Closed bipolar electrode system for a liquid-junction-free reference electrode integrated in an amperometric probe sensor

Siti Masturah binti Fakhruddin, Kumi Y. Inoue, Ryoto Tsuga, Tomokazu Matsue

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Reference electrodes (REs) play an essential role in electrochemical measurements. REs require liquid junctions to allow for ion conductivity between the RE and the sample solution. However, a liquid junction causes unwanted ion leakage into the analyte and clogging inducing reference potential inaccuracy. In this study, we report a liquid-junction-free amperometric probe sensor with an integrated RE, based on a closed bipolar electrode (cBPE) system. The liquid junction of the RE was replaced by the cBPE, which provides electrical conductivity instead of ionic conductivity between the inner solution of the RE and the sample solution. Since the solutions were in two separate cells, undesired contamination was completely prevented. We successfully conducted voltammetric and amperometric quantitative detection of 0.1–0.5 mM ferrocenemethanol using this system. Although its uses are limited, the present probe sensor with integrated liquid-junction-free reference electrode provides a feasible alternative for amperometric electrochemical measurements.

Original languageEnglish
Pages (from-to)62-65
Number of pages4
JournalElectrochemistry Communications
Volume93
DOIs
Publication statusPublished - 2018 Aug

Keywords

  • Amperometry
  • Bipolar electrode
  • Liquid junction
  • Probe sensor
  • Reference electrode

ASJC Scopus subject areas

  • Electrochemistry

Fingerprint Dive into the research topics of 'Closed bipolar electrode system for a liquid-junction-free reference electrode integrated in an amperometric probe sensor'. Together they form a unique fingerprint.

Cite this