M. Jafarian's research while affiliated with Khaje Nasir Toosi University of Technology and other places
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Publications (96)
Due to the importance of sulfide removal from wastewater and waste streams, in this study, eight cost-effective electrocatalysts were designed and prepared by electrochemical technique and their performance was evaluated in the presence of a high concentration of sodium sulfide. According to the results, among the prepared electrocatalysts, CuNiDH-...
Hydroxides of transition metals are interesting electrode materials for energy storage due to their unique properties as well as creating a synergistic effect. In this project, seven electrodes with hydroxides of transition metals were made. Among them, CoNiFeTH@G electrode (graphite electrode modified with hydroxides of cobalt, nickel, and iron) h...
Since photocatalysts play a vital role in solar cell performance, and solar cells are also an effective source of green energy. In this paper,a facile and affordable protocol for designing an effective photoanode based on the quantum dot was introduced. multi-layered quantum dots containing CdS and different layers of n-type of PbS (2, 4, 6cycles)h...
Due to the importance of producing clean energy through systems such as alcoholic fuel cell, methanol, ethanol, 1-propanol, and 2-propanol, these alcohols were oxidized at the modified graphite electrode by NiTPPBr 6 / NiTPPBr 8 as a clean electrocatalyst in an alkaline media. This process investigated by various techniques such as cyclic voltammet...
Since derived products from the oxidation of sulfides are vital for pharmaceutical companies, in this paper, electro-oxidation of aryl and alkyl sulfides was investigated on the glassy carbon electrode (GC) by electrochemical techniques such as cyclic voltammetry (CV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS). To cho...
Electro-oxidation of methyl phenyl sulfide with the aim of producing sulfoxide and sulfone was
investigated over Ni, Co, Fe, and their alloys on graphite electrodes in the acetic acid as a non-toxic solvent.
The modified electrodes were prepared by cyclic voltammetry technique. The surface morphology of electrodes
was investigated by scanning elect...
![Fig. 3 The TGA/DTGA thermogram of Fe 3 O 4 @SiO 2 -[MnL(OAc)].](profile/Parinaz-Nafarieh/publication/341050978/figure/fig3/AS:887022491299840@1588494050039/The-TGA-DTGA-thermogram-of-Fe-3-O-4-SiO-2-MnLOAc_Q320.jpg)
![Fig. 5 TEM image of Fe 3 O 4 @SiO 2 -[MnL(OAc)].](profile/Parinaz-Nafarieh/publication/341050978/figure/fig5/AS:887022491291648@1588494050282/TEM-image-of-Fe-3-O-4-SiO-2-MnLOAc_Q320.jpg)
In this study, a novel Mn(III)–Schiff base complex was synthesized and characterized. The structure of this complex was determined to be a deformed octahedral coordination sphere by single-crystal X-ray diffraction analysis. The Mn(III)–Schiff base complex was supported on silica-coated iron magnetic nanoparticles via axial coordination by one-step...
Ni particles with a so simple procedure were deposited on the graphite rod, and the performance of the proposed electrode was investigated for electrocatalytic oxidation of methyl phenyl sulfide in acidic media. It was found that performance of the Ni-modified electrode for oxidation of sulfide is successful. Voltammetric and amperometric studies s...
![Diazo coupling library. Color and λmax\documentclass[12pt]{minimal}...](publication/322254220/figure/fig3/AS:961898757488655@1606345943142/Diazo-coupling-library-Color-and-lmaxdocumentclass12ptminimal-usepackageamsmath_Q320.jpg)
The aim of this work is to introduce, model, and optimize a new non-acid-catalyzed system for a direct N\(=\)N–C bond formation. By reacting naphthols or phenol with anilines in the presence of the sodium nitrite as nitrosonium (\(\hbox {NO}^{+})\) source and triethylammonium acetate (TEAA), a N\(=\)N–C group can be formed in non-acid media. Modeli...
Copper(II) complex of a Schiff base ligand (H2L) was synthesized, characterizedand encapsulated in the cavities of zeolite-Y by a fixed ligand method. The zeolite encapsulated metal complex(CuL-Y)was characterized using FT-IR, UV-Vis and atomic absorption spectroscopy,thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), scanning electr...
Copper(II) Schiff base complex has been immobilized onto reduced graphene oxide (RGO) via covalent bonding. The nanocomposite was characterized using powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and UV–visible spectroscopies, transmission electron microscopy (TEM), scanning electron microscopy (SEM), thermo-gravimetric analysi...
