Electrochemical behavior of aqueous acid perrhenate-containing solutions on noble metals: critical review and new experimental evidence

Méndez, Eduardo; Cerdá, Marı́a Fernanda; Luna, A.M. Castro; Zinola, C.F.; Kremer, Carlos; Martins, M.E.

doi:10.1016/s0021-9797(03)00165-6

Cited by 36 publications

(46 citation statements)

References 52 publications

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“…For this reason, and in order to allow a more adequate assignation of the observed redox signals, voltammetric profiles of perrhenate solutions were also evaluated ( Figure 7). Thus, and taking also into account previously , 3 (20) 7-15 (2007) reported results (22,23), peaks were attributed to species with different Re oxidation states as described in Table II. As can be observed in Figure 6, when a lower potential E c = -0.62 V is reached (for an upper potential E a = 0.0 V), the following potential scan towards the positive potentials direction showed a marked increase in the E a at ca.…”

Section: Characterization Of the Complexessupporting

confidence: 64%

Voltammetric Characterization of [ReO]3+ Containing Complexes

Cerdá¹,

Kremer²,

Luna

et al. 2007

ECS Trans.

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In the present work, the voltammetric profiles of Au-pc in 1 mM solutions of K[Re V OCl 2 (L)] (L = dianions of H 2 hida or H 2 eida; hida, n-(2,6-dimethylphenyl carbamoylmethyl)imino diacetic acid, and eida, 2,6-diethyl ida) complexes were evaluated. The obtained electrochemical response was the result of the contributions coming from the [ReO] 3+ core (E pa at ca. 0.2 V vs. Ag/AgNO 3 ) and the carboxylic group of the ligand. There where also observed redox contributions ascribed to the presence of perrhenate coming from the decomposition of the complex with the lost of ligands, in agreement with the low stability of the studied complexes.

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Section: Characterization Of the Complexessupporting

confidence: 64%

Voltammetric Characterization of [ReO]3+ Containing Complexes

Cerdá¹,

Kremer²,

Luna

et al. 2007

ECS Trans.

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“…It was interesting to asses the formation of soluble species of [ReniO]+, a process that was postulated in previous works (22,23) The study of perrhenate solutions allowed confirming some of the hypothesis mentioned above. As can be observed in figure 7, the presence of anodic peaks 1 and 2 (at -0.50 V and -0.43 V respectively) depended on the applied potential lower limit.…”

Section: Characterization Of the Complexesmentioning

confidence: 52%

“…For this reason, and in order to allow a more adequate assignation of the observed redox signals, voltammetric profiles of perrhenate solutions were also evaluated (Figure 7). Thus, and taking also into account previously reported results (22,23), peaks were attributed to species with different Re oxidation states as described in Table II. Anodic contribution at -0.46 V (related to ReO2 formation) was present in the profile even in the first cycle of potential scan, and the intensity of its current peaks grow up in the following potential scans.…”

Section: Characterization Of the Complexesmentioning

confidence: 86%

“…Finally, anodic contributions at -0.26 V and -0.17 V were assigned to perrhenate formation from ReO2; this process took place at different applied potential depending on the layers of adsorbed rhenium dioxide (22). Oxidation from bidimensional monolayers happened at -0.26 V, and from dioxide multilayers were observed at -0.17 V.…”

Section: Characterization Of the Complexesmentioning

confidence: 98%

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Voltammetric Characterization of [ReO]3+ Containing Complexes

Cerd Bresciano,

Mendez,

Kremer

et al. 2006

Meet. Abstr.

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In the present work, the voltammetric profiles of Au-/?c in 1 mM solutions of K[RevOC12(L)] (L = dianions of H2hida or H2eida; hida, n-(2,6-dimethylphenyl carbamoylmethyl)imino diacetic acid, and eida, 2,6-diethyl ida) complexes were evaluated. The obtained electrochemical response was the result of the contributions coming from the [ReO]3+ core (Epa at ca. 0.2 V vs. Ag/AgNO3) and the carboxylic group of the ligand. There where also observed redox contributions ascribed to the presence of perrhenate coming from the decomposition of the complex with the lost of ligands, in agreement with the low stability of the studied complexes.

