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    Absence of a Relationship between Surface Conductivity and Electrochemical Rates: Redox-Active Monolayers on Si(211), Si(111), and Si(110)

    90297.pdf (642.2Kb)
    Access Status
    Open access
    Authors
    Zhang, Song
    Ferrie, Stuart
    Lyu, Xin
    Xia, Y.
    Darwish, Nadim
    Wang, Z.
    Ciampi, Simone
    Date
    2021
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Zhang, S. and Ferrie, S. and Lyu, X. and Xia, Y. and Darwish, N. and Wang, Z. and Ciampi, S. 2021. Absence of a Relationship between Surface Conductivity and Electrochemical Rates: Redox-Active Monolayers on Si(211), Si(111), and Si(110). Journal of Physical Chemistry C. 125 (33): pp. 18197-18203.
    Source Title
    Journal of Physical Chemistry C
    DOI
    10.1021/acs.jpcc.1c05023
    ISSN
    1932-7447
    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
    Remarks

    This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry C, copyright © American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.1c05023.

    URI
    http://hdl.handle.net/20.500.11937/90473
    Collection
    • Curtin Research Publications
    Abstract

    Optimizing the kinetics of an electrode reaction is central to the design of devices whose function spans from sensing to energy conversion. Electrode kinetics depends strongly on electrode surface properties, but the search for optimal materials is often a trial-and-error process. Recent research has revealed a pronounced facet-dependent electrical conductivity for silicon, implicitly suggesting that rarely used crystallographic cuts of this technologically relevant material had been entirely overlooked for the fabrication of electrodes. By first protecting silicon from anodic decomposition through Si-C-bound organic monolayers, conductive atomic force microscopy demonstrates that conductivity decreases in the order (211) ≫ (110) > (111). However, charge-transfer rates for a model electrochemical reaction are similar on all these crystal orientations. These findings reveal the absence of a relationship between surface conductivity and kinetics of a surface-confined redox reaction and expand the range of silicon crystallographic orientations viable as electrode materials.

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