The autocatalytic reduction of copper(II) by cobalt(II) in aqueous diethylenetriamine solutions studied by EQCM

Vaškelis, Algirdas; Stankevičienė, Ina; Jagminienė, Aldona; Tamašauskaitė–Tamašiūnaitė, Loreta; Norkus, Eugenijus

doi:10.1016/j.jelechem.2008.05.012

Cited by 11 publications

(11 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results agree with those previously seen in voltammetric curves, which suggested that the Cu (II) ion reduction in a Cu-Co bath containing glycine was favored by the increase of [Co 2+ ], most likely due to the formation of Co (II)-glycine complexes that may act as strong reducing agents, enhancing the Cu (II) ions deposition by electroless process [39,40]. It is important to mention, however, that the reduction process of Cu (II) ions (either by electrochemical or electroless paths) in the presence of Co (II)-amine complexes is strongly dependent on the pH, the kind of the amine ligand and on [Co 2+ ] [39,40].…”

Section: Copper Content In the Alloy (Wt% Cu)supporting

confidence: 91%

“…It means that, increased [Co 2+ ] may enhance Cu (II) deposition from these baths. Considering that many Co (II) complexes with amines are labile and act as strong reducing agents capable of reducing some metal ions (such as Cu (II)) to the metallic state through an electroless process [39,40], the presence of Co (II)-glycine complexes most likely enhanced electroless Cu (II) reduction, explaining the shift of C′2 to less negative potentials.…”

Section: Resultsmentioning

confidence: 99%

“…It is important to mention, however, that the reduction process of Cu (II) ions (either by electrochemical or electroless paths) in the presence of Co (II)-amine complexes is strongly dependent on the pH, the kind of the amine ligand and on [Co 2+ ] [39,40].…”

Section: Copper Content In the Alloy (Wt% Cu)mentioning

confidence: 99%

See 2 more Smart Citations

Response surface modeling and voltammetric evaluation of Co-rich Cu–Co alloy coatings obtained from glycine baths

Lima¹,

Rocha²,

Braga³

et al. 2015

Surface and Coatings Technology

View full text Add to dashboard Cite

Section: Copper Content In the Alloy (Wt% Cu)supporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Response surface modeling and voltammetric evaluation of Co-rich Cu–Co alloy coatings obtained from glycine baths

Lima¹,

Rocha²,

Braga³

et al. 2015

Surface and Coatings Technology

View full text Add to dashboard Cite

“…Ethylenediamine as a ligand is not an exclusive amine for Co 3+ -Co 2+ redox couples in the electroless copper plating systems. Co 2+ complexes with other higher polyamines, e.g., propylene diamine (propane-1,2-diamine) [ 29 , 30 ], diethylenetriamine [ 31 , 32 ], or pentaethylenehexamine [ 33 ], and are eligible reducing agents to reduce Cu 2+ to the metallic state on a surface to be plated.…”

Section: Introductionmentioning

confidence: 99%

Electroless Platinum Deposition Using Co3+/Co2+ Redox Couple as a Reducing Agent

Tamašauskaitė–Tamašiūnaitė

Dordi

Norkus

et al. 2021

Materials

Self Cite

View full text Add to dashboard Cite

In the present work, the kinetics of electroless deposition of Pt, using a cobalt ion redox system (Co3+/Co2+) as a reducing agent, has been investigated. The deposition rate of Pt depends on the pH, concentration of reactants, and temperature. The deaeration and bubbling of the plating solution with argon play an essential role. It was found that 0.11 mg cm−2 of Pt films could be deposited on the surface of a roughed glass sheet in one hour without replenishing the solution. Additional data have been obtained on the grounds of electrochemical quartz crystal microbalance experiments. The bubbling (agitation) of the electroless Pt plating solution with argon during the deposition of Pt results in a higher deposition rate and is ca. 3 µg cm−2 min−1. The Pt deposition rate is far less, and is as low as 0.14 µg cm−2 min−1 when the electroless Pt plating solution is not bubbled with argon during the deposition of Pt.

