Nicolae Vaszilcsin

Polytechnic University of Timişoara

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Co-Authors

Mircea Laurențiu Dan

Polytechnic University of Timişoara

Andrea Kellenberger

Polytechnic University of Timişoara

Delia-Andrada Duca

Polytechnic University of Timişoara

Florica Manea

Polytechnic University of Timişoara

Narcis Duțeanu

Polytechnic University of Timişoara

Roxana Muntean

Polytechnic University of Timişoara

Delia Andrada Duca

Polytechnic University of Timişoara

J. Schoonman

Delft University of Technology

Mihaela-Alexandra Lăboșel

Polytechnic University of Timişoara

Gabriela Mărginean

University of Applied Sciences for Public Administration and Management

Cooperative Institutions

Polytechnic University of Timişoara

National Institute of Research and Development for Electrochemistry and Condensed

Gheorghe Asachi Technical University of Iași

West University of Timişoara

Romanian Academy

Japan External Trade Organization

Westfälische Hochschule

Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)

Centre National de la Recherche Scientifique

Spitalul Clinic Judeţean de Urgenţă "Pius Brînzeu" Timişoara

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Electrochemical Evaluation of Niobium Corrosion Resistance in Simulated Anodic PEM Electrolyzer Environment

International Journal of Electrochemical Science (2020)

Andrea Kellenberger Delia Andrada Duca Nicolae Vaszilcsin Corneliu Marius Crăciunescu

10.20964/2020.11.47

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Citations (14)

Expired drugs as inhibitors in electrochemical processes – a mini-review

Studia Universitatis Babeș-Bolyai Chemia (2019)

Nicolae Vaszilcsin Delia-Andrada Duca Adriana Flueraş Mircea Laurențiu Dan

Inhibitors of electrochemical processes have useful applications in corrosion protection of metals and alloys, as well as in galvanotechnics as levellers for the cathodic metal deposition.Active substances of drugs are good inhibitors, taking into account that they have in their molecules structures containing π electrons or lone pair electrons, being able to adsorb on the metal surfaces through weak physical or strong chemical interactions.Significant inhibition efficiency of several drugs have been proved many years ago, but unfortunately, drugs are expensive and their practical applications as corrosion inhibitors for metal and alloys has been delayed.In the present papers, the studies on the inhibition properties in metal corrosion processes of expired drugs have been emphasized, starting with the paper of R. S. Abdel Hameed, published in 2009.There are few studies on the expired drugs used as levellers in the cathodic metal deposition.

Deposition

Lone pair

10.24193/subbchem.2019.3.02

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Citations (25)

Voltammetric/amperometric detection of salicylic acid in water on carbon nanotubes-epoxy composite electrodes

WIT transactions on the built environment (2015)

Adriana Iacob Florica Manea J. Schoonman Nicolae Vaszilcsin

This study aimed to develop the detection protocol for the quantitative determination of salicylic acid (SA) in water.A carbon nanotubes-epoxy composite (CNTE) electrode was tested for the development of the SA detection protocol.The electrochemical behaviour of SA on a CNTE electrode has been studied using the cyclic voltammetry (CV) technique.Also, the study of pH effect by CV showed that no significant effect was found.Differential-pulsed voltammetry (DPV) and square-wave voltammetry (SWV) techniques were employed for the optimization of the detection protocol.The optimized SWV technique application assumes the step potential of 0.005 V, the modulation amplitude of 0.05 V and the frequency of 50 Hz.In order to use this detection protocol for the in-field detection application, the possibility of using this composite electrode in real surface water without adding the supporting electrolyte has been tested.The same electroanalytical parameters for SA detection in real surface water and tap water were achieved without any interference, which denotes the microelectrode array behaviour of the composite electrode.This behaviour confers a great potential of this composite electrode for in-field direct detection of salicylic acid and also, for the indirect detection of acetylsalicylic acid from surface water.

