Carbon segregation-induced highly metallic Ni nanoparticles for electrocatalytic oxidation of hydrazine in alkaline media

Tae Yeol Jeon, Masahiro Watanabe, Kenji Miyatake

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

The important roles of Ni in electrocatalytic reactions such as hydrazine oxidation are limited largely by high oxidation states because of its intrinsically high oxophilicity. Here, we report the synthesis and properties of highly metallic Ni nanoparticles (NPs) on carbon black supports. We discovered that the heat treatment of as-prepared Ni NPs with an average particle size of 5.8 nm produced highly metallic Ni NPs covered with thin carbon shells, with negligible particle coarsening. The carbon shells were formed by the segregation of carbons in the Ni lattice to the surface of the Ni NPs, leaving highly metallic Ni NPs. X-ray photoelectron spectroscopic analyses revealed that the atomic ratio of metallic Ni increased from 19.2 to 71.7% as a result of the heat treatment. The NPs exhibited higher electrocatalytic activities toward the hydrazine oxidation reaction in alkaline solution, as compared to those of the as-prepared Ni NPs and commercial Ni powders.

Original languageEnglish
Pages (from-to)18445-18449
Number of pages5
JournalACS Applied Materials and Interfaces
Volume6
Issue number21
DOIs
Publication statusPublished - 2014 Nov 12
Externally publishedYes

Keywords

  • carbon segregation
  • electrocatalyst
  • hydrazine oxidation
  • nickel nanoparticle

ASJC Scopus subject areas

  • Materials Science(all)

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