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Structure/Processing/Properties Relationships in Nanoporous Nanoparticles As Applied to Catalysis of the Cathodic Oxygen Reduction Reaction

Snyder, Joshua, McCue, Ian, Livi, Ken, Erlebacher, Jonah·2012·Journal of the American Chemical Society

DOI 10.1021/ja3019498

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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 ∼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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See all 285

Authors: Snyder, J., McCue, I., Livi, K., & Erlebacher, J.
Venue: Journal of the American Chemical Society
Publisher: American Chemical Society (ACS)
Published: 2012-05-09
Volume: 134
Issue: 20
Pages: 8633-8645
ISSN: 0002-7863 (ISSN-L)
1520-5126
DOI: 10.1021/ja3019498
OpenAlex: W2326587274
Cited by: 285
References: 84
FWCI: 11.66
Type: journal article
Language: en
Open access: closed

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Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.

Structure/Processing/Properties Relationships in Nanoporous Nanoparticles As Applied to Catalysis of the Cathodic Oxygen Reduction Reaction

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