Transient nanobubbles in short-time electrolysis

Vitaly Svetovoy, Remco G.P. Sanders, Michael Curt Elwenspoek

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    Abstract

    Water electrolysis in a microsystem is observed and analyzed on a short-time scale of ∼10 μs. The very unusual properties of the process are stressed. An extremely high current density is observed because the process is not limited by the diffusion of electroactive species. The high current is accompanied by a high relative supersaturation, S > 1000, that results in homogeneous nucleation of bubbles. On the short-time scale only nanobubbles can be formed. These nanobubbles densely cover the electrodes and aggregate at a later time to microbubbles. The effect is significantly intensified with a small increase of temperature. Application of alternating polarity voltage pulses produces bubbles containing a mixture of hydrogen and oxygen. Spontaneous reaction between gases is observed for stoichiometric bubbles with sizes smaller than ∼150 nm. Such bubbles disintegrate violently affecting the surfaces of the electrodes.
    Original languageUndefined
    Pages (from-to)184002
    Number of pages12
    JournalJournal of physics: Condensed matter
    Volume25
    Issue number18
    DOIs
    Publication statusPublished - 2013

    Keywords

    • EWI-24526
    • IR-89491
    • METIS-302730

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