Surface Composition Effects in Electrocatalysis:  Kinetics of Oxygen Reduction on Well-Defined Pt 3 Ni and Pt 3 Co Alloy Surfaces

Stamenković, Vojislav R.; Schmidt, Thomas J.; Ross, P.N.; Marković, Nenad M.

doi:10.1021/jp021182h

articleThe Journal of Physical Chemistry BOct 26, 2002GREEN OA

Surface Composition Effects in Electrocatalysis: Kinetics of Oxygen Reduction on Well-Defined Pt 3 Ni and Pt 3 Co Alloy Surfaces

VRVojislav R. Stamenković TJThomas J. Schmidt PRP.N. Ross NMNenad M. Marković

Lawrence Berkeley National Laboratory

Indexed incrossref

Abstract

The oxygen reduction reaction (ORR) has been studied on polycrystalline Pt3Ni and Pt3Co alloys in acid electrolytes using the rotating ring disk electrode (RRDE) method. Preparation and characterization of alloy surfaces were performed in ultrahigh vacuum (UHV). Clearly defined surface composition was determined via low-energy ion-scattering (LEIS) spectroscopy. Polycrystalline bulk alloys of Pt3Ni and Pt3Co were prepared in UHV having two different surface compositions: one with 75% Pt and the other with 100% Pt. The latter we call a “Pt-skin” structure and is produced by an exchange of Pt and Co in the first two layers. The base voltammetry in 0.1 M HClO4 solution of the 75% Pt alloy surface indicated a…

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Topics

Keywords

Rotating ring-disk electrode
Alloy
Crystallite
Materials science
Electrocatalyst
Electrolyte
Low-energy ion scattering
Analytical Chemistry (journal)

UN Sustainable Development Goals

Affordable and clean energy

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