TY  - JOUR
AU  - Jović, Borka M
AU  - Jović, Vladimir D
AU  - Branković, Goran
AU  - Radović, M.
AU  - Krstajić, Nedeljko V
PY  - 2017
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1034
AB  - The hydrogen evolution reaction (HER) was studied in 0.5 M H2SO4 at 25 degrees C on Pd electrodeposited onto Ti2AlC substrate, as an excellent substrate due to its high conductivity and high stability in concentrated sulfuric acid. Pd was electrodeposited onto Ti2AlC by pulse technique from the solutions containing different concentrations of PdCl2 in 1 M NH4Cl. It was shown that in all investigated solutions Pd electrodeposition occurs by the diffusion-controlled 3D nucleation and growth. Two types of Pd electrodeposits were submitted to the study of the HER by the polarization measurements and the electrochemical impedance spectroscopy (EIS). The surface of Pd samples was characterized by scanning electron microscopy (SEM), by energy dispersive X-ray spectroscopy (EDS) and by atomic force microscopy (AFM). High catalytic activity for the HER was observed for all investigated samples. The Tafel slope of -64 mV dec(-1) was recorded for the Pd layer electrodeposited at 20 mV vs. saturated calomel electrode (SCE) for 5 s, mainly composed of isolated hemispherical 3D Pd centers and dendrites (sample (2)), while for Pd electrodeposit with the theoretical thickness of 1000 nm (sample (1)) Tafel slope of -143 mV dec(-1) was detected. All Tafel slopes recorded for the investigated samples could be explained by the Volmer-Tafel mechanism for the HER assuming Temkin adsorption isotherm, with either of the steps (Volmer or Tafel step) being the rate-determining one. By the analysis of the EIS results similar slopes for the E vs. log (R-F)(-1) dependences were observed for all investigated samples respectively, while the electrochemically active surface area (EASA), obtained by the integration of the charge for Pd-oxide reduction was found to be the highest for the sample (1). The exchange current densities corrected for the EASA were presented for all samples.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Electrochimica Acta
T1  - Hydrogen evolution in acid solution at Pd electrodeposited onto Ti2AlC
EP  - 584
SP  - 571
VL  - 224
DO  - 10.1016/j.electacta.2016.12.015
ER  - 

@article{
author = "Jović, Borka M and Jović, Vladimir D and Branković, Goran and Radović, M. and Krstajić, Nedeljko V",
year = "2017",
abstract = "The hydrogen evolution reaction (HER) was studied in 0.5 M H2SO4 at 25 degrees C on Pd electrodeposited onto Ti2AlC substrate, as an excellent substrate due to its high conductivity and high stability in concentrated sulfuric acid. Pd was electrodeposited onto Ti2AlC by pulse technique from the solutions containing different concentrations of PdCl2 in 1 M NH4Cl. It was shown that in all investigated solutions Pd electrodeposition occurs by the diffusion-controlled 3D nucleation and growth. Two types of Pd electrodeposits were submitted to the study of the HER by the polarization measurements and the electrochemical impedance spectroscopy (EIS). The surface of Pd samples was characterized by scanning electron microscopy (SEM), by energy dispersive X-ray spectroscopy (EDS) and by atomic force microscopy (AFM). High catalytic activity for the HER was observed for all investigated samples. The Tafel slope of -64 mV dec(-1) was recorded for the Pd layer electrodeposited at 20 mV vs. saturated calomel electrode (SCE) for 5 s, mainly composed of isolated hemispherical 3D Pd centers and dendrites (sample (2)), while for Pd electrodeposit with the theoretical thickness of 1000 nm (sample (1)) Tafel slope of -143 mV dec(-1) was detected. All Tafel slopes recorded for the investigated samples could be explained by the Volmer-Tafel mechanism for the HER assuming Temkin adsorption isotherm, with either of the steps (Volmer or Tafel step) being the rate-determining one. By the analysis of the EIS results similar slopes for the E vs. log (R-F)(-1) dependences were observed for all investigated samples respectively, while the electrochemically active surface area (EASA), obtained by the integration of the charge for Pd-oxide reduction was found to be the highest for the sample (1). The exchange current densities corrected for the EASA were presented for all samples.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Electrochimica Acta",
title = "Hydrogen evolution in acid solution at Pd electrodeposited onto Ti2AlC",
pages = "584-571",
volume = "224",
doi = "10.1016/j.electacta.2016.12.015"
}

Jović, B. M., Jović, V. D., Branković, G., Radović, M.,& Krstajić, N. V.. (2017). Hydrogen evolution in acid solution at Pd electrodeposited onto Ti2AlC. in Electrochimica Acta
Pergamon-Elsevier Science Ltd, Oxford., 224, 571-584.
https://doi.org/10.1016/j.electacta.2016.12.015

Jović BM, Jović VD, Branković G, Radović M, Krstajić NV. Hydrogen evolution in acid solution at Pd electrodeposited onto Ti2AlC. in Electrochimica Acta. 2017;224:571-584.
doi:10.1016/j.electacta.2016.12.015 .

