TY  - JOUR
AU  - Spasojević, Milica
AU  - Ribić-Zelenović, Lenka
AU  - Spasojević, Miroslav
PY  - 2021
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/4529
AB  - The catalyst composed of a mixture of nanocrystals of metallic Pt and rutile RuO2 was prepared by a thermal procedure on a titanium substrate. An effect of the mixture composition on its microstructure, surface properties, and catalytic activity for an electrooxidation of 1-propanol in an alkaline environment was examined. The relation between the microstructure of the Pt/RuO2 catalyst and its catalytic activity was determined. It was found that the increase in the RuO2 content resulted in the increase in the catalytic activity, which reached its maximum value and then decreased. The catalytic effect was caused by the bifunctional mechanism of the catalyst Pt/RuO2. Ru-OH species were formed on Ru atoms of RuO2 nanocrystals at more negative potentials than on Pt. These oxy species oxidized firmly adsorbed intermediates propionyl, COad, C2Hyad, and CHad and, thus, released Pt atoms for the adsorption and dehydrogenation of the subsequent molecules of 1-propanol.
PB  - Springer Link
T2  - Monatshefte für Chemie - Chemical Monthly
T1  - Electrooxidation of 1-propanol on the mixture of nanoparticles of Pt and RuO2
VL  - 152
IS  - 5
SP  - 489
EP  - 496
DO  - 10.1007/s00706-021-02769-9
ER  - 

@article{
author = "Spasojević, Milica and Ribić-Zelenović, Lenka and Spasojević, Miroslav",
year = "2021",
abstract = "The catalyst composed of a mixture of nanocrystals of metallic Pt and rutile RuO2 was prepared by a thermal procedure on a titanium substrate. An effect of the mixture composition on its microstructure, surface properties, and catalytic activity for an electrooxidation of 1-propanol in an alkaline environment was examined. The relation between the microstructure of the Pt/RuO2 catalyst and its catalytic activity was determined. It was found that the increase in the RuO2 content resulted in the increase in the catalytic activity, which reached its maximum value and then decreased. The catalytic effect was caused by the bifunctional mechanism of the catalyst Pt/RuO2. Ru-OH species were formed on Ru atoms of RuO2 nanocrystals at more negative potentials than on Pt. These oxy species oxidized firmly adsorbed intermediates propionyl, COad, C2Hyad, and CHad and, thus, released Pt atoms for the adsorption and dehydrogenation of the subsequent molecules of 1-propanol.",
publisher = "Springer Link",
journal = "Monatshefte für Chemie - Chemical Monthly",
title = "Electrooxidation of 1-propanol on the mixture of nanoparticles of Pt and RuO2",
volume = "152",
number = "5",
pages = "489-496",
doi = "10.1007/s00706-021-02769-9"
}

Spasojević, M., Ribić-Zelenović, L.,& Spasojević, M.. (2021). Electrooxidation of 1-propanol on the mixture of nanoparticles of Pt and RuO2. in Monatshefte für Chemie - Chemical Monthly
Springer Link., 152(5), 489-496.
https://doi.org/10.1007/s00706-021-02769-9

Spasojević M, Ribić-Zelenović L, Spasojević M. Electrooxidation of 1-propanol on the mixture of nanoparticles of Pt and RuO2. in Monatshefte für Chemie - Chemical Monthly. 2021;152(5):489-496.
doi:10.1007/s00706-021-02769-9 .

Spasojević, Milica, Ribić-Zelenović, Lenka, Spasojević, Miroslav, "Electrooxidation of 1-propanol on the mixture of nanoparticles of Pt and RuO2" in Monatshefte für Chemie - Chemical Monthly, 152, no. 5 (2021):489-496,
https://doi.org/10.1007/s00706-021-02769-9 . .

