Nucleation mechanism of silver during electrodeposition on a glassy carbon electrode from a cyanide-free bath with 2-hydroxypyridine as a complexing agent

作者：Lin Zhi Bin; Xie Bu Gao; Chen Jin Shui; Sun Jian Jun^*; Chen Guo Nan

来源：Journal of Electroanalytical Chemistry, 2009, 633(1): 207-211.

DOI：10.1016/j.jelechem.2009.05.015

• Silver
• Nucleation
• 2-Hydroxypyridine
• Polyethyleneimine
• Mechanism

The initial stage of silver electrodeposition on a glassy carbon electrode from a cyanide-free bath with 2-hydroxypyridine (2-HP) as the complexing agent is studied. The influence of polyethyleneimine (PEI) as an additive on the nucleation and growth of silver are also examined. Progressive nucleation mechanism is found for silver deposition according to Scharifker-Hills' model with three-dimensional diffusion-controlled growth nucleation. This mechanism cannot be influenced by adding PEI. However. the diffusion coefficient of the silver-2-HP complexes and the density of nuclei exhibit a remarkable decrease with the addition of PEI. Smoother and brighter silver deposits with progressive nucleation features were obtained in the presence of PEI from the images of scanning electron microscopy.

• 出版日期2009-8-1
• 单位福州大学