Hydrogel-based flexible micro-reference electrodes for use in alkaline and neutral pH solutionsReport as inadecuate

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Journal of Solid State Electrochemistry

, Volume 20, Issue 10, pp 2749–2757

First Online: 13 June 2016Received: 10 May 2016Revised: 16 May 2016Accepted: 18 May 2016


Two types of nonbreakable, flexible micro-reference electrodes filled with gel-electrolytes were prepared for use in solutions with alkaline and neutral pH. The electrodes are intended for electrochemical measurements, in which chloride-free conditions are important. Due to the flexible, bendable construction of the electrodes, electrochemical experiments at locations difficult to access with common reference electrodes are enabled. Hg|HgO-type electrodes were prepared from amalgamated Au wires, followed by oxidation of the amalgam, which is mounted in a PTFE tube filled with 0.1M NaOH solution immobilized in a PAA-g-PEO gel. The potential of this type of electrode was found to be 0.162 ± 0.002 V SHE at room temperature. Cu|CuSO4 electrodes, consisting of a Cu wire immersed in a saturated CuSO4 solution jellied with gelatin, showed a stable open-circuit potential of 0.312 ± 0.001 V SHE. Further characterization of the electrodes was performed in terms of electrochemical impedance spectroscopy and micro-polarization measurements. As an alternative to the flexible electrodes, rigid electrodes in glass enclosure were fabricated in analogy to the flexible-type electrodes.

KeywordsReference electrodes Microelectrodes Flexible Chloride-free Gabriela Schimo and Carina Daniela Grill contributed equally to this work.

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Author: Gabriela Schimo - Carina Daniela Grill - Jan Philipp Kollender - Achim Walter Hassel

Source: https://link.springer.com/

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