TY  - JOUR
AU  - Spasojević, Milica
AU  - Spasojević, Miroslav
AU  - Ribić-Zelenović, Lenka
PY  - 2020
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3822
AB  - Thermally prepared catalytic coatings on a titanium substrate were composed of a mixture of nanocrystals of metallic Pt and RuO2 of rutile structure and used for electrooxidation of formaldehyde. The size of the RuO2 nanocrystals increased, whereas those of Pt decreased with increasing the content of RuO2 in the mixture. At more positive potentials, the maximum catalytic activities showed the coatings with lower content of RuO2. Mechanism of formaldehyde oxidation was derived to show two reaction pathways. In the first one, H2C(OH)2 was directly oxidized to CO2, whereas COad was formed in the latter. COad is strongly adsorbed on Pt atoms, which causes blocking of these atoms and thus, preventing direct dehydrogenation of H2C(OH)2 to CO2. The overall catalytic effect of the mixture of nanocrystals was caused by the bifunctional mechanism. Thus, the Ru atoms formed the oxy species at more negative potentials than Pt. These oxy species oxidized the COad intermediates, bound to adjacent Pt atoms and accordingly, discharged them for dehydrogenation of new molecules of H2C(OH)2.
PB  - Springer
T2  - Monatshefte fur Chemie
T1  - A catalyst coated electrode for electrochemical formaldehyde oxidation
VL  - 151
IS  - 1
SP  - 33
EP  - 43
DO  - 10.1007/s00706-019-02533-0
ER  - 

@article{
author = "Spasojević, Milica and Spasojević, Miroslav and Ribić-Zelenović, Lenka",
year = "2020",
abstract = "Thermally prepared catalytic coatings on a titanium substrate were composed of a mixture of nanocrystals of metallic Pt and RuO2 of rutile structure and used for electrooxidation of formaldehyde. The size of the RuO2 nanocrystals increased, whereas those of Pt decreased with increasing the content of RuO2 in the mixture. At more positive potentials, the maximum catalytic activities showed the coatings with lower content of RuO2. Mechanism of formaldehyde oxidation was derived to show two reaction pathways. In the first one, H2C(OH)2 was directly oxidized to CO2, whereas COad was formed in the latter. COad is strongly adsorbed on Pt atoms, which causes blocking of these atoms and thus, preventing direct dehydrogenation of H2C(OH)2 to CO2. The overall catalytic effect of the mixture of nanocrystals was caused by the bifunctional mechanism. Thus, the Ru atoms formed the oxy species at more negative potentials than Pt. These oxy species oxidized the COad intermediates, bound to adjacent Pt atoms and accordingly, discharged them for dehydrogenation of new molecules of H2C(OH)2.",
publisher = "Springer",
journal = "Monatshefte fur Chemie",
title = "A catalyst coated electrode for electrochemical formaldehyde oxidation",
volume = "151",
number = "1",
pages = "33-43",
doi = "10.1007/s00706-019-02533-0"
}

Spasojević, M., Spasojević, M.,& Ribić-Zelenović, L.. (2020). A catalyst coated electrode for electrochemical formaldehyde oxidation. in Monatshefte fur Chemie
Springer., 151(1), 33-43.
https://doi.org/10.1007/s00706-019-02533-0

Spasojević M, Spasojević M, Ribić-Zelenović L. A catalyst coated electrode for electrochemical formaldehyde oxidation. in Monatshefte fur Chemie. 2020;151(1):33-43.
doi:10.1007/s00706-019-02533-0 .

Spasojević, Milica, Spasojević, Miroslav, Ribić-Zelenović, Lenka, "A catalyst coated electrode for electrochemical formaldehyde oxidation" in Monatshefte fur Chemie, 151, no. 1 (2020):33-43,
https://doi.org/10.1007/s00706-019-02533-0 . .

