TY  - JOUR
AU  - Cvetković, Vesna S.
AU  - Feldhaus, Dominic
AU  - Vukićević, Nataša M.
AU  - Milićević-Neumann, Ksenija
AU  - Barudžija, Tanja
AU  - Friedrich, Bernd
AU  - Jovićević, Jovan N.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10416
AB  - The impact of rare earth oxide (REO) concentration on the deposition process and selective recovery of the metal being deposited from a molten fluoride salt system was investigated by applying deposition of Nd and Pr and varying the concentration of REO added to the electrolyte. A ternary phase diagram for the liquidus temperature of the NdF3-PrF3-LiF system was constructed to better predict the optimal electrolyte constitution. Cyclic voltammetry was used to record three redox signals, reflecting the processes involving Nd(III)/Nd and Pr(III)/Pr transformations. A two-step red/ox process for Nd(III) ions and a single-step red/ox process for Pr(III) ions were confirmed by square-wave voltammetry. The cyclic voltammetry results indicated the possibility of neodymium and praseodymium co-deposition. In order to sustain higher co-deposition rates on the cathode and to avoid increased production of PFC greenhouse gases on the anode, a low-overpotential deposition technique was used for Nd and Pr electrodeposition from the electrolyte with varying Nd2O3 and Pr6O11 concentrations. Co-deposited neodymium and praseodymium metals were characterized by electron probe microanalysis (EPMA) and X-ray diffraction (XRD) analysis. After electrodeposition, concentration profiles of neodymium and praseodymium were recorded, starting from the cathode surface towards the electrolyte bulk. The working temperature of 1050 °C of the molten fluoride salt basic electrolyte, in line with the constructed phase diagram, was validated by improved co-deposition and led to a more effective deposition process.
T2  - Metals
T1  - Influence of Rare Earth Oxide Concentration on Electrochemical
Co-Deposition of Nd and Pr from NdF3-PrF3-LiF Based Melts
VL  - 12
IS  - 7
SP  - 1204
DO  - 10.3390/met12071204
ER  - 

@article{
author = "Cvetković, Vesna S. and Feldhaus, Dominic and Vukićević, Nataša M. and Milićević-Neumann, Ksenija and Barudžija, Tanja and Friedrich, Bernd and Jovićević, Jovan N.",
year = "2022",
abstract = "The impact of rare earth oxide (REO) concentration on the deposition process and selective recovery of the metal being deposited from a molten fluoride salt system was investigated by applying deposition of Nd and Pr and varying the concentration of REO added to the electrolyte. A ternary phase diagram for the liquidus temperature of the NdF3-PrF3-LiF system was constructed to better predict the optimal electrolyte constitution. Cyclic voltammetry was used to record three redox signals, reflecting the processes involving Nd(III)/Nd and Pr(III)/Pr transformations. A two-step red/ox process for Nd(III) ions and a single-step red/ox process for Pr(III) ions were confirmed by square-wave voltammetry. The cyclic voltammetry results indicated the possibility of neodymium and praseodymium co-deposition. In order to sustain higher co-deposition rates on the cathode and to avoid increased production of PFC greenhouse gases on the anode, a low-overpotential deposition technique was used for Nd and Pr electrodeposition from the electrolyte with varying Nd2O3 and Pr6O11 concentrations. Co-deposited neodymium and praseodymium metals were characterized by electron probe microanalysis (EPMA) and X-ray diffraction (XRD) analysis. After electrodeposition, concentration profiles of neodymium and praseodymium were recorded, starting from the cathode surface towards the electrolyte bulk. The working temperature of 1050 °C of the molten fluoride salt basic electrolyte, in line with the constructed phase diagram, was validated by improved co-deposition and led to a more effective deposition process.",
journal = "Metals",
title = "Influence of Rare Earth Oxide Concentration on Electrochemical
Co-Deposition of Nd and Pr from NdF3-PrF3-LiF Based Melts",
volume = "12",
number = "7",
pages = "1204",
doi = "10.3390/met12071204"
}

Cvetković, V. S., Feldhaus, D., Vukićević, N. M., Milićević-Neumann, K., Barudžija, T., Friedrich, B.,& Jovićević, J. N.. (2022). Influence of Rare Earth Oxide Concentration on Electrochemical
Co-Deposition of Nd and Pr from NdF3-PrF3-LiF Based Melts. in Metals, 12(7), 1204.
https://doi.org/10.3390/met12071204

Cvetković VS, Feldhaus D, Vukićević NM, Milićević-Neumann K, Barudžija T, Friedrich B, Jovićević JN. Influence of Rare Earth Oxide Concentration on Electrochemical
Co-Deposition of Nd and Pr from NdF3-PrF3-LiF Based Melts. in Metals. 2022;12(7):1204.
doi:10.3390/met12071204 .