show abstract

“…Then, the sub-layer of Co was deposited on the TiO 2 NTs surface via electroless deposition as previously reported. 31 Deposition of electroless Co layer was carried out for 45 min at room temperature. The Au crystallites were deposited on the prepared Co/TiO 2 -NTs electrodes by their immersion into 1 mM HAuCl 4 + 0.1 M HCl (denoted as Au(III)-containing solution) for 0.5, 1 and 5 min, respectively.…”

mentioning

confidence: 99%

AuCo/TiO₂-NTs Anode Catalysts for Direct Borohydride Fuel Cells

Santos

Balčiūnaitė

Tamašauskaitė–Tamašiūnaitė

et al. 2016

J. Electrochem. Soc.

View full text Add to dashboard Cite

Gold-cobalt catalysts deposited on titania nanotubes surface (denoted as AuCo/TiO 2 -NTs) are studied as possible anode materials for direct borohydride/hydrogen peroxide fuel cells. The morphology and composition of the catalysts is characterized by field emission scanning electron microscopy and by inductively coupled plasma optical emission spectroscopy. The fuel cell measurements are performed at four temperatures, in the 25-55 • C range, on a lab-scale direct alkaline NaBH 4 -H 2 O 2 single fuel cell. Polarization curves are recorded to evaluate the fuel cell performance using each prepared anode catalyst. The peak power density dependence on temperature is in the 87-102 mWcm -2 range for Co/TiO 2 -NTs catalyst and in the 163-283 mWcm -2 range for the AuCo/TiO 2 -NTs catalysts with Au loadings ranging from 10 to 60 μg Au cm -2 . The present results demonstrate that power density is raised by over 150% due to the use of AuCo/TiO 2 -NTs as anode catalysts.The direct borohydride fuel cell (DBFC), using sodium borohydride (NaBH 4 ) aqueous solution as the fuel, has been the focus of many investigations during the last decade. 1-7 This low-temperature fuel cell has specific features that make it a promising power source for portable applications. Those features include high energy density (9.3 Wh g −1 at 1.64 V), low toxicity of its reactants and products, and their easy storage and good stability in alkaline solution. 1,[8][9][10][11] Noble metals like platinum (Pt) or gold (Au) have been extensively studied as anodes for borohydride (BH 4 − ) oxidation in DBFCs. But in contrast to Pt, which is also catalyst for the detrimental BH 4 − hydrolysis reaction, Au has demonstrated high coulombic efficiency for the borohydride oxidation reaction (BOR). However, the use of Au as an electrode material is limited by its high price. One way to reduce the Au amount is to disperse Au nanoparticles (NPs) on a technologically relevant substrate. [12][13][14][15][16] Recently, alloying Au with transition metals such as Ni, 17-21 Co 21-23 and Cu 20,24-26 enables reduced cost and better catalytic features for BOR. It has been determined that bimetallic catalysts usually have higher activity and stability than the monometallic ones. 17-26 Moreover, bimetallic catalysts are of wide interest since they lead to many interesting size-dependent electrical, chemical and optical properties. Bimetallic NP catalysts are particularly important because they usually consist of a primary metal that has high electrocatalytic activity and a secondary metal that can either enhance the catalytic efficiency toward BOR or inhibit BH 4 − hydrolysis. 20,27 The 3d transition metals (Fe, Co, Ni, Cu, Zn) are able to enhance the electrochemical activity of bimetallic catalysts for BH 4 − oxidation and reduce the total cost of the electrocatalyst. It has been shown that prepared Au-Co, Au-Ni and Au-Zn bimetallic catalysts with different ratios attained excellent electrochemical performances as anodes for the DBFC. [18][19][20][21][22][23]27 In the present ...

show abstract

The autocatalytic reduction of copper(II) by cobalt(II) in aqueous diethylenetriamine solutions studied by EQCM

Cited by 11 publications

References 11 publications

Response surface modeling and voltammetric evaluation of Co-rich Cu–Co alloy coatings obtained from glycine baths

Response surface modeling and voltammetric evaluation of Co-rich Cu–Co alloy coatings obtained from glycine baths

Electroless Platinum Deposition Using Co3+/Co2+ Redox Couple as a Reducing Agent

AuCo/TiO₂-NTs Anode Catalysts for Direct Borohydride Fuel Cells

Contact Info

Product

Resources

About

The autocatalytic reduction of copper(II) by cobalt(II) in aqueous diethylenetriamine solutions studied by EQCM

Cited by 11 publications

References 11 publications

Response surface modeling and voltammetric evaluation of Co-rich Cu–Co alloy coatings obtained from glycine baths

Response surface modeling and voltammetric evaluation of Co-rich Cu–Co alloy coatings obtained from glycine baths

Electroless Platinum Deposition Using Co3+/Co2+ Redox Couple as a Reducing Agent

AuCo/TiO2-NTs Anode Catalysts for Direct Borohydride Fuel Cells

Contact Info

Product

Resources

About

AuCo/TiO₂-NTs Anode Catalysts for Direct Borohydride Fuel Cells