TY  - JOUR
AU  - Spasojević, Milica
AU  - Ribić-Zelenović, Lenka
AU  - Spasojević, Miroslav
AU  - Trišović, Tomislav
PY  - 2020
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/4273
AB  - A catalytic coating composed of a mixture of RuO2 and Pt
nanocrystals was prepared by a thermal procedure on a titanium
substrate and used for the electrochemical oxidation of methanol.
The adsorption of the intermediate CO, formed by methanol
oxidation on Pt nanocrystals, depended on potential and the
coating composition. An increase in the RuO2 content decreased
the rate of methanol dehydrogenation and increased the rate of
oxidation of the strongly bound intermediate COad. This caused a
decrease in the maximum coverage of Pt nanocrystals with COad
and a shift of the rapid linear drop in COad coverage to more
negative potentials.
PB  - Academia Romana
T2  - Revue Roumaine de Chimie
T1  - The effect of the composition of the alloy of ruo2 and pt nanocrystals on intermediate adsorption during methanol oxidation
VL  - 65
IS  - 5
SP  - 481
EP  - 489
DO  - 10.33224/rrch.2020.65.5.08
ER  - 

@article{
author = "Spasojević, Milica and Ribić-Zelenović, Lenka and Spasojević, Miroslav and Trišović, Tomislav",
year = "2020",
abstract = "A catalytic coating composed of a mixture of RuO2 and Pt
nanocrystals was prepared by a thermal procedure on a titanium
substrate and used for the electrochemical oxidation of methanol.
The adsorption of the intermediate CO, formed by methanol
oxidation on Pt nanocrystals, depended on potential and the
coating composition. An increase in the RuO2 content decreased
the rate of methanol dehydrogenation and increased the rate of
oxidation of the strongly bound intermediate COad. This caused a
decrease in the maximum coverage of Pt nanocrystals with COad
and a shift of the rapid linear drop in COad coverage to more
negative potentials.",
publisher = "Academia Romana",
journal = "Revue Roumaine de Chimie",
title = "The effect of the composition of the alloy of ruo2 and pt nanocrystals on intermediate adsorption during methanol oxidation",
volume = "65",
number = "5",
pages = "481-489",
doi = "10.33224/rrch.2020.65.5.08"
}

Spasojević, M., Ribić-Zelenović, L., Spasojević, M.,& Trišović, T.. (2020). The effect of the composition of the alloy of ruo2 and pt nanocrystals on intermediate adsorption during methanol oxidation. in Revue Roumaine de Chimie
Academia Romana., 65(5), 481-489.
https://doi.org/10.33224/rrch.2020.65.5.08

Spasojević M, Ribić-Zelenović L, Spasojević M, Trišović T. The effect of the composition of the alloy of ruo2 and pt nanocrystals on intermediate adsorption during methanol oxidation. in Revue Roumaine de Chimie. 2020;65(5):481-489.
doi:10.33224/rrch.2020.65.5.08 .

Spasojević, Milica, Ribić-Zelenović, Lenka, Spasojević, Miroslav, Trišović, Tomislav, "The effect of the composition of the alloy of ruo2 and pt nanocrystals on intermediate adsorption during methanol oxidation" in Revue Roumaine de Chimie, 65, no. 5 (2020):481-489,
https://doi.org/10.33224/rrch.2020.65.5.08 . .

TY  - JOUR
AU  - Spasojević, Milica
AU  - Marković, Dušan
AU  - Spasojević, Miroslav
AU  - Vuković, Zoran
AU  - Maričić, Aleksa
AU  - Ribić-Zelenović, Lenka
PY  - 2019
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3325
AB  - Ni-Fe-W-Cu alloy powders were obtained by electrodeposition from an ammonium citrate bath at current densities ranging between 70 and 600 mA cm-2. As the deposition current density increased, the contents of Fe and W in the alloy increased, and those of Ni and Cu decreased. The total cathodic polarization curve was recorded, and partial polarization curves for Ni, Fe and W deposition and hydrogen evolution were determined. The current efficiency of alloy deposition was measured. The powders contained an amorphous matrix and FCC nanocrystals of the solid solution of Fe, W and Cu in Ni. At high current densities, small-sized nanocrystals exhibiting high internal microstrain values were formed. Powder particles were dendrite-and cauliflower-shaped. The dendrites had a large number of secondary branches and higher-order branches containing interconnected globules. The density of branches was higher in particles formed at high current densities. The powders formed at high current densities exhibited higher magnetization. Annealing at temperatures up to 460 °C resulted in structural relaxation, accompanied by an increase in magnetization. At temperatures above 460 °C, amorphous matrix crystallization and FCC crystal growth took place, accompanied by a decrease in magnetization.
T2  - Science of Sintering
T1  - Effect of deposition current density and annealing temperature on the microstructure and magnetic properties of nanostructured ni-fe-w-cu alloys
VL  - 51
IS  - 2
SP  - 1
EP  - 13
DO  - 10.2298/SOS1902209S
ER  - 