Tetradentate Schiff base (H2L) derived from 2,2′-dimethylpropandiamine and its nickel(II) and oxo-vanadium(IV) complexes (NiL, VOL) have been prepared and characterized. The crystal structure of NiL has been determined. The reported structure contains two molecules of the complex revealing slightly different conformation and the coordination sphere...
The present study has considered the application of the noise analysis and fractal geometry as a promising dynamic method for exploiting the corrosion mechanism of the stainless steel 304 that is immersed in different concentrations of FeCl3. The fractal dimension calculated from the electrochemical noise technique has a good correlation with the s...
Pluronic P123, a type of Poloxamers materials, was examined as an inhibitor for decreasing zinc corrosion in alkaline media (4.0 M NaOH). This material was used in the form of the particles dispersed in electrolyte (suspension form). Its effect was examined by electrochemical methods potentiodynamic polarization (Tafel) and electrochemical impedanc...
The electrocatalytic oxidation of hydrazine was studied over Ni, Cu, Co and Ni-based ternary alloy on graphite electrodes in alkaline solution. The catalysts were prepared by cycling the graphite electrode in solutions containing Ni, Cu and Co ions at cathodic potentials. The synergistic effects and the catalytic activity of the modified electrodes...
In this study we investigated the electrocatalytic oxidation of saccharose on conductive polymer- Nickel oxide modified graphite electrodes based on the ability of anionic surfactants to form micelles in aqueous media. This NiO modified electrode showed higher electrocatalytic activity than Ni rode electrode in electrocatalytic oxidation of sacchar...
A series of β-chlorinated Meso-tetraphenylporphyrins, H2TPPClx (x = 2, 4, 6, or 8) have been prepared and the catalytic activity of their manganese(III) complexes in oxidation of cyclooctene, cyclohexene, and methyl phenyl sulfide with tetra-n-butylammonium periodate was studied. The catalytic activity of the manganese porphyrins in oxidation of cy...
Cadmium sulfide (CdS) thin film was electrodeposited on indium tin oxide (ITO) under chronoamperometry technique. The SEM images showed that the hexagonal sheets of CdS deposited on the ITO surface. The X-ray diffraction (XRD) analysis confirmed this structure for CdS crystals and the average of crystalline size and the lattice constant parametersa...
Discharge characteristics of nanorods (NRs), microsized and nanosized copper (II) oxide (CuO) particles prepared via thermal decomposition and thermal oxidation routes are examined as cathode materials of a Zn/CuO cell without membrane separators. The electrochemical discharge is examined galvanostatically at a current density of 500 mAg−1 and reve...
The role of the work function and Fermi level is
significant in the performance of the photo-electrochemical
cells. We report that a correlation exists between work function and thickness of deposited thin film metals (e.g., Zn, Pb,
Co, and Cu). The potential difference between a metal and a
reference electrode is used as a rough approach for i...
Electrochemical deposition and characterization of PbS nanocrystals on Pb electrodes in alkaline solution contain of thiourea are carried out by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) methods respectively. The diffusion coefficient of electro-active species (Pb+2) in the synthetic potential −0.36 V/SCE is investiga...
In the present study, entropy as a measure of uncertainty and signal complexity has been used in the interpretation of the wavelet results of the electrochemical noise. After the decomposition of the electrochemical noise into 8 crystals, the entropy of each crystal has been obtained using a kernel density estimator and the Shannon equation. The en...
PbS on Pb thin film (Pb/PbS) was deposited on conductive glass (CG) substrate (CG/Pb/PbS) using electrochemical techniques to investigate the Schottky junction in solution. The CG/Pb/PbS electrode was investigated by different techniques based on thermionic emission theory. Electrochemical cell consisted of the CG/Pb/PbS as a working electrode in a...
Entropy as a measure of uncertainty was used to represent the results of the wavelet technique in electrochemical noise analysis. The experimental signals were obtained by recording the electrochemical potential and current noise of 7075 aluminum alloy in 3.5% NaCl solution. The electrochemical potential and current noise were decomposed into 16 le...
Purpose
– The purpose of this paper was to investigate the anti-corrosion behavior of polypyrrole (PPy) films in different states and presence of alumina nanoparticles synthesized by galvanostatic electropolymerization on stainless steel (SS) electrodes in an artificial seawater solution using potentiodynamic polarization and electrochemical impeda...
The corrosion behavior of different grades of commercial aluminum such as AA1040, AA5083, AA6060 and AA7075 in ZnO-containing 4 M NaOH has been determined by using open circuit potential-time measurements (OCP), galvanostatic and potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results of scanning electron microsco...
