Interaction of metallic materials with simulated kraft digester white liquor

Towards the electrochemical detection of sulphide

I. Betova, M. Bojinov (Corresponding Author), Outi Hyökyvirta, Timo Saario

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)

    Abstract

    The electrochemical behaviour of a range of metals (Pt, Pd, Ir, and Fe) as electrode materials in simulated kraft digester white liquor (a concentrated sodium hydroxide solution with or without the addition of sodium sulphide at 170 °C) has been compared by registering quasi-steady state current vs. potential curves, chronoamperometric responses at constant potential and impedance spectra. The results in the vicinity of the zero-current potential point to a two-step reaction with an adsorbed intermediate, possibly elemental sulphur, being rate limiting on the noble metals. At more positive potentials, a new process is detected on all the materials. According to relevant thermodynamic calculations, this process most probably corresponds to the oxidation of sulphide to polysulphide. Current densities measured on Pt and Fe in a wide potential range is linearly dependent on sulphide concentration. The associated chronoamperometric response is fast enough so that Pt can be regarded as a promising material for the electrochemical detection of sulphide in kraft digesters.
    Original languageEnglish
    Pages (from-to)52-59
    Number of pages7
    JournalJournal of Electroanalytical Chemistry
    Volume654
    Issue number1-2
    DOIs
    Publication statusPublished - 2011
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Sulfides
    Sodium Hydroxide
    Sodium
    Precious metals
    Sulfur
    Polysulfides
    Current density
    Metals
    Thermodynamics
    Oxidation
    Electrodes

    Keywords

    • Noble metal
    • Sodium sulphide
    • Kraft digester white liquor
    • Electrochemical impedance spectroscopy
    • Cyclic voltammetry

    Cite this

    @article{11d5b403143d4df496ae0d4e42ce9c49,
    title = "Interaction of metallic materials with simulated kraft digester white liquor: Towards the electrochemical detection of sulphide",
    abstract = "The electrochemical behaviour of a range of metals (Pt, Pd, Ir, and Fe) as electrode materials in simulated kraft digester white liquor (a concentrated sodium hydroxide solution with or without the addition of sodium sulphide at 170 °C) has been compared by registering quasi-steady state current vs. potential curves, chronoamperometric responses at constant potential and impedance spectra. The results in the vicinity of the zero-current potential point to a two-step reaction with an adsorbed intermediate, possibly elemental sulphur, being rate limiting on the noble metals. At more positive potentials, a new process is detected on all the materials. According to relevant thermodynamic calculations, this process most probably corresponds to the oxidation of sulphide to polysulphide. Current densities measured on Pt and Fe in a wide potential range is linearly dependent on sulphide concentration. The associated chronoamperometric response is fast enough so that Pt can be regarded as a promising material for the electrochemical detection of sulphide in kraft digesters.",
    keywords = "Noble metal, Sodium sulphide, Kraft digester white liquor, Electrochemical impedance spectroscopy, Cyclic voltammetry",
    author = "I. Betova and M. Bojinov and Outi Hy{\"o}kyvirta and Timo Saario",
    year = "2011",
    doi = "10.1016/j.jelechem.2011.01.032",
    language = "English",
    volume = "654",
    pages = "52--59",
    journal = "Journal of Electroanalytical Chemistry",
    issn = "1572-6657",
    publisher = "Elsevier",
    number = "1-2",

    }

    Interaction of metallic materials with simulated kraft digester white liquor : Towards the electrochemical detection of sulphide. / Betova, I.; Bojinov, M. (Corresponding Author); Hyökyvirta, Outi; Saario, Timo.

    In: Journal of Electroanalytical Chemistry, Vol. 654, No. 1-2, 2011, p. 52-59.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Interaction of metallic materials with simulated kraft digester white liquor

    T2 - Towards the electrochemical detection of sulphide

    AU - Betova, I.

    AU - Bojinov, M.

    AU - Hyökyvirta, Outi

    AU - Saario, Timo

    PY - 2011

    Y1 - 2011

    N2 - The electrochemical behaviour of a range of metals (Pt, Pd, Ir, and Fe) as electrode materials in simulated kraft digester white liquor (a concentrated sodium hydroxide solution with or without the addition of sodium sulphide at 170 °C) has been compared by registering quasi-steady state current vs. potential curves, chronoamperometric responses at constant potential and impedance spectra. The results in the vicinity of the zero-current potential point to a two-step reaction with an adsorbed intermediate, possibly elemental sulphur, being rate limiting on the noble metals. At more positive potentials, a new process is detected on all the materials. According to relevant thermodynamic calculations, this process most probably corresponds to the oxidation of sulphide to polysulphide. Current densities measured on Pt and Fe in a wide potential range is linearly dependent on sulphide concentration. The associated chronoamperometric response is fast enough so that Pt can be regarded as a promising material for the electrochemical detection of sulphide in kraft digesters.

    AB - The electrochemical behaviour of a range of metals (Pt, Pd, Ir, and Fe) as electrode materials in simulated kraft digester white liquor (a concentrated sodium hydroxide solution with or without the addition of sodium sulphide at 170 °C) has been compared by registering quasi-steady state current vs. potential curves, chronoamperometric responses at constant potential and impedance spectra. The results in the vicinity of the zero-current potential point to a two-step reaction with an adsorbed intermediate, possibly elemental sulphur, being rate limiting on the noble metals. At more positive potentials, a new process is detected on all the materials. According to relevant thermodynamic calculations, this process most probably corresponds to the oxidation of sulphide to polysulphide. Current densities measured on Pt and Fe in a wide potential range is linearly dependent on sulphide concentration. The associated chronoamperometric response is fast enough so that Pt can be regarded as a promising material for the electrochemical detection of sulphide in kraft digesters.

    KW - Noble metal

    KW - Sodium sulphide

    KW - Kraft digester white liquor

    KW - Electrochemical impedance spectroscopy

    KW - Cyclic voltammetry

    U2 - 10.1016/j.jelechem.2011.01.032

    DO - 10.1016/j.jelechem.2011.01.032

    M3 - Article

    VL - 654

    SP - 52

    EP - 59

    JO - Journal of Electroanalytical Chemistry

    JF - Journal of Electroanalytical Chemistry

    SN - 1572-6657

    IS - 1-2

    ER -