Bipolar nanoimpact transients: Controlling the redox potential of nanoparticles in solution

In the bulk solution phase the electrical potential of a single metallic nanoparticle can be controlled by its local chemical environment. In this work it is demonstrated how this nanoparticle “redox” potential determines—in the case of platinum—the surface functionality of the nanomaterial. Specifi...

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Автори: Markham, J, Young, NP, Batchelor-McAuley, C, Compton, RG
Формат: Journal article
Мова:English
Опубліковано: American Chemical Society 2020
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author Markham, J
Young, NP
Batchelor-McAuley, C
Compton, RG
author_facet Markham, J
Young, NP
Batchelor-McAuley, C
Compton, RG
author_sort Markham, J
collection OXFORD
description In the bulk solution phase the electrical potential of a single metallic nanoparticle can be controlled by its local chemical environment. In this work it is demonstrated how this nanoparticle “redox” potential determines—in the case of platinum—the surface functionality of the nanomaterial. Specifically we report that in the aqueous solution phase the surface adsorption of hydrogen onto the platinum interface is inhibited by the addition of iodine to the solution. The iodine does not competitively inhibit the hydrogen deposition, but rather alters the nanoparticle potential, making it comparatively oxidizing. This work evidences this behavior through single nanoparticle electrochemistry and supports these results with characterization using ex-situ energy dispersive X-ray analysis. We show how the electrochemical response depends on the chemical “redox” state of the nanoparticle in the solution phase; this leads to the first reported example of a bipolar single nanoparticle event characterized by the single nanoparticle impact current transient initially being reductive before switching after ca. 50 ms to being oxidative.
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spelling oxford-uuid:caad69c3-40b6-45d4-a9c3-004a32e68b172022-03-27T07:09:15ZBipolar nanoimpact transients: Controlling the redox potential of nanoparticles in solutionJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:caad69c3-40b6-45d4-a9c3-004a32e68b17EnglishSymplectic ElementsAmerican Chemical Society2020Markham, J Young, NPBatchelor-McAuley, CCompton, RGIn the bulk solution phase the electrical potential of a single metallic nanoparticle can be controlled by its local chemical environment. In this work it is demonstrated how this nanoparticle “redox” potential determines—in the case of platinum—the surface functionality of the nanomaterial. Specifically we report that in the aqueous solution phase the surface adsorption of hydrogen onto the platinum interface is inhibited by the addition of iodine to the solution. The iodine does not competitively inhibit the hydrogen deposition, but rather alters the nanoparticle potential, making it comparatively oxidizing. This work evidences this behavior through single nanoparticle electrochemistry and supports these results with characterization using ex-situ energy dispersive X-ray analysis. We show how the electrochemical response depends on the chemical “redox” state of the nanoparticle in the solution phase; this leads to the first reported example of a bipolar single nanoparticle event characterized by the single nanoparticle impact current transient initially being reductive before switching after ca. 50 ms to being oxidative.
spellingShingle Markham, J
Young, NP
Batchelor-McAuley, C
Compton, RG
Bipolar nanoimpact transients: Controlling the redox potential of nanoparticles in solution
title Bipolar nanoimpact transients: Controlling the redox potential of nanoparticles in solution
title_full Bipolar nanoimpact transients: Controlling the redox potential of nanoparticles in solution
title_fullStr Bipolar nanoimpact transients: Controlling the redox potential of nanoparticles in solution
title_full_unstemmed Bipolar nanoimpact transients: Controlling the redox potential of nanoparticles in solution
title_short Bipolar nanoimpact transients: Controlling the redox potential of nanoparticles in solution
title_sort bipolar nanoimpact transients controlling the redox potential of nanoparticles in solution
work_keys_str_mv AT markhamj bipolarnanoimpacttransientscontrollingtheredoxpotentialofnanoparticlesinsolution
AT youngnp bipolarnanoimpacttransientscontrollingtheredoxpotentialofnanoparticlesinsolution
AT batchelormcauleyc bipolarnanoimpacttransientscontrollingtheredoxpotentialofnanoparticlesinsolution
AT comptonrg bipolarnanoimpacttransientscontrollingtheredoxpotentialofnanoparticlesinsolution