Ship-in-a-bottle complex of nickel(II) containing the ligand N,N'-bis(2,4-dihydroxyacetophenone)-2,2-dimethylpropandiimine (H2{salnptn(4-OH)2}) has been synthesized in zeolite Y. The characteristics of the encapsulated complex are identified by the methods of EDX, SEM, XRD, FT-IR and cyclic voltammetry. A catalytic effect in the electrochemical oxi...
Utilising molecular dynamics simulations, the hydrogen molecules adsorption isotherms of the (8, 0) palladium decorated single-walled carbon nanotube (SWNT) were obtained. The hydrogen adsorption was studied on the external, interstial and internal surfaces of the SWNT bundle at several temperatures ranging from 77 to 400 K. The results were compar...
Nickel‐modified glassy carbon electrode (GC/Ni) prepared by galvanostatic deposition was used for the electrocatalytic oxidation of glucose in alkaline solutions where different electrochemical methods were employed. In cyclic voltammetry studies, in the presence of glucose an increase in the peak current of the oxidation of nickel hydroxide is fol...
The electro-reduction of oxygen on silver-modified glassy carbon electrode (Ag/GC) in acidic solution at different potentials was studied by ac-impedance spectroscopy. The influence of the electrode potential on impedance of oxygen reduction reaction is studied and a mathematical model was put forward to quantitative account for the impedance behav...
Electrodes made of group VIII and IB metals were examined for their redox process and electrocatalytic activities towards the oxidation of ethylene glycol in alkaline solutions. The method of cyclic voltammetery (CV) and Open circuit potentials measurement (OCP) was employed. It is found that considerable electrooxidation current are observed for s...
Nickel modified graphite electrodes (G/Ni) prepared by galvanostatic deposition were examined for their redox process and electrocatalytic activities towards the oxidation of methanol, ethanol, 1-propanol and 2-propanol in alkaline solutions. The methods of cyclic voltammetry (CV), chronoamperometry (CA) and impedance spectroscopy (EIS) were employ...
NiII-(N,N′-bis(2,4-dihydroxyacetophenone)-2,2-dimethylpropandiimine (NiII{salnptn(4-OH)2}) complex has been encapsulated within the supercage of zeolite-NaY by reacting Ni2+-exchanged NaY with the flexible Schiff-base ligand that diffuses into the cavities. The encapsulated complex is characterized by EDX, scanning electron microscopy, powder X-ray...
Nickel oxide (NiOx) and polypyrrole (PPy) were electrodeposited from NiSO4 and pyrrole through cyclic voltammetry scans to afford PPy–NiOx composite film at controlled pH environment. Surface morphology of the composite was studied by surface microscopy techniques (SEM). The presence of Nickel in the composite films was confirmed by XRD analysis. M...
Nickel modified NiOOH electrodes were used for the electrocatalytic oxidation of ethanol in alkaline solutions where the methods of cyclic voltammetry (CV) and chronoamperometry (CA) were employed. In CV studies, in the presence of ethanol, an increase in the current for the oxidation of nickel hydroxide is followed by a decrease in the correspondi...
The oxidation of olefins and organic sulfides with tetra-n-butylammonium periodate (TBAP) in the presence of a Mn(III) complex from a series of partially and fully brominated meso-tetraphenylporphyrins, MnTPPBrx(OAc) (x = 0, 2, 4, 6 and 8) has been studied in a comparative manner. With the exception of MnTPPBr2(OAc), the half-wave potential for the...
The fractal dimensions of polypyrrole (PPy) film electrodeposited on the glassy carbon (GC) electrode
formed in the presence of ClO�4 is obtained by cyclic voltammetry (CV) and electrochemical impedance
spectroscopy (EIS) methods in different film thicknesses and various synthesis temperatures. Atomic
force microscopy (AFM) technique was employed t...
This paper aims to investigate the relationship between surface morphology of poly ortho aminophenol (POAP) films and synthesis conditions. POAP with different particle sizes was deposited on a glassy carbon (GC) electrode using direct current (DC) and pulse techniques. POAP nanoparticles with good electrochemical stability and high doping degree w...
Electrochemical impedance spectroscopy (EIS) was employed to investigate diffusion of AlCl4- ions in basic (AlCl 3-NaCl-KCl) molten salt. Nyquist plots in different DC offset potentials showed finite and restricted aluminum ion diffusion due to insertion and blocking in the graphite electrode. The general Warburg, open Warburg, and short Warburg im...
