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Glancing Angle Deposited Platinum Nanorod Arrays for Oxygen Reduction Reaction

Published online by Cambridge University Press:  08 March 2011

Wisam J. Khudhayer ,
Nancy Kariuki ,
Deborah Myers ,
Ali Shaikh  and
Tansel Karabacak
Wisam J. Khudhayer
Affiliation:
Department of Applied Science, Engineering Science and Systems, University of Arkansas at Little Rock, AR, 72204, USA
Nancy Kariuki
Affiliation:
Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439-4837, USA
Deborah Myers
Affiliation:
Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439-4837, USA
Ali Shaikh
Affiliation:
Department of Chemistry, University of Arkansas at Little Rock, AR, 72204, USA
Tansel Karabacak
Affiliation:
Department of Applied Science, University of Arkansas at Little Rock, AR, 72204, USA
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Abstract

In this work, we investigated the electrocatalytic oxygen reduction reaction (ORR) activity of vertically aligned, single-layer, carbon-free, and single crystal Pt nanorod arrays utilizing cyclic voltammetry (CV) and rotating-disk electrode (RDE) techniques. A glancing angle deposition (GLAD) technique was used to fabricate 200 nm long Pt nanorods, which corresponds to Pt loading of 0.16 mg/cm2, on glassy carbon (GC) electrode at a glancing angle of 85° as measured from the substrate normal. An electrode comprised of conventional carbon-supported Pt nanoparticles (Pt/C) was also prepared for comparison with the electrocatalytic ORR activity and stability of Pt nanorods. CV results showed that the Pt nanorod electrocatalyst exhibits a more positive oxide reduction peak potential compared to Pt/C, indicating that GLAD Pt nanorods are less oxophilic. In addition, a series of CV cycles in acidic electrolyte revealed that Pt nanorods are significantly more stable against electrochemically-active surface area loss than Pt/C. Moreover, room temperature RDE results demonstrated that GLAD Pt nanorods exhibit higher area-specific ORR activity than Pt/C. The enhanced electrocatalytic ORR activity of Pt nanorods is attributed to their larger crystallite size, single-crystal property, and the dominance of (110) crystal planes on the large surface area nanorods sidewalls, which has been found to be the most active plane for ORR. However, the Pt nanorods showed lower mass specific activity than the Pt/C electrocatalyst due to the large diameter of the Pt nanorods.

Keywords

sputteringenergy generationnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1311: Symposium GG – Next-Generation Fuel Cells—New Materials and Concepts , 2011 , mrsf10-1311-gg06-09
Copyright
Copyright © Materials Research Society 2011

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