Cvetković, Vesna S., Feldhaus, Dominic, Vukićević, Nataša M., Milićević-Neumann, Ksenija, Barudžija, Tanja, Friedrich, Bernd, Jovićević, Jovan N., "Influence of Rare Earth Oxide Concentration on Electrochemical
Co-Deposition of Nd and Pr from NdF3-PrF3-LiF Based Melts" in Metals, 12, no. 7 (2022):1204,
https://doi.org/10.3390/met12071204 . .

TY  - JOUR
AU  - Cvetković, Vesna S.
AU  - Feldhaus, Dominic
AU  - Vukićević, Nataša M.
AU  - Barudžija, Tanja
AU  - Friedrich, Bernd
AU  - Jovićević, Jovan N.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9947
AB  - Electrodeposition processes of neodymium and praseodymium in molten NdF3 + PrF3 + LiF + 1 wt.%Pr6O11 + 1 wt.%Nd2O3 and NdF3 + PrF3 + LiF + 2 wt.%Pr6O11 + 2 wt.%Nd2O3 electrolytes at 1323 K were investigated. Cyclic voltammetry, square wave voltammetry, and open circuit potentiometry were applied to study the electrochemical reduction of Nd(III) and Pr(III) ions on Mo and W cathodes. It was established that a critical condition for Nd and Pr co-deposition in oxyfluoride electrolytes was a constant praseodymium deposition overpotential of ≈−0.100 V, which was shown to result in co-deposition current densities approaching 6 mAcm−2 . Analysis of the results obtained by applied electrochemical techniques showed that praseodymium deposition proceeds as a one-step process involving exchange of three electrons (Pr(III)→Pr(0)) and that neodymium deposition is a two-step process: the first involves one electron exchange (Nd(III)→Nd(II)), and the second involves an exchange of two electrons (Nd(II)→Nd(0)). X-ray diffraction analyses confirmed the formation of metallic Nd and Pr on the working substrate. Keeping the anodic potential to the glassy carbon working anode low results in very low levels of carbon oxides, fluorine and fluorocarbon gas emissions, which should qualify the studied system as an environmentally friendly option for rare earth metal deposition. The newly reported data for Nd and Pr metals co-deposition provide valuable information for the recycling of neodymium-iron-boron magnets.
T2  - Metals
T1  - Electrochemical study of Nd and Pr co-deposition onto Mo and W from molten oxyfluorides
VL  - 11
IS  - 9
SP  - 1494
DO  - 10.3390/met11091494
ER  - 

@article{
author = "Cvetković, Vesna S. and Feldhaus, Dominic and Vukićević, Nataša M. and Barudžija, Tanja and Friedrich, Bernd and Jovićević, Jovan N.",
year = "2021",
abstract = "Electrodeposition processes of neodymium and praseodymium in molten NdF3 + PrF3 + LiF + 1 wt.%Pr6O11 + 1 wt.%Nd2O3 and NdF3 + PrF3 + LiF + 2 wt.%Pr6O11 + 2 wt.%Nd2O3 electrolytes at 1323 K were investigated. Cyclic voltammetry, square wave voltammetry, and open circuit potentiometry were applied to study the electrochemical reduction of Nd(III) and Pr(III) ions on Mo and W cathodes. It was established that a critical condition for Nd and Pr co-deposition in oxyfluoride electrolytes was a constant praseodymium deposition overpotential of ≈−0.100 V, which was shown to result in co-deposition current densities approaching 6 mAcm−2 . Analysis of the results obtained by applied electrochemical techniques showed that praseodymium deposition proceeds as a one-step process involving exchange of three electrons (Pr(III)→Pr(0)) and that neodymium deposition is a two-step process: the first involves one electron exchange (Nd(III)→Nd(II)), and the second involves an exchange of two electrons (Nd(II)→Nd(0)). X-ray diffraction analyses confirmed the formation of metallic Nd and Pr on the working substrate. Keeping the anodic potential to the glassy carbon working anode low results in very low levels of carbon oxides, fluorine and fluorocarbon gas emissions, which should qualify the studied system as an environmentally friendly option for rare earth metal deposition. The newly reported data for Nd and Pr metals co-deposition provide valuable information for the recycling of neodymium-iron-boron magnets.",
journal = "Metals",
title = "Electrochemical study of Nd and Pr co-deposition onto Mo and W from molten oxyfluorides",
volume = "11",
number = "9",
pages = "1494",
doi = "10.3390/met11091494"
}

