Copper oxides: kinetics of formation and semiconducting properties. Part I. Polycrystalline copper and copper-gold alloys

Vvedenskii, A. V.; Grushevskaya, S. N.; Ganzha, S. V.; Eliseev, D. S.

doi:10.1007/s10008-014-2522-z

Cited by 11 publications

(7 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Three-dimensional macroscopic structure formation for Cu electrodes in alkaline me-dia is not uncommon. [66][67][68] Performing electrolysis at intermediate voltages (250 V) results in pitting of the surface. Performing electrolysis at high voltages, including the region for CGDE, the surface becomes more smooth.…”

Section: Cumentioning

confidence: 99%

Structural Evolution of Pt, Au, and Cu Anodes by Electrolysis up to Contact Glow Discharge Electrolysis in Alkaline Electrolytes

Artmann¹,

Menezes²,

Forschner³

et al. 2021

Preprint

View full text Add to dashboard Cite

<div>Applying a voltage to metal electrodes in contact with aqueous electrolytes results in the electrolysis of water at low voltages and plasma formation in the electrolyte at high voltages referred to as contact glow discharge electrolysis (CGDE). While several studies explore parameters that lead to changes in the I-U characteristics in this voltage range, little is known about the evolution of the structural properties of the electrodes. Here we study this aspect on materials essential to electrocatalysis, namely Pt, Au, and Cu. The stationary I-U characteristics are almost identical for all electrodes. Detailed structural characterization by optical microscopy, scanning electron microscopy, and electrochemical approaches reveal that Pt is stable during electrolysis and CGDE, while Au and Cu exhibit a voltage-dependent oxide formation. More importantly, oxides are reduced when the Au and Cu electrodes are kept in the electrolysis solution. We suspect that H<sub>2</sub>O<sub>2 </sub>(formed during electrolysis) is responsible for the oxide reduction. The reduced oxides (which are also accessible <i>via</i> electrochemical reduction) form a porous film, representing a possible new class of materials in energy storage and conversion studies.</div>

show abstract

Section: Cumentioning

confidence: 99%

Structural Evolution of Pt, Au, and Cu Anodes by Electrolysis up to Contact Glow Discharge Electrolysis in Alkaline Electrolytes

Artmann¹,

Menezes²,

Forschner³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The control of this parameter presents a problem. The resistivity of nanofilms produced electrochemically on the metal surface can be controlled by the potentiometric method [11,12]. We examine the CLVA method that makes it possible, using one polarization curve, to follow the process of oxide film formation on the metal surface (the anode part of the curve), as well as to assess the phase composition and resistivity by the cathode part of the curve.…”

Section: Figures 4 a And 4 B Show The Kinetic Dependences F(t) H =mentioning

confidence: 99%

“…Anode polarization of the metal surface in alkaline solutions is also used to produce oxide nanolayers characterized by certain functional properties [1]. To monitor the process of obtaining nanofilms various physical, physicochemical [2,3], and electrochemical methods [4][5][6][7][8][9][10][11][12] are used.…”

Section: Introductionmentioning

confidence: 99%

Study of oxide layers on metals and alloys by cyclic local voltammetry

et al. 2019

View full text Add to dashboard Cite

The paper deals with the possibilities of local electrochemical analysis (LEA) in the investigation of anode properties and predicting corrosion behavior of metals and galvanic alloys. Our aim is to study changes in the surface composition in the process of anodic dissolution, determine the phase composition and quality of passive films on the surface of metals and alloys and control oxide nanofilm resistivity. We show the possibility of using the hybrid LEA method that combines cyclic local voltammetry and abrasive voltammetry to investigate the kinetics of oxide layer growth, determine their thickness, phase composition and resistivity. Analysis of one polarization curve makes it possible to monitor the process of oxide film formation on the metal surface (anode part) and estimate its phase composition and resistivity (cathode part). We propose a novel way of calculating the resistivity of the oxide film and an equation that describes its growth. The results of theoretical calculations are confirmed by the experimental data obtained in the course of analyzing the polarization of tin, lead and their alloys in an aqueous alkaline solution. The dependence of the oxide film thickness on the time of film growth is exponential.

