Abstract
Formation of Pt+Cu and Pd+Cu alloy particles in acidic solutions at deposition electrode potentials which were located in the underpotential deposition region (upd) of Cu2+ ion was investigated by transmission electron microscopy (TEM). It was found that the behavior of the fraction of Cu in the alloy particles is similar to that of the Au–Cu alloy particles, that is, the fraction of Cu is independent of concentration of Cu2+ ion in solution but is dependent of deposition potential in the upd region of Cu2+ ion. This correlation can be described by an experimental formula. Unlike the case of the Au+Cu alloy particles, we did not find the multiply twinned particles (MTPs) of Pt+Cu alloy particles. The MTPs of Pd+Cu alloy particles were observed. However, these MTPs were not stable and changed to polycrystalline material quickly during the observation by TEM. Ag+Cu alloy particles were not formed in the upd region of Cu2+ ion.
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