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A possible mechanism of formation of flower-like MgO/Mg(OH)2 structures by galvanostatic molten salt electrolysis: The concept of local diffusion fields

Samo za registrovane korisnike
2019
Autori
Cvetković, Vesna S.
Vukićević, Nataša
Nikolić, Nebojša D.
Baščarević, Zvezdana
Barudžija, Tanja S.
Jovićević, Jovan N.
Članak u časopisu (Objavljena verzija)
,
Elsevier
Metapodaci
Prikaz svih podataka o dokumentu
Apstrakt
The processes of electrodeposition from magnesium nitrate hexahydrate melt by galvanostatic regime of electrolysis have been analyzed. The structure of the formed particles was examined by X-ray diffraction (XRD), which revealed formation of MgO/Mg(OH)2 mixture by molten salt electrolysis. Morphologies of the produced deposits were characterized by scanning electron microscopy (SEM) technique. The flower-like forms constructed from very thin needles with sharp tips were predominately formed by electrodeposition at various current densities and with various amounts of electricity. Aside from that, holes formed from detached hydrogen bubbles of various shapes and sizes, from dish-like holes to those resulting in honeycomb-like structures were also observed. Mechanism of formation of the flower-like forms has been elucidated applying the general theory of disperse deposits formation which is based on the concept of local (spherical and cylindrical) diffusion fields. It is shown t...hat the growth of the needles occurs under the conditions of predominant spherical diffusion control, while the contribution of the cylindrical diffusion to the final shapes was negligible. Comparison with morphologies of deposits obtained by electrodepositions from aqueous magnesium salt electrolytes was also made and discussed.

Ključne reči:
Electrolysis / Magnesium oxide/magnesium hydroxide / The flower-like forms / Holes / SEM / XRD
Izvor:
Journal of Electroanalytical Chemistry, 2019, 842, 168-175
Izdavač:
  • Elsevier
Projekti:
  • Elektrohemijska sinteza i karakterizacija nanostrukturiranih funkcionalnih materijala za primenu u novim tehnologijama (RS-172046)
  • Nov pristup dizajniranju materijala za konverziju i skladištenje energije (RS-172060)

DOI: 10.1016/j.jelechem.2019.04.067

ISSN: 1572-6657

WoS: 000469907700021

Scopus: 2-s2.0-85065177700
[ Google Scholar ]
6
6
URI
http://cer.ihtm.bg.ac.rs/handle/123456789/3112
Kolekcije
  • Radovi istraživača / Researchers' publications
Institucija
IHTM
TY  - JOUR
AU  - Cvetković, Vesna S.
AU  - Vukićević, Nataša
AU  - Nikolić, Nebojša D.
AU  - Baščarević, Zvezdana
AU  - Barudžija, Tanja S.
AU  - Jovićević, Jovan N.
PY  - 2019
UR  - http://cer.ihtm.bg.ac.rs/handle/123456789/3112
AB  - The processes of electrodeposition from magnesium nitrate hexahydrate melt by galvanostatic regime of electrolysis
have been analyzed. The structure of the formed particles was examined by X-ray diffraction (XRD),
which revealed formation of MgO/Mg(OH)2 mixture by molten salt electrolysis. Morphologies of the produced
deposits were characterized by scanning electron microscopy (SEM) technique. The flower-like forms constructed
from very thin needles with sharp tips were predominately formed by electrodeposition at various
current densities and with various amounts of electricity. Aside from that, holes formed from detached hydrogen
bubbles of various shapes and sizes, from dish-like holes to those resulting in honeycomb-like structures were
also observed. Mechanism of formation of the flower-like forms has been elucidated applying the general theory
of disperse deposits formation which is based on the concept of local (spherical and cylindrical) diffusion fields.
It is shown that the growth of the needles occurs under the conditions of predominant spherical diffusion control,
while the contribution of the cylindrical diffusion to the final shapes was negligible. Comparison with
morphologies of deposits obtained by electrodepositions from aqueous magnesium salt electrolytes was also
made and discussed.
PB  - Elsevier
T2  - Journal of Electroanalytical Chemistry
T1  - A possible mechanism of formation of flower-like MgO/Mg(OH)2 structures by galvanostatic molten salt electrolysis: The concept of local diffusion fields
VL  - 842
SP  - 168
EP  - 175
DO  - 10.1016/j.jelechem.2019.04.067
ER  - 
@article{
author = "Cvetković, Vesna S. and Vukićević, Nataša and Nikolić, Nebojša D. and Baščarević, Zvezdana and Barudžija, Tanja S. and Jovićević, Jovan N.",
year = "2019",
url = "http://cer.ihtm.bg.ac.rs/handle/123456789/3112",
abstract = "The processes of electrodeposition from magnesium nitrate hexahydrate melt by galvanostatic regime of electrolysis
have been analyzed. The structure of the formed particles was examined by X-ray diffraction (XRD),
which revealed formation of MgO/Mg(OH)2 mixture by molten salt electrolysis. Morphologies of the produced
deposits were characterized by scanning electron microscopy (SEM) technique. The flower-like forms constructed
from very thin needles with sharp tips were predominately formed by electrodeposition at various
current densities and with various amounts of electricity. Aside from that, holes formed from detached hydrogen
bubbles of various shapes and sizes, from dish-like holes to those resulting in honeycomb-like structures were
also observed. Mechanism of formation of the flower-like forms has been elucidated applying the general theory
of disperse deposits formation which is based on the concept of local (spherical and cylindrical) diffusion fields.
It is shown that the growth of the needles occurs under the conditions of predominant spherical diffusion control,
while the contribution of the cylindrical diffusion to the final shapes was negligible. Comparison with
morphologies of deposits obtained by electrodepositions from aqueous magnesium salt electrolytes was also
made and discussed.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry",
title = "A possible mechanism of formation of flower-like MgO/Mg(OH)2 structures by galvanostatic molten salt electrolysis: The concept of local diffusion fields",
volume = "842",
pages = "168-175",
doi = "10.1016/j.jelechem.2019.04.067"
}
Cvetković VS, Vukićević N, Nikolić ND, Baščarević Z, Barudžija TS, Jovićević JN. A possible mechanism of formation of flower-like MgO/Mg(OH)2 structures by galvanostatic molten salt electrolysis: The concept of local diffusion fields. Journal of Electroanalytical Chemistry. 2019;842:168-175
Cvetković, V. S., Vukićević, N., Nikolić, N. D., Baščarević, Z., Barudžija, T. S.,& Jovićević, J. N. (2019). A possible mechanism of formation of flower-like MgO/Mg(OH)2 structures by galvanostatic molten salt electrolysis: The concept of local diffusion fields.
Journal of Electroanalytical ChemistryElsevier., 842, 168-175.
https://doi.org/10.1016/j.jelechem.2019.04.067
Cvetković Vesna S., Vukićević Nataša, Nikolić Nebojša D., Baščarević Zvezdana, Barudžija Tanja S., Jovićević Jovan N., "A possible mechanism of formation of flower-like MgO/Mg(OH)2 structures by galvanostatic molten salt electrolysis: The concept of local diffusion fields" 842 (2019):168-175,
https://doi.org/10.1016/j.jelechem.2019.04.067 .

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