title: Sol-gel route to zirconia-Pt-nanoelectrode arrays 8 nm in radius: their geometrical impact in mass transport.
abstract: The fabrication of advanced nanoelectrode arrays and their electrochemical characterization are presented. These nanoelectrode arrays are constituted of nanoperforations of 8 nm in radius leading to platinum and protected by an inorganic matrix made of crystalline zirconia. These nanoelectrodes arrays provide a ceramic support with a high thermal and chemical stability. These devices present a well characterized structure with a control of size, shape, and spacing of the nanoelectrodes, allowing studying in depth both the mass transport and the charge transfer properties in the nanometer range. The radial diffusion occurs when the experimental scan rate is superior to a theoretical scan rate estimated from the model proposed by Amatore and colleagues. The coupling between electrochemical analysis and nanoscale structural characterizations successfully demonstrates that the theory defined for microelectrode arrays can be directly transposed for well-defined metal-ceramic nanocomposite nanoelectrodes.
authors.affiliation: Laboratoire de Chimie de la Matière Condensée de Paris, UPMC-Paris 06, CNRS-UMR 7574, Collège de France, 11 Place Marcelin Berthelot, 75005 Paris, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Fontaine
authors.forename: Christel
authors.initials: C
authors.lastname: Laberty-Robert
authors.forename: Clément
authors.initials: C
authors.lastname: Sanchez
mesh_terms: D004566:Electrodes; D044367:Phase Transition; D010984:Platinum; D015040:Zirconium
chemical_list: D010984:Platinum; D015040:Zirconium; C028541:zirconium oxide