A cyclic voltammetric study of the influence of supporting electrolytes on the redox behaviour of Cu(II) in aqueous medium

Shaikh, Arif V.; Badrunnessa, M; Firdaws, Jannatul; Rahman, Shahidur; Pasha, Nishat A.; Bakshi, Pradip K.

doi:10.3329/jbcs.v24i2.9704

Cited by 17 publications

(15 citation statements)

References 4 publications

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“…The presence of a small amount of the weak acid H 3 BO 3 stabilizes the reduction of Cu(II) to the Cu(I) state, and Cu(II)/Cu(I) redox couple peaks are clearly visible in Figure S5. 23 The electrode modified with both DPM-Cu(II) and DPM-Cu(II)-DPM-AR showed quasireversible behavior. The electrochemical parameters (peak positions and peak current values) obtained for this study are summarized in Table S1.…”

Section: Analytical Chemistrymentioning

confidence: 92%

Highly Sensitive Electrochemical Sensor for the Detection of Anions in Water Based on a Redox-Active Monolayer Incorporating an Anion Receptor

et al. 2017

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In the present work, gold electrodes were modified using a redox-active layer based on dipyrromethene complexes with Cu(II) or Co(II) and a dipodal anion receptor functionalized with dipyrromethene. These modified gold electrodes were then applied for the electrochemical detection of anions (Cl, SO, and Br) in a highly diluted water solution (in the picomolar range). The results showed that both systems, incorporating Cu(II) as well as Co(II) redox centers, exhibited highest sensitivity toward Cl. The selectivity sequence found for both systems was Cl > SO > Br. The high selectivity of Cl anions can be attributed to the higher binding constant of Cl with the anion receptor and the stronger electronic effect between the central metal and anion in the complex. The detection limit for the determination of Cl was found at the 1.0 pM level for both sensing systems. The electrodes based on Co(II) redox centers displayed better selectivity toward Cl anion detection than those based on Cu(II) centers which can be attributed to the stronger electronic interaction between the receptor-target anion complex and the Co(II)/Co(III) redox centers in comparison to the Cu(II)/Cu(I) system. Applicability of gold electrodes modified with DPM-Co(II)-DPM-AR for the electrochemical determination of Cl anions was demonstrated using the artificial matrix mimicking human serum.

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Section: Analytical Chemistrymentioning

confidence: 92%

Highly Sensitive Electrochemical Sensor for the Detection of Anions in Water Based on a Redox-Active Monolayer Incorporating an Anion Receptor

et al. 2017

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“…Figure 8 illustrates the effect of variation of supporting electrolyte on the electrochemical behavior of copper complexation with guanine. Any species that compete with metal ion for the surface of the electrode would inevitably interfere in the adsorption of metal thyminate complex species hence leading to a decrease in the increase in current effect [24]. This explains why the supporting electrolyte such as (NH 4 ) 2 SO 4 , which is weakly complexing, produce higher current as compared to NaCl and KCl.…”

Section: Variation Of Supportingmentioning

confidence: 99%

A CV Study of Copper Complexation with Guanine Using Glassy Carbon Electrode in Aqueous Medium

Rana

Rahman

Alam

2014

ISRN Electrochemistry

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Voltammetric behaviors of Copper (II) nitrogen bearing nucleobases, such as Guanine (C5H4N5O2) was studied in electro analyzer using cyclic voltammetry (CV) on a Glassy Carbon Electrode. Assessment of the chemical and physical conditions that may favor optimum current enhancement was done by studying the effect of variation of concentration of metal and ligand ions, variation of scan rate, variation of step height, variation of pH values, and variation of supporting electrolyte as (NH4)2SO4, KCl, and NaCl. It was observed that Copper and Guanine forms a 1 : 2 ratio complex. The work reflects that increasing the concentration of either metal ion or ligand ion increases the corresponding current. Increasing the scan rate increases the corresponding current linearly with the square root of the scan rate. As the step height decreases the peaks become sharp. Anodic and cathodic current increases linearly with decreasing step height. For the complex mixture the complexation occurs maximum at a pH of 2.3–7.0 and is badly restricted in the slightly alkaline medium and the complexing order of the supporting electrolyte showed a trend as (NH4)2SO4>NaCl>KCl.

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“…Reaction 5 needs particular attention since it is the step leading to actual metal deposition, and has been reported to occur via copper (I) ion adsorption prior to its reduction. 19 Certain aspects of copper reduction kinetics remain highly contested, especially when comparing electrolytes of various pH, 14 partially due to difficulty in discerning the second electron transfer (reaction 5). The ability to make such comparisons is essential in order to identify the role of additives, e.g.…”

mentioning

confidence: 99%

Copper Electrodeposition Kinetics Measured by Alternating Current Voltammetry and the Role of Ferrous Species

Wagner

Valenzuela

Vargas

et al. 2015

J. Electrochem. Soc.

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Artículo de publicación ISIImpurities and additives play a key role in copper electrodeposition, in particular in upstream processes such as electrowinning or electrorefining. One common impurity is iron, mostly present as iron species Fe(II) in highly concentrated sulfuric acid solutions and in a cathodic environment. Herein, the kinetics of copper electrodeposition from such solutions have been investigated using a copper rotating disk electrode and alternating current voltammetry (ACV). For a concentration of proton of 1.84 M and a concentration of Fe(II) ions of 0.054 M, the deposition kinetics are slow enough to separately observe the two electron transfer steps involved in copper reduction: an observation unique to ACV. The results suggest that Fe(II) ions affect the electrodeposition kinetic by slowing down reaction kinetics, in particular slowing the second electron transfer reaction.MISTI-Chile progra

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A cyclic voltammetric study of the influence of supporting electrolytes on the redox behaviour of Cu(II) in aqueous medium

Cited by 17 publications

References 4 publications

Highly Sensitive Electrochemical Sensor for the Detection of Anions in Water Based on a Redox-Active Monolayer Incorporating an Anion Receptor

Highly Sensitive Electrochemical Sensor for the Detection of Anions in Water Based on a Redox-Active Monolayer Incorporating an Anion Receptor

A CV Study of Copper Complexation with Guanine Using Glassy Carbon Electrode in Aqueous Medium

Copper Electrodeposition Kinetics Measured by Alternating Current Voltammetry and the Role of Ferrous Species

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