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“…Moreover, H ad reacts with the previously deposited ReO 2 layer, resulting in the formation of Re͑III͒-soluble species, which subsequently undergo disproportionation to Re and ReO 2 . 23 Taking into consideration the possible reactions, an overall expression for the disproportionation of Re ions can be presented as Eq. 5.…”

Section: Resultsmentioning

confidence: 99%

Electroless Deposited Co–Re–P and Co–Re–Ni–P Coatings: Elemental State of the Alloy Components and Their Localization

Valova

Armyanov

Dille

et al. 2008

J. Electrochem. Soc.

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The effect of Re on the composition distribution and structure of Co-Re-P and Co-Re-Ni-P electroless coatings is studied. The participation of disproportionation reactions during perrhenate reduction to the elemental state, coupled with the two-electron reduction of Re͑VII͒ to Re͑VI͒ by hypophosphite, is proposed as an explanation for the mechanism of Re codeposition. This also gives an explication of the increased efficiency of hypophosphite in the presence of perrhenate, and the observed extremely low P percentage in the coatings. The deposits have a hexagonal close-packed ͑hcp͒ lattice with a texture ͗1010͘. Uniform cross sections of the films, prepared by the focused ion beam technique, are used to characterize the nanocrystalline columnar structure in relation to the composition distribution by applying high-resolution analytical electron microscopy. Besides the partial localization of Re at the grain boundaries, it is alloyed with Co and Ni within the crystalline grains. This could be considered as evidence of two possible ways of Re inclusion in the alloys. The parameters of the hcp lattice increase with the Re content in the alloys. The impact of Re and its distribution in the nanocrystalline structure on the magnetic properties of the coatings is demonstrated.During the last two decades of the 20th century, Co-Ni-Re-Pbased alloys have been intensively investigated because of their possible application as perpendicular recording media. 1-7 The search logically started in the direction of the improvement of electroless deposited Co-P with fiber texture ͗0001͘. Ni has been added to reduce the magnetization, and Mn to enhance the ͗0001͘ texture. 1-3 Later, the addition of Re to a Co-Ni-Mn-P alloy ensured further diminution of the magnetization. 4-6 In addition, Re having a hexagonal close-packed ͑hcp͒ lattice should increase the Co-Ni concentration interval with the hcp structure.Using a selective chemical etching method, it has been clarified that electroless deposited Co 32 -Ni 55 -Re 6 -P 7 films have a segregated structure: Co-rich, ferromagnetic parts with a high crystallinity are dispersed in a Ni-P-based nonmagnetic medium with a low crystallinity. 7 The segregation occurs from the nucleation stage and is preserved during the film growth up to 200 nm. Above this thickness, the film consists of highly crystallized particles with a mean diameter of 20 nm, forming a columnar structure, which is segregated in the nonmagnetic region with a low crystallinity. The microstructure of this nonmagnetic matrix is stable to heat-treatment of up to 500°C. 7 The expanding of the interplanar spacing of hcp ͑0001͒ planes has only been observed for Re codeposition, owing to the large diameter of the Re atom in contrast with the diameters of Ni and P. A linear increase of this spacing with Re content has been found. 8,9 Recently, the research interest has been raised in corrosion protective and barrier properties of Ni-P and Co-P-based alloys with refractory metals including Re, and their electroless deposition regained...

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Electrochemical behavior of aqueous acid perrhenate-containing solutions on noble metals: critical review and new experimental evidence

Cited by 36 publications

References 52 publications

Voltammetric Characterization of [ReO]3+ Containing Complexes

Voltammetric Characterization of [ReO]3+ Containing Complexes

Voltammetric Characterization of [ReO]3+ Containing Complexes

Electroless Deposited Co–Re–P and Co–Re–Ni–P Coatings: Elemental State of the Alloy Components and Their Localization

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