4 Catalyst Materials for Oxygen Reduction Reaction
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of nanocrystals composed of special crystal planes. For example, although single
crystal polyhedrons consisting of {111} crystal planes can only be octahedron, tetrahedron, and truncated tetrahedron, a large number of other polyhedrons consisting
of {111} crystal planes and twin boundary are synthesized.
Wang et al. [180] reduced platinum acetylacetone in oleylamine and oleic acid
solution at 200 °C in the presence of a small amount of Fe(CO) 5 , and Pt nanocubes
with a size of 8 nm are obtained, as shown in Fig. 4.16. The presence of a small
amount of Fe(CO) 5 is crucial for the preparation of Pt nanocubes. In the absence
of Fe(CO) 5 , only spherical Pt nanoparticles can be obtained. In the range of 0.9 to
Fig. 4.16 a TEM images of Pt nanocube, b TEM images of Pt nanocube, c Comparison of ORR
specific activity of Pt nanocube and Pt/C catalyst in 0.5 M H 2 SO 4 . [180] Reprinted with permission.
[180] Copyright (2007) American Chemical Society
109
of nanocrystals composed of special crystal planes. For example, although single
crystal polyhedrons consisting of {111} crystal planes can only be octahedron, tetrahedron, and truncated tetrahedron, a large number of other polyhedrons consisting
of {111} crystal planes and twin boundary are synthesized.
Wang et al. [180] reduced platinum acetylacetone in oleylamine and oleic acid
solution at 200 °C in the presence of a small amount of Fe(CO) 5 , and Pt nanocubes
with a size of 8 nm are obtained, as shown in Fig. 4.16. The presence of a small
amount of Fe(CO) 5 is crucial for the preparation of Pt nanocubes. In the absence
of Fe(CO) 5 , only spherical Pt nanoparticles can be obtained. In the range of 0.9 to
Fig. 4.16 a TEM images of Pt nanocube, b TEM images of Pt nanocube, c Comparison of ORR
specific activity of Pt nanocube and Pt/C catalyst in 0.5 M H 2 SO 4 . [180] Reprinted with permission.
[180] Copyright (2007) American Chemical Society