Vladimir Panić

University of Belgrade

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Aleksandar Dekanski

Karolinska Institutet

Vesna Mišković‐Stanković

Univerzitet Union Nikola Tesla

S.K. Milonjić

Vinča Institute of Nuclear Sciences

Jasmina Stevanović

Oncology Institute of Vojvodina

Branislav Nikolić

University of Belgrade

Milica Košević

University of Belgrade

Miroslav M. Pavlović

University of Belgrade

Srečko Stopić

RWTH Aachen University

Bernd Friedrich

RWTH Aachen University

Božidar Nikolić

University of Belgrade

Cooperative Institutions

University of Belgrade

Institute of Chemistry, Technology and Metallurgy

Institute for Technology of Nuclear and other Mineral Raw Materials

Vinča Institute of Nuclear Sciences

Centre of Research Excellence in Nutrition and Metabolism

Institut za filozofiju

Institute of Economic Sciences

Institute of Chemistry

Institute of Metallurgy

University of Belgrade – Faculty of Technology and Metallurgy

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Nonlinear Frequency Response Analysis of the Ferrocyanide Oxidation Kinetics. Part I. A Theoretical Analysis

The Journal of Physical Chemistry C (2011)

Tanja Vidaković‐Koch Vladimir Panić Milan Andrić Menka Petkovska Kai Sundmacher

In this work, a nonlinear frequency response (NLFR) analysis was used for a first time in a theoretical study of nonlinear behavior of electrochemical (EC) ferrocyanide oxidation as a simple model reaction. Analytical expressions of the first- and second-order frequency response functions (FRFs) are derived. The first-order FRF is equivalent to the EC admittance and contains information about the linear behavior of the system, whereas the second-order FRF contains additional nonlinear information. The influence of different parameters, such as the heterogeneous rate constant, solution resistance, double-layer capacitance, diffusion coefficients of the reacting species, and electrode rotation rate on the characteristics of the first- and second-order FRFs was checked and discussed. It was found that the second-order FRF is more sensitive to the changes of the studied parameters than the first-order FRF. Experimental verification of the NLFR analysis of EC ferrocyanide oxidation is presented in Part II of this work.

Admittance

Ferrocyanide

Time constant

10.1021/jp201297v

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Citations (31)

On the deactivation mechanism of RuO2–TiO2/Ti anodes prepared by the sol–gel procedure

Journal of Electroanalytical Chemistry (2005)

Vladimir Panić Aleksandar Dekanski Vesna Mišković‐Stanković S.K. Milonjić Biljana Nikolić

Thermal Stability

10.1016/j.jelechem.2005.01.026

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Citations (74)

Relationships between structure and activity of carbon as a multifunctional support for electrocatalysts

Physical Chemistry Chemical Physics (2012)

Sanja Stevanović Vladimir Panić Aleksandar Dekanski A.V. Tripković Vladislava M. Jovanović

We report on new insights into the relationships between structure and activity of glassy carbon (GC), as a model material for electrocatalyst support, during its anodization in acid solution. Our investigation strongly confirms the role of CFGs in promotion of Pt activity by the "spill-over" effect related to CO(ads) for methanol electrooxidation (MEO) on a carbon-supported Pt catalyst. Combined analysis of voltammetric and impedance behaviour as well as changes in GC surface morphology induced by intensification of anodizing conditions reveal an intrinsic influence of the carbon functionalization and the structure of a graphene oxide (GO) layer on the electrical and electrocatalytic properties of activated GC. Although GO continuously grows during anodization, it structurally changes from being a graphite inter-layer within graphite ribbons toward a continuous GO surface layer that deteriorates the native structure of GC. As a consequence of the increased distance between GO-spaced graphite layers, the GC conductivity decreases until the case of profound GO exfoliation under drastic anodizing conditions. This exposes the native, yet abundantly functionalized, GC texture. While GC capacitance continuously increases with intensification of anodizing conditions, the surface nano-roughness and GO resistance reach the highest values at modest anodizing conditions, and then decrease upon drastic anodization due to the onset of GO exfoliation. We found for the first time that the activity of a GC-supported Pt catalyst in MEO, as one of the promising half-reactions in polymer electrolyte fuel cells, strictly follows the changes in GC nano-roughness and GO-induced GC resistance. The highest GC/Pt MEO activity is reached when optimal distance between graphite layers and optimal degree of GC functionalization bring the highest amount of CFGs into intimate contact with the Pt surface. This confirms the promoting role of CFGs in MEO catalysis.

Anodizing

Exfoliation joint

Glassy carbon

Carbon fibers

10.1039/c2cp40455a

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Citations (18)

Virtuelna laboratorija model Chemlab (www.modelscience.COM)

Aleksandar Dekanski Vladimir Panić Dragana Dekanski

Source

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The Influence of the Aging Time of RuO<sub>2</sub> Sol on the Electrochemical Properties of the Activated Titanium Anodes Obtained by Sol-Gel Procedure

Materials science forum (2000)

Vladimir Panić Aleksandar Dekanski S.K. Milonjić Radoslav Atanasoski Božidar Nikolić

The influence of the aging time of RuO 2 sol on the electrochemical properties and behaviour in chlorine evolution reaction of RuO 2 /Ti and (40%RuO 2 + 60%TiO 2 )/Ti anodes obtained by sol-gel procedure was studied. The electrochemically active surface area of the anode coatings was examined by cyclic voltammetry. The electrocatalytic activity and anode stability in chlorine evolution reaction were investigated by polarization measurements and accelerated stability test. The dependence of electrochemical properties of obtained activated titanium anodes on RuO 2 particle size was established.

