ChemInform Abstract: INITIAL STAGES OF ANODIC OXIDATION OF POLYCRYSTALLINE COPPER ELECTRODES IN ALKALINE SOLUTION

Droog, John M.M.; ALDERLIESTEN, C. A.; Alderliesten, Peter T.; Bootsma, G.A.

doi:10.1002/chin.198047032

Cited by 4 publications

(7 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The voltammetric features labelled AIII, CIV, and CV grew in with cycling until reaching the current densities shown. The voltammogram shown here is qualitatively similar to that reported in the literature (6)(7)(8) and obtained in this lab for Cu in alkali metal hydroxide electrolyte of comparable pH; however, there is a marked difference in the appearance of the copper during cycling in barium hydroxide electro-* Electrochemical Society Active Member. Key Words: superconductor, copper electrochemistry, barium.…”

supporting

confidence: 83%

Towards the Electrochemical Synthesis of High Temperature Superconductors

Zurawski

Kulesza

Wiȩckowski

1988

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

supporting

confidence: 83%

Towards the Electrochemical Synthesis of High Temperature Superconductors

Zurawski

Kulesza

Wiȩckowski

1988

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…[36,[38][39][40] On the reverse sweep, Cu 3 + compounds are reduced to Cu 2 + (peak C4), followed by its further reduction to Cu + (peak C3) and finally the reduction of the remaining Cu + and Cu 2 + species to Cu 0 (peaks C2 and C1, respectively). [35,36,41] Note that the numbering of the voltammetric peaks in Figure 1A-C does not reflect coupling between particular anodic and cathodic processes due to their different electrochemical nature in most cases, with the exception of the well-defined Cu 2 + /3 + redox couple (peaks A4/C4).…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

“…Peak A1 at around 0.51 V [all potentials herein are referenced to the reversible hydrogen electrode (RHE)] is associated with the oxidation of Cu 0 to Cu + , primarily with the formation of Cu 2 O. [35,36] Processes A2 and A3 both generate a mixture of products: the former includes the oxidation of metallic Cu to both Cu 2 O and soluble Cu 2 + species such as [Cu II (OH) 4 ] 2À , [36,37] while the latter represents the conversion of copper metal into Cu(OH) 2 and CuO depending on conditions. [35,36] Lastly, peak A4 is associated with the formation of various Cu 3 + compounds, such as the soluble [Cu III (OH) 4 ] À species as well as surface layers of Cu 2 O 3 and CuOOH.…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

“…[35,36] Processes A2 and A3 both generate a mixture of products: the former includes the oxidation of metallic Cu to both Cu 2 O and soluble Cu 2 + species such as [Cu II (OH) 4 ] 2À , [36,37] while the latter represents the conversion of copper metal into Cu(OH) 2 and CuO depending on conditions. [35,36] Lastly, peak A4 is associated with the formation of various Cu 3 + compounds, such as the soluble [Cu III (OH) 4 ] À species as well as surface layers of Cu 2 O 3 and CuOOH. [36,[38][39][40] On the reverse sweep, Cu 3 + compounds are reduced to Cu 2 + (peak C4), followed by its further reduction to Cu + (peak C3) and finally the reduction of the remaining Cu + and Cu 2 + species to Cu 0 (peaks C2 and C1, respectively).…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

See 1 more Smart Citation

Copper‐Catalyzed Electrosynthesis of Nitrite and Nitrate from Ammonia: Tuning the Selectivity via an Interplay Between Homogeneous and Heterogeneous Catalysis

