Formation of Pt decorated Ni-Pt nanocubes through low temperature atomic diffusion - Time-resolved elemental analysis of nanoparticle formation

A. Nagao, K. Higashimine, J. L. Cuya Huaman, T. Iwamoto, T. Matsumoto, Y. Inoue, S. Maenosono, H. Miyamura, B. Jeyadevan

研究成果: Article査読

20 被引用数 (Scopus)

抄録

The formation process of Pt decorated Ni-Pt nanocubes was investigated by analysing the elemental distribution of Ni and Pt in the particles obtained from time-resolved in situ sampling during the synthesis in the oleylamine-1-heptanol system. The analysis confirmed the formation of Pt(core)-Ni(shell) nanoparticles at the initial stages of the reaction. However, as the reaction time progressed, the Pt atoms at the centre diffused outward and reached the corners and edges of the particle, whose shape changed from nearly spherical at the initial stages of the reaction to a perfect cube at the end of the reaction, forming a Ni rich cube (core)-Pt(cage). The cage obtained by dissolving the Ni rich cube was composed mainly of Pt and the Ni content in the frame was a mere 12%. The catalytic activity of the Pt cage was measured using cyclic voltammetry. The initial measurements suggested that the activity was comparable to some of the commercially available Pt catalysts.

本文言語English
ページ(範囲)9927-9934
ページ数8
ジャーナルNanoscale
7
21
DOI
出版ステータスPublished - 2015 6月 7

ASJC Scopus subject areas

  • 材料科学(全般)

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