TY  - JOUR
AU  - Mijailović, Daniel M.
AU  - Radmilović, Vuk V.
AU  - Lačnjevac, Uroš
AU  - Stojanović, Dusica B.
AU  - Bustillo, Karen C.
AU  - Jović, Vladimir D
AU  - Radmilović, Velimir R
AU  - Uskoković, Petar S.
PY  - 2021
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1496
AB  - We herein report a simple two-step procedure for fabricating tetragonal CoMn2O4 spinel nanocrystals on carbon fibers. The battery-type behavior of these composite fibers arises from the redox activity of CoMn2O4 in an alkaline aqueous solution, which, in combination with the carbon fibers, endows good electrochemical performance and long-term stability. The C"CoMn2O4 electrode exhibited high specific capacity, up to 62 mA h g(-1) at 1 A g(-1) with a capacity retention of around 90% after 4000 cycles. A symmetrical coin-cell device assembled with the composite electrodes delivered a high energy density of 7.3 W h kg(-1) at a power density of 0.1 kW kg(-1), which is around 13 times higher than that of bare carbon electrodes. The coin cell was cycled for 5000 cycles with 96.3% capacitance retention, at a voltage of up to 0.8 V, demonstrating excellent cycling stability.
PB  - Royal Soc Chemistry, Cambridge
T2  - Dalton Transactions
T1  - Tetragonal CoMn2O4 nanocrystals on electrospun carbon fibers as high-performance battery-type supercapacitor electrode materials
EP  - 15678
IS  - 43
SP  - 15669
VL  - 50
DO  - 10.1039/d1dt02829d
ER  - 

@article{
author = "Mijailović, Daniel M. and Radmilović, Vuk V. and Lačnjevac, Uroš and Stojanović, Dusica B. and Bustillo, Karen C. and Jović, Vladimir D and Radmilović, Velimir R and Uskoković, Petar S.",
year = "2021",
abstract = "We herein report a simple two-step procedure for fabricating tetragonal CoMn2O4 spinel nanocrystals on carbon fibers. The battery-type behavior of these composite fibers arises from the redox activity of CoMn2O4 in an alkaline aqueous solution, which, in combination with the carbon fibers, endows good electrochemical performance and long-term stability. The C"CoMn2O4 electrode exhibited high specific capacity, up to 62 mA h g(-1) at 1 A g(-1) with a capacity retention of around 90% after 4000 cycles. A symmetrical coin-cell device assembled with the composite electrodes delivered a high energy density of 7.3 W h kg(-1) at a power density of 0.1 kW kg(-1), which is around 13 times higher than that of bare carbon electrodes. The coin cell was cycled for 5000 cycles with 96.3% capacitance retention, at a voltage of up to 0.8 V, demonstrating excellent cycling stability.",
publisher = "Royal Soc Chemistry, Cambridge",
journal = "Dalton Transactions",
title = "Tetragonal CoMn2O4 nanocrystals on electrospun carbon fibers as high-performance battery-type supercapacitor electrode materials",
pages = "15678-15669",
number = "43",
volume = "50",
doi = "10.1039/d1dt02829d"
}

Mijailović, D. M., Radmilović, V. V., Lačnjevac, U., Stojanović, D. B., Bustillo, K. C., Jović, V. D., Radmilović, V. R.,& Uskoković, P. S.. (2021). Tetragonal CoMn2O4 nanocrystals on electrospun carbon fibers as high-performance battery-type supercapacitor electrode materials. in Dalton Transactions
Royal Soc Chemistry, Cambridge., 50(43), 15669-15678.
https://doi.org/10.1039/d1dt02829d

Mijailović DM, Radmilović VV, Lačnjevac U, Stojanović DB, Bustillo KC, Jović VD, Radmilović VR, Uskoković PS. Tetragonal CoMn2O4 nanocrystals on electrospun carbon fibers as high-performance battery-type supercapacitor electrode materials. in Dalton Transactions. 2021;50(43):15669-15678.
doi:10.1039/d1dt02829d .

Mijailović, Daniel M., Radmilović, Vuk V., Lačnjevac, Uroš, Stojanović, Dusica B., Bustillo, Karen C., Jović, Vladimir D, Radmilović, Velimir R, Uskoković, Petar S., "Tetragonal CoMn2O4 nanocrystals on electrospun carbon fibers as high-performance battery-type supercapacitor electrode materials" in Dalton Transactions, 50, no. 43 (2021):15669-15678,
https://doi.org/10.1039/d1dt02829d . .

