Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 190, Issue -, Pages 55-60Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.08.022
Keywords
Hydrogen peroxide oxidation reaction; Bimetallic nanocatalysts; Unfilled d-states; Electrocatalytic activity; Platinum
Funding
- National Science Council (NSC)
- National Synchrotron Radiation Research Center (NSRRC)
- National Taiwan University of Science and Technology (NTUST)
- Electronics Design Center of Case Western Reserve University (CWRU)
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Carbon supported platinum-iridium bimetallic nanoparticles (PtIr/C) for the electrochemical sensing of hydrogen peroxide (H2O2) were developed. Both the cyclic voltammogram (CV) and the amperometric response indicated that PtIr/C possesses a higher oxidation current than either Pt/C or Ir/C over the detection range 0-10 mM at 0.25 V (vs. SCE). The addition of Ir appears to facilitate oxidation kinetics and decrease the competitive adsorption of dioxygen and oxygenated intermediates. These changes were investigated by electrochemical measurements and X-ray absorption near edge spectroscopy (XANES). This study demonstrated that the PtIr/C provide a stable platform for electrochemical sensing of H2O2-derivated biospecies without enzymes and redox mediators. (C) 2013 Elsevier B.V. All rights reserved.
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