Cathodic Corrosion of a Bulk Wire to Nonaggregated Functional Nanocrystals and Nanoalloys

Jicheng Feng, Dong Chen, Ahmad S. Sediq, Stefan Romeijn, Frans D. Tichelaar, Wim Jiskoot, Jun Yang, Marc T.M. Koper

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)
19 Downloads (Pure)

Abstract

A key enabling step in leveraging the properties of nanoparticles (NPs) is to explore new, simple, controllable, and scalable nanotechnologies for their syntheses. Among "wet" methods, cathodic corrosion has been used to synthesize catalytic aggregates with some control over their size and preferential faceting. Here, we report on a modification of the cathodic corrosion method for producing a range of nonaggregated nanocrystals (Pt, Pd, Au, Ag, Cu, Rh, Ir, and Ni) and nanoalloys (Pt50Au50, Pd50Au50, and AgxAu100-x) with potential for scaling up the production rate. The method employs poly(vinylpyrrolidone) (PVP) as a stabilizer in an electrolyte solution containing nonreducible cations (Na+, Ca2+), and cathodic corrosion of the corresponding wires takes place in the electrolyte under ultrasonication. The ultrasonication not only promotes particle-PVP interactions (enhancing NP dispersion and diluting locally high NP concentration) but also increases the production rate by a factor of ca. 5. Further increase in the production rate can be achieved through parallelization of electrodes to construct comb electrodes. With respect to applications, carbon-supported Pt NPs prepared by the new method exhibit catalytic activity and durability for methanol oxidation comparable or better than the commercial benchmark catalyst. A variety of AgxAu100-x nanoalloys are characterized by ultraviolet-visible absorption spectroscopy and high-resolution transmission electron microscopy. The protocol for NP synthesis by cathodic corrosion should be a step toward its further use in academic research as well as in its practical upscaling.

Original languageEnglish
Pages (from-to)9532-9540
JournalACS Applied Materials and Interfaces
Volume10
Issue number11
DOIs
Publication statusPublished - 21 Mar 2018

Keywords

  • alloy nanoparticles
  • Cathodic corrosion
  • comb electrodes
  • electrocatalysis
  • methanol oxidation reaction
  • optical properties

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