TY  - JOUR
AU  - Krstajic-Pajic, M. N.
AU  - Stevanović, Sanja I.
AU  - Radmilović, Velimir R
AU  - Gavrilovic-Wohlmuther, Aleksandra
AU  - Zabinski, P.
AU  - Elezović, Nevenka R.
AU  - Radmilović, Vuk V.
AU  - Gojković, Snežana Lj
AU  - Jovanović, V. M.
PY  - 2019
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1218
AB  - Low loading PtAu nanoparticles supported on high area carbon were synthesized by water-in-oil microemulsion method and examined for formic acid and methanol oxidation. Prepared catalyst powder was characterized by Xray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). These techniques revealed that the catalyst contains rather agglomerated quasi-spherical particles, similar to 4 nm diameter, composed of a solid solution of Pt and Au with only similar to 4 at% of Au. In spite of such low Au content, both onset and peak potentials for CO oxidation are shifted some 150 mV to more positive values in comparison to Pt synthesized in the same manner due to stronger binding of CO as a result of notable electronic effect. It is important that this small quantity of Au also significantly influences oxidation of formic acid promoting direct path and suppressing indirect path in formic acid oxidation in a degree as expected by a much larger quantity of Au. Such improvement could be due exclusively by ensemble effect of high number of small Pt domains which formation could be possible only by very fine dispersion of such low Au quantity. High number of small Pt domains is corroborated by lower activity for methanol oxidation in comparison to Pt catalyst synthesized by the same procedure. These results emphasize the importance of the Au dispersion on the surface of Pt over its quantity in PtAu catalyst with regards to both, the ensemble and the electronic effects.
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Catalysis B-Environmental
T1  - Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method
EP  - 593
SP  - 585
VL  - 243
DO  - 10.1016/j.apcatb.2018.10.064
ER  - 

@article{
author = "Krstajic-Pajic, M. N. and Stevanović, Sanja I. and Radmilović, Velimir R and Gavrilovic-Wohlmuther, Aleksandra and Zabinski, P. and Elezović, Nevenka R. and Radmilović, Vuk V. and Gojković, Snežana Lj and Jovanović, V. M.",
year = "2019",
abstract = "Low loading PtAu nanoparticles supported on high area carbon were synthesized by water-in-oil microemulsion method and examined for formic acid and methanol oxidation. Prepared catalyst powder was characterized by Xray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). These techniques revealed that the catalyst contains rather agglomerated quasi-spherical particles, similar to 4 nm diameter, composed of a solid solution of Pt and Au with only similar to 4 at% of Au. In spite of such low Au content, both onset and peak potentials for CO oxidation are shifted some 150 mV to more positive values in comparison to Pt synthesized in the same manner due to stronger binding of CO as a result of notable electronic effect. It is important that this small quantity of Au also significantly influences oxidation of formic acid promoting direct path and suppressing indirect path in formic acid oxidation in a degree as expected by a much larger quantity of Au. Such improvement could be due exclusively by ensemble effect of high number of small Pt domains which formation could be possible only by very fine dispersion of such low Au quantity. High number of small Pt domains is corroborated by lower activity for methanol oxidation in comparison to Pt catalyst synthesized by the same procedure. These results emphasize the importance of the Au dispersion on the surface of Pt over its quantity in PtAu catalyst with regards to both, the ensemble and the electronic effects.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Catalysis B-Environmental",
title = "Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method",
pages = "593-585",
volume = "243",
doi = "10.1016/j.apcatb.2018.10.064"
}

Krstajic-Pajic, M. N., Stevanović, S. I., Radmilović, V. R., Gavrilovic-Wohlmuther, A., Zabinski, P., Elezović, N. R., Radmilović, V. V., Gojković, S. L.,& Jovanović, V. M.. (2019). Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method. in Applied Catalysis B-Environmental
Elsevier Science Bv, Amsterdam., 243, 585-593.
https://doi.org/10.1016/j.apcatb.2018.10.064

Krstajic-Pajic MN, Stevanović SI, Radmilović VR, Gavrilovic-Wohlmuther A, Zabinski P, Elezović NR, Radmilović VV, Gojković SL, Jovanović VM. Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method. in Applied Catalysis B-Environmental. 2019;243:585-593.
doi:10.1016/j.apcatb.2018.10.064 .

Krstajic-Pajic, M. N., Stevanović, Sanja I., Radmilović, Velimir R, Gavrilovic-Wohlmuther, Aleksandra, Zabinski, P., Elezović, Nevenka R., Radmilović, Vuk V., Gojković, Snežana Lj, Jovanović, V. M., "Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method" in Applied Catalysis B-Environmental, 243 (2019):585-593,
https://doi.org/10.1016/j.apcatb.2018.10.064 . .

