Preparation, structure, and stability of Pt and Pd monolayer modified Pd and Pt electrocatalysts.
A controlled surface reaction technique has been successfully employed to prepare a series of Pt modified Pd/C (Pt/Pd/C) and Pd modified Pt/C (Pd/Pt/C) catalysts. The resulting catalyst materials were characterised by TEM, XRD, electrochemistry, and EXAFS techniques. In the case of the Pd/Pt/C carbon catalysts, core-shell structural arrangements were found, with a 0.04 A contraction of the Pd-Pd bond distance for the 1 Pd/Pt/C being observed. A greater degree of alloying was found for the Pt/Pd/C catalysts where the surface had a mixed composition with a large proportion of the Pt in the interior of the nanoparticle. However, strong Pt characteristics were exhibited in the voltammetry of Pt/Pd/C catalysts, most notably a large increase in the stability with respect to the electrochemical environment compared to Pd alone.
School of Chemistry, University of Southampton, Highfield, Southampton, UK SO17 1BJ.
P P
PP
Wells
E M
EM
Crabb
C R
CR
King
R
R
Wiltshire
B
B
Billsborrow
D
D
Thompsett
A E
AE
Russell