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Nanostructured Pd hydride microelectrodes:In situ monitoring of pH variations in a porous medium


Reference:

Serrapede, M., Pesce, G. L., Ball, R. J. and Denuault, G., 2014. Nanostructured Pd hydride microelectrodes:In situ monitoring of pH variations in a porous medium. Analytical Chemistry, 86 (12), pp. 5758-5765.

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    Official URL:

    http://dx.doi.org/10.1021/ac500310j

    Abstract

    In this study we report the exceptional potentiometric properties of pH microprobes made with nanostructured palladium hydride microelectrodes and demonstrate their application by monitoring pH variations resulting from a reaction confined in a porous medium. Their potentiometric response was found to be reproducible and stable over several hours but primarily Nernstian over a remarkably wide pH range, including alkaline conditions up to pH 14. Continuous operation was demonstrated by reloading hydrogen at regular intervals to maintain the correct hydride composition thereby alleviating the need for calibration. These properties were validated by detecting pH transients during the carbonation of Ca(OH)2 within a fibrous mesh. Experimental pHs recorded in situ were in excellent agreement with theoretical calculations for the Co2 partial pressures considered. Results also showed that the electrodes were sufficiently sensitive to differentiate between the formation of vaterite and calcite, two polymorphs of CaCO3. These nanostructured microelectrodes are uniquely suited to the determination of pH in highly alkaline solutions, particularly those arising from interfacial reactions at solid and porous surfaces and are thus highly appropriate as pH sensing tips in scanning electrochemical microscopy.

    Details

    Item Type Articles
    CreatorsSerrapede, M., Pesce, G. L., Ball, R. J. and Denuault, G.
    DOI10.1021/ac500310j
    DepartmentsFaculty of Engineering & Design > Architecture & Civil Engineering
    Research CentresBRE Centre in Innovative Construction Materials
    Materials Research Centre
    Publisher StatementPublished_version.pdf: Reprinted with permission from Anal. Chem., 2014, 86 (12), pp 5758–5765. Copyright 2014 American Chemical Society.
    RefereedYes
    StatusPublished
    ID Code39866

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