Relationship between microstructure of AgCl film and electrochemical behavior of Ag|AgCl electrode for chloride detection. (15th May 2021)

• Record Type: Journal Article
• Authors: Zhang, Zhangmin; Hu, Jie; Wang, Yangyang; Shi, Ruichao; Ma, Yuwei; Huang, Haoliang; Wang, Hao; Wei, Jiangxiong; Yu, Qijun
• Is Part Of: Corrosion science. Volume 184(2021)
• Publication Date: 2021-05-15
• Subjects: A. Concrete -- B. SEM -- B. XRD -- B. EIS -- C. Electrodeposited films; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109393
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: The growth of AgCl film was in layer-by-layer mode during electrochemical deposition. Micro channels mainly existed in the outer layer of AgCl film. The higher current density led to short diffusion path and lower ρr of AgCl film. Porous AgCl film resulted in smaller Rct of Ag/AgCl electrode. Abstract: The electrochemical behavior of Ag|AgCl electrode for chloride detection is closely related to the microstructure of AgCl film on the electrode surface. In this study, the surface properties and electrochemical behavior of Ag|AgCl electrode prepared with different current density were investigated. With a higher current density, the distance for ions diffusion through the boundaries of AgCl grains was reduced, due to the tended growth of AgCl at crystal plane (111) and formation of more spherical AgCl grains and porous AgCl film. As a result, both the electrical resistivity of AgCl film and Rct of Ag|AgCl electrode decreased.