Cvetković, V. S., Feldhaus, D., Vukićević, N. M., Barudžija, T., Friedrich, B.,& Jovićević, J. N.. (2021). Electrochemical study of Nd and Pr co-deposition onto Mo and W from molten oxyfluorides. in Metals, 11(9), 1494.
https://doi.org/10.3390/met11091494

Cvetković VS, Feldhaus D, Vukićević NM, Barudžija T, Friedrich B, Jovićević JN. Electrochemical study of Nd and Pr co-deposition onto Mo and W from molten oxyfluorides. in Metals. 2021;11(9):1494.
doi:10.3390/met11091494 .

Cvetković, Vesna S., Feldhaus, Dominic, Vukićević, Nataša M., Barudžija, Tanja, Friedrich, Bernd, Jovićević, Jovan N., "Electrochemical study of Nd and Pr co-deposition onto Mo and W from molten oxyfluorides" in Metals, 11, no. 9 (2021):1494,
https://doi.org/10.3390/met11091494 . .

TY  - JOUR
AU  - Cvetković, Vesna S.
AU  - Vukićević, Nataša M.
AU  - Feldhaus, Dominic
AU  - Milićević-Neumann, Ksenija
AU  - Barudžija, Tanja
AU  - Friedrich, Bernd
AU  - Jovićević, Jovan N.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9522
AB  - The Al-V alloys were synthetized by potentiostatic electrodeposition onto a glassy carbon electrode from equimolar AlCl3 + NaCl bath containing vanadium ions at 200 °C. The alloy deposits were characterized by X-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy. The deposits were identified as Al3V and AlV3 alloys. It was found that intermetallic alloys were synthetized during aluminium underpotential deposition onto vanadium metal that was previously deposited on the glassy carbon electrode by diffusion-controlled overpotential deposition. Alloys were the result of solid-state interdiffusion between the initially deposited vanadium and the subsequently deposited aluminium. As a source to secure a constant concentration of vanadium in the electrolyte during deposition, vanadium anodic dissolution, and VCl3 melt addition were studied. The effect of vanadium ion concentration in the electrolyte on the composition and the surface morphology of the obtained deposits was investigated. The results indicate that controlled vanadium and aluminium codeposition could be a further step to the successful development of an advanced technology for Al3V and AlV3 alloy synthesis.
T2  - Metals
T1  - Electrodeposition of Aluminium-Vanadium Alloys from Chloroaluminate Based Molten Salt Containing Vanadium Ions
VL  - 11
IS  - 1
SP  - 123
DO  - 10.3390/met11010123
ER  - 

@article{
author = "Cvetković, Vesna S. and Vukićević, Nataša M. and Feldhaus, Dominic and Milićević-Neumann, Ksenija and Barudžija, Tanja and Friedrich, Bernd and Jovićević, Jovan N.",
year = "2021",
abstract = "The Al-V alloys were synthetized by potentiostatic electrodeposition onto a glassy carbon electrode from equimolar AlCl3 + NaCl bath containing vanadium ions at 200 °C. The alloy deposits were characterized by X-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy. The deposits were identified as Al3V and AlV3 alloys. It was found that intermetallic alloys were synthetized during aluminium underpotential deposition onto vanadium metal that was previously deposited on the glassy carbon electrode by diffusion-controlled overpotential deposition. Alloys were the result of solid-state interdiffusion between the initially deposited vanadium and the subsequently deposited aluminium. As a source to secure a constant concentration of vanadium in the electrolyte during deposition, vanadium anodic dissolution, and VCl3 melt addition were studied. The effect of vanadium ion concentration in the electrolyte on the composition and the surface morphology of the obtained deposits was investigated. The results indicate that controlled vanadium and aluminium codeposition could be a further step to the successful development of an advanced technology for Al3V and AlV3 alloy synthesis.",
journal = "Metals",
title = "Electrodeposition of Aluminium-Vanadium Alloys from Chloroaluminate Based Molten Salt Containing Vanadium Ions",
volume = "11",
number = "1",
pages = "123",
doi = "10.3390/met11010123"
}