@article{
author = "Spasojević, Milica and Marković, Dušan and Spasojević, Miroslav and Vuković, Zoran and Maričić, Aleksa and Ribić-Zelenović, Lenka",
year = "2019",
abstract = "Ni-Fe-W-Cu alloy powders were obtained by electrodeposition from an ammonium citrate bath at current densities ranging between 70 and 600 mA cm-2. As the deposition current density increased, the contents of Fe and W in the alloy increased, and those of Ni and Cu decreased. The total cathodic polarization curve was recorded, and partial polarization curves for Ni, Fe and W deposition and hydrogen evolution were determined. The current efficiency of alloy deposition was measured. The powders contained an amorphous matrix and FCC nanocrystals of the solid solution of Fe, W and Cu in Ni. At high current densities, small-sized nanocrystals exhibiting high internal microstrain values were formed. Powder particles were dendrite-and cauliflower-shaped. The dendrites had a large number of secondary branches and higher-order branches containing interconnected globules. The density of branches was higher in particles formed at high current densities. The powders formed at high current densities exhibited higher magnetization. Annealing at temperatures up to 460 °C resulted in structural relaxation, accompanied by an increase in magnetization. At temperatures above 460 °C, amorphous matrix crystallization and FCC crystal growth took place, accompanied by a decrease in magnetization.",
journal = "Science of Sintering",
title = "Effect of deposition current density and annealing temperature on the microstructure and magnetic properties of nanostructured ni-fe-w-cu alloys",
volume = "51",
number = "2",
pages = "1-13",
doi = "10.2298/SOS1902209S"
}

Spasojević, M., Marković, D., Spasojević, M., Vuković, Z., Maričić, A.,& Ribić-Zelenović, L.. (2019). Effect of deposition current density and annealing temperature on the microstructure and magnetic properties of nanostructured ni-fe-w-cu alloys. in Science of Sintering, 51(2), 1-13.
https://doi.org/10.2298/SOS1902209S

Spasojević M, Marković D, Spasojević M, Vuković Z, Maričić A, Ribić-Zelenović L. Effect of deposition current density and annealing temperature on the microstructure and magnetic properties of nanostructured ni-fe-w-cu alloys. in Science of Sintering. 2019;51(2):1-13.
doi:10.2298/SOS1902209S .

Spasojević, Milica, Marković, Dušan, Spasojević, Miroslav, Vuković, Zoran, Maričić, Aleksa, Ribić-Zelenović, Lenka, "Effect of deposition current density and annealing temperature on the microstructure and magnetic properties of nanostructured ni-fe-w-cu alloys" in Science of Sintering, 51, no. 2 (2019):1-13,
https://doi.org/10.2298/SOS1902209S . .