Amperometry

Differential pulse voltammetry

10.2495/sd150481

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Citations (1)

Enhancement of Hydrogen Evolution Reaction on Pt-Co Layer Deposited on Copper

IOP Conference Series Materials Science and Engineering (2018)

Delia-Andrada Duca Mircea Laurențiu Dan A Z Vidinaru Roxana Muntean Nicolae Vaszilcsin

Hydrogen is still considered an excellent energy carrier and fuel of the future, since in the combustion process only water is produced, without carbon dioxide. Whereas, water splitting by electrolysis is indeed a green procedure for hydrogen production, the research on hydrogen evolution reaction (HER) is focused especially on the catalytic activity of cathodic materials. In this paper, Pt-Co alloy deposition on copper substrate as catalyst for HER is presented. Pt-Co alloy has been obtained using pulsed plating current technique in order to achieve a uniform dispersion of Pt-Co particles onto the metal surface. Morphological and structural characterization of the obtained layers has been carried out by scanning electron microscopy and XR diffractometry. Electrochemical behaviour and stability of the electrocatalytic Pt-Co layers has been emphasised by cyclic voltammetry. Further, kinetic parameters for cathodic HER have been determined by Tafel plots method in alkaline solutions. Exchange current density io, as well as cathodic transfer coefficient 1-α, revealed an increased catalytic activity in the temperature range of 25 – 65°C.

Exchange current density

Electrolysis of water

10.1088/1757-899x/416/1/012033

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Studies on the possibility of using expired ceftriaxone drug as additive in acid electroplating baths

Delia-Andrada Duca Nicolae Vaszilcsin Mircea Laurențiu Dan

In this paper, preliminary data obtained using ceftriaxone (CEFTR) as additive in copper and nickel electrodeposition from acid baths are presented. Electrochemical behaviour of ceftriaxone and introductory information about the way its presence in the metalselectrodeposition bath influences the electrode processes have been obtained by cyclic voltammetry on platinum electrode. Inhibitory effect of ceftriaxone in the electrolyte solutions used in copper and nickel deposition processes was studied by linear voltammetry.

Deposition

Linear sweep voltammetry

Source

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Electrical properties optimization of silver nanowires supported on polyethylene terephthalate

Particulate Science And Technology (2015)

Radu Banică Daniel Ursu Paula Svera Claudia Sarvas Florina Ștefania Rus

The aim of this study is the enhancement of the electrical properties of thin films obtained from silver nanowires (AgNWs) deposited on a flexible polyethylene terephthalate (PET) support. First, AgNWs were obtained by the "polyol" liquid phase synthesis method in the presence of chloride ions. After purification, the AgNWs were successively deposited on a flexible support of PET by doctor blade method. To improve the adhesion of the AgNWs coating to the substrate, thin films of polymethyl methacrylate (PMMA) were interposed between the layer of AgNWs and PET substrate. The properties of the thin films have been studied depending on the number of AgNWs layers and heat treatment procedure. Characterization of pure AgNWs as well as of AgNWs/PMMA/PET structures has been carried out by x-ray diffraction, scanning electron microscopy, energy-dispersive x-ray analysis, transmission electron microscopy, UV–Vis spectroscopy, and scanning probe microscopy. The sheet resistance of the transparent conducting films was determined by four point probe measurement. Best results in terms of homogenous conductance across the film and optical transmittance have been obtained for samples prepared by deposition of four successive layers of AgNWs. Further heat treatment improved the conductivity of AgNWs on the PMMA/PET substrate. For these films, the sheet resistance decreased from 41.25 to 29.55 Ω/sq after 40 min of heat treatment in air at 150°C.

10.1080/02726351.2015.1066473

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Citations (5)

Calcium-Doped Y114 Layered Cobalt Perovskite, a Promising Anodic Material for Direct Methanol Fuel Cell

Advanced engineering forum (2018)

Victor Daniel Craia-Joldes Mircea Laurențiu Dan Delia Andrada Duca Nicolae Vaszilcsin

In this paper, calcium doped cobalt layered perovskite type 114 electrode electrocatalytic activity for methanol oxidation reaction (MOR) in aqueous alkaline solution (1 M KOH) has been investigated in order to find the relationship between methanol concentration in the solution and oxidation potential, current density, and oxidation efficiency. For a complete characterization of MOR on this electrode, several electrochemical methods were used: chronoamperometry, chronopotentiometry, chronocoulometry. Also, in order to understand the oxidation mechanism, kinetic parameters were determined using Tafel method and electrochemical impedance spectroscopy (EIS) was performed. MOR on layered cobalt perovskite electrodes becomes a serious issue, especially due to their use as anode in alkaline fuel cells.