TY  - JOUR
AU  - Obradovitc, M. D.
AU  - Stancic, Z. M.
AU  - Lačnjevac, Uroš
AU  - Radmilović, Velimir R
AU  - Gavrilovic-Wohlmuther, Aleksandra
AU  - Radmilović, Vuk V.
AU  - Gojković, Snežana Lj
PY  - 2016
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1012
AB  - Pd-Ni/C catalyst was synthesized employing a borohydride reduction method. The high area Ni was first dispersed on the carbon support and then modified by Pd nanoparticles. Transmission electron microscopy confirmed relatively even distribution of Ni across the carbon support with discrete palladium particles of about 3.3 nm mean diameter on it. Cyclic voltammetry confirmed the presence of Ni on the catalyst surface. The activity of the Pd-Ni/C catalysts for ethanol oxidation reaction (EOR) in alkaline solution was tested under the potentiodynamic and potentiostatic conditions and the results were compared to those obtained on the Pd/C catalyst. It was found that Pd-Ni/C is more active for the EOR compared to Pd/C by a factor up to 3, depending on the type of experiments and whether specific activity or mass activity are considered. During the potentiodynamic stability test an interesting phenomenon of activation of Pd-Ni/C catalyst was observed. It was found that maximum activity is attained after fifty cycles with the positive potential limit of 1.2 V, regardless of whether they were performed in the electrolyte with or without ethanol. It was postulated that potential cycling of the Pd-Ni surface causes reorganization of the catalyst surface bringing Pd and Ni sites to a more suitable arrangement for the efficient ethanol oxidation.
PB  - Elsevier, Amsterdam
T2  - Applied Catalysis B-Environmental
T1  - Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media
EP  - 118
SP  - 110
VL  - 189
DO  - 10.1016/j.apcatb.2016.02.039
ER  - 

@article{
author = "Obradovitc, M. D. and Stancic, Z. M. and Lačnjevac, Uroš and Radmilović, Velimir R and Gavrilovic-Wohlmuther, Aleksandra and Radmilović, Vuk V. and Gojković, Snežana Lj",
year = "2016",
abstract = "Pd-Ni/C catalyst was synthesized employing a borohydride reduction method. The high area Ni was first dispersed on the carbon support and then modified by Pd nanoparticles. Transmission electron microscopy confirmed relatively even distribution of Ni across the carbon support with discrete palladium particles of about 3.3 nm mean diameter on it. Cyclic voltammetry confirmed the presence of Ni on the catalyst surface. The activity of the Pd-Ni/C catalysts for ethanol oxidation reaction (EOR) in alkaline solution was tested under the potentiodynamic and potentiostatic conditions and the results were compared to those obtained on the Pd/C catalyst. It was found that Pd-Ni/C is more active for the EOR compared to Pd/C by a factor up to 3, depending on the type of experiments and whether specific activity or mass activity are considered. During the potentiodynamic stability test an interesting phenomenon of activation of Pd-Ni/C catalyst was observed. It was found that maximum activity is attained after fifty cycles with the positive potential limit of 1.2 V, regardless of whether they were performed in the electrolyte with or without ethanol. It was postulated that potential cycling of the Pd-Ni surface causes reorganization of the catalyst surface bringing Pd and Ni sites to a more suitable arrangement for the efficient ethanol oxidation.",
publisher = "Elsevier, Amsterdam",
journal = "Applied Catalysis B-Environmental",
title = "Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media",
pages = "118-110",
volume = "189",
doi = "10.1016/j.apcatb.2016.02.039"
}

Obradovitc, M. D., Stancic, Z. M., Lačnjevac, U., Radmilović, V. R., Gavrilovic-Wohlmuther, A., Radmilović, V. V.,& Gojković, S. L.. (2016). Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media. in Applied Catalysis B-Environmental
Elsevier, Amsterdam., 189, 110-118.
https://doi.org/10.1016/j.apcatb.2016.02.039

Obradovitc MD, Stancic ZM, Lačnjevac U, Radmilović VR, Gavrilovic-Wohlmuther A, Radmilović VV, Gojković SL. Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media. in Applied Catalysis B-Environmental. 2016;189:110-118.
doi:10.1016/j.apcatb.2016.02.039 .