TY  - JOUR
AU  - Spasojević, Miroslav
AU  - Spasojević, Milica
AU  - Mašković, Pavle
AU  - Marković, Dušan
AU  - Ribić-Zelenović, Lenka
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2200
AB  - Powders of Ni-Co alloys containing small amounts of Cu were produced by electrodeposition from an ammonium bath. Cathodic polarization curves were recorded and partial current densities for alloy deposition and hydrogen evolution were determined. At a current density of 100 mA cm(-2), the electrodeposition process resulted in Ni79.1Co18.6Cu2.3 powder with an average grain size of 6.8 nm, composed of an amorphous matrix and FCC nanocrystals. The deposition of Cu with Ni and Co led to a higher proportion of the amorphous phase, smaller nanocrystals and smaller powder particles in the electrodeposit than in the alloy without copper. During annealing at temperatures ranging from 25 degrees C to 160 degrees C, no structural changes occurred in the powder. Upon structural relaxation in the temperature range of 160-350 degrees C, the powders cooled at 25 degrees C showed greater magnetic permeability. At temperatures between 350 degrees C and 430 degrees C, the amorphous phase exhibiting relatively lower magnetization underwent crystallization, accompanied by the formation of small-sized FCC nanocrystals, which had relatively higher magnetization values, leading to an increase in the magnetic permeability of the cooled powder. At temperatures above 430 degrees C, the formation of large crystalline grains at the expense of small ones caused a decrease in magnetization. (C) 2018 The Electrochemical Society.
PB  - Electrochemical Soc Inc, Pennington
T2  - Journal of the Electrochemical Society
T1  - Electrodeposition, Microstructure and Magnetic Properties of Nickel-Cobalt-Copper Alloy Powders
VL  - 165
IS  - 11
DO  - 10.1149/2.0441811jes
ER  - 

@article{
author = "Spasojević, Miroslav and Spasojević, Milica and Mašković, Pavle and Marković, Dušan and Ribić-Zelenović, Lenka",
year = "2018",
abstract = "Powders of Ni-Co alloys containing small amounts of Cu were produced by electrodeposition from an ammonium bath. Cathodic polarization curves were recorded and partial current densities for alloy deposition and hydrogen evolution were determined. At a current density of 100 mA cm(-2), the electrodeposition process resulted in Ni79.1Co18.6Cu2.3 powder with an average grain size of 6.8 nm, composed of an amorphous matrix and FCC nanocrystals. The deposition of Cu with Ni and Co led to a higher proportion of the amorphous phase, smaller nanocrystals and smaller powder particles in the electrodeposit than in the alloy without copper. During annealing at temperatures ranging from 25 degrees C to 160 degrees C, no structural changes occurred in the powder. Upon structural relaxation in the temperature range of 160-350 degrees C, the powders cooled at 25 degrees C showed greater magnetic permeability. At temperatures between 350 degrees C and 430 degrees C, the amorphous phase exhibiting relatively lower magnetization underwent crystallization, accompanied by the formation of small-sized FCC nanocrystals, which had relatively higher magnetization values, leading to an increase in the magnetic permeability of the cooled powder. At temperatures above 430 degrees C, the formation of large crystalline grains at the expense of small ones caused a decrease in magnetization. (C) 2018 The Electrochemical Society.",
publisher = "Electrochemical Soc Inc, Pennington",
journal = "Journal of the Electrochemical Society",
title = "Electrodeposition, Microstructure and Magnetic Properties of Nickel-Cobalt-Copper Alloy Powders",
volume = "165",
number = "11",
doi = "10.1149/2.0441811jes"
}

Spasojević, M., Spasojević, M., Mašković, P., Marković, D.,& Ribić-Zelenović, L.. (2018). Electrodeposition, Microstructure and Magnetic Properties of Nickel-Cobalt-Copper Alloy Powders. in Journal of the Electrochemical Society
Electrochemical Soc Inc, Pennington., 165(11).
https://doi.org/10.1149/2.0441811jes

Spasojević M, Spasojević M, Mašković P, Marković D, Ribić-Zelenović L. Electrodeposition, Microstructure and Magnetic Properties of Nickel-Cobalt-Copper Alloy Powders. in Journal of the Electrochemical Society. 2018;165(11).
doi:10.1149/2.0441811jes .

Spasojević, Miroslav, Spasojević, Milica, Mašković, Pavle, Marković, Dušan, Ribić-Zelenović, Lenka, "Electrodeposition, Microstructure and Magnetic Properties of Nickel-Cobalt-Copper Alloy Powders" in Journal of the Electrochemical Society, 165, no. 11 (2018),
https://doi.org/10.1149/2.0441811jes . .