In-situ characterisation of the oxidation of Ni in ultrasupercritical water

Iva Betova, Martin Bojinov (Corresponding Author), Petri Kinnunen, Viivi Lehtovuori, Seppo Peltonen, Sami Penttilä, Timo Saario

    Research output: Contribution to journalArticleScientificpeer-review

    5 Citations (Scopus)

    Abstract

    In the present paper, in situ electrical and electrochemical measurements during oxidation of pure Ni in ultrasupercritical water (500–600 °C) have been performed and analysed. The onset of oxidation was followed using contact electric resistance measurements. The impedance spectra of the Ni–Ni contact during oxidation could be quantitatively interpreted using general considerations of the corrosion process and the Mixed-Conduction Model for oxide films. Preliminary estimates of the diffusion coefficients of principal ionic and electronic current carriers have been obtained and their relevance with respect to available data on Ni oxidation is discussed.
    Original languageEnglish
    Pages (from-to)311-316
    Number of pages6
    JournalElectrochemistry Communications
    Volume8
    Issue number2
    DOIs
    Publication statusPublished - 2006
    MoE publication typeA1 Journal article-refereed

    Keywords

    • nickel
    • oxidation
    • supercritical water
    • impedance spetroscopy
    • diffusion coefficient

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