Journal article
Structure/Processing/Properties Relationships in Nanoporous Nanoparticles As Applied to Catalysis of the Cathodic Oxygen Reduction Reaction
Journal of the American Chemical Society, v 134(20), pp 8633-8645
23 May 2012
PMID: 22533802
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
We present a comprehensive experimental study of the formation and activity of dealloyed nanoporous Ni/Pt alloy nanoparticles for the cathodic oxygen reduction reaction. By addressing the kinetics of nucleation during solvothermal synthesis we developed a method to control the size and composition of Ni/Pt alloy nanoparticles over a broad range while maintaining an adequate size distribution. Electrochemical dealloying of these size-controlled nanoparticles was used to explore conditions in which hierarchical nanoporosity within nanoparticles can evolve. Our results show that in order to evolve fully formed porosity, particles must have a minimum diameter of similar to 15 nm, a result consistent with the surface kinetic processes occurring during dealloying. Nanoporous nanoparticles possess ligaments and voids with diameters of approximately 2 nm, high surface area/mass ratios usually associated with much smaller particles, and a composition consistent with a Pt-skeleton covering a Ni/Pt alloy core. Electrochemical measurements show that the mass activity for the oxygen reduction reaction using carbon-supported nanoporous Ni/Pt nanoparticles is nearly four times that of commercial Pt/C catalyst and even exceeds that of comparable nonporous Pt-skeleton Ni/Pt alloy nanoparticles.
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Details
- Title
- Structure/Processing/Properties Relationships in Nanoporous Nanoparticles As Applied to Catalysis of the Cathodic Oxygen Reduction Reaction
- Creators
- Joshua Snyder - Johns Hopkins UniversityIan McCue - Johns Hopkins UniversityKen Livi - Johns Hopkins Univ, Dept Earth & Planetary Sci, Baltimore, MD 21218 USAJonah Erlebacher - Johns Hopkins University
- Publication Details
- Journal of the American Chemical Society, v 134(20), pp 8633-8645
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 13
- Grant note
- DE-FG02-05ER15727 / U.S. Department of Energy, Office of Basic Energy Sciences; United States Department of Energy (DOE)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000304285700061
- Scopus ID
- 2-s2.0-84861386597
- Other Identifier
- 991019296563704721
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- Web of Science research areas
- Chemistry, Multidisciplinary