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

SENSORS AND ACTUATORS B-CHEMICAL

卷:236

Article

Abbas, Y.¹  Zhu, X.¹  de Boer, H. L.¹  Tanvir, N. B.²  Olthuis, W.¹  van den Berg, A.¹ 

[1] Univ Twente, MESA Inst Nanotechnol, MIRA Biomed Technol & Tech Med, BIOS Lab Chip Grp, NL-7500 AE Enschede, Netherlands

[2] Univ Freiburg, IMTEK FMF, Stefan Meier Str 21, D-79104 Freiburg, Germany

关键词: Chloride ion detection;    Kelvin probe;    Contactless measurement;    Potentiometric measurement;    Silver-silver chloride electrode;   

DOI  :  10.1016/j.snb.2016.06.150

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free