Cvetković, V. S., Vukićević, N. M., Feldhaus, D., Milićević-Neumann, K., Barudžija, T., Friedrich, B.,& Jovićević, J. N.. (2021). Electrodeposition of Aluminium-Vanadium Alloys from Chloroaluminate Based Molten Salt Containing Vanadium Ions. in Metals, 11(1), 123.
https://doi.org/10.3390/met11010123

Cvetković VS, Vukićević NM, Feldhaus D, Milićević-Neumann K, Barudžija T, Friedrich B, Jovićević JN. Electrodeposition of Aluminium-Vanadium Alloys from Chloroaluminate Based Molten Salt Containing Vanadium Ions. in Metals. 2021;11(1):123.
doi:10.3390/met11010123 .

Cvetković, Vesna S., Vukićević, Nataša M., Feldhaus, Dominic, Milićević-Neumann, Ksenija, Barudžija, Tanja, Friedrich, Bernd, Jovićević, Jovan N., "Electrodeposition of Aluminium-Vanadium Alloys from Chloroaluminate Based Molten Salt Containing Vanadium Ions" in Metals, 11, no. 1 (2021):123,
https://doi.org/10.3390/met11010123 . .

TY  - JOUR
AU  - Cvetković, Vesna S.
AU  - Vukićević, Nataša
AU  - Feldhaus, Dominic
AU  - Barudžija, Tanja
AU  - Stevanović, Jasmina
AU  - Friedrich, Bernd
AU  - Jovićević, Jovan J.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9073
AB  - Electrochemical reduction processes of Nd(III) on tungsten and molybdenum electrodes in NdF3+LiF and NdF3+LiF+Nd2O3 were investigated by cyclic voltammetry, chronoamperometry and open circuit measurements. Electrolytes and electrodes were examined after neodymium electrodeposition by optical microscopy and XRD. It was found that tungsten and molybdenum working electrodes behave identically during neodymium complexed ion reduction processes. Their reversible potentials in the electrolytes used differed only by 10 mV, and so did the potentials of the neodymium ion reduction processes. The recorded results indicated that the Nd(III) ions in the melts were reduced in two steps: Nd(III) → Nd(II) and Nd(II) → Nd(0). These consecutive processes are predominantly mass transfer controlled. Electrolytically obtained metal appeared to accumulate on the cathode and no metal neodymium was recorded in the solidified electrolyte placed close to the cathode after completed electrodeposition process. However, it was found that NdF2 formed by the disproportionation reaction between Nd(III) and that deposited Nd(0) coexists with other complex components in the electrolytes used.
T2  - International Journal of Electrochemical Science
T1  - Study of Nd deposition onto W and Mo Cathodes from Molten Oxide-Fluoride Electrolyte
VL  - 15
IS  - 7
SP  - 7039
EP  - 7052
DO  - 10.20964/2020.07.82
ER  - 

@article{
author = "Cvetković, Vesna S. and Vukićević, Nataša and Feldhaus, Dominic and Barudžija, Tanja and Stevanović, Jasmina and Friedrich, Bernd and Jovićević, Jovan J.",
year = "2020",
abstract = "Electrochemical reduction processes of Nd(III) on tungsten and molybdenum electrodes in NdF3+LiF and NdF3+LiF+Nd2O3 were investigated by cyclic voltammetry, chronoamperometry and open circuit measurements. Electrolytes and electrodes were examined after neodymium electrodeposition by optical microscopy and XRD. It was found that tungsten and molybdenum working electrodes behave identically during neodymium complexed ion reduction processes. Their reversible potentials in the electrolytes used differed only by 10 mV, and so did the potentials of the neodymium ion reduction processes. The recorded results indicated that the Nd(III) ions in the melts were reduced in two steps: Nd(III) → Nd(II) and Nd(II) → Nd(0). These consecutive processes are predominantly mass transfer controlled. Electrolytically obtained metal appeared to accumulate on the cathode and no metal neodymium was recorded in the solidified electrolyte placed close to the cathode after completed electrodeposition process. However, it was found that NdF2 formed by the disproportionation reaction between Nd(III) and that deposited Nd(0) coexists with other complex components in the electrolytes used.",
journal = "International Journal of Electrochemical Science",
title = "Study of Nd deposition onto W and Mo Cathodes from Molten Oxide-Fluoride Electrolyte",
volume = "15",
number = "7",
pages = "7039-7052",
doi = "10.20964/2020.07.82"
}

