Electrochemical aspects of formation of dendrites

Popov, I Konstantin; Živković, Milutin; Nikolić, Danilo

doi:10.5937/zasmat1601055p

Cited by 13 publications

(10 citation statements)

References 26 publications

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“…4b), the Te and Bi deposits are porous in nature and tend to form dendritic-type structures, as previously is observed for both elements in electrodeposition studies [70,71]. Moreover, it is known that the application of an overpotential can lead to dendrite growth [72] and in this case, the dendritic growth is most likely due to the overpotential applied during the electrodeposition of the sacrificial elements (mostly Cu) as has been shown previously for copper [72][73][74][75][76]. After the deposition of the sacrificial elements, the redox replacement process is followed and the dendritic structure remains as tellurium replaces the sacrificial elements on the electrode surface wherever they have been deposited, i.e.…”

Section: Morphology Of Tellurium Deposits Achieved By Edrr and Ewsupporting

confidence: 58%

Electrochemical recovery of tellurium from metallurgical industrial waste

et al. 2019

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The current study outlines the electrochemical recovery of tellurium from a metallurgical plant waste fraction, namely Doré slag. In the precious metals plant, tellurium is enriched to the TROF (Tilting, Rotating Oxy Fuel) furnace slag and is therefore considered to be a lost resource-although the slag itself still contains a recoverable amount of tellurium. To recover Te, the slag is first leached in aqua regia, to produce multimetal pregnant leach solution (PLS) with 421 ppm of Te and dominating dissolved elements Na, Ba, Bi, Cu, As, B, Fe and Pb (in the range of 1.4-6.4 g dm −3), as well as trace elements at the ppb to ppm scale. The exposure of slag to chloride-rich solution enables the formation of cuprous chloride complex and consequently, a decrease in the reduction potential of elemental copper. This allows improved selectivity in electrochemical recovery of Te. The results suggest that electrowinning (EW) is a preferred Te recovery method at concentrations above 300 ppm, whereas at lower concentrations EDRR is favoured. The purity of recovered tellurium is investigated with SEM-EDS (scanning electron microscope-energy dispersion spectroscopy). Based on the study, a new, combined two-stage electrochemical recovery process of tellurium from Doré slag PLS is proposed: EW followed by EDRR.

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Section: Morphology Of Tellurium Deposits Achieved By Edrr and Ewsupporting

confidence: 58%

Electrochemical recovery of tellurium from metallurgical industrial waste

et al. 2019

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“…In the co-electrodeposition process, over the limiting current density, the metal reduction occurs along with the evolution of hydrogen. The resulting hydrogen evolution and effect of overpotential cause the dendrite growth according to the dynamic hydrogen bubble template (DHBT) theory and direct the Cu–Co electrodeposition via the following reactions (eqs and ): , Upon applying the high negative potential (CED), Cu–Co alloy nucleation begins from Cu–Co precursor ions on a Ni foam substrate and the diffusion-limted growth promotes the successive growth of Cu–Co nanonodule seeds. The high surface and activation energy of nodule seeds extend the anisotropic growth and result in the dendrite architecture .…”

Section: Resultsmentioning

confidence: 99%

“…In the coelectrodeposition process, over the limiting current density, the metal reduction occurs along with the evolution of hydrogen. The resulting hydrogen evolution and effect of overpotential cause the dendrite growth according to the dynamic hydrogen bubble template (DHBT) theory and direct the Cu−Co electrodeposition via the following reactions (eqs 11 and 12):26,27…”

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confidence: 99%

Copper-Cobalt-Based Sulfides: Strategy To Boost Energy Storage Performance Utilizing the Synergistic Effect of a Double Metal Ion

