Cathodic Potential Oscillations of Sn(II) Reduction and Hydrogen Evolution in Acid Stannous Sulfate Solutions

2006 ◽  
Vol 153 (3) ◽  
pp. E45 ◽  
Author(s):  
Shixue Wen ◽  
Jerzy A. Szpunar
Keyword(s):  
Hydrogen Evolution ◽  
Cathodic Potential ◽  
Potential Oscillations ◽  
Sulfate Solutions

scholarly journals On the kinetics of the hydrogen evolution reaction on zinc in sulfate solutions

2001 ◽  
Vol 66 (11-12) ◽  
pp. 811-823 ◽  
Author(s):  
T. Trisovic ◽  
Lj. Gajic-Krstajic ◽  
N. Krstajic ◽  
M. Vojnovic
Keyword(s):  
Reaction Mechanism ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Active Sites ◽  
Electrochemical Impedance ◽  
Active Role ◽  
Potential Region ◽  
Sulfate Solutions ◽  
Ph Range ◽  
Kinetics Of

The kinetics and mechanism of the hydrogen evolution reaction (her) were studied on zinc in 1.0 mol dm-3 Na2SO4 at 298 K, in the pH range 4.4 - 10. It was found that a combination of classical potentiostatic steady-state voltammetry (PSV) and electrochemical impedance spectroscopy (EIS) can help to elucidate dilemmas concerning the mechanism of this reaction. Thus, over the whole potential region, the reaction path of the her on zinc cannot be presented by the classical Volmer-Tafel-Heyrovsky route. It was found that the very complex S-shape of the polarization curves could be explained by two parallel reaction mechanisms for the her. The first reaction mechanism is a consecutive combination of three steps, in which the surface zinc oxide plays an active role in the her, and second reaction mechanism is a consecutive combination of a Volmer step, followed by a Heyrovsky step. The second mechanism is dominant in the more negative potential region where the active sites for the her are metallic zinc.

scholarly journals ELECTROCHEMICAL BEHAVIOR OF POLYCRYSTALLINE COPPER DURING THE ADSORPTION OF CO ABSTRACT

2017 ◽  
Vol 20 (1) ◽  
pp. 19-26
Author(s):  
J. Salimon ◽  
M. Kalaji
Keyword(s):  
Electrochemical Properties ◽  
Hydrogen Evolution ◽  
Adsorption Process ◽  
Supporting Electrolyte ◽  
Copper Surface ◽  
Polycrystalline Copper ◽  
Cathodic Potential ◽  
Subsequent Formation ◽  
Adsorption Of Co ◽  
Supporting Electrolyte Solution

The electrochemical properties of electrode copper in carbon monoxide-saturated phosphate buffered solution were investigated. The electrochemistry of copper surface was sufficiently changed after the supporting electrolyte solution was saturated with CO. The hydrogen evolution region was depressed and shifted cathodically due to the adsorption process of CO on the copper surface in a linear or terminally bonded manner, Cu-CO . The oxidation and the reduction peaks of copper were significantly changed with two couple of redox peaks. This is due to the subsequent formation and the corresponding reduction of copper(I) and the copper carbon monoxides species. Further changed in electrochemical properties occurred when the electrode surface was polarized at high cathodic potential (-1.4 V) for a period of time (15 min). The hydrogen evolution region was further depressed due to the adsorption of CO process in multiple bonding sites as adsorbed bridge bonded CO, Cu-CO B L that occurred predominantly.

A limited anodic and cathodic potential window of MoS2: limitations in electrochemical applications

Nanoscale ◽  
2015 ◽  
Vol 7 (7) ◽  
pp. 3126-3129 ◽  
Author(s):  
Muhammad Zafir Mohamad Nasir ◽  
Zdenek Sofer ◽  
Adriano Ambrosi ◽  
Martin Pumera
Keyword(s):  
Hydrogen Evolution ◽  
Cathodic Potential ◽  
Electrochemical Applications ◽  
Catalytic Hydrogen ◽  
Catalytic Hydrogen Evolution

MoS2 exhibits the limited potential windows in the anodic and cathodic regions due to the inherent electrochemistry and catalytic hydrogen evolution.

scholarly journals Sub-millivolt amplitude potential oscillations observed in the noise of hydrogen evolution on Ag and Cu microelectrodes

2007 ◽  
Vol 5 (2) ◽  
pp. 466-478
Author(s):  
Ildikó Szenes ◽  
Gábor Mészáros ◽  
Béla Lengyel
Keyword(s):  
Simultaneous Determination ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Oscillatory Behavior ◽  
Voltage Noise ◽  
Single Experiment ◽  
Potential Oscillations ◽  
Kinetics Of

AbstractA strange effect was observed while using the method of quasi-simultaneous determination of electrochemical voltage noise and impedance to obtain information on the kinetics of the hydrogen evolution reaction on Ag and Cu microelectrodes. Beyond a certain polarizing current density we found microvolt-amplitude potential oscillations on both electrodes with a frequency in the 5 Hz–5 kHz range. The oscillations were observed in every single experiment with Ag and Cu, while no oscillatory behavior was observed during the control experiments with the Pt microelectrode. The presence of the oscillations indicates that the mechanism of hydrogen evolution is more complex compared to the original assumption.

A highly stable CoMo2S4/Ni3S2 heterojunction electrocatalyst for efficient hydrogen evolution

2021 ◽  
Author(s):  
Minmin Wang ◽  
Mengke Zhang ◽  
Wenwu Song ◽  
Weiting Zhong ◽  
Xunyue Wang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Current Density ◽  
A Current

A CoMo2S4/Ni3S2 heterojunction is prepared with an overpotential of only 51 mV to drive a current density of 10 mA cm−2 in 1 M KOH solution and ∼100% of the potential remains in the ∼50 h chronopotentiometric curve at 10 mA cm−2.

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