An alternative approach to ascertain the rate-determining steps of TiO 2 photoelectrocatalytic reaction by electrochemical impedance spectroscopy

H. Liu, X. Z. Li, Yongjun Leng, W. Z. Li

    Research output: Contribution to journalArticle

    61 Citations (Scopus)

    Abstract

    In an attempt to ascertain the rate-determining steps (RDS) of TiO 2 photoelectrocatalytic (PEC) reaction, the PEC oxidation of sulfosalicyclic acid (SSA) solution in a TiO 2 -coated electrode reactor system was monitored by applying the electrochemical impedance spectroscopy (EIS) method. In the meantime, an EIS mathematical model was first established to theoretically simulate the PEC reaction. Based on the EIS model, the theoretical simulation indicates three typical reactions in a PEC oxidation process, which include the charge-transfer-dominated reaction, both the charge-transfer- and adsorption-dominated reaction, and the adsorption-dominated reaction. The experimental results of EIS measurement showed that there was only one arc/semicircle on the EIS plane display when the external bias applied was below 200 mV (vs SCE) in the SSA PEC degradation whereas there were two arcs/semicircles when the externally applied bias exceeded 200 mV (vs SCE). The experimental results have a good agreement with the model simulation. The EIS method in this study provide an easier way to determine the RDS in a PEC oxidation process, which would be helpful to better control the reaction in practice.

    Original languageEnglish (US)
    Pages (from-to)8988-8996
    Number of pages9
    JournalJournal of Physical Chemistry B
    Volume107
    Issue number34
    StatePublished - Aug 28 2003

    Fingerprint

    Electrochemical impedance spectroscopy
    impedance
    spectroscopy
    Oxidation
    Charge transfer
    oxidation
    arcs
    Adsorption
    charge transfer
    Acids
    acids
    adsorption
    Display devices
    mathematical models
    Mathematical models
    simulation
    Degradation
    reactors
    Electrodes
    degradation

    All Science Journal Classification (ASJC) codes

    • Physical and Theoretical Chemistry
    • Surfaces, Coatings and Films
    • Materials Chemistry

    Cite this

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    abstract = "In an attempt to ascertain the rate-determining steps (RDS) of TiO 2 photoelectrocatalytic (PEC) reaction, the PEC oxidation of sulfosalicyclic acid (SSA) solution in a TiO 2 -coated electrode reactor system was monitored by applying the electrochemical impedance spectroscopy (EIS) method. In the meantime, an EIS mathematical model was first established to theoretically simulate the PEC reaction. Based on the EIS model, the theoretical simulation indicates three typical reactions in a PEC oxidation process, which include the charge-transfer-dominated reaction, both the charge-transfer- and adsorption-dominated reaction, and the adsorption-dominated reaction. The experimental results of EIS measurement showed that there was only one arc/semicircle on the EIS plane display when the external bias applied was below 200 mV (vs SCE) in the SSA PEC degradation whereas there were two arcs/semicircles when the externally applied bias exceeded 200 mV (vs SCE). The experimental results have a good agreement with the model simulation. The EIS method in this study provide an easier way to determine the RDS in a PEC oxidation process, which would be helpful to better control the reaction in practice.",
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    An alternative approach to ascertain the rate-determining steps of TiO 2 photoelectrocatalytic reaction by electrochemical impedance spectroscopy . / Liu, H.; Li, X. Z.; Leng, Yongjun; Li, W. Z.

    In: Journal of Physical Chemistry B, Vol. 107, No. 34, 28.08.2003, p. 8988-8996.

    Research output: Contribution to journalArticle

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    AU - Liu, H.

    AU - Li, X. Z.

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    AU - Li, W. Z.

    PY - 2003/8/28

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