title: Single Nanoparticle Voltammetry: Contact Modulation of the Mediated Current.
abstract: The cyclic voltammetric responses of individual palladium-coated carbon nanotubes are reported. Upon impact-from the solution phase-with 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.
authors.affiliation: Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, Oxford, OX1 3QZ, UK.
authors.forename: Xiuting
authors.initials: X
authors.lastname: Li
authors.affiliation: Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, Oxford, OX1 3QZ, UK.
authors.forename: Christopher
authors.initials: C
authors.lastname: Batchelor-McAuley
authors.affiliation: Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, Oxford, OX1 3QZ, UK.
authors.forename: Samuel A I
authors.initials: SA
authors.lastname: Whitby
authors.affiliation: Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, Oxford, OX1 3QZ, UK.|Micro-/Nano-Electrochemistry, Center for Electrochemical Sciences (CES), Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, 44780, Bochum, Germany.
authors.forename: Kristina
authors.initials: K
authors.lastname: Tschulik
authors.affiliation: Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, 2103 Pingliang Road, Shanghai, 200090, P.R. China.
authors.forename: Lidong
authors.initials: L
authors.lastname: Shao
authors.affiliation: Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, Oxford, OX1 3QZ, UK. richard.compton@chem.ox.ac.uk.
authors.forename: Richard G
authors.initials: RG
authors.lastname: Compton
keywords: carbon nanotubes; catalysis; electrochemistry; hydrogen-oxidation reaction; palladium