Electrocatalysis and transport effects on nanostructured Pt/GC electrodes
Artikel i vetenskaplig tidskrift, 2010

The role and contribution of transport processes in electrocatalytic reactions was investigated in model studies of the oxidation of CO (single-product reaction) and formaldehyde (dual-product reaction), using nanostructured Pt/glassy carbon electrodes with variable Pt loading and defined reactant transport conditions. Nanostructured electrodes with monodispersed, uniformly distributed Pt nanostructures (100-140 nm diameter) supported on planar glassy carbon (GC) electrodes with different densities were prepared by Colloidal Lithography (CL) or Hole-Mask Colloidal Lithography (HCL). Transport effects were evaluated by varying the density of the nanostructures and the electrolyte flow. The resulting changes in the transport limited reaction current (CO oxidation - transition from planar to spherical diffusion with de creasing Pt nanostructure density) and in the distribution of the reaction products HCOOH and CO 2 (HCHO oxidation), which is probed by differential electrochemical mass spectrometry (DEMS), are discussed focusing on transport effects. The increasing amount of CO 2 with decreasing space velocity (higher nanostructure density, lower electrolyte flow) is explained by increasing re-adsorption and further reaction of desorbing reaction intermediates. © 2009 Elsevier B.V.

Nanostructuring

Electrocatalysis

Formaldehyde oxidation

Hole-Mask Colloidal Lithography

Colloidal Lithography

CO oxidation

Transport effects

Model catalyst

Författare

R. W. Lindstrom

Universität Ulm

Y.E. Seidel

Universität Ulm

Z. Jusys

Universität Ulm

Marie Gustavsson

Kompetenscentrum katalys (KCK)

Chalmers, Teknisk fysik, Kemisk fysik

Björn Wickman

Kompetenscentrum katalys (KCK)

Chalmers, Teknisk fysik, Kemisk fysik

Bengt Herbert Kasemo

Chalmers, Teknisk fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

R.J. Behm

Universität Ulm

Journal of Electroanalytical Chemistry

0022-0728 (ISSN)

Vol. 644 90-102

Ämneskategorier

Atom- och molekylfysik och optik

DOI

10.1016/j.jelechem.2009.04.034