George

Kundu

2022

Energy Fuels

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The copper cobaltite chalcogenides were designed and developed via a simple and economically effective electrochemical route followed by the hydrothermal anion-exchange process without altering the morphological features. The systematic synthetic approach provided spinel crystalline-structured copper cobalt sulfide (CuCo 2 S 4 ) through in situ co-deposition and copper sulfide/cobalt sulfide composite (CuS/CoS) via layer-by-layer deposition. Obtained high-resolution scanning electron microscopy explains the unique dendrite morphology of copper cobalt sulfide (CuCo 2 S 4 ) with a primary midrib followed by secondary and tertiary trunks, whereas CuS/CoS governs a distinct CuS dendrite covered with thin CoS sheets homogeneously. Furthermore, the CuCo 2 S 4 electrode material governed a superior charge storage property in supercapacitor application with a capacitive value of 966−676.8 C g −1 at a current density ranging from 10 to 40 A g −1 with a 70.15% retention value, whereas CuS/ CoS delivered only 455.3−278.8 C g −1 at current densities with 61.23% retention. The promising faradaic behavior of the asprepared material was attributed by the stable charge-discharge profile at different applied current densities as 10, 20, 30, 40, and 10 A g −1 for 5000 cycles for CuCo 2 S 4 and CuS/CoS electrodes, respectively. To evaluate real-time charge storage behavior, an asymmetric device was assembled by coupling the CuCo 2 S 4 electrode with activated carbon electrode using a 3 M KOH aqueous electrolyte. The fabricated device delivered 126.8 and 81.45 C g −1 at 10 and 50 A g −1 , respectively. Moreover, the device demonstrated excellent cycling stability up to 5000 cycles at 50 A g −1 with 96.70% capacitive retention. Thus, the present work demonstrates the most effective strategy to exploit the synergistic effect of bimetal ions to boost the charge storage properties of a ternary chalcogenide electrode.

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“…Indeed, zinc dendrites accelerate growth at critical overpotentials, while several parameters e.g. zincate concentration, local current density and temperature have also affect the initiation of the growth [15]. Several mechanisms have been proposed to describe dendrite formation during the dissolutionelectrodeposition processes.…”

Section: Dendrite Formationmentioning

confidence: 99%

Current status and technical challenges of electrolytes in zinc–air batteries: An in-depth review

Hosseini

Soltani

2021

Chemical Engineering Journal

105

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In the past few years, there has been a growing level of interest in the research and development of energy storage systems such as batteries. This is a direct consequence of the soaring rise in global energy demand across various commercial and industrial sectors. Lithium ion batteries have set out a feasible horizon for widespread deployment as small-scale energy storage devices due to their high efficiency and cyclability. However, the availability and cost of lithium have limited the commercial deployment of large-scale systems. On the other hand, zinc-air batteries have demonstrated comparable efficiencies and have been reported to be suitable replacements for lithium batteries in large-scale applications. Nevertheless, more research has been undertaken to address the issues associated with the cycling processes of these batteries. Secondary zinc-air batteries are yet to be commercially proven feasible due to the low charge/discharge cycle life of electrodes. The main problems of secondary alkaline zinc-air batteries are dendritic growth resulting in an alternation of morphology and structure, self-dissolution and the consequent occurrence of hydrogen evolution reactions. However, by and large, inefficient electrolytes are the main culprits responsible for the reduced performance of zinc-air batteries. Therefore, a comprehensive review of current advancements in the development of suitable electrolytes to promote zinc-air batteries towards commercial application will provide a perspective for future rechargeable zinc-air batteries. In this in-depth review, the effects of the types of electrolytes and their properties on the electrochemical 2 performance of Zn anode have been discussed. A demonstration of the current research status and challenges set upon the large-scale deployment of zinc-air batteries will facilitate the educated steering of future research directions in this critically important realm.

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Electrochemical aspects of formation of dendrites

Cited by 13 publications

References 26 publications

Electrochemical recovery of tellurium from metallurgical industrial waste

Electrochemical recovery of tellurium from metallurgical industrial waste

Copper-Cobalt-Based Sulfides: Strategy To Boost Energy Storage Performance Utilizing the Synergistic Effect of a Double Metal Ion

Current status and technical challenges of electrolytes in zinc–air batteries: An in-depth review

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