Semiconducting lead sulfide film was deposited on Stainless Steel (SS) electrode by cyclic voltammetry (CV) at room temperature. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry were used to investigate the electrochemical properties of PbS film in Na2SO4 solution. The voltammetric results showed that oxidative dissolution of PbS...
Purpose
– This paper aims to investigate the galvanic corrosion of titanium/L 316 stainless steel, by electrochemical noise (EN), electrochemical impedance spectroscopy (EIS), and anode/cathode area ratio effect on the galvanic behavior of the couple.
Design/methodology/approach
– The EN measurement was employed to examine effects of anode to cath...
Complexes of NiII–(N,N′-bis(2-hydroxy, 3-methoxy benzaldehyde)-1,2-propandiimine) can be electro-polymerized onto GC electrode in an alkaline solution to give an electro-active film strongly adhered on the electrode surface. In alkaline solution, this poly-(NiII{sal-1,2-pn(3-OMe)2})/GC film shows the typical voltammetric response of a surface-immob...
Composites of multi-walled carbon nanotubes (MWCNTs) and poly ortho aminophenol (POAP) with good uniformity for use as electrodes in electrochemical capacitors were prepared by electropolymerization by using the ionic surfactant as electrolyte, for dispersing CNTs within conducting polymer/carbon nanotube composite films. The capacitance properties...
Nickel-copper alloy modified glassy carbon electrodes (GC/NiCu) prepared by galvanostatic deposition were examined for their redox process and electrocatalytic activities towards the oxidation of methanol and glucose in alkaline solutions. The methods of cyclic voltammetery (CV), chronoamperometry (CA) and impedance spectroscopy (EIS) were employed...
Electro-oxidation of alcohols (methanol, ethanol, 1-propanol and 2-propanol) on nickel dispersed into a thick layer of poly-o-aminophenol on graphite electrode (GE/POAP–SDS/Ni) was investigated. Ni-doping into the polymeric film was achieved chemically followed by enrichment of Ni(III) through cycling the potential. The electro-oxidation of alcohol...
Electrochemical deposition of Al, Pb, Mn, Al-Pb and Al-Mn alloys from basic and acidic molten AlCl3-NaCl-KCl mixture on graphite and aluminum electrodes have been extensively studied by electrochemical methods. The deposition of aluminum was found to proceed via a nucleation/growth mechanism in basic melt, while it was found to be diffusion control...
A stable copper (hydr)oxide-modified electrode was prepared in 0.5 mol/L NaOH solution by cyclic voltammetry in the range of −250 to 1000 mV. It can be used for electrochemical studies in the range of −250 to 1 000 mV without interfering peaks because there is no oxidation of copper. During an anodic potential sweep, the electro-oxidation of saccha...
We describe in detail the advantages of a novel method of electrochemical preparation of poly ortho aminophenol (POAP), based on the ability of anionic surfactants to form micelles in aqueous media. We demonstrate that the electropolymerisation process carried out in the presence of Sodium Dodecyl Sulfate (SDS) at an oxidation potential lower than...
The coexistence of multiple attractors in the Koper–Gaspard model of the electrochemical oscillatory reactions on the rotating-disk electrode (RDE) has already been investigated. It is held that the Koper–Gaspard model dynamics has many multiple attractors between simple harmonic oscillations or chaos and mixed-mode oscillations in many ranges of t...
The fractal dimension of poly ortho aminophenol (POAP) films in the presence of different counter ions was investigated. The POAP films were deposited on graphite electrode by cyclic voltammetry. The deposited films were also characterized by electrochemical impedance spectroscopy (EIS) in wide frequency range. The length scale, the distances betwe...
Oxygen reduction on a polycrystalline silver electrode was studied by cyclic voltammetry and electrochemical impedance spectroscopy. The reaction occurred by a two-electron pathway. The steps in the mechanism were observed in the cyclic voltammograms recorded with different scan rates. The intermediates formed in the steps were detected by electroc...
Nickel and nickel–manganese alloy modified graphite electrodes (G/Ni and G/NiMn) prepared by galvanostatic deposition were examined for their redox process and electrocatalytic activities towards the oxidation of methanol in alkaline solutions. The methods of cyclic voltammetery (CV), chronoamperometry (CA) and impedance spectroscopy (EIS) were emp...
Electrochemical deposition of aluminum and manganese from basic and acidic molten AlCl3–NaCl–KCl mixture on an aluminum electrode at 180°C was studied by the methods of voltammetry, and potential and current
transient. The deposition of aluminum was found to proceed via a nucleation/growth mechanism in basic melt, while the deposition
of manganese...
