Electrochemical study about zinc electrodeposition onto GCE and HOPG substrates

Granados-Ner, Madai; Mendoza-Huízar, Luis Humberto; Ríos-Reyes, Clara Hilda

doi:10.1590/s0100-40422011000300014

Cited by 8 publications

(6 citation statements)

References 16 publications

(17 reference statements)

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“…According to Wuttig et al, micromolar concentrations of Zn 2+ were detected on samples of NaHCO 3 0.1 mol L –1 by inductively coupled plasma mass spectrometry (ICP-MS). In principle, the electrodeposition of zinc, which decreases the active sites for the CO 2 RR, would explain the higher faradic efficiencies obtained in purified bicarbonate electrolyte. − …”

Section: Results and Discussionmentioning

confidence: 63%

Dibenzyldithiocarbamate-Functionalized Small Gold Nanoparticles as Selective Catalysts for the Electrochemical Reduction of CO₂ to CO

Souza

Lima

2021

ACS Catal.

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Dibenzyldithiocarbamate-functionalized gold nanoparticles (DBDTC-Au NPs) were synthesized in the laboratory, and the effects of the DBDTC ligand on the Au electrocatalytic activity for CO2 reduction reaction to CO were investigated in CO2-saturated KHCO3 electrolyte. Our synthesis route produced sub-2.0 nm Au particles, with the number of gold atoms in the range of 67–120, and with strongly bonded and stable DBDTC ligands on the surface. Online differential electrochemical mass spectrometry (DEMS) experiments on the DBDTC-Au nanoparticles showed higher faradic current and higher CO/H2 ratio of their ionic signals compared to those for citrate-capped Au NPs. Quantitative analyses via gas chromatography (GC) showed that our DBDTC-Au catalyst converts CO2 into CO with a faradic efficiency of approximately 100 ± 1% at −0.8 V and 93 ± 0.5% at −1.0 V vs RHE. The higher activity of the synthesized DBDTC-Au electrocatalyst was attributed to the following important functionalities of the DBDTC ligand: (i) the strong bonding to the surface stabilizes the Au NPs, inhibiting the formation of large agglomerates, and (ii) the hydrophobic character of the dibenzyl moieties allows the permeation of CO2, but repels water from the Au surface, minimizing the electrochemical reduction of water and, therefore, enhancing the faradic efficiency for CO formation.

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Section: Results and Discussionmentioning

confidence: 63%

Dibenzyldithiocarbamate-Functionalized Small Gold Nanoparticles as Selective Catalysts for the Electrochemical Reduction of CO₂ to CO

Souza

Lima

2021

ACS Catal.

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“…In previous works, the chemical species and the equilibrium potential in the leached solution have been established through thermodynamic studies using Pourbaix-type diagrams [35][36][37] …”

Section: Resultsmentioning

confidence: 99%

Urban Mining and Electrochemistry: Cyclic Voltammetry Study of Acidic Solutions from Electronic Wastes (Printed Circuit Boards) for Recovery of Cu, Zn, and Ni

Reyes-Valderrama

Salinas‐Rodríguez

Montiel‐Hernández

et al. 2017

Metals

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Abstract:We report potentiodynamic studies to characterize copper, nickel and zinc leaching solutions from electronic waste. The metals were leached using oxygen and sulfuric acid (pH = 1.5). As is known, reduction potentials are determined using thermodynamics laws, and metal recovery strategies from electronic waste are usually considered according these thermodynamic values. Pourbaix-type diagrams are not appropriate to plan strategies in electrochemical processing. Therefore, knowledge of electrode potentials for the metal deposit/dissolution process is the basis for the selective recovery planning. For this reason, potentiodynamic studies, specifically cyclic voltammetry, are revealed as a good way to decide the best conditions for the process of electrochemical recovery of metals from electronic waste, which is also cost-efficient and has no interference from strange ions, such as lead, in this case.

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“…The stability of the zinc ions could be affected by the presence of sulphate ions, promoting the formation of zinc sulphate complex on the electrode surface. These less conductive sulphates could act as a physical barrier [14]. In addition, despite the explanation for the deleterious effect of Na ions is not straightforward, it has been previously reported that Na ions decrease the current efficiency in the electrodeposition of Co powders [15] and this was attributed to a non-uniform layer of deposited metal on the surface of the electrode, that seems to facilitate hydrogen evolution.…”

Section: Resultsmentioning

confidence: 99%

Influence of Na⁺, K⁺, Mn²⁺, Fe²⁺and Zn²⁺ions on the electrodeposition of Ni-Co alloys: Implications for the recycling of Ni-MH batteries