Cvetković, V. S., Vukićević, N., Feldhaus, D., Barudžija, T., Stevanović, J., Friedrich, B.,& Jovićević, J. J.. (2020). Study of Nd deposition onto W and Mo Cathodes from Molten Oxide-Fluoride Electrolyte. in International Journal of Electrochemical Science, 15(7), 7039-7052.
https://doi.org/10.20964/2020.07.82

Cvetković VS, Vukićević N, Feldhaus D, Barudžija T, Stevanović J, Friedrich B, Jovićević JJ. Study of Nd deposition onto W and Mo Cathodes from Molten Oxide-Fluoride Electrolyte. in International Journal of Electrochemical Science. 2020;15(7):7039-7052.
doi:10.20964/2020.07.82 .

Cvetković, Vesna S., Vukićević, Nataša, Feldhaus, Dominic, Barudžija, Tanja, Stevanović, Jasmina, Friedrich, Bernd, Jovićević, Jovan J., "Study of Nd deposition onto W and Mo Cathodes from Molten Oxide-Fluoride Electrolyte" in International Journal of Electrochemical Science, 15, no. 7 (2020):7039-7052,
https://doi.org/10.20964/2020.07.82 . .

TY  - JOUR
AU  - Cvetković, Vesna S.
AU  - Feldhaus, Dominic
AU  - Vukićević, Nataša
AU  - Barudžija, Tanja
AU  - Friedrich, Bernd
AU  - Jovićević, Jovan N.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8971
AB  - Neodymium was electrochemically deposited from NdF3–LiF–Nd2O3 molten salt electrolyte onto the Mo electrode at temperatures close to 1273 K. Cyclic voltammetry and chronoamperometry measurements were the applied electrochemical methods. Metallic neodymium is obtained by potentiostatic deposition. The optical microscopy and XRD were used to analyze the electrolyte, the working electrode surface, and the deposit on the electrode. It was established that Nd(III) ions were reduced to Nd metals in two steps: Nd(III) + e− → Nd(II) at potential ≈−0.55 V vs. W and Nd(II) + 2e− → Nd(0) at ≈−0.83 V vs. W. Both of these processes are reversible and under mass transfer control. Upon deposition under the regime of relatively small deposition overpotential of −0.10 V to −0.20 V, and after the electrolyte was cooled off, Nd metal was observed at the surface of the Mo electrode. CO and CF4 were gases registered as being evolved at the anode. CO and CF4 evolution were observed in quantities below 600 ppm and 10 ppm, respectively
T2  - Metals
T1  - Investigation on the Electrochemical Behaviour and Deposition Mechanism of Neodymium in NdF3–LiF–Nd2O3 Melt on Mo Electrode
VL  - 10
IS  - 5
SP  - 576
DO  - 10.3390/met10050576
ER  - 

