Complex Coordination Silver Electrocrystallization Mechanism on Glassy Carbon Electrode Surface

Authors

Shuai-shuai HUANG, State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Cheng LIU, State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Lei JIN, State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Fang-zu YANG, State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;Follow
Zhong-qun TIAN, State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Shao-min. ZHOU, State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;

Corresponding Author

Fang-zu YANG(fzyang@xmu.edu.cn)

Abstract

Cyclic voltammetry and potential step methods were successfully used to study the electrochemical crystallization mechanism of silver deposition on glassy carbon electrode (GCE) in the practical cyanide-free silver plating electrolyte containing composite complexing agents. Scharifker-Hill (SH) theory was used to fitting the experimental data. The results showed that the electrodeposition of silver is a diffusion controlled irreversible electrode process according to three-dimensional instantaneous nucleation mechanism. When the step potential shifted from -750 mV to -825 mV, the peak deposition current Im was increased, while the induced nucleation time tm shortened. The calculated kinetic parameters showed that the diffusion coefficient (D) was basically constant, ranged (7.31 ±0.34) ×10-5 cm²·s^-1, and the active nucleation sites density (N₀) increased from 3.26 ±105 cm^-2 to 10.2±105 cm^-2. The morphologies for the initial deposition of Ag verified the three-dimensional instantaneous nucleation mechanism. Increasing the temperature could significantly improve the diffusion ability of the active silver coordination ions in the electrolyte, which shortened the nucleation time and enhanced the active nucleation sites density N₀.

Graphical Abstract

Keywords

silver, complex coordination, cyanide-free system, nucleation mechanism, cyclic voltammetry, chronoamperometric curves

DOI Link

https://doi.org/10.13208/j.electrochem.180105

Publication Date

2018-08-28

Online Available Date

2018-04-04

Revised Date

2018-03-12

Received Date

2018-01-05

Recommended Citation

Shuai-shuai HUANG, Cheng LIU, Lei JIN, Fang-zu YANG, Zhong-qun TIAN, Shao-min. ZHOU. Complex Coordination Silver Electrocrystallization Mechanism on Glassy Carbon Electrode Surface[J]. Journal of Electrochemistry, 2018 , 24(4): 344-350.
DOI: 10.13208/j.electrochem.180105
Available at: https://jelectrochem.xmu.edu.cn/journal/vol24/iss4/5