Dl. Lu et al., PT-ACID SOLUTION(CU AND PD+CU ALLOY PARTICLES FORMED IN THE UNDERPOTENTIAL DEPOSITION REGION OF CU2+ IN PERCHLORIC), Electrochimica acta, 43(16-17), 1998, pp. 2325-2330
Formation of Pt + Cu and Pd + Cu alloy particles in acidic solutions a
t deposition electrode potentials which were located in the underpoten
tial deposition region (upd) of Cu2+ ion was investigated by transmiss
ion electron microscopy (TEM). It was found that the behavior of the f
raction of Cu in the alloy particles is similar to that of the Au-Cu a
lloy particles, that is, the fraction of Cu is independent of concentr
ation of Cu2+ ion in solution but is dependent of deposition potential
in the upd region of Cu2+ ion. This correlation can be described by a
n experimental formula. Unlike the case of the Au + Cu alloy particles
, we did not find the multiply twinned particles (MTPs) of Pt + Cu all
oy particles. The MTPs of Pd + Cu alloy particles were observed. Howev
er, these MTPs were not stable and changed to polycrystalline material
quickly during the observation by TEM. Ag + Cu alloy particles were n
ot formed in the upd region of Cu2+ ion. (C) 1998 Published by Elsevie
r Science Ltd. All rights reserved.