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Issue 10, 2014
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Voltammetric pH sensor based on an edge plane pyrolytic graphite electrode

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Abstract

A simple sensor for pH determination is reported using unmodified edge plane pyrolytic graphite (EPPG) electrodes. The analysis is based on the electro-reduction of surface quinone groups on the EPPG which was characterised using cyclic voltammetry (CV) and optimised with square-wave voltammetry (SWV). Under optimised conditions, a linear response is observed between the peak potential and pH with a gradient of ∼59 mV per pH (at 25 °C), which corresponds well with Nernstian behaviour based on a 2 proton, 2 electron system over the aqueous pH range 1.0 to 13.0. As such, an EPPG is suggested as a reagent free and robust pH sensing material.

Graphical abstract: Voltammetric pH sensor based on an edge plane pyrolytic graphite electrode

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Publication details

The article was received on 20 Jan 2014, accepted on 23 Mar 2014 and first published on 27 Mar 2014


Article type: Paper
DOI: 10.1039/C4AN00147H
Author version available: Download Author version (PDF)
Citation: Analyst, 2014,139, 2397-2403
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    Voltammetric pH sensor based on an edge plane pyrolytic graphite electrode

    M. Lu and R. G. Compton, Analyst, 2014, 139, 2397
    DOI: 10.1039/C4AN00147H

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