Alireza Madram - Academia.edu (original) (raw)

Alireza Madram

Associate professor of analytical chemistryResearches: Industrial electrochemistry

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Papers by Alireza Madram

Research paper thumbnail of Preparation of Ni–P–La alloy as a novel electrocatalysts for hydrogen evolution reaction

International Journal of Hydrogen Energy, 2020

Abstract Ternary Ni–P–La alloy was synthesized by the co-electrodeposition method on the copper s... more Abstract Ternary Ni–P–La alloy was synthesized by the co-electrodeposition method on the copper substrate. The energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and X-ray diffraction (XRD) were used for characterization of the synthesized alloy. The electrochemical performance of the novel alloy was investigated based on electrochemical data obtained from steady-state polarization, Tafel curves, linear sweep voltammetry (LSV), and electrochemical impedance spectroscopy (EIS) in alkaline solution and at ambient temperature. The results showed that the microstructural properties play a vital purpose in determining the electrocatalytic activity of the novel alloys. Also, the HER on investigated alloys was performed via the Volmer-Heyrovsky mechanism and Volmer step as RDS in this work. Ni–P–La catalyst was specified by ƞ250 = −139.0 mV, b = −93.0 mV dec−1, and jo = −181.0 μA cm−2. The results revealed that the Ni–P–La catalysts have a high potential for HER electrocatalysts in 1M NaOH solution.

Research paper thumbnail of A Novel Route for Electrolytic Production of Very Branchy Copper Dendrites under Extreme Conditions

Journal of The Electrochemical Society, 2021

Copper electrodeposition in a form of powder was examined using the pulsating overpotential (PO) ... more Copper electrodeposition in a form of powder was examined using the pulsating overpotential (PO) regime from the sulfate electrolyte without or with an addition of various concentrations of chloride ions. Morphological and structural characteristics of the produced particles were analyzed by the scanning electron microscope (SEM) and the X-ray diffraction (XRD) method. The final morphology of Cu powders was determined with two parallel processes: a) suppression of hydrogen evolution reaction due to pause duration considerably longer than the deposition time, and b) catalytic effect of added chlorides. Depending on the amplitude of overpotential applied, addition of chlorides into the solution led to either an appearing of dendrites or to formation of very branchy dendrites, what confirms a catalytic effect of these ions on the process of Cu electrolysis. The novel forms of copper dendrites, such as the needle-like and the 2D (two dimensional), were identified in this investigation, and the catalytic effect of chlorides on copper electrodeposition has been just discussed by morphological analysis of these dendritic forms. The XRD analysis of the copper dendrites obtained with an addition of chlorides showed predominantly oriented the Cu crystallites in (111) plane.

Research paper thumbnail of Preparation of Ni–P–La alloy as a novel electrocatalysts for hydrogen evolution reaction

International Journal of Hydrogen Energy

Research paper thumbnail of A New Facile One-Pot Method for Preparation of 1,1-bis(silyl)alkene Via Imine Precursor

ABSTRACT Aniline reacts with variety of aryl aldehydes in ethanol to afford the corresponding imi... more ABSTRACT Aniline reacts with variety of aryl aldehydes in ethanol to afford the corresponding imines. The reaction of imines with tris(dimethylsilyl)methyl lithium, (HMe2Si)3CLi, in THF at − 10°C gives 1,1-bis(silyl)-1-alkenes derivatives bearing Si-H functional and reactive groups.

Research paper thumbnail of Preparation of Ni–P–La alloy as a novel electrocatalysts for hydrogen evolution reaction

International Journal of Hydrogen Energy, 2020

Abstract Ternary Ni–P–La alloy was synthesized by the co-electrodeposition method on the copper s... more Abstract Ternary Ni–P–La alloy was synthesized by the co-electrodeposition method on the copper substrate. The energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and X-ray diffraction (XRD) were used for characterization of the synthesized alloy. The electrochemical performance of the novel alloy was investigated based on electrochemical data obtained from steady-state polarization, Tafel curves, linear sweep voltammetry (LSV), and electrochemical impedance spectroscopy (EIS) in alkaline solution and at ambient temperature. The results showed that the microstructural properties play a vital purpose in determining the electrocatalytic activity of the novel alloys. Also, the HER on investigated alloys was performed via the Volmer-Heyrovsky mechanism and Volmer step as RDS in this work. Ni–P–La catalyst was specified by ƞ250 = −139.0 mV, b = −93.0 mV dec−1, and jo = −181.0 μA cm−2. The results revealed that the Ni–P–La catalysts have a high potential for HER electrocatalysts in 1M NaOH solution.

Research paper thumbnail of A Novel Route for Electrolytic Production of Very Branchy Copper Dendrites under Extreme Conditions

Journal of The Electrochemical Society, 2021

Copper electrodeposition in a form of powder was examined using the pulsating overpotential (PO) ... more Copper electrodeposition in a form of powder was examined using the pulsating overpotential (PO) regime from the sulfate electrolyte without or with an addition of various concentrations of chloride ions. Morphological and structural characteristics of the produced particles were analyzed by the scanning electron microscope (SEM) and the X-ray diffraction (XRD) method. The final morphology of Cu powders was determined with two parallel processes: a) suppression of hydrogen evolution reaction due to pause duration considerably longer than the deposition time, and b) catalytic effect of added chlorides. Depending on the amplitude of overpotential applied, addition of chlorides into the solution led to either an appearing of dendrites or to formation of very branchy dendrites, what confirms a catalytic effect of these ions on the process of Cu electrolysis. The novel forms of copper dendrites, such as the needle-like and the 2D (two dimensional), were identified in this investigation, and the catalytic effect of chlorides on copper electrodeposition has been just discussed by morphological analysis of these dendritic forms. The XRD analysis of the copper dendrites obtained with an addition of chlorides showed predominantly oriented the Cu crystallites in (111) plane.

Research paper thumbnail of Preparation of Ni–P–La alloy as a novel electrocatalysts for hydrogen evolution reaction

International Journal of Hydrogen Energy

Research paper thumbnail of A New Facile One-Pot Method for Preparation of 1,1-bis(silyl)alkene Via Imine Precursor

ABSTRACT Aniline reacts with variety of aryl aldehydes in ethanol to afford the corresponding imi... more ABSTRACT Aniline reacts with variety of aryl aldehydes in ethanol to afford the corresponding imines. The reaction of imines with tris(dimethylsilyl)methyl lithium, (HMe2Si)3CLi, in THF at − 10°C gives 1,1-bis(silyl)-1-alkenes derivatives bearing Si-H functional and reactive groups.

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