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TEM and Electron Tomography Imaging of Pt Particles Dispersed on Carbon Nanospheres

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Abstract:

Three-dimensional (3D) observation of Pt nanoparticles on the surface of carbon nanoparticles, one of the important catalyst systems for energy storage such as fuel cells, was carried out by using an electron tomography system attached to a transmission electron microscope (TEM). In the Pt/carbon sample preparation process, pristine and graphitized carbon nanospheres (CNSs, 200 nm average diameter) were immersed into H2PtCl6 solution, followed by a heat-treatment at 493 K. According to the electron tomography technique, we confirmed that crystalline Pt particles (2-3 nm) were homogeneously dispersed on the whole surface of pristine CNSs, while on the graphitized CNSs Pt was aggregated on the ridgeline of the polyhedronized CNS particles or on the connecting surface between two CNS particles. Dependence of Pt dispersion as shown was discussed with the distribution of surface defects of CNS particles.

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Journal of Nano Research Vol. 11 View Preview

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Periodical:

Journal of Nano Research (Volume 11)

Pages:

119-124

DOI:

https://doi.org/10.4028/www.scientific.net/JNanoR.11.119

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Online since:

May 2010

Authors:

Noriko Yoshizawa, Yasushi Soneda, Hiroaki Hatori, Hitoshi Ue, Takeshi Abe

Keywords:

Carbon Nanoparticles, Dispersion, Electron Tomography, Pt, Surface Defect, TEM

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© 2010 Trans Tech Publications Ltd. All Rights Reserved

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