A progressive nucleation mechanism enables stable zinc stripping–plating behavior

2021 ◽  
Vol 14 (10) ◽  
pp. 5563-5571
Author(s):  
Yihu Li ◽  
Pengfei Wu ◽  
Wei Zhong ◽  
Chunlin Xie ◽  
Yanling Xie ◽  
...  
Keyword(s):  
Nucleation Mechanism ◽  
Preferential Adsorption ◽  
Instantaneous Nucleation ◽  
Progressive Nucleation

The preferential adsorption of cation additives enables the transformation of a zinc nucleation mechanism from instantaneous nucleation to progressive nucleation, which ultimately realizes a stable zinc stripping/plating behavior.

Kinetics of Ni-Nano Cr2O3 Composite Coating during Early Electro-Crystallization Processes

2013 ◽  
Vol 785-786 ◽  
pp. 938-943 ◽  
Author(s):  
Li Bin Yu ◽  
Qi Jun Zhong ◽  
Yi Xiao ◽  
Jian Feng Gu ◽  
Qing Dong Zhong
Keyword(s):  
Composite Coating ◽  
Composite System ◽  
Nucleation Mechanism ◽  
Crystal Nucleation ◽  
Nucleation Process ◽  
Nucleation Kinetics ◽  
Instantaneous Nucleation ◽  
Nucleation Model ◽  
Progressive Nucleation ◽  
Kinetics Of

Nucleation kinetics of Ni-nanoCr2O3composite coating during early electro-crystallization was investigated. The results showed that, the early electro-crystallization processes of Ni-nanoCr2O3composite coating and pure Ni coating followed a Scharifker-Hill nucleation/growth mechanism. At the low potential, the nucleation process of pure Ni and Ni-Cr2O3composite system may approach to the progressive nucleation model; With the overpotential increasing, the nucleation model of Pure Ni and Ni-Cr2O3composite system converts into the instantaneous nucleation mechanism controlled; at the same overpotential, Cr2O3powder promotes the electro-crystallization nucleation of Ni. But at high negative potential, Cr2O3powder in composite system promotes the electro-crystal nucleation of Ni weakly; the nanoCr2O3powder added reduces the current efficiency in the nucleation process of Ni.

Influence of Additive on Morphology and Nucleation Mechanism for Zn-Electrodeposition

2014 ◽  
Vol 941-944 ◽  
pp. 1654-1658
Author(s):  
Dao Bing Huang ◽  
Yuan Qiang Tu ◽  
Jie Cai ◽  
Guan Wen Feng ◽  
Xing Peng Guo
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Steel Sheet ◽  
Electrochemical Techniques ◽  
Nucleation Mechanism ◽  
Sem Images ◽  
Sodium Dodecylbenzenesulfonate ◽  
Zinc Electrodeposition ◽  
Instantaneous Nucleation ◽  
Scanning Electron

In this study, the influence of sodium dodecylbenzenesulfonate (SDBS) as additive on the morphology and nucleation mechanism for zinc electrodeposition on steel sheet was investigated using scanning electron microscopy (SEM) and potentiostatic electrochemical techniques. From the analysis of the chronoamperometric transients and the SEM images, an instantaneous nucleation with 3D growth has been proposed in both baths with and without SDBS. It was found that the morphology of zinc electrodeposits varied from initial thin-layered hexagonal plates to a finer ridge and needle morphologies with increasing the overpotential as SDBS was added in the bath solution.

scholarly journals Study of the influence of surface-active substances on the initial stage of copper electrodeposition

2017 ◽  
pp. 12-19 ◽  
Author(s):  
Amantay Dalbanbay ◽  
Aleksandr Nefedov ◽  
Roza Nurmanova ◽  
Mikhail Nauryzbayev
Keyword(s):  
Copper Ions ◽  
Three Dimensional ◽  
Copper Electrodeposition ◽  
Peak Current ◽  
Current Decay ◽  
Preferential Adsorption ◽  
Initial Stage ◽  
Instantaneous Nucleation ◽  
Surface Active ◽  
Active Substances

In this research, the effect of surface-active substances (CMC and DFP) on the electrolysis of copper by cyclic voltammetry (CVA) and chronoamperometric methods was studied. The working electrode was a glassy carbon electrode. Studies show that in the acid solution of copper sulfate (10-2 M CuSO4 + 0.5 M H2SO4), the three-dimensional electrochemical deposition of copper occurs by the mechanism of instantaneous nucleation. The added surface active substances affect the dischargeionization process, the standard electroreduction potential is shifted to the negative side. The added DFP reduces the cathodic peak current, and the addition of CMC results in its increase. At the deposition potentials corresponding to the regions up to the CVA peak current (here, still, the mixed electrodeposition kinetics), the number of nuclei formed is greater for a pure solution, but at current decay potentials, where the diffusion regime takes place, the nuclei population density (NPD) is higher for solutions with surfactants. The most powerful effect here is caused by the addition of DFP. In the case of mixed additives, the NPD values are close to those of the CMC, obviously indicating the preferential adsorption of CMC, whereas the DFP as complexes with copper ions is closer to the near-electrode region.