10.4028/www.scientific.net/msf.352.117

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Citations (8)

Sol-gel prepared active ternary oxide coating on titanium in cathodic protection

Journal of the Serbian Chemical Society (2007)

Vladimir Panić Branislav Nikolić

The characteristics of a ternary oxide coating, on titanium, which consisted of TiO2, RuO2 and IrO2 in the molar ratio 0.6:0.3:0.1, calculated on the metal atom, were investigated for potential application for cathodic protection in a seawater environment. The oxide coatings on titanium were prepared by the sol-gel procedure from a mixture of inorganic oxide sols, which were obtained by forced hydrolysis of metal chlorides. The morphology of the coating was examined by scanning electron microscopy. The electrochemical properties of activated titanium anodes were investigated by cyclic voltammetry and polarization measurements in a H2SO4- and NaCl-containing electrolyte, as well as in seawater sampled on the Adriatic coast in Tivat, Montenegro. The anode stability during operation in seawater was investigated by the galvanostatic accelerated corrosion stability test. The morphology and electrochemical characteristics of the ternary coating are compared to that of a sol-gel-prepared binary Ti0.6Ru0.4O2 coating. The activity of the ternary coating was similar to that of the binary Ti0.6Ru0.4O2 coating in the investigated solutions. However, the stability in seawater is found to be considerably greater for the ternary coating.

Artificial seawater

10.2298/jsc0712393p

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Electrocatalytic and capacitive properties of ruthenium oxide based electrodes

Vladimir Panić

Aktivirane titanske anode, Ti/RuO2 TiO2, i RuO2/ugljenicni kompoziti dobijeni su sol gel postupkom od neorganskih oksidnih solova. RuO2 i TiO2 solovi dobijeni su forsiranom hidrolizom RuCl3 u vodenom rastvoru HCl. Morfologija dobijenih solova ispitivana je transmisionom elektronskom mikroskopijom. Hemijski satav RuO2 sola i od njega dobijenih RuO2/ugljenicnih kompozita impregnacijom komercijalnih ugljenicnih prahova ispitivana je difrakcijom x zraka i termogravimetrijskom analizom. Ova ispitivanja pokazuju da su sitne oksidne cestice sacinjene od hidratisanog oksida. Morfologija kompozita i ugljenicnih prahova ispitivana je skenirajucom elektronskom mikroskopijom koja ukazuje na prisustvo oksida u impregniranom ugljenicnom prahu. Mehanizam gubitka elektrokataliticke aktivnosti Ti/RuO2 TiO2 anoda ispitivan je pracenjem promena elektrohemijskih svojstava anode u reakcijama izdvajanja hlora i kiseonika, kao i na potencijalu otvorenog kola, u rastvorima NaCl i H2SO4 tokom degradacije anode. Ove elektrohemijske karakteristike anode ispitivane su metodama ciklicne voltametrije, spektroskopije elektrohemijske impedancije i polarizacionim mere¬njima. Stabilnost anoda je ispitivana ubrzanim testom stabilnosti u ras¬tvoru NaCl. Promene u elektrohemijskim svojstvima anode dobijene sol gel postupkom pore¬đene su sa promenama koje su registrovane za Ti/RuO2 TiO2 anodu dobijenu tradicionalnim postupkom termicke razgradnje hlorida metala. Na osnovu pomenutih ispitivanja proizilazi da je osnovni uzrok gubitka elektro¬kataliticke aktivnosti anode dobijene sol gel postupkom elek¬trohemijsko rastvaranje RuO2, dok je uzrok degradacije anode dobijene termickom razgra-dnjom rast neprovodnog TiO2 sloja u međufazi prevlaka/titanska podloga. Aktivnost Ti/RuO2 TiO2 anoda za reakciju oksidacije fenola ispitivana je u kiselom ras¬tvoru metodama ciklicne voltametrije, hronoamperometrije i polarizacionim merenjima. Ustanovljeno je da se ova reakcija odigrava preko dva reakciona puta, koji daju polioksifenilenski film na povrsini anode i rastvorne hinonska jedinjenja kao krajnje proizvode reakcije. Polioksifenilenski film inhibira reakciju oksidacije fenola. Karakteristike filma ispitivane su metodom spektro¬skopije elektrohemijske impedancije. Kapacitivne karakteristike RuO2/ugljenicnog kompozita ispitivane su metodama ciklicne voltametrije i spektroskopije elektrohemijske impedancije u rastvoru H2SO4. Kapacitivnost i raspodela kapacitivnosti kroz porozni sloj kompozita zavise od realne povrsine ugljenicnog substrata i od koncentracije oksidne faze u impregnirajucoj sredini, kao i od vremena formiranja oksidnog sola koriscenog za impregnaciju.

Ruthenium oxide

10.2298/bg20051216panic

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Titanium coated with high-performance nanocrystalline ruthenium oxide synthesized by the microwave-assisted sol–gel procedure

Journal of Solid State Electrochemistry (2016)

Gavrilo Šekularac Milica Košević Ivana Drvenica Aleksandar Dekanski Vladimir Panić

Ruthenium oxide

Nanocrystalline material

10.1007/s10008-016-3343-z

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Citations (7)