4.8 Article

Single Nanoparticle Voltammetry: Contact Modulation of the Mediated Current

Journal

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 13, Pages 4296-4299

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201509017

Keywords

carbon nanotubes; catalysis; electrochemistry; hydrogen-oxidation reaction; palladium

Funding

  1. European Research Council (ERC) under the European Union [320403]
  2. China Scholarship Council
  3. Cluster of Excellence RESOLV - Deutsche Forschungsgemeinschaft [EXC 1069]

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The cyclic voltammetric responses of individual palladium-coated carbon nanotubes are reported. Upon impactfrom the solution phasewith the electrified interface, the nanoparticles act as individual nanoelectrodes catalyzing the hydrogen-oxidation reaction. At high overpotentials the current is shown to reach a quasi-steady-state diffusion limit, allowing determination of the tube length. The electrochemical response of the individual nanotubes also reveals the system to be modulated by the electrical contact between the electrode and carbon nanotube. This modulation presents itself as fluctuations in the recorded Faradaic current.

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