Features of hydrogen evolution during electrodeposition of loose deposits of copper, nickel and zinc

Никитин, В. С.; Останина, Т. Н.; Рудой, В. М.; Kuloshvili, Tina-Tini Saulis Asuli; Даринцева, А. Б.

doi:10.1016/j.jelechem.2020.114230

Cited by 28 publications

(10 citation statements)

References 35 publications

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“…The current increased steeply after reaching a current density minimum at 300 s. In this experiment, the transferred electric charge was Q 2100 = 1.953 C.cm 2 , almost doubling the value obtained at -2000 mV. The shape of the curve can be explained, not only by the metal / hydrogen codeposition 24 and bubbling-promoted convection, but also by the growth on the coating of metallic 3-D projections towards the electrolyte bulk 19 . Then there is an overlapping of phenomena, so that the transferred electric charge characterizes the global process.…”

Section: Electroplating Process Of the Active Electrodes For Hermentioning

confidence: 50%

Micro-recycling of spent Ni-Cd batteries for the obtention of electrocatalytic coatings

Delvasto

Rueda

Monsalve

et al. 2022

Preprint

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A micro-recycling approach was explored to produce catalytic metallic coatings for the hydrogen evolution reaction (HER). For this aim, discarded Ni-Cd batteries were employed as raw material. After dismantling the batteries, the active powder material, containing Cd and Ni compounds, was leached in a solution containing citric acid and hydrogen peroxide. The dissolved metals were electro-deposited on copper plates using a two electrodes cell at the following potentials (mV): -1900, -2000, and -2100 mV. The CdNi coating produced at -2000 mV, contained 92.6 % Cd and 7.4 % Ni. This coating was studied by cyclic voltammetry (CV) and potentiodynamic analysis in two different KOH solutions (0.1 M and 1.0 M). The CV analysis showed that the CdNi electrode was electrochemically stable in a wide operating voltage range (between oxygen evolution reaction and HER). Using an uncompensated resistance correction, the Tafel slopes for HER were obtained. The potentiodynamic analysis revealed that the synthesized CdNi electrode showed a catalytic activity for HER just 25.5 % smaller than the correspondent response of a standard pure Ni electrode. Our results serve as a proof of concept about the application of micro-recycling of spent batteries to produce sustainable electroactive catalytic materials for hydrogen production.

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Section: Electroplating Process Of the Active Electrodes For Hermentioning

confidence: 50%

Micro-recycling of spent Ni-Cd batteries for the obtention of electrocatalytic coatings

Delvasto

Rueda

Monsalve

et al. 2022

Preprint

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“…These compounds form enough strong complexes with Ag(I) ions to cause a decrease in j 0 for Ag and its transfer from the group of the normal metals into the group of the intermediate metals. The 3D pine-like dendrites of Cu with well-defined corncob-like branches represent the typical shape of Cu dendrites obtained by electrolysis processes [45][46][47][48].…”

Section: Correlation Between Morphology and Crystal Structure Of The Powder Particlesmentioning

confidence: 83%

Correlation of Morphology and Crystal Structure of Metal Powders Produced by Electrolysis Processes

Nikolić

Maksimović

Avramović

2021

Metals

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In this review paper, morphologies of metal powders produced by the constant (potentiostatic and galvanostatic) regimes of electrolysis from aqueous electrolytes are correlated with their crystal structure at the semiquantitative level. The main parameters affecting the shape of powder particles are the exchange current density (rate of electrochemical process) and overpotential for hydrogen evolution reaction. Depending on them, various shapes of dendrites (the needles, the two-dimensional (2D) fern-like, and the three-dimensional (3D) pine-like dendrites), and the particles formed under vigorous hydrogen evolution (cauliflower-like and spongy-like particles) are produced by these regimes of electrolysis. By decreasing the exchange current density value, the crystal structure of the powder particles is changed from the strong (111) preferred orientation obtained for the needle-like (silver) and the 2D (lead) dendrites to the randomly orientated crystallites in particles with the spherical morphology (the 3D dendrites and the cauliflower-like and the spongy-like particles). The formation of metal powders by molten salt electrolysis and by electrolysis in deep eutectic solvents (DESs) and the crystallographic aspects of dendritic growth are also mentioned in this review.

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“…These side reactions will lead to limited plating/stripping CE and poor reversibility of the Zn electrode. 38,39 The H 2 and OH À generated due to side reactions can also yield safety risks for the closed cell and generate an electrochemical inactive layer, respectively. 40 Thus, the issues faced by Zn electrodes in alkaline and mild electrolytes need to be distinguished before proposing solutions to enhance their performance.…”

Section: Challenges and Strategiesmentioning

confidence: 99%

Aqueous Zn‐based rechargeable batteries: Recent progress and future perspectives

Gaixia

Yang

et al. 2021

InfoMat

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Benefiting from the advantageous features of high safety, abundant reserves, low cost, and high energy density, aqueous Zn‐based rechargeable batteries (AZBs) have received extensive attention as promising candidates for energy storage. To achieve high‐performance AZBs with high reversibility and energy density, great efforts have been devoted to overcoming their drawbacks by focusing on the modification of electrode materials and electrolytes. Based on different cathode materials and aqueous electrolytes, the development of aqueous AZBs with different redox mechanisms are discussed in this review, including insertion/extraction chemistries (e.g., Zn2+, alkali metal ion, H+, NH4+, and so forth) dissolution/deposition reactions (e.g., MnO2/Mn2+), redox couples in flow batteries (e.g., I3−/3I−, Br2/Br−, and so forth), oxygen electrochemistry (e.g., O2/OH−, O2/O22−), and carbon dioxide electrochemistry (e.g., CO2/CO, CO2/HCOOH). In particular, the basic reaction mechanisms, issues with the Zn electrode, aqueous electrolytes, and cathode materials as well as their design strategies are systematically reviewed. Finally, the remaining challenges faced by AZBs are summarized, and perspectives for further investigations are proposed.

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Features of hydrogen evolution during electrodeposition of loose deposits of copper, nickel and zinc

Cited by 28 publications

References 35 publications

Micro-recycling of spent Ni-Cd batteries for the obtention of electrocatalytic coatings

Micro-recycling of spent Ni-Cd batteries for the obtention of electrocatalytic coatings

Correlation of Morphology and Crystal Structure of Metal Powders Produced by Electrolysis Processes

Aqueous Zn‐based rechargeable batteries: Recent progress and future perspectives

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