Citation: XU Shuang-Quan, LIU Chun-Xia, SHEN Qing-Feng, ZHANG Tao, NI Yuan, YU Xiao-Hua. Electrodeposition Mechanism of Zn (Ⅱ) on Zinc Electrode[J]. Chinese Journal of Inorganic Chemistry, ;2016, 32(3): 386-392. doi: 10.11862/CJIC.2016.061 shu

Electrodeposition Mechanism of Zn (Ⅱ) on Zinc Electrode

1.
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
2.
Analysis and Test Center, Kunming University of Science and Technology, Kunming 650093, China

Received Date: 14 October 2015
Revised Date: 19 January 2016

Figures(7)

Reaction method of Zn²⁺ on the zinc electrode was researched by cyclic voltammetry (CV). Nucleation mode with Zn²⁺ was studied by chronoammperometry (CA) and impedance′s behavior of the Zn²⁺ in the different overpotential deposition periods was investigated by electrochemical impedance spectroscopy (EIS) in Zn (Ⅱ)-NH₄Cl quasi neutral system. The results showed that the electrodeposition of Zn²⁺ is an irreversible electrode reactions and conducts by continuous two steps of single electron in which the first step is controlled by speed. The electron transfer coefficient of electrode reaction is related to the surface of zinc electrode structure. Under the condition of constant potential, the crystallization of Zn²⁺ is approximate to three-dimensional instantaneous nucleation on zinc electrode in this system. Depositing of Zn²⁺ has experienced the process of covering, adsorption film and the formation of large number of nucleation. The process was controlled by electrochemical polarization firstly and then the electrochemical polarization-concentration polarization mixed control with the control potential negatively shifted. Finally the mechanism of electrodeposition process with Zn²⁺ on the zinc electrode was given.
- Zn (Ⅱ)-NH₄Cl quasi neutral system,
- electrodeposition,
- cyclic voltammetry,
- chronoammperometry,
- electrochemical impedance spectroscopy
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1.
沈阳化工大学材料科学与工程学院沈阳 110142