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Structural Regulation of PdCu2 Nanoparticles and Their Electrocatalytic Performance for Ethanol Oxidation
journal contribution
posted on 2016-11-30, 00:00 authored by Jing Xue, Guangting Han, Wanneng Ye, Yutao Sang, Hongliang Li, Peizhi Guo, X. S. ZhaoTwo types of PdCu2 nanoparticles were prepared through one-pot synthesis and
a two-step reducing process, named as PdCu2-1 and PdCu2-2, respectively. The morphology and structure of as-prepared
samples were investigated by transmission electron microscopy, high-resolution
transmission electron microscopy, X-ray diffraction, X-ray photoelectron
spectroscopy, and inductively coupled plasma-optical emission spectrometry.
Results showed that more Pd atoms were buried in the inside of PdCu2-1, whereas more available Pd sites were distributed on the
surface of PdCu2-2. The electrochemical measurements indicated
that both PdCu2-1 and PdCu2-2 nanoparticles
showed a higher electrocatalytic activity than that for pure Pd nanoparticles.
In particular, PdCu2-2 predictably exhibited a better stability
and durability as well as a lower onset potential and a higher catalytic
current density than that of PdCu2-1 toward ethanol oxidation
in alkaline media. On the basis of these studies, the formation mechanisms
of both the PdCu2 catalysts and the relationship between
their structure and properties were discussed in this paper.