Blanco

Orta-Rodriguez

Delvasto

2017

J. Phys.: Conf. Ser.

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Abstract.A hydrometallurgical recycling procedure for the recovery of a mixed rare earths sulfate and an electrodeposited Ni-Co alloy has been described. The latter step was found to be complex, due to the presence of several ions in the battery electrode materials. Electrochemical evaluation of the influence of the ions on the Ni-Co alloy deposition was carried out by cyclic voltammetry test. It was found that ions such as K + , Fe 2+ and Mn 2+ improved the current efficiency for the Ni-Co deposition process on a copper surface. On the other hand, Na + and Zn 2+ ions exhibited a deleterious behaviour, minimizing the values of the reduction current. The results were used to suggest the inclusion of additional steps in the process flow diagram of the recycling operation, in order to eliminate deleterious ions from the electroplating solution. IntroductionNi-MH batteries are mainly composed of nickel (in oxidized and metallic form), cobalt, alkaline electrolyte substances and rare earths metal alloys [1][2][3][4][5]. Although it is difficult to get exact numbers for the usage of Ni-MH batteries in Latin America, it has been reported that this kind of batteries account for 2.7% (by weight) of the total household spent batteries, as collected in communal recycling procedures in Venezuela [6]. This number can be regarded as representative, for most countries within the region. New legislation changes issued in the Latin American countries have encouraged the application of valorisation strategies, not only to prevent environmental damage, but also to recover metal values from this kind of electronic wastes. A feasible solution for this local problem could be the adoption of small-scale hydrometallurgical facilities, in order to process these wastes without the need of exporting them to other countries, most of which are usually located in Europe and East Asia [7]. Nickel, cobalt and rare earths are strategic materials, which are worth to be recovered from depleted Ni-MH batteries; nevertheless, the hydrometallurgical recycling of Ni-MH batteries is a challenging issue, due to its internal chemical complexity [1][2][3][4][5][6][7][8]. In a previous paper [7], a small-scale hydrometallurgical processing route was devised, comprising a chemical stage and an electrochemical stage. During the chemical stage, the active electrode materials of the Ni-MH batteries were leached using aqueous H 2 SO 4 . The obtained pregnant solution was then submitted to pH adjustment in a settling reactor, in which the rare earths were recovered as an insoluble complex sulphate. The remnant solution, containing nickel, cobalt and some other ions is then electrolyzed, in order to recover a Ni-Co alloy [7]. This latter stage is not yet well understood, because of the interaction of the several ions present in the solution.

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Electrochemical study about zinc electrodeposition onto GCE and HOPG substrates

Cited by 8 publications

References 16 publications

Dibenzyldithiocarbamate-Functionalized Small Gold Nanoparticles as Selective Catalysts for the Electrochemical Reduction of CO₂ to CO

Dibenzyldithiocarbamate-Functionalized Small Gold Nanoparticles as Selective Catalysts for the Electrochemical Reduction of CO₂ to CO

Urban Mining and Electrochemistry: Cyclic Voltammetry Study of Acidic Solutions from Electronic Wastes (Printed Circuit Boards) for Recovery of Cu, Zn, and Ni

Influence of Na⁺, K⁺, Mn²⁺, Fe²⁺and Zn²⁺ions on the electrodeposition of Ni-Co alloys: Implications for the recycling of Ni-MH batteries

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Electrochemical study about zinc electrodeposition onto GCE and HOPG substrates

Cited by 8 publications

References 16 publications

Dibenzyldithiocarbamate-Functionalized Small Gold Nanoparticles as Selective Catalysts for the Electrochemical Reduction of CO2 to CO

Dibenzyldithiocarbamate-Functionalized Small Gold Nanoparticles as Selective Catalysts for the Electrochemical Reduction of CO2 to CO

Urban Mining and Electrochemistry: Cyclic Voltammetry Study of Acidic Solutions from Electronic Wastes (Printed Circuit Boards) for Recovery of Cu, Zn, and Ni

Influence of Na+, K+, Mn2+, Fe2+and Zn2+ions on the electrodeposition of Ni-Co alloys: Implications for the recycling of Ni-MH batteries

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Dibenzyldithiocarbamate-Functionalized Small Gold Nanoparticles as Selective Catalysts for the Electrochemical Reduction of CO₂ to CO

Dibenzyldithiocarbamate-Functionalized Small Gold Nanoparticles as Selective Catalysts for the Electrochemical Reduction of CO₂ to CO

Influence of Na⁺, K⁺, Mn²⁺, Fe²⁺and Zn²⁺ions on the electrodeposition of Ni-Co alloys: Implications for the recycling of Ni-MH batteries