@article{
author = "Cvetković, Vesna S. and Feldhaus, Dominic and Vukićević, Nataša and Barudžija, Tanja and Friedrich, Bernd and Jovićević, Jovan N.",
year = "2020",
abstract = "Neodymium was electrochemically deposited from NdF3–LiF–Nd2O3 molten salt electrolyte onto the Mo electrode at temperatures close to 1273 K. Cyclic voltammetry and chronoamperometry measurements were the applied electrochemical methods. Metallic neodymium is obtained by potentiostatic deposition. The optical microscopy and XRD were used to analyze the electrolyte, the working electrode surface, and the deposit on the electrode. It was established that Nd(III) ions were reduced to Nd metals in two steps: Nd(III) + e− → Nd(II) at potential ≈−0.55 V vs. W and Nd(II) + 2e− → Nd(0) at ≈−0.83 V vs. W. Both of these processes are reversible and under mass transfer control. Upon deposition under the regime of relatively small deposition overpotential of −0.10 V to −0.20 V, and after the electrolyte was cooled off, Nd metal was observed at the surface of the Mo electrode. CO and CF4 were gases registered as being evolved at the anode. CO and CF4 evolution were observed in quantities below 600 ppm and 10 ppm, respectively",
journal = "Metals",
title = "Investigation on the Electrochemical Behaviour and Deposition Mechanism of Neodymium in NdF3–LiF–Nd2O3 Melt on Mo Electrode",
volume = "10",
number = "5",
pages = "576",
doi = "10.3390/met10050576"
}

Cvetković, V. S., Feldhaus, D., Vukićević, N., Barudžija, T., Friedrich, B.,& Jovićević, J. N.. (2020). Investigation on the Electrochemical Behaviour and Deposition Mechanism of Neodymium in NdF3–LiF–Nd2O3 Melt on Mo Electrode. in Metals, 10(5), 576.
https://doi.org/10.3390/met10050576

Cvetković VS, Feldhaus D, Vukićević N, Barudžija T, Friedrich B, Jovićević JN. Investigation on the Electrochemical Behaviour and Deposition Mechanism of Neodymium in NdF3–LiF–Nd2O3 Melt on Mo Electrode. in Metals. 2020;10(5):576.
doi:10.3390/met10050576 .

Cvetković, Vesna S., Feldhaus, Dominic, Vukićević, Nataša, Barudžija, Tanja, Friedrich, Bernd, Jovićević, Jovan N., "Investigation on the Electrochemical Behaviour and Deposition Mechanism of Neodymium in NdF3–LiF–Nd2O3 Melt on Mo Electrode" in Metals, 10, no. 5 (2020):576,
https://doi.org/10.3390/met10050576 . .

TY  - JOUR
AU  - Cvetković, Vesna S.
AU  - Vukićević, Nataša M.
AU  - Nikolić, Nebojša D.
AU  - Baščarević, Zvezdana D.
AU  - Barudžija, Tanja
AU  - Jovićević, Jovan N.
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S1572665719303315
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8176
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. © 2019 Elsevier B.V.
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 M. and Nikolić, Nebojša D. and Baščarević, Zvezdana D. and Barudžija, Tanja and Jovićević, Jovan N.",
year = "2019",
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. © 2019 Elsevier B.V.",
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, V. S., Vukićević, N. M., Nikolić, N. D., Baščarević, Z. D., Barudžija, T.,& 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. in Journal of Electroanalytical Chemistry, 842, 168-175.
https://doi.org/10.1016/j.jelechem.2019.04.067

Cvetković VS, Vukićević NM, Nikolić ND, Baščarević ZD, Barudžija T, 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. in Journal of Electroanalytical Chemistry. 2019;842:168-175.
doi:10.1016/j.jelechem.2019.04.067 .

Cvetković, Vesna S., Vukićević, Nataša M., Nikolić, Nebojša D., Baščarević, Zvezdana D., Barudžija, Tanja, 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" in Journal of Electroanalytical Chemistry, 842 (2019):168-175,
https://doi.org/10.1016/j.jelechem.2019.04.067 . .

