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Journal of Nanotechnology
Volume 2011, Article ID 506862, 6 pages
Research Article

Bimetallic Pt-Ru Nanoparticle Catalyst for Hydrogen Peroxide Detection

1Department of Chemical Engineering, Case Western Reserve University, Cleveland, OH 44106, USA
2Department of Chemistry, Shanghai University, Shanghai 200444, China
3Department of Material Sciences and Engineering, Case Western Reserve University, Cleveland, OH 44106, USA

Received 10 June 2011; Revised 3 August 2011; Accepted 4 August 2011

Academic Editor: Charles M. Lukehart

Copyright © 2011 Metini Janyasupab et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A bimetallic Pt-Ru nanoparticle catalyst was prepared and characterized for the enhancement of hydrogen peroxide (H2O2) detection in biosensing applications. The particles were synthesized via sodium borohydride reduction, with low heat treatment, and characterized by TEM and HRTEM. The chemical composition analyses were performed by EDX. The bimetallic particle diameters ranged from 2 to 12 nm, with an average of 4.5 nm. The Pt-Ru catalyst exhibited an improved performance at low overpotential (+0.2 V versus Ag/AgCl reference electrode) in H2O2 detection, suggesting a sensitivity value of 78.95 μA⋅mM-1 (or 402.1 μA⋅mM-1⋅cm-2) which was 30% higher than that for the single Pt catalyst. The major contribution of this enhancement comes from the stronger oxygen adsorption on Ru metal. The Pt-Ru catalyst also showed a more stable signal at the high overpotential (+0.4 V versus Ag/AgCl), providing better accuracy in the detection of H2O2.