Jović, Borka M, Jović, Vladimir D, Branković, Goran, Radović, M., Krstajić, Nedeljko V, "Hydrogen evolution in acid solution at Pd electrodeposited onto Ti2AlC" in Electrochimica Acta, 224 (2017):571-584,
https://doi.org/10.1016/j.electacta.2016.12.015 . .

TY  - JOUR
AU  - Jović, Borka M
AU  - Jović, Vladimir D
AU  - Lačnjevac, Uroš
AU  - Stevanović, Sanja I.
AU  - Kovač, Janez
AU  - Radović, M.
AU  - Krstajić, Nedeljko V
PY  - 2016
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/943
AB  - In this work, the hydrogen evolution reaction (HER) was studied on Ru coated Ti2AlC electrodes in 1.0 mol dm(-3) H2SO4 at 25 degrees C. Ti2AlC was found to be a highly stable substrate in sulfuric acid solutions due to the formation of a passivating oxide layer on the surface, which was confirmed by the X-ray photoelectron spectroscopy (XPS) analysis of as-prepared and anodically treated Ti2AlC samples. Ru films were electrodeposited onto Ti2AlC substrates by cycling the potential of Ti2AlC in the solution containing 0.01 mol dm(-3) RuCl3 + 0.1 mol dm(-3) H2SO4 between -0.5 V and 0.4 V vs. a saturated calomel electrode (SCE) at the sweep rate of 20 mV s(-1). Four Ru/Ti2AlC samples were prepared, obtained at 5, 10, 15 and 20 cycles of Ru electrodeposition. Characterization of samples was performed by scanning electron microscopy (SEM) and cyclic voltammetry (CV), while the thickness of the electrodeposited Ru layers was determined by atomic force microscopy (AFM). It was found that the most compact sample with the thickness of about 0.42 mu m was obtained after 5 cycles. Electrochemical impedance spectroscopy (EIS) and steady-state polarization measurements showed that all Ru/Ti2AlC electrodes were exceptionally active for the HER. A Tafel slope of about -60 mV dec(-1) was observed on all polarization curves in the range of high cathodic current densities. Based on formal kinetics analysis, an appropriate mechanism for the HER on Ru/Ti2AlC was suggested.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Electroanalytical Chemistry
T1  - Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions
EP  - 86
SP  - 78
VL  - 766
DO  - 10.1016/j.jelechem.2016.01.038
ER  - 

@article{
author = "Jović, Borka M and Jović, Vladimir D and Lačnjevac, Uroš and Stevanović, Sanja I. and Kovač, Janez and Radović, M. and Krstajić, Nedeljko V",
year = "2016",
abstract = "In this work, the hydrogen evolution reaction (HER) was studied on Ru coated Ti2AlC electrodes in 1.0 mol dm(-3) H2SO4 at 25 degrees C. Ti2AlC was found to be a highly stable substrate in sulfuric acid solutions due to the formation of a passivating oxide layer on the surface, which was confirmed by the X-ray photoelectron spectroscopy (XPS) analysis of as-prepared and anodically treated Ti2AlC samples. Ru films were electrodeposited onto Ti2AlC substrates by cycling the potential of Ti2AlC in the solution containing 0.01 mol dm(-3) RuCl3 + 0.1 mol dm(-3) H2SO4 between -0.5 V and 0.4 V vs. a saturated calomel electrode (SCE) at the sweep rate of 20 mV s(-1). Four Ru/Ti2AlC samples were prepared, obtained at 5, 10, 15 and 20 cycles of Ru electrodeposition. Characterization of samples was performed by scanning electron microscopy (SEM) and cyclic voltammetry (CV), while the thickness of the electrodeposited Ru layers was determined by atomic force microscopy (AFM). It was found that the most compact sample with the thickness of about 0.42 mu m was obtained after 5 cycles. Electrochemical impedance spectroscopy (EIS) and steady-state polarization measurements showed that all Ru/Ti2AlC electrodes were exceptionally active for the HER. A Tafel slope of about -60 mV dec(-1) was observed on all polarization curves in the range of high cathodic current densities. Based on formal kinetics analysis, an appropriate mechanism for the HER on Ru/Ti2AlC was suggested.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Electroanalytical Chemistry",
title = "Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions",
pages = "86-78",
volume = "766",
doi = "10.1016/j.jelechem.2016.01.038"
}

