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Aligned Pt-diamond core-shell nanowires for electrochemical catalysis

: Gao, F.; Thomann, R.; Nebel, C.E.


Electrochemistry communications 50 (2015), pp.32-35
ISSN: 1388-2481
European Commission EC
FP7; 309143; NEST
Journal Article
Fraunhofer IAF ()
diamond nanowires; platinum catalyst; core-shell structure; high surface area; high stability

Heavily boron-doped diamond electrode has been applied as a robust substrate for Pt based catalyst. However, by simply combine planar electrode the effective surface area of the catalyst is limited. In this article we for the first time prepared vertically aligned Pt-diamond core-shell nanowires electrode in a convenient and scalable method (up to 6-inch wafer size). The diamond nanowires are first fabricated with reactive ion etching with metal nanoparticles as etching masks. The following Pt deposition was achieved by DC sputtering. Different amount of Pt was coated on to the nanowires and the morphology of the core-shell wires is characterized by SEM and TEM. The catalytic oxygen/hydrogen adsorption/desorption response are characterized by cyclic voltammetry. The results show that the active Pt surface area is 23 times higher than a planar Pt electrode, and 4.3 times higher than previously reported on Pt nanoparticles on diamond by electro-deposition. Moreover, this highly active surface is stable even after 1000 full surface oxidation and reduction cycles.