Impedance of the copper electrode in isopotential solutions containing complexes of Cu(II) and glycolic acid

Būdienė, Jurga; Survilienė, A.; Survila, Arvydas

doi:10.1134/s1023193507110134

Cited by 4 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar phenomena were discovered during the study of the Cu|Cu(II), glycolic acid system [19]. It was established that the matching could be significantly improved if the Gerischer impedance G [21] was introduced into the [R 1 W 1 ] sub-circuit.…”

Section: Resultssupporting

confidence: 55%

See 1 more Smart Citation

Impedance of copper electrode in slightly acid Cu(II)-glycine solutions

Survila¹,

Kanapeckaitė²,

Gudavičiūtė³

et al. 2020

chemija

Self Cite

View full text Add to dashboard Cite

Electrochemical impedance spectroscopy was used to study the kinetics of reduction of Cu (II) in weakly acidic (pH 4 and 5) solutions of Cu (II) containing glycine (0.04 or 0.1 M) as a complexing agent. A rather slow equilibration was observed at pH 4 and glycine concentration cL = 0.04 M. With increasing pH or cL, the total concentration of intermediate Cu(I) decreases. At the same time, impedance increases over the entire range of frequencies applied. An equivalent circuit with two parallel sub-circuits, each containing the charge transfer resistance and Warburg impedance in series, was used to quantify the impedance spectra. The exchange current densities of two consecutive one-electron transfers were estimated. Their average values are ~1 µA cm–2 and ~0.1 mA cm–2.

show abstract

Section: Resultssupporting

confidence: 55%

“…Assuming that the parameter Y 0 approximately represents the double-layer capacitance we obtain the order of С dl ~70 μF cm -2 . Relatively high values of С dl , typical of a Cu electrode, were observed both in solutions of simple salts and in the presence of ligands [15,16,19,20].…”

Section: Resultsmentioning

confidence: 99%

Impedance of copper electrode in slightly acid Cu(II)-glycine solutions

Survila¹,

Kanapeckaitė²,

Gudavičiūtė³

et al. 2020

chemija

Self Cite

View full text Add to dashboard Cite

show abstract

“…From 3.7 to 5.6 at À 1.1 V appeared the third reduction peak. These peaks were most probably proton reduction [17] from the same hydroxyl group present in the malic acid molecule. Namely, first peak was result of proton reduction from undissociated malic acid (H 2 L), second one from HL -and the third one from L…”

Section: Characterization Of Fe(iii)-malate Complexesmentioning

confidence: 95%

“…Malic acid, HOOC-CH 2 -CH(OH)-COOH, is usually symbolized as H 2 L to emphasize that its dissociation yields two hydrogen ions from carboxylate groups [17]. According to literature, pK a value of hydroxyl group have been estimated and it amounts 14.5 AE 0.1 [18].…”

Section: Characterization Of Fe(iii)-malate Complexesmentioning

confidence: 99%

Iron(III)‐Complexes Engaged in the Biochemical Processes in Seawater. II. Voltammetry of Fe(III)‐Malate Complexes in Model Aqueous Solution

2010

View full text Add to dashboard Cite

show abstract

“…In other words, the Cu electrode suffered from serious dissolution at high potentials under alkaline condition, 63 and then it was highly possible for the dissolved Cu 2+ ions to form a chelated complex with ethylene glycol and its derived molecules such as glycolate (if any) in alkaline media. 64,65 Hence, we speculated that this chelated complex may cause frequency shifting of the characteristic bands of glycolate.…”

Section: Reaction Pathways Of Egormentioning

confidence: 99%

Selective Electrocatalytic Oxidation of Ethylene Glycol into Glycolic Acid at Coin-Group Electrodes: An Investigation on Catalytic Activity and Selectivity

Ma,

He,

Zhang

et al. 2024

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Ethylene glycol (EG) is an important platform molecule that can be produced from biomass and waste plastics. The electrochemical upgrading of EG is essential to approach the goal of low-carbon sustainable development. Coin-group metals (CGMs) including Au, Ag, and Cu have recently emerged as promising alternatives to platinum-group metals on selective electrooxidation of EG (EGOR) to value-added C2 chemicals, especially glycolic acid/glycolate. Nevertheless, the corresponding electrocatalytic processes are still indistinct, which is essential to be clarified. Specifically, it shows that the Au and Cu electrodes can exhibit considerable EGOR activity, but not Ag. Product analysis results show that the Faradaic efficiency (FE) of the EG-toglycolate pathway on Au surface is over 95% at 1.0 V vs reversible hydrogen electrode (RHE). It is also around 90% on Cu surface, but Cu electrodes suffer from electrochemical dissolution within the potential range of EGOR, which is urgent to be addressed. Importantly, the different reaction mechanisms of EGOR at Au and Cu are found at the molecular level. In detail, the adsorbed 2hydroxyacetyl and glyoxal could be the key reaction intermediates for the generation of glycolate at Au and Cu, respectively. This work might provide theoretical guidance for the electrocatalytic conversion of EG into value-added chemicals, which is further conducive to promoting the upgrading of biomass and waste plastics.

show abstract

Impedance of the copper electrode in isopotential solutions containing complexes of Cu(II) and glycolic acid

Cited by 4 publications

References 3 publications

Impedance of copper electrode in slightly acid Cu(II)-glycine solutions

Impedance of copper electrode in slightly acid Cu(II)-glycine solutions

Iron(III)‐Complexes Engaged in the Biochemical Processes in Seawater. II. Voltammetry of Fe(III)‐Malate Complexes in Model Aqueous Solution

Selective Electrocatalytic Oxidation of Ethylene Glycol into Glycolic Acid at Coin-Group Electrodes: An Investigation on Catalytic Activity and Selectivity

Contact Info

Product

Resources

About