Hydrogen adsorption isotherms for (8, 0) platinum-decorated single-walled carbon nanotube were studied using molecular dynamics simulation. Adsorption isotherms were obtained for both internal and external surfaces of nanotube at several temperatures from 77 K up to 400 K. The results were compared with the bare nanotube at the same conditions. Ads...
Electrochemical deposition of aluminum and lead from basic molten AlCl3–NaCl–KCl mixture on an aluminum electrode at 180°C was studied by the methods of voltammetry, potential and current transient and constant current deposition. The deposition of aluminum was found to proceed via a nucleation/growth mechanism, while the deposition of lead was fou...
Hydrogen self diffusity in internal surface of (8, 0) platinum/palladium decorated single-walled carbon nanotubes was studied at various pressures and different temperatures from 77 up to 298 K using molecular dynamics simulations. The results were compared with the bare nanotube at the same conditions. The self diffusity in the bare nanotube is fo...
The relationship between the fractal dimension of poly-ortho-aminophenol film and its thickness in the presence of different anions was studied using the peak current scaling in cyclic voltammetry (CV). There is a meaningful relation between the inner and outer cutoff (minimum and maximum length scale of the surface seen by the diffusing species, r...
The electro-oxidation of methanol on nickel and nickel–copper alloy modified glassy carbon electrodes (GC/Ni and GC/NiCu) in a 1 M NaOH solution at different concentrations of methanol was studied by the method of ac-impedance spectroscopy. Two semicircles in the first quadrant of a Nyquist diagram were observed for electro-oxidation of methanol on...
Nickel-copper alloy modified glassy carbon electrodes (GC/NiCu) prepared by galvanostatic deposition were used for the electrocatalytic oxidation of glucose in alkaline solutions. The electro-oxidation of glucose in a 1 M NaOH solution at different concentration of glucose was studied by the method of ac-impedance spectroscopy. The impedance behavi...
The Feed-Forward Artificial Neural Networks (FFANNs) were used to predict the corrosion behavior of lead. A 3-9-2 network was adopted to train the networks and predict the lead corrosion behavior. The descriptors (input) were obtained using experimental methods. Solution concentration, pH and passive time were selected as the ANN input to predict t...
Electrocatalytic oxidation of cyclohexanol was investigated on copper electrode in alkaline solution. The process of oxidation involved and its kinetics were established by using cyclic voltammetry, chronoamperometry techniques as well as steady state polarization measurements. It has been found that in the course of an anodic potential sweep the e...
The electro-oxidation of glucose on nickel-modified glassy carbon electrode (GC/Ni) in a 1 M NaOH solution at different concentration of glucose was studied by the method of ac-impedance spectroscopy. In low concentration of glucose (<7 mM) two semicircles in the first quadrant of a Nyquist diagram were observed corresponding to charge transfer res...
Nickel and nickel–copper alloy modified glassy carbon electrodes (GC/Ni and GC/NiCu) prepared by galvanostatic deposition were examined for their redox process and electrocatalytic activities towards the oxidation of methanol in alkaline solutions. The methods of cyclic voltammetery (CV) and chronoamperometry (CA) were employed. The cyclic voltammo...
Nickel and nickel-copper alloy modified glassy carbon electrodes (GC/Ni and GC/NiCu) prepared by galvanostatic deposition were examined for their redox processes and electro-catalytic activities towards the oxidation of glucose in alkaline solutions. The methods of cyclic voltammetry (CV) and chronoamperometry (CA) were employed. The cyclic voltamm...
Purpose
– The purpose of this paper is to investigate the effects of inorganic inhibitors on the corrosion rate of aluminum alloy using the electrochemical noise (EN) analysis and electrochemical impedance spectroscopy (EIS) techniques.
Design/methodology/approach
– EN and EIS measurements were employed to study the corrosion behavior of aluminum...
The electrochemical behavior of a tin electrode in citric acid solutions of different concentrations was studied by electrochemical techniques. The E/I curves showed that the anodic behavior of tin exhibits active/passive transition. Passivation is due to the formation of Sn(OH)4 and/or SnO2 film on the electrode surface. Addition of NaCl to citric...
Electrochemical noise (EN) measurement and electrochemical impedance spectroscopy (EIS) were employed to study the corrosion behaviour of carbon steel API 5L (X60). The base solution was deaerated aqueous 0.5M bicarbonate to which chloride ion (NaCl) was added in concentrations ranging from 0.05 to 0.3M; potentiodynamic polarisation measurements we...