show abstract

“…Corrosion inhibitors effectively eliminate the undesirable destructive effect and prevent metal dissolution. Most acid corrosion inhibitors are nitrogen- or sulfur-containing organic compounds (Vvedenskii et al , 2014; Lee et al , 2008). 2-amino-5-mercapto-1,3,4-thiadiazole (AMT) has been proposed as a new corrosion inhibitor for the conservation of copper–tin–bronze because of the formation of insoluble complexes (Lee et al , 2008; Ahn et al , 2010).…”

Section: Introductionmentioning

confidence: 99%

Adsorption behavior of tautomeric forms of 2-aminino-5-mercato-1,3,4 – thiadizole as corrosion inhibitor on copper surface

Xiong

Sun

et al. 2016

ACMM

View full text Add to dashboard Cite

Purpose The purpose of this study is to evaluate the effect of the four tautomeric forms of 2-amino-5-mercatpo-1,3,4-thiadizole (AMT) absorbed on copper surface by the polar or non-polar groups. Polar group of AMT is mostly electronegative with larger N and S atoms as central atoms. 5-amino-1,3,4-thiadiazole-2(3H)-thion (AMT-c) has the highest adsorption energy and is easy to react with copper. The interaction between AMT-c and copper conforms to chemisorption, which is to be further verified by the experiment on the weight loss measurement. Design/methodology/approach Adsorption behavior of AMT as corrosion inhibitor on copper surface in oil field was studied by weight loss measurement, and the corrosion inhibition mechanism was analyzed. Reactive sites and distributions of tautomeric forms of AMT as inhibitor on Cu(100) crystal plane were calculated by density functional theory. Findings All atoms of AMT are in the same plane, and AMT is an aromatic ring structure by large p-chain adsorbed on the metal surface by a plane configuration. AMT-c has the highest adsorption energy and also the most stable isomerized product. The determinate locations of AMT on the Cu(100) surface are the bridge and the hollow sites using molecular dynamics. Corrosion of copper can be effectively inhibited by AMT, which is a kind of excellent corrosion inhibitor, and this property is attributed to the polar groups and non-polar groups of AMT that play a role as absorption and shielding on copper surface, respectively. Inhibition efficiency is increased with the increase in the concentration of the inhibitor. The maximum efficiency of 92 per cent is obtained for 50 ppm AMT concentration at 373 K, which is attributed to the presence of extensively delocalized electrons of the phenyl rings, planarity and the presence of lone pair of electrons on N and S atoms, which favored a greater adsorption of inhibitors on copper surface. Originality/value Corrosion of copper can be effectively inhibited by AMT, which is a kind of excellent corrosion inhibitor, and this property is attributed to the polar groups and non-polar groups of AMT that play a role as absorption and shielding on copper surface, respectively. Adsorption of AMT as corrosion inhibitor on copper surface obeys Langmuir isotherm. The interaction between AMT and copper conforms to chemisorption, which is to be further verified by the experiment on the weight loss measurement.

show abstract

Copper oxides: kinetics of formation and semiconducting properties. Part I. Polycrystalline copper and copper-gold alloys

Cited by 11 publications

References 50 publications

Structural Evolution of Pt, Au, and Cu Anodes by Electrolysis up to Contact Glow Discharge Electrolysis in Alkaline Electrolytes

Structural Evolution of Pt, Au, and Cu Anodes by Electrolysis up to Contact Glow Discharge Electrolysis in Alkaline Electrolytes

Study of oxide layers on metals and alloys by cyclic local voltammetry

Adsorption behavior of tautomeric forms of 2-aminino-5-mercato-1,3,4 – thiadizole as corrosion inhibitor on copper surface

Contact Info

Product

Resources

About