Obradovitc, M. D., Stancic, Z. M., Lačnjevac, Uroš, Radmilović, Velimir R, Gavrilovic-Wohlmuther, Aleksandra, Radmilović, Vuk V., Gojković, Snežana Lj, "Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media" in Applied Catalysis B-Environmental, 189 (2016):110-118,
https://doi.org/10.1016/j.apcatb.2016.02.039 . .

TY  - JOUR
AU  - Lačnjevac, Uroš
AU  - Radmilović, Vuk V.
AU  - Radmilović, Velimir R
AU  - Krstajić, Nedeljko V
PY  - 2015
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/879
AB  - Nanocomposite cathodes for the hydrogen evolution reaction (HER) were prepared by deposition of RuOx catalyst particles on self-organized titania nanotube (TiNT) arrays of highly developed surface area, following a procedure that involved the initial cathodic intercalation of H+ into the TiNT walls and the subsequent two-step ion-exchange process. Transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS) analyses of obtained Ru-TiNT samples revealed that the concentration of RuOx particles in the size range of a few nanometers was the highest at the surface of the TiNT layer and steadily decreased to a minimum value at about 4.5 mu m inside the tubes. The capacitive behavior and electrocatalytic activity for the HER of Ru-TiNT nanocomposites, hydrogenated TiNT samples (H-TiNT) and compact TiO2 were investigated in 1.0 M HClO4 solution at room temperature by means of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Mott-Schottky analysis and steady-state polarization measurements. It was shown that cathodic hydrogenation treatment induced a four orders of magnitude higher concentration of electron donors in TiNT structures providing their quasimetallic behavior in the range of potentials corresponding to the HER. Ru-TiNT cathodes exhibited a more than 250 mV lower overpotential for the HER with respect to bare H-TiNT substrates at the current density of -50 mA cm (2). A decrease of the Tafel slope from about -120 mV/dec for H-TiNT samples to as low as -70 mV/dec for the Ru-TiNT sample with longer tubes was explained by the formal kinetics approach.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Electrochimica Acta
T1  - RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution
EP  - 190
SP  - 178
VL  - 168
DO  - 10.1016/j.electacta.2015.04.012
ER  - 

@article{
author = "Lačnjevac, Uroš and Radmilović, Vuk V. and Radmilović, Velimir R and Krstajić, Nedeljko V",
year = "2015",
abstract = "Nanocomposite cathodes for the hydrogen evolution reaction (HER) were prepared by deposition of RuOx catalyst particles on self-organized titania nanotube (TiNT) arrays of highly developed surface area, following a procedure that involved the initial cathodic intercalation of H+ into the TiNT walls and the subsequent two-step ion-exchange process. Transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS) analyses of obtained Ru-TiNT samples revealed that the concentration of RuOx particles in the size range of a few nanometers was the highest at the surface of the TiNT layer and steadily decreased to a minimum value at about 4.5 mu m inside the tubes. The capacitive behavior and electrocatalytic activity for the HER of Ru-TiNT nanocomposites, hydrogenated TiNT samples (H-TiNT) and compact TiO2 were investigated in 1.0 M HClO4 solution at room temperature by means of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Mott-Schottky analysis and steady-state polarization measurements. It was shown that cathodic hydrogenation treatment induced a four orders of magnitude higher concentration of electron donors in TiNT structures providing their quasimetallic behavior in the range of potentials corresponding to the HER. Ru-TiNT cathodes exhibited a more than 250 mV lower overpotential for the HER with respect to bare H-TiNT substrates at the current density of -50 mA cm (2). A decrease of the Tafel slope from about -120 mV/dec for H-TiNT samples to as low as -70 mV/dec for the Ru-TiNT sample with longer tubes was explained by the formal kinetics approach.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Electrochimica Acta",
title = "RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution",
pages = "190-178",
volume = "168",
doi = "10.1016/j.electacta.2015.04.012"
}

Lačnjevac, U., Radmilović, V. V., Radmilović, V. R.,& Krstajić, N. V.. (2015). RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution. in Electrochimica Acta
Pergamon-Elsevier Science Ltd, Oxford., 168, 178-190.
https://doi.org/10.1016/j.electacta.2015.04.012

Lačnjevac U, Radmilović VV, Radmilović VR, Krstajić NV. RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution. in Electrochimica Acta. 2015;168:178-190.
doi:10.1016/j.electacta.2015.04.012 .

Lačnjevac, Uroš, Radmilović, Vuk V., Radmilović, Velimir R, Krstajić, Nedeljko V, "RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution" in Electrochimica Acta, 168 (2015):178-190,
https://doi.org/10.1016/j.electacta.2015.04.012 . .