Print Email Facebook Twitter Microstructure, surface chemistry and electrochemical response of Ag|AgCl sensors in alkaline media Title Microstructure, surface chemistry and electrochemical response of Ag|AgCl sensors in alkaline media Author Pargar, F. (TU Delft Materials and Environment) Kolev, H (Bulgarian Academy of Sciences) Koleva, D.A. (TU Delft Materials and Environment) van Breugel, K. (TU Delft Materials and Environment) Date 2018 Abstract Characterization of the Ag/AgCl electrode is a necessary step toward itsapplication as a chloride sensor in a highly alkaline medium, such as concrete.The nucleation and growth of AgCl on Ag in 0.1 M HCl was verified throughcyclic voltammetry. Ag anodization was performed at current densities, determinedby potentiodynamic polarization in the same (0.1 M HCl) medium. Themorphology and microstructure of the AgCl layers were evaluated via electronmicroscopy, while surface chemistry was studied through energy-dispersivespectroscopy and X-ray photoelectron spectroscopy. At current density above2 mA/cm2, the thickness and heterogeneity of the AgCl layer increased. In thiscondition, small AgCl particles formed in the immediate vicinity of the Agsubstrate, subsequently weakening the bond strength of the Ag/AgCl interface.Silver oxide-based or carbon-based impurities were present on the surface of thesensor in amounts proportional to the thickness and heterogeneity of the AgCllayer. It is concluded that a well-defined link exists between the properties of theAgCl layer, the applied current density and the recorded overpotential duringAg anodization. The results can be used as a recommendation for preparation ofchloride sensors with stable performance in cementitious materials. To reference this document use: http://resolver.tudelft.nl/uuid:c4fdf3f1-87e8-4b22-a309-4ef677c0f235 DOI https://doi.org/10.1007/s10853-018-2083-0 ISSN 0022-2461 Source Journal of Materials Science, 53 (10), 7527–7550 Part of collection Institutional Repository Document type journal article Rights © 2018 F. Pargar, H Kolev, D.A. Koleva, K. van Breugel Files PDF 10.1007_2Fs10853_018_2083_0.pdf 2.62 MB Close viewer /islandora/object/uuid:c4fdf3f1-87e8-4b22-a309-4ef677c0f235/datastream/OBJ/view