The mechanism and kinetics of the hydrogen evolution reaction (HER) on tin electrode in 0.1M H2SO4 solution were studied using the methods of steady-state polarization and electrochemical impedance spectroscopy. The simulation of the data obtained from these two methods, using nonlinear fitting procedure allowed us to determine the rate constants o...
Electrocatalytic activity of electrodeposited nanocrystalline CoNiFe alloy in hydrogen evolution reaction (HER) was studied in 1M NaOH solution. The steady-state polarization measurement and electrochemical impedance spectroscopy were used to determine the Tafel slope, the exchange current density and the activation energy. The simulation of the da...
Aluminum electrocrystallization is studied by means of electrochemical impedance spectroscopy (EIS). A model based on random birth and deterministic growth of monolayers is proposed, in which the edges are assumed to follow a propagation law. The high frequency impedance data show charge transfer reaction of AlCl4− reduction while the low frequency...
Hydrogen evolution and electrosorption on/in TiHg alloy have been investigated in acidic solution using cyclic voltammetry, open circuit potential transient, steady-state polarization, chronopotentiometry and electrochemical impedance measurements. Comparison has been made with pure Ti. Cyclic voltammetry and open circuit potential measurements sho...
Purpose
This paper aims to estimate the corrosion rate of the carbon steel in crude oil using the electrochemical noise (EN) analysis technique.
Design/methodology/approach
EN measurements and electrochemical impedance (EIS) spectroscopy were employed to study the corrosion behaviour of carbon steel in crude oil and the optimum conditions of the n...
Electrochemical deposition of aluminum from basic and acidic molten NaCl-KCl-AlCl3 mixture on a graphite electrode at 140°C was studied by voltammetry, chronopotentiometry and constant current deposition. The deposition of aluminum was found to proceed via a nucleation/growth mechanism in basic melt, while it was found to be diffusion controlled in...
Electrochemical noise (EN) and electrochemical impedance spectroscopy (EIS) measurements were used to evaluate protective properties and corrosion behaviour of two different organic coating systems. The coatings of commercial grade (zinc rich ethyl silicate) were applied to steel substrates and immersed for up to 3 months in 0.5M NaCl at 25 degrees...
The electro-catalytic oxidation of methanol on a Ni–Cu alloy (NCA) with atomic ratio of 60/40 having previously undergone 50 potential sweep cycles in the range 0–600mV vs. (Ag/AgCl) in 1m NaOH was studied by cyclic voltammetry (CV), chronoamperometry (CA) and impedance spectroscopy (EIS). The electro-oxidation was observed as large anodic peaks bo...
Electrodeposition of aluminum onto graphite from a molten electrolyte containing AlCl3–NaCl–KCl was studied by the method of chronoamperometery. In the early stage of the deposition and at low cathodic potentials two-dimensional (2D) nucleation and growth proceeding through instantaneous and a multitude of progressive steps followed the initial dou...
Platinum microparticles electrodeposited at a glassy carbon surface (Pt/GC) and within a poly-ortho-aminophenol film formed on a GC substrate (Pt/PoAP/GC) have been used for investigating their catalytic activity towards hydrogen evolution reaction and methanol oxidation by cyclic voltammetry, impedance spectroscopy and chronoamperometry. The effec...
The electro-oxidation of methanol on copper in alkaline solutions has been studied by the methods of cyclic voltammetry, quasi-steady state polarization and chronoamperometry. It has been found that in the course of an anodic potential sweep the electro-oxidation of methanol follows the formation of CuIII and is catalysed by this species through a...
Cobalt hydroxide modified glassy carbon electrodes (CHM/GC) prepared by the anodic deposition in presence of tartrate ions have been used for the electro-catalytic oxidation of methanol in alkaline solutions where the methods of cyclic voltammetery (CV), chronoamperometry (CA) and impedance spectroscopy (IS) have been employed. In CV studies, in th...
The processes of adsorption and absorption of H atoms on silver electrode in alkaline media has been studied using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The potential range in the CV studies has been between -0.1 and -1.6 V /Ag-AgCl. In the first cycle, two cathodic and three anodic peaks have been observed. The...
Nickel hydroxide modified nickel electrodes prepared by cycling the potential of a nickel electrode in alkaline solution exhibited electrocatalytic activity for the oxidation of methane in alkaline media. In the presence of methane the oxidation peak current of nickel hydroxide increases while that of the reverse process decreases. This is attribut...