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    Single-Electrode Electrochemistry: Chemically Engineering Surface Adhesion and Hardness to Maximize Redox Work Extracted from Tribocharged Silicon

    79595.pdf (1.466Mb)
    Access Status
    Open access
    Authors
    Zhang, Jinyang
    Ferrie, Stuart
    Zhang, Song
    Vogel, Yan
    Peiris, Chandramalika
    Darwish, Nadim
    Ciampi, Simone
    Date
    2019
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Zhang, J. and Ferrie, S. and Zhang, S. and Vogel, Y.B. and Peiris, C.R. and Darwish, N. and Ciampi, S. 2019. Single-Electrode Electrochemistry: Chemically Engineering Surface Adhesion and Hardness to Maximize Redox Work Extracted from Tribocharged Silicon. ACS Applied Nano Materials. 2 (11): pp. 7230-7236.
    Source Title
    ACS Applied Nano Materials
    DOI
    10.1021/acsanm.9b01726
    ISSN
    2574-0970
    Faculty
    Faculty of Science and Engineering
    School
    School of Molecular and Life Sciences (MLS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DE160100732
    http://purl.org/au-research/grants/arc/DE160101101
    http://purl.org/au-research/grants/arc/DP190100735
    URI
    http://hdl.handle.net/20.500.11937/79495
    Collection
    • Curtin Research Publications
    Abstract

    © 2019 American Chemical Society.

    Recent research has demonstrated that heterogeneous charge-transfer reactions are not restricted to conductors and that electrochemical reactions can occur on the surface of statically charged insulators. However, the exact mechanism by which insulators gain and lose electrical charges remains controversial. Herein we have studied quantitatively the reduction of silver ions on intrinsic amorphous silicon surfaces that are statically charged by contact against plastic polymers. We have quantified the magnitude of the redox work done by the tribocharged silicon surface as a function of its adhesion and hardness, with these two variables being tuned using covalent Si - C monolayer chemistries. We observed that metallic particles grow preferentially over surfaces that are relatively soft (low DMT modulus) and highly adhesive, hence indirectly proving that the triboelectrification of an insulator-insulator dynamic contact is caused by the exchange of ionic fragments, rather than by the movement of free electrons. This work clarifies the origin of triboelectricity, devises a surface-chemistry method to maximize tribocharging with immediate scope in single-electrode electrochemistry, and describes a concept potentially suitable for the mask-free and bias-free patterning of metal nanoparticles on photoconductors.

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