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    Non-Ideal Cyclic Voltammetry of Redox Monolayers on Silicon Electrodes: Peak Splitting is Caused by Heterogeneous Photocurrents and Not by Molecular Disorder

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    Access Status
    Open access
    Authors
    Zhang, S.
    Lyu, X.
    Hurtado Torres, C.
    Darwish, Nadim
    Ciampi, Simone
    Date
    2022
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Zhang, S. and Lyu, X. and Hurtado Torres, C. and Darwish, N. and Ciampi, S. 2022. Non-Ideal Cyclic Voltammetry of Redox Monolayers on Silicon Electrodes: Peak Splitting is Caused by Heterogeneous Photocurrents and Not by Molecular Disorder. Langmuir. 38 (2): pp. 743-750.
    Source Title
    Langmuir
    DOI
    10.1021/acs.langmuir.1c02723
    ISSN
    0743-7463
    Faculty
    Faculty of Science and Engineering
    School
    School of Molecular and Life Sciences (MLS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP190100735
    http://purl.org/au-research/grants/arc/FT190100148
    URI
    http://hdl.handle.net/20.500.11937/91725
    Collection
    • Curtin Research Publications
    Abstract

    Over the last three decades, research on redox-active monolayers has consolidated their importance as advanced functional material. For widespread monolayer systems, such as alkanethiols on gold, non-ideal multiple peaks in cyclic voltammetry are generally taken as indication of heterogeneous intermolecular interactions-namely, disorder in the monolayer. Our findings show that, contrary to metals, peak multiplicity of silicon photoelectrodes is not diagnostic of heterogeneous intermolecular microenvironments but is more likely caused by photocurrent being heterogeneous across the monolayer. This work is an important step toward understanding the cause of electrochemical non-idealities in semiconductor electrodes so that these can be prevented and the redox behavior of molecular monolayers, as photocatalytic systems, can be optimized.

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