The Role of the Electrolyte in the Fabrication of Ag vertical bar AgCl Reference Electrodes for pH Measurement

摘要

Ag vertical bar AgCl reference electrodes have been prepared by anodising silver under constant potential in an aqueous electrolyte containing the chloride salt of three different alkali metals. These have been compared to Ag vertical bar AgCl reference electrodes anodised in hydrogen chloride that are conventionally used. Our research reveals that the size of the alkali metal cation has an influence on the Ag vertical bar AgCl electrode microstructure, with smaller cations resulting in a more porous material and improved electrode stability. This research has positive implications for improving the performance of Ag vertical bar AgCl reference electrodes for pH measurement. (C) 2015 Elsevier Ltd. All rights reserved.