Voltammetric Characterization of Oxide Films Formed on Copper in Air

Nakayama, Shigeyoshi; Kimura, Atsushi; Shibata, Masahiro; Kuwabata, Susumu; Osakai, Toshiyuki

doi:10.1149/1.1409545

Cited by 70 publications

(81 citation statements)

References 29 publications

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“…1 M KOH. 28,30 Copper hydroxyl oxides (Cu 2 (OH) 3 Cl and Cu(OH)Cl) are only stable at around pH 3.5 to 5.5, 3,31 while Cu 2 O is more stable in neutral to alkaline environments. 0.1 M Na 2 CO 3 is basic with a pH of 11.5, which resulted in different reduction potentials for paratacamite and cuprite.…”

Section: Resultsmentioning

confidence: 99%

Atmospheric Corrosion of Cu during Constant Deposition of NaCl

Lin

Frankel

2013

J. Electrochem. Soc.

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A laboratory environment chamber with a constant deposition rate of NaCl was built. With this chamber, the corrosion behavior of Cu during constant NaCl deposition was investigated with different CO 2 concentrations and ultraviolet (UV) illumination. XRD and coulometric reduction techniques were used to identify and quantify the corrosion products. An Na 2 CO 3 solution was found to be more suitable than KCl solutions for quantification of Cu corrosion products. Cuprite was always the dominant corrosion product during exposure of Cu in various environments. UV illumination accelerated formation of cuprite significantly but had very little effect on formation of cupric corrosion product. CO 2 in the environment was important in determination of cupric corrosion products. With 350 ppm CO 2 , paratacamite was the dominant product, while tenorite was dominant with <1 ppm CO 2 . This explains why tenorite is not a common cupric corrosion product in the field. Pitting corrosion was always the dominant form of corrosion at the beginning of the exposure period but uniform corrosion dominated at later times. The new environment chamber enables the determination of Cu corrosion kinetics in the lab, especially the formation of paratacamite, which provides insight into Cu atmospheric corrosion in the field. Atmospheric corrosion of Cu in the field and in laboratory chambers has been widely studied because of the use of Cu in electronics and architecture.1-6 NaCl has a strong accelerating influence on Cu corrosion in the field, especially in marine environments. 5,6 The effects of NaCl have also been investigated in laboratory-based atmospheric corrosion studies.7-12 NaCl has been shown to accelerate the breakdown of the naturally formed and protective copper oxide by the formation of copper chloride complexes, 11 especially at high relative humidity (RH). When the RH is higher than the critical relative humidity of NaCl, 75%, 13 deposition of 4 μg /cm 2 of NaCl before exposure increases the Cu corrosion rate of Cu by about one order of magnitude during 10 days exposure. 8 NaCl has also been shown to be critical for formation of Cu 2 (OH) 3 Cl, a common corrosion product found in marine environments. 3 In the presence of NaCl, cuprite (Cu 2 O) can be readily oxidized to atacamite or paratacamite, which are isomers of Cu 2 (OH) 3 Cl.12 However, because of difficulties generating a constant deposition rate of NaCl during lab exposure, there is a lack of information on the kinetics of Cu 2 (OH) 3 Cl formation and how Cu 2 (OH) 3 Cl affects the Cu corrosion rate.Methods used to introduce NaCl onto a surface for laboratory study of atmospheric corrosion of Cu and other metals include deposition of NaCl particles before exposure by fast evaporation of ethanolic NaCl solution, 8,11 thermophoretic deposition 14,15 or printing. 16 A disadvantage of prior deposition for the study of Cu corrosion kinetics is that the available NaCl in the environment decreases with time due to formation of Cu 2 (OH) 3 Cl or CuCl during exposure. Furthe...

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Section: Resultsmentioning

confidence: 99%

Atmospheric Corrosion of Cu during Constant Deposition of NaCl

Lin

Frankel

2013

J. Electrochem. Soc.

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“…Recently, copper-based nanomaterials have received attention because of their potential application in optoelectronic devices, catalysis and superconductors. CuO is a p-type semiconductor (E g ¼ 1.2 eV) with excellent photovoltaic, electrochemical, and catalytic properties [21][22][23][24]. Also, it is inexpensive, non-toxic, and readily available.…”

Section: Preparation and Characterization Of Cuo Nanoparticles Startimentioning

confidence: 99%

Emergent methods to synthesize and characterize semiconductor CuO nanoparticles with various morphologies – an overview

Anandan

Yang

2007

Journal of Experimental Nanoscience

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Nanotechnology can be defined as the science and engineering involved in the design, synthesis and application of materials and devices on the nanometer scale. It is not in itself a single emerging discipline, but rather a meeting of several traditional sciences such as chemistry, physics, materials science, biology and engineering to bring together the required expertise needed to develop these new technologies. The unique properties of nanoscale materials provide benefits in remediation, pollution prevention, and efficient use of resources; however, the greatest contribution to green chemistry is likely to be the new manufacturing strategies available through nanoscience. So, the present review mainly focuses on the synthesis of semiconductor CuO nanomaterials from different starting materials by adopting various routes such as vapor-solid, vapor-liquid-solid, solid-liquid, etc. to reveal the morphological features of the precursor.

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“…It suggested that copper oxide substance except Cu 2 O is also included in the Cu-oxide electrode with the oxidation temperature of 250°C. By double sweep cyclic voltammetry method (DSCV method), 33,34) CuO and Cu(OH) 2 in the Cu-oxide film were actually detected. The CuO contributes the potential ennoblement immediately after light irradiation.…”

Section: Surface Reactions Of the Electrode During Lightmentioning

confidence: 99%