et al. 2021

View full text Add to dashboard Cite

Electrocatalytic oxidation of ammonia is an appealing, lowtemperature process for the sustainable production of nitrites and nitrates that avoids the formation of pernicious N 2 O and can be fully powered by renewable electricity. Currently, however, the number of known efficient catalysts for such a reaction is limited. The present work demonstrates that copperbased electrodes exhibit high electrocatalytic activity and selectivity for the NH 3 oxidation to NO 2 À and NO 3 À in alkaline solutions. Systematic investigation of the effects of pH and potential on the kinetics of the reaction using voltammetric analysis andin situ Raman spectroscopy suggest that ammonia electrooxidation on copper occurrs via two primary catalytic mechanisms. In the first pathway, NH 3 is converted to NO 2 À via a homogeneous electrocatalytic process mediated by redox transformations of aqueous [Cu(OH) 4 ] À /2À species, which dissolve from the electrode. The second pathway is the heterogeneous catalytic oxidation of NH 3 on the electrode surface favoring the formation of NO 3 À . By virtue of its nature, the homogeneous-mediated pathway enables higher selectivity and was less affected by electrode poisoning with the strongly adsorbed "N" intermediates that have plagued the electrocatalytic ammonia oxidation field. Thus, the selectivity of the Cu-catalyzed NH 3 oxidation towards either nitrite or nitrate can be achieved through balancing the kinetics of the two mechanisms by adjusting the pH of the electrolyte medium and potential.

show abstract

“…12, merely loose contour with time after the immersion of the electrode. Similar developments of cyclic voltammograms are described in the literature (see [20,22]). Surface reconstruction caused by adsorbates is well known from ultra-high vacuum studies [24].…”

Section: Discussionmentioning

confidence: 80%

Impedance Studies of Copper in Alkaline Solutions, Especially During Electroless Plating

Wanner

Wiese

Weil

1988

Ber Bunsenges Phys Chem

View full text Add to dashboard Cite

An impedance study of the electrochemical double layer of copper in an electro less copper plating bath was performed. Of the bath components (formaldehyde, ethylenediamine-tetraacetic acid (EDTA), CuEDTA 2 -, NaOH, Na ZS04, and NaHCOO) only the influence of hydroxide on the double layer is visible from capacitance data. The estimated surface coverage of hydroxide at the mixed potential of the electroless plating process is about 10%. On copper single crystal surfaces the OH --adsorption shows specific characteristics. Due to a surface reconstruction these characteristics, however, disappear with time after the immersion of the electrode. During the deposition process high electrode capacitances are measured (200-500 J-lF/cm 2 ). They are mainly caused by a surface roughness on the microscopic scale. When the deposition process is terminated, the surface relaxes within about 10 minutes. The addition of cyanide or Gafac (a mixture of organic esters of phosphoric acid) to the electroless plating bath markedly influences the capacitance data. However, always a correlation between the deposition rate and the electrode capacitance is observed. If, on the other hand, at potentiostatic cupric ion reduction formaldehyde in the plating bath is substituted by ethylenediamine, which also catalyzes the CuEDTA2--reduction, the capacitance values decrease with increasing deposition current. Presumably, in the first case the nucleation rate dominates the deposit growth, while in the second case the opposite is true. is of electrochemical nature [3 -5]. A mixed potential is established during the chemical deposition process. Electroless copper plating consists of the electrochemical reactions:[CuEDTA]2-+2H 2CO+40H-------+

show abstract

ChemInform Abstract: INITIAL STAGES OF ANODIC OXIDATION OF POLYCRYSTALLINE COPPER ELECTRODES IN ALKALINE SOLUTION

Abstract: Voltammetrische und ellipsometrische Untersuchungen zeigen, daß der Bildung von massivem CuzO im Verlaufe der anodischen Oxidation von polykristallinen Cu‐Elektroden in NaOH‐Lösungen die Elektrosorption von Sauerstoffspezies vorangeht.

Cited by 4 publications

References 1 publication

Towards the Electrochemical Synthesis of High Temperature Superconductors

Towards the Electrochemical Synthesis of High Temperature Superconductors

Copper‐Catalyzed Electrosynthesis of Nitrite and Nitrate from Ammonia: Tuning the Selectivity via an Interplay Between Homogeneous and Heterogeneous Catalysis

Impedance Studies of Copper in Alkaline Solutions, Especially During Electroless Plating

Contact Info

Product

Resources

About