The influence of Al substrate intermetallic precipitates on zinc electrodeposition

Gu, Ping; Pascual, R.; Shirkhanzadeh, M.; Saimoto, S.; Scott, J. D.

doi:10.1016/0304-386x(94)00048-8

Cited by 15 publications

(4 citation statements)

References 16 publications

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“…The combined results indicate that zinc nucleation sites correlate to the surface roughness, and electrochemical properties. 6,[12][13][14] The displacement reaction between anodic aluminum and cathodic zinc ion continues at a considerably fast rate, resulting in the formation of large zinc particles near the dissolution holes as seen in Fig. 5.…”

Section: Resultsmentioning

confidence: 93%

Nucleation and Growth of Zinc Particles on an Aluminum Substrate in a Zincate Process

Lee

Kim

2007

Journal of Elec Materi

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The nucleation and growth of zinc particles during a conventional zincate process were investigated. Zinc particles preferentially nucleated on the peak or edge of an aluminum surface and preferentially grew with the (0001) plane on hexagonal platelets, forming localized islands. Zinc particles were found to have characteristic orientations and shapes which were dependent on the bath temperature. The increase in temperature in a zincating bath caused the shape and orientation to change from hexagonal (0001) to a starfish-like shape.

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Section: Resultsmentioning

confidence: 93%

Nucleation and Growth of Zinc Particles on an Aluminum Substrate in a Zincate Process

Lee

Kim

2007

Journal of Elec Materi

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“…As for the anodic scan, generally, multiple anodic peaks could be due to the stripping charge of the bulk deposit and the charge for a monolayer of bismuth telluride on the basal plane . In addition, there are other possible explanations for this type of phenomenon, such as underpotential deposition, alloy formation with the substrate, diffusion of cations into the substrate, and the presence of more than one type of deposited bismuth telluride (such as epitaxial growth on different faces or nonepitaxial growth).…”

Section: Resultsmentioning

confidence: 99%

Effects of Annealing and Doping on Nanostructured Bismuth Telluride Thick Films

Soliman

Zhou

et al. 2008

Chem. Mater.

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Bismuth telluride is the state-of-the-art thermoelectric (TE) material for cooling applications with a figure of merit of ∼1 at 300 K. There is a need for the development of TE materials based on the concept of thick films for miniaturized devices due to mechanical and manufacturing constraints for the thermoelement dimensions. We reported earlier a method for the fabrication of high-quality nanostructured bismuth telluride thick films with thickness from 100 to 350 µm based on electrochemical deposition techniques. In this paper, annealing is performed to further improve the TE performance of the nanostructured bismuth telluride thick films and n/p-type solid solutions are successfully fabricated by doping Se and Sb, respectively. The conditions for both annealing and doping for the thick films are investigated, and the effects of annealing and doping on morphology, crystalline phase, grain size, Seebeck coefficient, homogeneity, electrical conductivity, and power factor of the bismuth telluride thick films have been studied.

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“…In the charge process, because aluminum ions cannot be reduced to aluminum, the presence of aluminum ions can aid zinc to form nuclei and then deplete overgrowth of zinc grain, such as zinc moss and dendrites. 23,24 Then, in the discharge process, because Zn-Sn-Al-LDH is firstly formed and the relative molecular mass of formed Zn-Sn-Al-LDH is much higher than that of ZnO, the Van der Wals forces between Zn-Sn-Al-LDH and ZnO are greater. This makes ZnO particles easy to be deposited on or around the surface of the Zn-Sn-Al-LDH template.…”

Section: Resultsmentioning

confidence: 99%

Influences of Zn-Sn-Al-Hydrotalcite Additive on the Electrochemical Performances of ZnO for Zinc-Nickel Secondary Cells

Feng

Yang

Huang

et al. 2014

J. Electrochem. Soc.

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Zn-Sn-Al-LDH as a novel additive of ZnO electrode has been prepared through a simple hydrothermal process. The effects of novel additive on electrochemical performances of ZnO have been investigated by charge-discharge cycling test, cyclic voltammetry (CV), Tafel polarization tests and electrochemical impedance spectroscope (EIS) measurement. The Scanning electron microscopy (SEM) of ZnO electrodes after cycling show that Zn-Sn-Al-LDH as ZnO electrode additive can suppress the dendrite growth of ZnO, due to its special layer structure and better stability in alkaline electrolyte. Compared with the pure ZnO electrode, the ZnO electrodes added with Zn-Sn-Al-LDH additive, especially the ZnO electrode added with 24% Zn-Sn-Al-LDH additive, show better cycle performance. Meanwhile, the results of CVs exhibit better reversibility, the Tafel polarization curves reveal the better anti-corrosion property and the EIS show a lower charge-transfer resistance for the ZnO electrodes added with Zn-Sn-Al-LDH additive than those of pure ZnO electrode. Zn-Sn-Al-LDH with the special layered structure is a novel, high efficient additive of ZnO and can significantly improve electrochemical performances of ZnO.The zinc/nickel electrochemical system has long been proposed as a good candidate for secondary alkaline storage cells, due to its excellent performance, such as high practical specific energy, excellent specific power, high open-circuit-voltage, low cost and low toxicity. 1,2 These advantages make it has the potential to replace lead-acid batteries and nickel-cadmium batteries. 3 At present, the main anodic material of the Zn-Ni secondary battery is ZnO. But, due to the high solubility of ZnO in alkaline electrolyte, it is easy for ZnO to come into being zinc dendrite and shape change during the cycle process. 4-8 It leads to that the cycle performance of ZnO electrode is poor, which hinders widespread applications of Zn-Ni secondary batteries. 1,2,9 So far, many attempts have been made to improve the electrochemical performance of the ZnO electrode. ZnO with different morphologies have been synthesized and the effects of morphology on electrochemical performance have also been studied. 10-12 However, the effects of morphology on improving the electrochemical performance of the ZnO electrode are not very significant. In order to improve the electrochemical performance of Zn-Ni batteries, the additive which are added to the anode or the electrolyte have been paid more and more attentions. So far, various electrode additives including Ca(OH) 2 , 13 Bi 2 O 3 , 14 TiO 2 , 2 PbO, 15 SnO 2 16 etc. have been investigated to improve the electrochemical properties of zinc electrode. These additives play an important role in decreasing Zn compound solubility, suppressing H 2 formation, and enhancing electronic conductivity of zinc electrode. However, the cycle life of ZnO electrode is still poor. Thus, it is necessary to find an additive to further improve the cycle performance of the ZnO electrode.Layered double hydroxide (LDH), known as...

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The influence of Al substrate intermetallic precipitates on zinc electrodeposition

Cited by 15 publications

References 16 publications

Nucleation and Growth of Zinc Particles on an Aluminum Substrate in a Zincate Process

Nucleation and Growth of Zinc Particles on an Aluminum Substrate in a Zincate Process

Effects of Annealing and Doping on Nanostructured Bismuth Telluride Thick Films

Influences of Zn-Sn-Al-Hydrotalcite Additive on the Electrochemical Performances of ZnO for Zinc-Nickel Secondary Cells

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