Jović, B. M., Jović, V. D., Lačnjevac, U., Stevanović, S. I., Kovač, J., Radović, M.,& Krstajić, N. V.. (2016). Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions. in Journal of Electroanalytical Chemistry
Elsevier Science Sa, Lausanne., 766, 78-86.
https://doi.org/10.1016/j.jelechem.2016.01.038

Jović BM, Jović VD, Lačnjevac U, Stevanović SI, Kovač J, Radović M, Krstajić NV. Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions. in Journal of Electroanalytical Chemistry. 2016;766:78-86.
doi:10.1016/j.jelechem.2016.01.038 .

Jović, Borka M, Jović, Vladimir D, Lačnjevac, Uroš, Stevanović, Sanja I., Kovač, Janez, Radović, M., Krstajić, Nedeljko V, "Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions" in Journal of Electroanalytical Chemistry, 766 (2016):78-86,
https://doi.org/10.1016/j.jelechem.2016.01.038 . .

TY  - JOUR
AU  - Dapčević, Aleksandra
AU  - Poleti, Dejan
AU  - Rogan, Jelena
AU  - Radojković, Aleksandar
AU  - Radović, M.
AU  - Branković, Goran
PY  - 2015
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/840
AB  - The possibility to stabilize the delta-Bi2O3-type polymorph with high ionic conductivity by doping with Tm2O3 was investigated in this study. Five microaystalline samples were synthesized at 750 degrees C from alpha-Bi2O3 and Tm2O3 mixtures with compositions (Bi1-xTmx)(2)O-3, where x = 0.04, 0.08, 0.11, 0.14 and 0.20. The XRD, SEM, HRTEM and SAED results showed that the targeted delta-Bi2O3-type single-phase (space group Fm (3) over barm) was formed for 0.11  lt = x  lt = 0.20. The unit cell parameter of delta-Bi2O3-type phase decreases with increase in Tm content. According to DTA, no phase transitions were observed in the sample with x = 020, indicating that the obtained delta-Bi2O3-type phase is structurally stable from room temperature to 985 degrees C. Based on EIS, (Bi0.80Tm0.20)(2)O-3 exhibits high conductivity (0.117 S cm(-1) at 550 degrees C) with activation energies: 0.38(4) eV above 550 degrees C and 127(2) eV below 550 degrees C, due to the change in charge carrier mobility. The effect of thermal aging was investigated and discussed.
PB  - Elsevier Science Bv, Amsterdam
T2  - Solid State Ionics
T1  - A new electrolyte based on Tm3+-doped delta-Bi2O3-type phase with enhanced conductivity
EP  - 23
SP  - 18
VL  - 280
DO  - 10.1016/j.ssi.2015.08.004
ER  - 

@article{
author = "Dapčević, Aleksandra and Poleti, Dejan and Rogan, Jelena and Radojković, Aleksandar and Radović, M. and Branković, Goran",
year = "2015",
abstract = "The possibility to stabilize the delta-Bi2O3-type polymorph with high ionic conductivity by doping with Tm2O3 was investigated in this study. Five microaystalline samples were synthesized at 750 degrees C from alpha-Bi2O3 and Tm2O3 mixtures with compositions (Bi1-xTmx)(2)O-3, where x = 0.04, 0.08, 0.11, 0.14 and 0.20. The XRD, SEM, HRTEM and SAED results showed that the targeted delta-Bi2O3-type single-phase (space group Fm (3) over barm) was formed for 0.11  lt = x  lt = 0.20. The unit cell parameter of delta-Bi2O3-type phase decreases with increase in Tm content. According to DTA, no phase transitions were observed in the sample with x = 020, indicating that the obtained delta-Bi2O3-type phase is structurally stable from room temperature to 985 degrees C. Based on EIS, (Bi0.80Tm0.20)(2)O-3 exhibits high conductivity (0.117 S cm(-1) at 550 degrees C) with activation energies: 0.38(4) eV above 550 degrees C and 127(2) eV below 550 degrees C, due to the change in charge carrier mobility. The effect of thermal aging was investigated and discussed.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Solid State Ionics",
title = "A new electrolyte based on Tm3+-doped delta-Bi2O3-type phase with enhanced conductivity",
pages = "23-18",
volume = "280",
doi = "10.1016/j.ssi.2015.08.004"
}

Dapčević, A., Poleti, D., Rogan, J., Radojković, A., Radović, M.,& Branković, G.. (2015). A new electrolyte based on Tm3+-doped delta-Bi2O3-type phase with enhanced conductivity. in Solid State Ionics
Elsevier Science Bv, Amsterdam., 280, 18-23.
https://doi.org/10.1016/j.ssi.2015.08.004

Dapčević A, Poleti D, Rogan J, Radojković A, Radović M, Branković G. A new electrolyte based on Tm3+-doped delta-Bi2O3-type phase with enhanced conductivity. in Solid State Ionics. 2015;280:18-23.
doi:10.1016/j.ssi.2015.08.004 .