TY  - JOUR
AU  - Cvetković, Vesna S.
AU  - Vukićević, Nataša M.
AU  - Nikolić, Nebojša D.
AU  - Branković, Goran O.
AU  - Barudžija, Tanja
AU  - Jovićević, Jovan N.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7641
AB  - The processes of electrochemical deposition of magnesium oxide/hydroxide on glassy carbon (GC) electrode from magnesium nitrate hexahydrate melt have been investigated. A novel procedure predicting a possibility of direct formation of magnesium oxide during electrodeposition from the nitrate melt used is reported. XRD analysis of the obtained deposits showed the formation of magnesium oxide along with magnesium hydroxide. The electrodeposition of magnesium oxide/hydroxide commences in magnesium underpotential (UPD) and continues through the magnesium overpotential (OPD) region. Network of individual or intertwined very thin needles as well as those grouped in flower-like aggregates or honeycomb-like structures were formed in both magnesium UPD and OPD regions. Formation of the long needles was explained through theories of mechanisms of dendrite formation. Hydrogen evolution commences in the magnesium OPD region and increases with the applied overpotential. Holes observed in the deposit originated from the detached hydrogen bubbles. The number, shape and size of the hole strongly depended on both the applied cathodic potential and the hold time of electrodeposition. Magnesium oxides/hydroxides syntheses taking part simultaneously at various applied potentials are a result of reactions between magnesium cations and products of water and nitrate anions reduction processes. Chemical reactions responsible for direct formation of magnesium oxide observed are those of magnesium ions and oxygen ions, formed by nitrate reduction taking part in the close vicinity of the working electrode. (C) 2018 Elsevier Ltd. All rights reserved.
T2  - Electrochimica Acta
T1  - Formation of needle-like and honeycomb-like magnesium oxide/hydroxide structures by electrodeposition from magnesium nitrate melts
VL  - 268
SP  - 494
EP  - 502
DO  - 10.1016/j.electacta.2018.02.121
ER  - 

@article{
author = "Cvetković, Vesna S. and Vukićević, Nataša M. and Nikolić, Nebojša D. and Branković, Goran O. and Barudžija, Tanja and Jovićević, Jovan N.",
year = "2018",
abstract = "The processes of electrochemical deposition of magnesium oxide/hydroxide on glassy carbon (GC) electrode from magnesium nitrate hexahydrate melt have been investigated. A novel procedure predicting a possibility of direct formation of magnesium oxide during electrodeposition from the nitrate melt used is reported. XRD analysis of the obtained deposits showed the formation of magnesium oxide along with magnesium hydroxide. The electrodeposition of magnesium oxide/hydroxide commences in magnesium underpotential (UPD) and continues through the magnesium overpotential (OPD) region. Network of individual or intertwined very thin needles as well as those grouped in flower-like aggregates or honeycomb-like structures were formed in both magnesium UPD and OPD regions. Formation of the long needles was explained through theories of mechanisms of dendrite formation. Hydrogen evolution commences in the magnesium OPD region and increases with the applied overpotential. Holes observed in the deposit originated from the detached hydrogen bubbles. The number, shape and size of the hole strongly depended on both the applied cathodic potential and the hold time of electrodeposition. Magnesium oxides/hydroxides syntheses taking part simultaneously at various applied potentials are a result of reactions between magnesium cations and products of water and nitrate anions reduction processes. Chemical reactions responsible for direct formation of magnesium oxide observed are those of magnesium ions and oxygen ions, formed by nitrate reduction taking part in the close vicinity of the working electrode. (C) 2018 Elsevier Ltd. All rights reserved.",
journal = "Electrochimica Acta",
title = "Formation of needle-like and honeycomb-like magnesium oxide/hydroxide structures by electrodeposition from magnesium nitrate melts",
volume = "268",
pages = "494-502",
doi = "10.1016/j.electacta.2018.02.121"
}

Cvetković, V. S., Vukićević, N. M., Nikolić, N. D., Branković, G. O., Barudžija, T.,& Jovićević, J. N.. (2018). Formation of needle-like and honeycomb-like magnesium oxide/hydroxide structures by electrodeposition from magnesium nitrate melts. in Electrochimica Acta, 268, 494-502.
https://doi.org/10.1016/j.electacta.2018.02.121

Cvetković VS, Vukićević NM, Nikolić ND, Branković GO, Barudžija T, Jovićević JN. Formation of needle-like and honeycomb-like magnesium oxide/hydroxide structures by electrodeposition from magnesium nitrate melts. in Electrochimica Acta. 2018;268:494-502.
doi:10.1016/j.electacta.2018.02.121 .

Cvetković, Vesna S., Vukićević, Nataša M., Nikolić, Nebojša D., Branković, Goran O., Barudžija, Tanja, Jovićević, Jovan N., "Formation of needle-like and honeycomb-like magnesium oxide/hydroxide structures by electrodeposition from magnesium nitrate melts" in Electrochimica Acta, 268 (2018):494-502,
https://doi.org/10.1016/j.electacta.2018.02.121 . .

