Potentiometric measurement with a Kelvin probe: Contactless measurement of chloride ions in aqueous electrolyte

Y. Abbas*, X. Zhu, H.L. de Boer, N.B. Tanvir, W. Olthuis, A. van den Berg

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)
82 Downloads (Pure)

Abstract

For the first time the chloride ion concentration in electrolyte is measured using a Kelvin probe. A silver-silver chloride (Ag/AgCl) electrode, which is a chloride ion selective electrode, is used as a sample plate in the electrolyte and the Kelvin probe is used as a reference plate that is vibrating above the electrolyte. The open-circuit potential (OCP) of the Ag/AgCl electrode is a function of the Cl concentration. The contact potential difference (CPD), measured by the Kelvin probe, gives the OCP of the Ag/AgCl electrode. The measurement does not require any contact between the reference plate and the electrolyte. This approach opens the possibilities for using a Kelvin probe as a contactless reference electrode in electrochemical measurements, such as potentiometry.

Original languageEnglish
Pages (from-to)1126-1132
Number of pages7
JournalSensors and Actuators B: Chemical
Volume236
DOIs
Publication statusPublished - 29 Nov 2016

Keywords

  • Chloride ion detection
  • Contactless measurement
  • Kelvin probe
  • Potentiometric measurement
  • Silver-silver chloride electrode
  • 2023 OA procedure

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