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

Authors

  • Nataša Vukićević ICTM-Department of Electrochemistry, University of Belgrade, Njegoševa 12, Belgrade
  • Vesna S. Cvetković ICTM-Department of Electrochemistry, University of Belgrade, Njegoševa 12, Belgrade
  • Nebojša D. Nikolić ICTM-Department of Electrochemistry, University of Belgrade, Njegoševa 12, Belgrade
  • Goran Branković Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1a, Belgrade
  • Jovan Jovićević ICTM-Department of Electrochemistry, University of Belgrade, Njegoševa 12, Belgrade

DOI:

https://doi.org/10.2298/JSC180913084V

Keywords:

electrolysis, magnesium nitrate melt, honeycomb-like structure, hydrogen evolution, scanning electron microscope (SEM)

Abstract

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 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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Published

2018-12-29

How to Cite

[1]
N. Vukićević, V. S. Cvetković, N. D. Nikolić, G. Branković, and J. Jovićević, “Formation of the honeycomb-like MgO/Mg(OH)2 structures with controlled shape and size of holes by molten salt electrolysis”, J. Serb. Chem. Soc., vol. 83, no. 12, pp. 1351-1362, Dec. 2018.

Issue

Section

Electrochemistry

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