posted on 2023-11-10, 23:03authored byMasanao Ishijima, Naoto Todoroki, Jhon L. Cuya Huaman, Yuto Tanaka, Jeyadevan Balachandran
Atomic arrangement in Cu–Pd alloy nanoparticles
(NPs) has
been reported to influence the catalytic activity, but they have yet
to be studied in detail. Unlike previous studies, where the B2 structure
Cu–Pd NPs are obtained by heat treating the A1 structure, this
study reports the one-pot direct syntheses of A1- and B2-structured
Cu–Pd NPs using an alcohol reduction method. The alcohol reduction
technique facilitates the kinetic control of the reduction reaction
by selecting the appropriate alcohol type and complexing agent to
delay the reduction of easily reducible metallic elements to realize
control over the reduction kinetics for coreduction. Different formation
mechanisms for A1- and B2-structured CuPd NPs were confirmed by in
situ ultraviolet–visible (UV–vis) measurements and morphological
and structural analyses of samples withdrawn during the reaction.
Finally, the direct formation of single-phase B2-structured Cu–Pd
NPs with an average diameter of 18.6 ± 7.6 nm was realized using
tri-n-octyl phosphine as a complexing agent. The
noticeable crystal structural dependence of the electrocatalytic CO2 reduction reaction properties of A1- and B2-structured CuPd
NPs was demonstrated.