TY  - JOUR
AU  - Vukićević, Nataša M.
AU  - Cvetković, Vesna S.
AU  - Nikolić, Nebojša D.
AU  - Branković, Goran O.
AU  - Barudžija, Tanja
AU  - Jovićević, Jovan N.
PY  - 2018
UR  - http://www.doiserbia.nb.rs/Article.aspx?ID=0352-51391800084V
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8019
AB  - 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. © 2018 The Korean Physical Society. All rights reserved.
AB  - Представљено је формирање MgO/Mg(OH)2 структура облика пчелињег саћа контролисаног облика и величине рупа, процесом електролизе растопљеног магнезијум-
-нитрата-хексахидрата на стакластом угљенику. Добијене структуре пчелињег саћа су се
састојале од рупа, формираних одвајањем мехурова водоника, окружених зидом од
танких испреплетаних игала. По први пут је показано да се структуре пчелињег саћа
могу добити не само електролизом из водених електролита, већ такође и електролизом
из растопа. Аналогије са процесима формирања талога облика пчелињег саћа из водених раствора су изнесене и продискутоване. Све законитости утврђене за формирање
ових структура из водених електролита, као што су повећање броја рупа, смањење величине рупа и сједињавање суседних мехурова водоника посматраних са повећањем катодног потенцијала, важе и за електролизу из растопа.
T2  - Journal of the Serbian Chemical Society
T1  - Formation of the honeycomb-like MgO/Mg(OH)2 structures with controlled shape and size of holes by molten salt electrolysis
VL  - 83
IS  - 12
SP  - 1351
EP  - 1362
DO  - 10.2298/JSC180913084V
ER  - 

@article{
author = "Vukićević, Nataša M. and Cvetković, Vesna S. and Nikolić, Nebojša D. and Branković, Goran O. and Barudžija, Tanja and Jovićević, Jovan N.",
year = "2018",
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 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. © 2018 The Korean Physical Society. All rights reserved., Представљено је формирање MgO/Mg(OH)2 структура облика пчелињег саћа контролисаног облика и величине рупа, процесом електролизе растопљеног магнезијум-
-нитрата-хексахидрата на стакластом угљенику. Добијене структуре пчелињег саћа су се
састојале од рупа, формираних одвајањем мехурова водоника, окружених зидом од
танких испреплетаних игала. По први пут је показано да се структуре пчелињег саћа
могу добити не само електролизом из водених електролита, већ такође и електролизом
из растопа. Аналогије са процесима формирања талога облика пчелињег саћа из водених раствора су изнесене и продискутоване. Све законитости утврђене за формирање
ових структура из водених електролита, као што су повећање броја рупа, смањење величине рупа и сједињавање суседних мехурова водоника посматраних са повећањем катодног потенцијала, важе и за електролизу из растопа.",
journal = "Journal of the Serbian Chemical Society",
title = "Formation of the honeycomb-like MgO/Mg(OH)2 structures with controlled shape and size of holes by molten salt electrolysis",
volume = "83",
number = "12",
pages = "1351-1362",
doi = "10.2298/JSC180913084V"
}

Vukićević, N. M., Cvetković, V. S., Nikolić, N. D., Branković, G. O., Barudžija, T.,& Jovićević, J. N.. (2018). Formation of the honeycomb-like MgO/Mg(OH)2 structures with controlled shape and size of holes by molten salt electrolysis. in Journal of the Serbian Chemical Society, 83(12), 1351-1362.
https://doi.org/10.2298/JSC180913084V

Vukićević NM, Cvetković VS, Nikolić ND, Branković GO, Barudžija T, Jovićević JN. Formation of the honeycomb-like MgO/Mg(OH)2 structures with controlled shape and size of holes by molten salt electrolysis. in Journal of the Serbian Chemical Society. 2018;83(12):1351-1362.
doi:10.2298/JSC180913084V .

Vukićević, Nataša M., Cvetković, Vesna S., Nikolić, Nebojša D., Branković, Goran O., Barudžija, Tanja, Jovićević, Jovan N., "Formation of the honeycomb-like MgO/Mg(OH)2 structures with controlled shape and size of holes by molten salt electrolysis" in Journal of the Serbian Chemical Society, 83, no. 12 (2018):1351-1362,
https://doi.org/10.2298/JSC180913084V . .