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dc.contributor.authorYang, Y.
dc.contributor.authorCiampi, Simone
dc.contributor.authorChoudhury, M.
dc.contributor.authorGooding, J.
dc.date.accessioned2017-01-30T12:45:12Z
dc.date.available2017-01-30T12:45:12Z
dc.date.created2016-07-24T19:30:45Z
dc.date.issued2016
dc.identifier.citationYang, Y. and Ciampi, S. and Choudhury, M. and Gooding, J. 2016. Light Activated Electrochemistry: Light Intensity and pH Dependence on Electrochemical Performance of Anthraquinone Derivatized Silicon. Journal of Physical Chemistry C. 120 (5): pp. 2874-2882.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/24840
dc.identifier.doi10.1021/acs.jpcc.5b12097
dc.description.abstract

We seek to understand how the thermodynamics and kinetics of anthraquinone-containing self-assembled monolayer on silicon electrodes are affected by two key experimental variables: the intensity of the light assisting the anthraquinone/anthrahydroquinone redox process and the local solution environment. The substrates are chemically passivated poorly doped p-type silicon electrodes. The study presents a strategy for the selective modulation of either the anodic or the cathodic process occurring at the interface. Cyclic voltammetry studies showed that unlike for a proton-coupled electron transfer process performed at metallic electrodes, for the redox reaction of the anthraquinone unit on a silicon electrode it becomes possible to (i) selectively facilitate only the oxidation process by increasing the electrolyte pH or (ii) at a given pH value to increase the illumination intensity to anodically shift the onset of the reduction step only but leave the oxidation process thermodynamic unchanged. A model concerning the proton coupled electron transfer mechanism was proposed, where the electron transfer is the rate-determining step for the anthraquinone reduction while a deprotonation step is the rate-determining event for the anthrahydroquinone oxidation on poorly doped illuminated p-type silicon.

dc.publisherAmerican Chemical Society
dc.titleLight Activated Electrochemistry: Light Intensity and pH Dependence on Electrochemical Performance of Anthraquinone Derivatized Silicon
dc.typeJournal Article
dcterms.source.volume120
dcterms.source.number5
dcterms.source.startPage2874
dcterms.source.endPage2882
dcterms.source.issn1932-7447
dcterms.source.titleJournal of Physical Chemistry C
curtin.note

This open access article is distributed under the Creative Commons license http://creativecommons.org/licenses/by-nc/4.0/

curtin.departmentNanochemistry Research Institute
curtin.accessStatusOpen access


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