Chronoamperometry

Methanol fuel

10.4028/www.scientific.net/aef.27.63

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Corrosion Resistance of AISI 442 and AISI 446 Ferritic Stainless Steels as a Support for PEMWE Bipolar Plates

Materials (2023)

Mircea Laurențiu Dan Andrea Kellenberger Delia Andrada Duca Nicolae Vaszilcsin Corneliu Marius Crăciunescu

Cost reduction in bipolar plates in proton exchange membrane water electrolyzers has previously been attempted by substituting bulk titanium with austenitic stainless steels protected with highly conductive and corrosion-resistant coatings. However, austenitic steels are more expensive than ferritic steels due to their high nickel content. Herein we report on the corrosion resistance of two high chromium ferritic stainless steels, AISI 442 and AISI 446, as an alternative material to manufacture bipolar plates. Electrochemical corrosion tests have shown that AISI 442 and AISI 446 have similar corrosion resistance, while AISI 446 reveals more noble corrosion potential and performs better during potentiostatic stress tests. The current density obtained during polarization at 2 V versus the standard hydrogen electrode (SHE) is 3.3 mA cm−2, which is more than two times lower than on AISI 442. Additionally, surface morphology characterization demonstrates that in contrast to AISI 442, AISI 446 is not sensitive to intercrystalline or pitting corrosion. Moreover, EDX energy dispersion analysis of AISI 446 reveals no differences in the chemical composition of the surface layer compared to the base material, as a confirmation of its high corrosion resistance. The results of this work open up the perspective of replacing austenitic stainless steels with less expensive ferritic stainless steels for the production of components such as bipolar plates in proton exchange membrane water electrolyzers.

Austenitic stainless steel

Crevice corrosion

10.3390/ma16041501

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Citations (11)

Non-enzymatic electrochemical detection of glycerol on boron-doped diamond electrode

The Analyst (2011)

Aniela Pop Florica Manea Ciprian Radovan Dana Dascalu Nicolae Vaszilcsin

A non-enzymatic direct electrochemical glycerol detection method at a commercial boron-doped diamond (BDD) electrode in 0.1 M NaOH supporting electrolyte was developed. All the used electrochemical techniques proved useful features for the oxidation and direct amperometric determination of glycerol at a BDD electrode in 0.1 M NaOH aqueous solution. It was found that the direct electrooxidation of glycerol on the BDD electrode requires both adsorbed glycerol and hydroxyls at the electrode surface. Also, the sp(2) carbon did not allow enhancement of the glycerol oxidation process. The electronalytical sensitivity for the determination of glycerol at the BDD electrode ranged from 0.040 to 0.226 μA mM(-1) as a function of the technique used. The highest electroanalytical sensitivity for the determination of glycerol at the BDD electrode was reached in batch system amperometric quantification under stirring conditions. Performed recovery studies indicated that it is possible to determine glycerol in real samples, and the proposed batch system analysis-based methodology can be a valuable tool for practical glycerol analysis.

Amperometry

Glycerol kinase

Supporting electrolyte

10.1039/c2an15645h

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Citations (22)

Issues regarding bipolar plate-gas diffusion layer interfacial contact resistance determination

Journal of Power Sources (2022)

Sigrid Lædre Corneliu Marius Crăciunescu Thulile Khoza Nicolae Vaszilcsin Andrea Kellenberger

The interfacial contact resistance (ICRBPP-GDL) between the bipolar plates (BPPs) and gas diffusion layers (GDLs) plays a major role in proton exchange membrane-fuel cells (PEMFCs) efficiency. Accordingly, materials selection based on ex-situ ICRBPP-GDL determination is a useful tool, provided accurate through-plane resistance measurements are ensured; in this sense, an experimental study was conducted. To this end, two square-shaped samples of equal areas, one from stainless steel (a low cost BPP material), and one from carbon paper (a widely used GDL material) were placed (both separately, and stacked) between two planar Cu electrodes, and the through-plane resistance of the as-formed measuring cell was determined at various applied clamping pressures (p). It was found that although falling into the same order of magnitude (tens of mΩ cm2), the results extracted from these measurements as ICRBPP-GDL (p) are affected by the non-uniformity of the current flow through the measuring cell, and also by the position of the voltage pick-up contacts. It was concluded that if reasonably uniform path is ensured for the biasing current by splitting this into four equal currents, and if central points are used for voltage pick-up, realistic results are expected.

Contact resistance

Gaseous diffusion

Current collector

Biasing

10.1016/j.jpowsour.2022.231275

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Citations (7)