Dapčević, Aleksandra, Poleti, Dejan, Rogan, Jelena, Radojković, Aleksandar, Radović, M., Branković, Goran, "A new electrolyte based on Tm3+-doped delta-Bi2O3-type phase with enhanced conductivity" in Solid State Ionics, 280 (2015):18-23,
https://doi.org/10.1016/j.ssi.2015.08.004 . .

TY  - JOUR
AU  - Matović, Branko
AU  - Dohcević-Mitrović, Zorana
AU  - Radović, M.
AU  - Branković, Zorica
AU  - Branković, Goran
AU  - Bošković, Snežana B
AU  - Popović, Z. V.
PY  - 2009
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/340
AB  - Nanopowdered solid solution Ce(1-x)Fe(x)O(2-delta) samples (0  lt = x  lt = 0.1) were synthesized by a self-propagating room temperature synthesis (SPRT). XRD and Raman spectroscopy at room temperature were used to study the vibrational properties of these materials as well as the Fe solubility in ceria lattice. Results show that all obtained powders are solid solutions with a fluorite-type crystal structure and all powders were nanometric in size. The average size of Ce(1-x)Fe(x)O(2-delta) particles lies about 5 nm. The results of electrical properties of the sintered samples investigated by an ac impedance spectroscopy are also presented and discussed. It was confirmed that Fe(3+) doped ceria material has a potential as electrolyte for intermediate-temperature solid oxide fuel cell applications.
PB  - Elsevier Science Bv, Amsterdam
T2  - Journal of Power Sources
T1  - Synthesis and characterization of ceria based nanometric powders
EP  - 149
IS  - 1
SP  - 146
VL  - 193
DO  - 10.1016/j.jpowsour.2009.03.053
ER  - 

@article{
author = "Matović, Branko and Dohcević-Mitrović, Zorana and Radović, M. and Branković, Zorica and Branković, Goran and Bošković, Snežana B and Popović, Z. V.",
year = "2009",
abstract = "Nanopowdered solid solution Ce(1-x)Fe(x)O(2-delta) samples (0  lt = x  lt = 0.1) were synthesized by a self-propagating room temperature synthesis (SPRT). XRD and Raman spectroscopy at room temperature were used to study the vibrational properties of these materials as well as the Fe solubility in ceria lattice. Results show that all obtained powders are solid solutions with a fluorite-type crystal structure and all powders were nanometric in size. The average size of Ce(1-x)Fe(x)O(2-delta) particles lies about 5 nm. The results of electrical properties of the sintered samples investigated by an ac impedance spectroscopy are also presented and discussed. It was confirmed that Fe(3+) doped ceria material has a potential as electrolyte for intermediate-temperature solid oxide fuel cell applications.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Journal of Power Sources",
title = "Synthesis and characterization of ceria based nanometric powders",
pages = "149-146",
number = "1",
volume = "193",
doi = "10.1016/j.jpowsour.2009.03.053"
}

Matović, B., Dohcević-Mitrović, Z., Radović, M., Branković, Z., Branković, G., Bošković, S. B.,& Popović, Z. V.. (2009). Synthesis and characterization of ceria based nanometric powders. in Journal of Power Sources
Elsevier Science Bv, Amsterdam., 193(1), 146-149.
https://doi.org/10.1016/j.jpowsour.2009.03.053

Matović B, Dohcević-Mitrović Z, Radović M, Branković Z, Branković G, Bošković SB, Popović ZV. Synthesis and characterization of ceria based nanometric powders. in Journal of Power Sources. 2009;193(1):146-149.
doi:10.1016/j.jpowsour.2009.03.053 .

Matović, Branko, Dohcević-Mitrović, Zorana, Radović, M., Branković, Zorica, Branković, Goran, Bošković, Snežana B, Popović, Z. V., "Synthesis and characterization of ceria based nanometric powders" in Journal of Power Sources, 193, no. 1 (2009):146-149,
https://doi.org/10.1016/j.jpowsour.2009.03.053 . .