Shape-dependent activity of platinum array catalyst.
We produced millions of morphologically identical platinum catalyst nanoparticles in the form of ordered arrays epitaxially grown on (111), (100), and (110) strontium titanate substrates using electron beam lithography. The ability to design, produce, and characterize the catalyst nanoparticles allowed us to relate microscopic morphologies with macroscopic catalytic reactivities. We evaluated the activity of three different arrays containing different ratios of (111) and (100) facets for an oxygen-reduction reaction, the most important reaction for fuel cells. Increased catalytic activity of the arrays points to a possible cooperative interplay between facets with different affinities to oxygen. We suggest that the surface area of (100) facets is one of the key factors governing catalyst performance in the electrochemical reduction of oxygen molecules.
Komanicky
Vladimir
V
Safarik University, Faculty of Sciences and, Institute of Experimental Physics, SAS, Kosice 04154, Slovakia. vladimir.komanicky@upjs.sk
Iddir
Hakim
H
Chang
Kee-Chul
KC
Menzel
Andreas
A
Karapetrov
Goran
G
Hennessy
Daniel
D
Zapol
Peter
P
You
Hoydoo
H