage. The cell also shows an obvious decrease in inner resistance after 100 cycles (99.53/133.12 Ω). This work provides a significant advancement toward LiFePO4 lithium‐ion batteries with excellent electrochemical performance and tolerance to extreme‐environment.

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Formation of needle-like and honeycomb-like magnesium oxide/hydroxide structures by electrodeposition from magnesium nitrate melts

Cited by 29 publications

References 51 publications

Formation of the honeycomb-like MgO/Mg(OH)2 structures with controlled shape and size of holes by molten salt electrolysis

Formation of the honeycomb-like MgO/Mg(OH)2 structures with controlled shape and size of holes by molten salt electrolysis

Influence of the exchange current density and overpotential for hydrogen evolution reaction on the shape of electrolytically produced disperse forms - Review

Ultra‐Fine Nano‐Mg(OH)₂ Electrodeposited in Flexible Confined Space and its Enhancement of the Performance of LiFePO₄ Lithium‐Ion Batteries

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Formation of needle-like and honeycomb-like magnesium oxide/hydroxide structures by electrodeposition from magnesium nitrate melts

Cited by 29 publications

References 51 publications

Formation of the honeycomb-like MgO/Mg(OH)2 structures with controlled shape and size of holes by molten salt electrolysis

Formation of the honeycomb-like MgO/Mg(OH)2 structures with controlled shape and size of holes by molten salt electrolysis

Influence of the exchange current density and overpotential for hydrogen evolution reaction on the shape of electrolytically produced disperse forms - Review

Ultra‐Fine Nano‐Mg(OH)2 Electrodeposited in Flexible Confined Space and its Enhancement of the Performance of LiFePO4 Lithium‐Ion Batteries

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Ultra‐Fine Nano‐Mg(OH)₂ Electrodeposited in Flexible Confined Space and its Enhancement of the Performance of LiFePO₄ Lithium‐Ion Batteries