scholarly journals Effect of Electrosynthesis Potential on Nucleation, Growth, Adhesion, and Electronic Properties of Polypyrrole Thin Films on Fluorine-Doped Tin Oxide (FTO)

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2419
Author(s):  
Jhon Puerres ◽  
Pablo Ortiz ◽  
María T. Cortés
Keyword(s):  
Thin Film ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Energy Levels ◽  
Current Time ◽  
Instantaneous Nucleation ◽  
High Control ◽  
Progressive Nucleation ◽  
First Time ◽  
Nucleation And Growth Mechanism

Polypyrrole (PPy) is one of the most attractive conducting polymers for thin film applications due to its good electrical conductivity, stability, optical properties, and biocompatibility. Among the technologies in which PPy has gained prominence are optoelectronics and solar energy conversion, where transparent electrodes such as fluorine-doped tin oxide (FTO) or indium tin oxide (ITO) are frequently used. However, FTO substrates have the notable advantage that their components are widely available in nature, unlike those of ITO. Recognizing the importance that the FTO/polypyrrole system has gained in various applications, here, we studied for the first time the nucleation and growth mechanism of electro-synthesized PPy on FTO. Additionally, the effect of the synthesis potential (0.9, 1.0, 1.1, and 1.2 V vs. Ag/AgCl) on the homogeneity, adhesion, conductivity, and HOMO energy levels of PPy films was determined. From current–time transients and scanning electron microscopy, it was found that films synthesized at 0.9 and 1.0 V exhibit 3D growth with progressive nucleation (as well as lower homogeneity and higher adhesion to FTO). In contrast, films synthesized at 1.1 and 1.2 V follow 2D growth with instantaneous nucleation. It was also evident that increasing the polymerization potential leads to polymers with lower conductivity and more negative HOMO levels (versus vacuum). These findings are relevant to encourage the use of electro-synthesized PPy in thin film applications that require a high control of material properties.

ELECTRODEPOSITION OF CuZn ALLOYS FROM THE NON-CYANIDE ALKALINE BATHS

2015 ◽  
Vol 22 (01) ◽  
pp. 1550003 ◽  
Author(s):  
MINGGANG LI ◽  
GUOYING WEI ◽  
SHUANGSHUANG HU ◽  
SHUHAN XU ◽  
YEJIONG YANG ◽  
...  
Keyword(s):  
Copper Sulfate ◽  
Nucleation Process ◽  
X Ray Diffraction ◽  
Sheet Iron ◽  
Instantaneous Nucleation ◽  
Cuzn Alloy ◽  
Effect Of Copper ◽  
Alkaline Baths ◽  
Progressive Nucleation ◽  
Crystal Particle

Effect of copper sulfate on CuZn alloys electroplating from non-cyanide baths are investigated by different electrochemical methods. Cyclic voltammetry and current transient measurements are used to characterize the CuZn alloys electroplating system in order to analyze the nucleation and growth mechanism. The reduction of Cu and CuZn alloy on sheet iron substrates shows an instantaneous nucleation process. However, the reduction of Zn on sheet iron substrates shows a progressive nucleation process. The structure and surface morphology of CuZn alloys are analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The morphology of CuZn alloys obtained with 50 g L-1 copper sulfate presents a smooth and compact deposit and the size of crystal particle is uniform.

Study of Substrate for the Zinc Electrode in Acid Zn-PbO2 Flow Battery

2014 ◽  
Vol 700 ◽  
pp. 136-140
Author(s):  
Han Min Liu ◽  
Jie Cheng ◽  
Yue Hua Wen ◽  
Jun Li Pan ◽  
Gao Ping Cao
Keyword(s):  
Hydrogen Evolution ◽  
Zinc Electrode ◽  
Zinc Deposition ◽  
Graphite Composite ◽  
Metallic Lead ◽  
Instantaneous Nucleation ◽  
Lead Alloys ◽  
Zinc Corrosion ◽  
Progressive Nucleation ◽  
Current Transients

An investigation into the suitability of carbon materials, metallic lead and its alloys as substrates for the zinc electrode in acid Zn-PbO2 flow batteries was performed. No maximum current appears on the potentiostatic current transients recorded for the zinc deposition on the lead and its alloys. With increasing the overpotential, the progressive nucleation turns to be the 3D-instantaneous nucleation process employed for the resin-graphite composite. Hydrogen evolution on the graphite composite is effectively suppressed due to the doping of polymer resins. The rate of hydrogen evolution reaction on the lead is relatively weak, but on the lead alloys, the hydrogen evolution conversely becomes serious to a certain degree. Though the exchange current density of the zinc deposition and dissolution process on the graphite composite is relatively low, the zinc corrosion is weakened to a great extent. With the increase of deposition time, the zinc deposits tend to be more compact. Zinc galvanostatic charge-discharge cycling on the graphite composite reveals that the coulombic of over 90% can be found, exhibiting an excellent cycling stability.

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